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postgres.c
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1 /*-------------------------------------------------------------------------
2  *
3  * postgres.c
4  * POSTGRES C Backend Interface
5  *
6  * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  *
10  * IDENTIFICATION
11  * src/backend/tcop/postgres.c
12  *
13  * NOTES
14  * this is the "main" module of the postgres backend and
15  * hence the main module of the "traffic cop".
16  *
17  *-------------------------------------------------------------------------
18  */
19 
20 #include "postgres.h"
21 
22 #include <fcntl.h>
23 #include <limits.h>
24 #include <signal.h>
25 #include <unistd.h>
26 #include <sys/socket.h>
27 #ifdef HAVE_SYS_SELECT_H
28 #include <sys/select.h>
29 #endif
30 #ifdef HAVE_SYS_RESOURCE_H
31 #include <sys/time.h>
32 #include <sys/resource.h>
33 #endif
34 
35 #ifndef HAVE_GETRUSAGE
36 #include "rusagestub.h"
37 #endif
38 
39 #include "access/parallel.h"
40 #include "access/printtup.h"
41 #include "access/xact.h"
42 #include "catalog/pg_type.h"
43 #include "commands/async.h"
44 #include "commands/prepare.h"
45 #include "executor/spi.h"
46 #include "jit/jit.h"
47 #include "libpq/libpq.h"
48 #include "libpq/pqformat.h"
49 #include "libpq/pqsignal.h"
50 #include "miscadmin.h"
51 #include "nodes/print.h"
52 #include "optimizer/optimizer.h"
53 #include "pgstat.h"
54 #include "pg_trace.h"
55 #include "parser/analyze.h"
56 #include "parser/parser.h"
57 #include "pg_getopt.h"
58 #include "postmaster/autovacuum.h"
59 #include "postmaster/postmaster.h"
62 #include "replication/slot.h"
63 #include "replication/walsender.h"
64 #include "rewrite/rewriteHandler.h"
65 #include "storage/bufmgr.h"
66 #include "storage/ipc.h"
67 #include "storage/proc.h"
68 #include "storage/procsignal.h"
69 #include "storage/sinval.h"
70 #include "tcop/fastpath.h"
71 #include "tcop/pquery.h"
72 #include "tcop/tcopprot.h"
73 #include "tcop/utility.h"
74 #include "utils/lsyscache.h"
75 #include "utils/memutils.h"
76 #include "utils/ps_status.h"
77 #include "utils/snapmgr.h"
78 #include "utils/timeout.h"
79 #include "utils/timestamp.h"
80 #include "mb/pg_wchar.h"
81 
82 
83 /* ----------------
84  * global variables
85  * ----------------
86  */
87 const char *debug_query_string; /* client-supplied query string */
88 
89 /* Note: whereToSendOutput is initialized for the bootstrap/standalone case */
91 
92 /* flag for logging end of session */
93 bool Log_disconnections = false;
94 
96 
97 /* GUC variable for maximum stack depth (measured in kilobytes) */
98 int max_stack_depth = 100;
99 
100 /* wait N seconds to allow attach from a debugger */
102 
103 
104 
105 /* ----------------
106  * private variables
107  * ----------------
108  */
109 
110 /* max_stack_depth converted to bytes for speed of checking */
111 static long max_stack_depth_bytes = 100 * 1024L;
112 
113 /*
114  * Stack base pointer -- initialized by PostmasterMain and inherited by
115  * subprocesses. This is not static because old versions of PL/Java modify
116  * it directly. Newer versions use set_stack_base(), but we want to stay
117  * binary-compatible for the time being.
118  */
119 char *stack_base_ptr = NULL;
120 
121 /*
122  * On IA64 we also have to remember the register stack base.
123  */
124 #if defined(__ia64__) || defined(__ia64)
125 char *register_stack_base_ptr = NULL;
126 #endif
127 
128 /*
129  * Flag to keep track of whether we have started a transaction.
130  * For extended query protocol this has to be remembered across messages.
131  */
132 static bool xact_started = false;
133 
134 /*
135  * Flag to indicate that we are doing the outer loop's read-from-client,
136  * as opposed to any random read from client that might happen within
137  * commands like COPY FROM STDIN.
138  */
139 static bool DoingCommandRead = false;
140 
141 /*
142  * Flags to implement skip-till-Sync-after-error behavior for messages of
143  * the extended query protocol.
144  */
145 static bool doing_extended_query_message = false;
146 static bool ignore_till_sync = false;
147 
148 /*
149  * Flag to keep track of whether statement timeout timer is active.
150  */
151 static bool stmt_timeout_active = false;
152 
153 /*
154  * If an unnamed prepared statement exists, it's stored here.
155  * We keep it separate from the hashtable kept by commands/prepare.c
156  * in order to reduce overhead for short-lived queries.
157  */
159 
160 /* assorted command-line switches */
161 static const char *userDoption = NULL; /* -D switch */
162 static bool EchoQuery = false; /* -E switch */
163 static bool UseSemiNewlineNewline = false; /* -j switch */
164 
165 /* whether or not, and why, we were canceled by conflict with recovery */
166 static bool RecoveryConflictPending = false;
167 static bool RecoveryConflictRetryable = true;
169 
170 /* reused buffer to pass to SendRowDescriptionMessage() */
173 
174 /* ----------------------------------------------------------------
175  * decls for routines only used in this file
176  * ----------------------------------------------------------------
177  */
178 static int InteractiveBackend(StringInfo inBuf);
179 static int interactive_getc(void);
180 static int SocketBackend(StringInfo inBuf);
181 static int ReadCommand(StringInfo inBuf);
182 static void forbidden_in_wal_sender(char firstchar);
183 static List *pg_rewrite_query(Query *query);
184 static bool check_log_statement(List *stmt_list);
185 static int errdetail_execute(List *raw_parsetree_list);
186 static int errdetail_params(ParamListInfo params);
187 static int errdetail_abort(void);
188 static int errdetail_recovery_conflict(void);
189 static void start_xact_command(void);
190 static void finish_xact_command(void);
191 static bool IsTransactionExitStmt(Node *parsetree);
192 static bool IsTransactionExitStmtList(List *pstmts);
193 static bool IsTransactionStmtList(List *pstmts);
194 static void drop_unnamed_stmt(void);
195 static void log_disconnections(int code, Datum arg);
196 static void enable_statement_timeout(void);
197 static void disable_statement_timeout(void);
198 
199 
200 /* ----------------------------------------------------------------
201  * routines to obtain user input
202  * ----------------------------------------------------------------
203  */
204 
205 /* ----------------
206  * InteractiveBackend() is called for user interactive connections
207  *
208  * the string entered by the user is placed in its parameter inBuf,
209  * and we act like a Q message was received.
210  *
211  * EOF is returned if end-of-file input is seen; time to shut down.
212  * ----------------
213  */
214 
215 static int
217 {
218  int c; /* character read from getc() */
219 
220  /*
221  * display a prompt and obtain input from the user
222  */
223  printf("backend> ");
224  fflush(stdout);
225 
226  resetStringInfo(inBuf);
227 
228  /*
229  * Read characters until EOF or the appropriate delimiter is seen.
230  */
231  while ((c = interactive_getc()) != EOF)
232  {
233  if (c == '\n')
234  {
236  {
237  /*
238  * In -j mode, semicolon followed by two newlines ends the
239  * command; otherwise treat newline as regular character.
240  */
241  if (inBuf->len > 1 &&
242  inBuf->data[inBuf->len - 1] == '\n' &&
243  inBuf->data[inBuf->len - 2] == ';')
244  {
245  /* might as well drop the second newline */
246  break;
247  }
248  }
249  else
250  {
251  /*
252  * In plain mode, newline ends the command unless preceded by
253  * backslash.
254  */
255  if (inBuf->len > 0 &&
256  inBuf->data[inBuf->len - 1] == '\\')
257  {
258  /* discard backslash from inBuf */
259  inBuf->data[--inBuf->len] = '\0';
260  /* discard newline too */
261  continue;
262  }
263  else
264  {
265  /* keep the newline character, but end the command */
266  appendStringInfoChar(inBuf, '\n');
267  break;
268  }
269  }
270  }
271 
272  /* Not newline, or newline treated as regular character */
273  appendStringInfoChar(inBuf, (char) c);
274  }
275 
276  /* No input before EOF signal means time to quit. */
277  if (c == EOF && inBuf->len == 0)
278  return EOF;
279 
280  /*
281  * otherwise we have a user query so process it.
282  */
283 
284  /* Add '\0' to make it look the same as message case. */
285  appendStringInfoChar(inBuf, (char) '\0');
286 
287  /*
288  * if the query echo flag was given, print the query..
289  */
290  if (EchoQuery)
291  printf("statement: %s\n", inBuf->data);
292  fflush(stdout);
293 
294  return 'Q';
295 }
296 
297 /*
298  * interactive_getc -- collect one character from stdin
299  *
300  * Even though we are not reading from a "client" process, we still want to
301  * respond to signals, particularly SIGTERM/SIGQUIT.
302  */
303 static int
305 {
306  int c;
307 
308  /*
309  * This will not process catchup interrupts or notifications while
310  * reading. But those can't really be relevant for a standalone backend
311  * anyway. To properly handle SIGTERM there's a hack in die() that
312  * directly processes interrupts at this stage...
313  */
315 
316  c = getc(stdin);
317 
319 
320  return c;
321 }
322 
323 /* ----------------
324  * SocketBackend() Is called for frontend-backend connections
325  *
326  * Returns the message type code, and loads message body data into inBuf.
327  *
328  * EOF is returned if the connection is lost.
329  * ----------------
330  */
331 static int
333 {
334  int qtype;
335 
336  /*
337  * Get message type code from the frontend.
338  */
340  pq_startmsgread();
341  qtype = pq_getbyte();
342 
343  if (qtype == EOF) /* frontend disconnected */
344  {
345  if (IsTransactionState())
347  (errcode(ERRCODE_CONNECTION_FAILURE),
348  errmsg("unexpected EOF on client connection with an open transaction")));
349  else
350  {
351  /*
352  * Can't send DEBUG log messages to client at this point. Since
353  * we're disconnecting right away, we don't need to restore
354  * whereToSendOutput.
355  */
357  ereport(DEBUG1,
358  (errcode(ERRCODE_CONNECTION_DOES_NOT_EXIST),
359  errmsg("unexpected EOF on client connection")));
360  }
361  return qtype;
362  }
363 
364  /*
365  * Validate message type code before trying to read body; if we have lost
366  * sync, better to say "command unknown" than to run out of memory because
367  * we used garbage as a length word.
368  *
369  * This also gives us a place to set the doing_extended_query_message flag
370  * as soon as possible.
371  */
372  switch (qtype)
373  {
374  case 'Q': /* simple query */
377  {
378  /* old style without length word; convert */
379  if (pq_getstring(inBuf))
380  {
381  if (IsTransactionState())
383  (errcode(ERRCODE_CONNECTION_FAILURE),
384  errmsg("unexpected EOF on client connection with an open transaction")));
385  else
386  {
387  /*
388  * Can't send DEBUG log messages to client at this
389  * point. Since we're disconnecting right away, we
390  * don't need to restore whereToSendOutput.
391  */
393  ereport(DEBUG1,
394  (errcode(ERRCODE_CONNECTION_DOES_NOT_EXIST),
395  errmsg("unexpected EOF on client connection")));
396  }
397  return EOF;
398  }
399  }
400  break;
401 
402  case 'F': /* fastpath function call */
405  {
406  if (GetOldFunctionMessage(inBuf))
407  {
408  if (IsTransactionState())
410  (errcode(ERRCODE_CONNECTION_FAILURE),
411  errmsg("unexpected EOF on client connection with an open transaction")));
412  else
413  {
414  /*
415  * Can't send DEBUG log messages to client at this
416  * point. Since we're disconnecting right away, we
417  * don't need to restore whereToSendOutput.
418  */
420  ereport(DEBUG1,
421  (errcode(ERRCODE_CONNECTION_DOES_NOT_EXIST),
422  errmsg("unexpected EOF on client connection")));
423  }
424  return EOF;
425  }
426  }
427  break;
428 
429  case 'X': /* terminate */
431  ignore_till_sync = false;
432  break;
433 
434  case 'B': /* bind */
435  case 'C': /* close */
436  case 'D': /* describe */
437  case 'E': /* execute */
438  case 'H': /* flush */
439  case 'P': /* parse */
441  /* these are only legal in protocol 3 */
443  ereport(FATAL,
444  (errcode(ERRCODE_PROTOCOL_VIOLATION),
445  errmsg("invalid frontend message type %d", qtype)));
446  break;
447 
448  case 'S': /* sync */
449  /* stop any active skip-till-Sync */
450  ignore_till_sync = false;
451  /* mark not-extended, so that a new error doesn't begin skip */
453  /* only legal in protocol 3 */
455  ereport(FATAL,
456  (errcode(ERRCODE_PROTOCOL_VIOLATION),
457  errmsg("invalid frontend message type %d", qtype)));
458  break;
459 
460  case 'd': /* copy data */
461  case 'c': /* copy done */
462  case 'f': /* copy fail */
464  /* these are only legal in protocol 3 */
466  ereport(FATAL,
467  (errcode(ERRCODE_PROTOCOL_VIOLATION),
468  errmsg("invalid frontend message type %d", qtype)));
469  break;
470 
471  default:
472 
473  /*
474  * Otherwise we got garbage from the frontend. We treat this as
475  * fatal because we have probably lost message boundary sync, and
476  * there's no good way to recover.
477  */
478  ereport(FATAL,
479  (errcode(ERRCODE_PROTOCOL_VIOLATION),
480  errmsg("invalid frontend message type %d", qtype)));
481  break;
482  }
483 
484  /*
485  * In protocol version 3, all frontend messages have a length word next
486  * after the type code; we can read the message contents independently of
487  * the type.
488  */
490  {
491  if (pq_getmessage(inBuf, 0))
492  return EOF; /* suitable message already logged */
493  }
494  else
495  pq_endmsgread();
497 
498  return qtype;
499 }
500 
501 /* ----------------
502  * ReadCommand reads a command from either the frontend or
503  * standard input, places it in inBuf, and returns the
504  * message type code (first byte of the message).
505  * EOF is returned if end of file.
506  * ----------------
507  */
508 static int
510 {
511  int result;
512 
514  result = SocketBackend(inBuf);
515  else
516  result = InteractiveBackend(inBuf);
517  return result;
518 }
519 
520 /*
521  * ProcessClientReadInterrupt() - Process interrupts specific to client reads
522  *
523  * This is called just before and after low-level reads.
524  * 'blocked' is true if no data was available to read and we plan to retry,
525  * false if about to read or done reading.
526  *
527  * Must preserve errno!
528  */
529 void
531 {
532  int save_errno = errno;
533 
534  if (DoingCommandRead)
535  {
536  /* Check for general interrupts that arrived before/while reading */
538 
539  /* Process sinval catchup interrupts, if any */
542 
543  /* Process notify interrupts, if any */
546  }
547  else if (ProcDiePending)
548  {
549  /*
550  * We're dying. If there is no data available to read, then it's safe
551  * (and sane) to handle that now. If we haven't tried to read yet,
552  * make sure the process latch is set, so that if there is no data
553  * then we'll come back here and die. If we're done reading, also
554  * make sure the process latch is set, as we might've undesirably
555  * cleared it while reading.
556  */
557  if (blocked)
559  else
560  SetLatch(MyLatch);
561  }
562 
563  errno = save_errno;
564 }
565 
566 /*
567  * ProcessClientWriteInterrupt() - Process interrupts specific to client writes
568  *
569  * This is called just before and after low-level writes.
570  * 'blocked' is true if no data could be written and we plan to retry,
571  * false if about to write or done writing.
572  *
573  * Must preserve errno!
574  */
575 void
577 {
578  int save_errno = errno;
579 
580  if (ProcDiePending)
581  {
582  /*
583  * We're dying. If it's not possible to write, then we should handle
584  * that immediately, else a stuck client could indefinitely delay our
585  * response to the signal. If we haven't tried to write yet, make
586  * sure the process latch is set, so that if the write would block
587  * then we'll come back here and die. If we're done writing, also
588  * make sure the process latch is set, as we might've undesirably
589  * cleared it while writing.
590  */
591  if (blocked)
592  {
593  /*
594  * Don't mess with whereToSendOutput if ProcessInterrupts wouldn't
595  * do anything.
596  */
597  if (InterruptHoldoffCount == 0 && CritSectionCount == 0)
598  {
599  /*
600  * We don't want to send the client the error message, as a)
601  * that would possibly block again, and b) it would likely
602  * lead to loss of protocol sync because we may have already
603  * sent a partial protocol message.
604  */
607 
609  }
610  }
611  else
612  SetLatch(MyLatch);
613  }
614 
615  errno = save_errno;
616 }
617 
618 /*
619  * Do raw parsing (only).
620  *
621  * A list of parsetrees (RawStmt nodes) is returned, since there might be
622  * multiple commands in the given string.
623  *
624  * NOTE: for interactive queries, it is important to keep this routine
625  * separate from the analysis & rewrite stages. Analysis and rewriting
626  * cannot be done in an aborted transaction, since they require access to
627  * database tables. So, we rely on the raw parser to determine whether
628  * we've seen a COMMIT or ABORT command; when we are in abort state, other
629  * commands are not processed any further than the raw parse stage.
630  */
631 List *
632 pg_parse_query(const char *query_string)
633 {
634  List *raw_parsetree_list;
635 
636  TRACE_POSTGRESQL_QUERY_PARSE_START(query_string);
637 
638  if (log_parser_stats)
639  ResetUsage();
640 
641  raw_parsetree_list = raw_parser(query_string);
642 
643  if (log_parser_stats)
644  ShowUsage("PARSER STATISTICS");
645 
646 #ifdef COPY_PARSE_PLAN_TREES
647  /* Optional debugging check: pass raw parsetrees through copyObject() */
648  {
649  List *new_list = copyObject(raw_parsetree_list);
650 
651  /* This checks both copyObject() and the equal() routines... */
652  if (!equal(new_list, raw_parsetree_list))
653  elog(WARNING, "copyObject() failed to produce an equal raw parse tree");
654  else
655  raw_parsetree_list = new_list;
656  }
657 #endif
658 
659  /*
660  * Currently, outfuncs/readfuncs support is missing for many raw parse
661  * tree nodes, so we don't try to implement WRITE_READ_PARSE_PLAN_TREES
662  * here.
663  */
664 
665  TRACE_POSTGRESQL_QUERY_PARSE_DONE(query_string);
666 
667  return raw_parsetree_list;
668 }
669 
670 /*
671  * Given a raw parsetree (gram.y output), and optionally information about
672  * types of parameter symbols ($n), perform parse analysis and rule rewriting.
673  *
674  * A list of Query nodes is returned, since either the analyzer or the
675  * rewriter might expand one query to several.
676  *
677  * NOTE: for reasons mentioned above, this must be separate from raw parsing.
678  */
679 List *
680 pg_analyze_and_rewrite(RawStmt *parsetree, const char *query_string,
681  Oid *paramTypes, int numParams,
682  QueryEnvironment *queryEnv)
683 {
684  Query *query;
685  List *querytree_list;
686 
687  TRACE_POSTGRESQL_QUERY_REWRITE_START(query_string);
688 
689  /*
690  * (1) Perform parse analysis.
691  */
692  if (log_parser_stats)
693  ResetUsage();
694 
695  query = parse_analyze(parsetree, query_string, paramTypes, numParams,
696  queryEnv);
697 
698  if (log_parser_stats)
699  ShowUsage("PARSE ANALYSIS STATISTICS");
700 
701  /*
702  * (2) Rewrite the queries, as necessary
703  */
704  querytree_list = pg_rewrite_query(query);
705 
706  TRACE_POSTGRESQL_QUERY_REWRITE_DONE(query_string);
707 
708  return querytree_list;
709 }
710 
711 /*
712  * Do parse analysis and rewriting. This is the same as pg_analyze_and_rewrite
713  * except that external-parameter resolution is determined by parser callback
714  * hooks instead of a fixed list of parameter datatypes.
715  */
716 List *
718  const char *query_string,
719  ParserSetupHook parserSetup,
720  void *parserSetupArg,
721  QueryEnvironment *queryEnv)
722 {
723  ParseState *pstate;
724  Query *query;
725  List *querytree_list;
726 
727  Assert(query_string != NULL); /* required as of 8.4 */
728 
729  TRACE_POSTGRESQL_QUERY_REWRITE_START(query_string);
730 
731  /*
732  * (1) Perform parse analysis.
733  */
734  if (log_parser_stats)
735  ResetUsage();
736 
737  pstate = make_parsestate(NULL);
738  pstate->p_sourcetext = query_string;
739  pstate->p_queryEnv = queryEnv;
740  (*parserSetup) (pstate, parserSetupArg);
741 
742  query = transformTopLevelStmt(pstate, parsetree);
743 
745  (*post_parse_analyze_hook) (pstate, query);
746 
747  free_parsestate(pstate);
748 
749  if (log_parser_stats)
750  ShowUsage("PARSE ANALYSIS STATISTICS");
751 
752  /*
753  * (2) Rewrite the queries, as necessary
754  */
755  querytree_list = pg_rewrite_query(query);
756 
757  TRACE_POSTGRESQL_QUERY_REWRITE_DONE(query_string);
758 
759  return querytree_list;
760 }
761 
762 /*
763  * Perform rewriting of a query produced by parse analysis.
764  *
765  * Note: query must just have come from the parser, because we do not do
766  * AcquireRewriteLocks() on it.
767  */
768 static List *
770 {
771  List *querytree_list;
772 
773  if (Debug_print_parse)
774  elog_node_display(LOG, "parse tree", query,
776 
777  if (log_parser_stats)
778  ResetUsage();
779 
780  if (query->commandType == CMD_UTILITY)
781  {
782  /* don't rewrite utilities, just dump 'em into result list */
783  querytree_list = list_make1(query);
784  }
785  else
786  {
787  /* rewrite regular queries */
788  querytree_list = QueryRewrite(query);
789  }
790 
791  if (log_parser_stats)
792  ShowUsage("REWRITER STATISTICS");
793 
794 #ifdef COPY_PARSE_PLAN_TREES
795  /* Optional debugging check: pass querytree through copyObject() */
796  {
797  List *new_list;
798 
799  new_list = copyObject(querytree_list);
800  /* This checks both copyObject() and the equal() routines... */
801  if (!equal(new_list, querytree_list))
802  elog(WARNING, "copyObject() failed to produce equal parse tree");
803  else
804  querytree_list = new_list;
805  }
806 #endif
807 
808 #ifdef WRITE_READ_PARSE_PLAN_TREES
809  /* Optional debugging check: pass querytree through outfuncs/readfuncs */
810  {
811  List *new_list = NIL;
812  ListCell *lc;
813 
814  /*
815  * We currently lack outfuncs/readfuncs support for most utility
816  * statement types, so only attempt to write/read non-utility queries.
817  */
818  foreach(lc, querytree_list)
819  {
820  Query *query = castNode(Query, lfirst(lc));
821 
822  if (query->commandType != CMD_UTILITY)
823  {
824  char *str = nodeToString(query);
825  Query *new_query = stringToNodeWithLocations(str);
826 
827  /*
828  * queryId is not saved in stored rules, but we must preserve
829  * it here to avoid breaking pg_stat_statements.
830  */
831  new_query->queryId = query->queryId;
832 
833  new_list = lappend(new_list, new_query);
834  pfree(str);
835  }
836  else
837  new_list = lappend(new_list, query);
838  }
839 
840  /* This checks both outfuncs/readfuncs and the equal() routines... */
841  if (!equal(new_list, querytree_list))
842  elog(WARNING, "outfuncs/readfuncs failed to produce equal parse tree");
843  else
844  querytree_list = new_list;
845  }
846 #endif
847 
849  elog_node_display(LOG, "rewritten parse tree", querytree_list,
851 
852  return querytree_list;
853 }
854 
855 
856 /*
857  * Generate a plan for a single already-rewritten query.
858  * This is a thin wrapper around planner() and takes the same parameters.
859  */
860 PlannedStmt *
861 pg_plan_query(Query *querytree, int cursorOptions, ParamListInfo boundParams)
862 {
863  PlannedStmt *plan;
864 
865  /* Utility commands have no plans. */
866  if (querytree->commandType == CMD_UTILITY)
867  return NULL;
868 
869  /* Planner must have a snapshot in case it calls user-defined functions. */
871 
872  TRACE_POSTGRESQL_QUERY_PLAN_START();
873 
874  if (log_planner_stats)
875  ResetUsage();
876 
877  /* call the optimizer */
878  plan = planner(querytree, cursorOptions, boundParams);
879 
880  if (log_planner_stats)
881  ShowUsage("PLANNER STATISTICS");
882 
883 #ifdef COPY_PARSE_PLAN_TREES
884  /* Optional debugging check: pass plan tree through copyObject() */
885  {
886  PlannedStmt *new_plan = copyObject(plan);
887 
888  /*
889  * equal() currently does not have routines to compare Plan nodes, so
890  * don't try to test equality here. Perhaps fix someday?
891  */
892 #ifdef NOT_USED
893  /* This checks both copyObject() and the equal() routines... */
894  if (!equal(new_plan, plan))
895  elog(WARNING, "copyObject() failed to produce an equal plan tree");
896  else
897 #endif
898  plan = new_plan;
899  }
900 #endif
901 
902 #ifdef WRITE_READ_PARSE_PLAN_TREES
903  /* Optional debugging check: pass plan tree through outfuncs/readfuncs */
904  {
905  char *str;
906  PlannedStmt *new_plan;
907 
908  str = nodeToString(plan);
909  new_plan = stringToNodeWithLocations(str);
910  pfree(str);
911 
912  /*
913  * equal() currently does not have routines to compare Plan nodes, so
914  * don't try to test equality here. Perhaps fix someday?
915  */
916 #ifdef NOT_USED
917  /* This checks both outfuncs/readfuncs and the equal() routines... */
918  if (!equal(new_plan, plan))
919  elog(WARNING, "outfuncs/readfuncs failed to produce an equal plan tree");
920  else
921 #endif
922  plan = new_plan;
923  }
924 #endif
925 
926  /*
927  * Print plan if debugging.
928  */
929  if (Debug_print_plan)
930  elog_node_display(LOG, "plan", plan, Debug_pretty_print);
931 
932  TRACE_POSTGRESQL_QUERY_PLAN_DONE();
933 
934  return plan;
935 }
936 
937 /*
938  * Generate plans for a list of already-rewritten queries.
939  *
940  * For normal optimizable statements, invoke the planner. For utility
941  * statements, just make a wrapper PlannedStmt node.
942  *
943  * The result is a list of PlannedStmt nodes.
944  */
945 List *
946 pg_plan_queries(List *querytrees, int cursorOptions, ParamListInfo boundParams)
947 {
948  List *stmt_list = NIL;
949  ListCell *query_list;
950 
951  foreach(query_list, querytrees)
952  {
953  Query *query = lfirst_node(Query, query_list);
954  PlannedStmt *stmt;
955 
956  if (query->commandType == CMD_UTILITY)
957  {
958  /* Utility commands require no planning. */
959  stmt = makeNode(PlannedStmt);
960  stmt->commandType = CMD_UTILITY;
961  stmt->canSetTag = query->canSetTag;
962  stmt->utilityStmt = query->utilityStmt;
963  stmt->stmt_location = query->stmt_location;
964  stmt->stmt_len = query->stmt_len;
965  }
966  else
967  {
968  stmt = pg_plan_query(query, cursorOptions, boundParams);
969  }
970 
971  stmt_list = lappend(stmt_list, stmt);
972  }
973 
974  return stmt_list;
975 }
976 
977 
978 /*
979  * exec_simple_query
980  *
981  * Execute a "simple Query" protocol message.
982  */
983 static void
984 exec_simple_query(const char *query_string)
985 {
987  MemoryContext oldcontext;
988  List *parsetree_list;
989  ListCell *parsetree_item;
990  bool save_log_statement_stats = log_statement_stats;
991  bool was_logged = false;
992  bool use_implicit_block;
993  char msec_str[32];
994 
995  /*
996  * Report query to various monitoring facilities.
997  */
998  debug_query_string = query_string;
999 
1000  pgstat_report_activity(STATE_RUNNING, query_string);
1001 
1002  TRACE_POSTGRESQL_QUERY_START(query_string);
1003 
1004  /*
1005  * We use save_log_statement_stats so ShowUsage doesn't report incorrect
1006  * results because ResetUsage wasn't called.
1007  */
1008  if (save_log_statement_stats)
1009  ResetUsage();
1010 
1011  /*
1012  * Start up a transaction command. All queries generated by the
1013  * query_string will be in this same command block, *unless* we find a
1014  * BEGIN/COMMIT/ABORT statement; we have to force a new xact command after
1015  * one of those, else bad things will happen in xact.c. (Note that this
1016  * will normally change current memory context.)
1017  */
1019 
1020  /*
1021  * Zap any pre-existing unnamed statement. (While not strictly necessary,
1022  * it seems best to define simple-Query mode as if it used the unnamed
1023  * statement and portal; this ensures we recover any storage used by prior
1024  * unnamed operations.)
1025  */
1027 
1028  /*
1029  * Switch to appropriate context for constructing parsetrees.
1030  */
1031  oldcontext = MemoryContextSwitchTo(MessageContext);
1032 
1033  /*
1034  * Do basic parsing of the query or queries (this should be safe even if
1035  * we are in aborted transaction state!)
1036  */
1037  parsetree_list = pg_parse_query(query_string);
1038 
1039  /* Log immediately if dictated by log_statement */
1040  if (check_log_statement(parsetree_list))
1041  {
1042  ereport(LOG,
1043  (errmsg("statement: %s", query_string),
1044  errhidestmt(true),
1045  errdetail_execute(parsetree_list)));
1046  was_logged = true;
1047  }
1048 
1049  /*
1050  * Switch back to transaction context to enter the loop.
1051  */
1052  MemoryContextSwitchTo(oldcontext);
1053 
1054  /*
1055  * For historical reasons, if multiple SQL statements are given in a
1056  * single "simple Query" message, we execute them as a single transaction,
1057  * unless explicit transaction control commands are included to make
1058  * portions of the list be separate transactions. To represent this
1059  * behavior properly in the transaction machinery, we use an "implicit"
1060  * transaction block.
1061  */
1062  use_implicit_block = (list_length(parsetree_list) > 1);
1063 
1064  /*
1065  * Run through the raw parsetree(s) and process each one.
1066  */
1067  foreach(parsetree_item, parsetree_list)
1068  {
1069  RawStmt *parsetree = lfirst_node(RawStmt, parsetree_item);
1070  bool snapshot_set = false;
1071  const char *commandTag;
1072  char completionTag[COMPLETION_TAG_BUFSIZE];
1073  List *querytree_list,
1074  *plantree_list;
1075  Portal portal;
1076  DestReceiver *receiver;
1077  int16 format;
1078 
1079  /*
1080  * Get the command name for use in status display (it also becomes the
1081  * default completion tag, down inside PortalRun). Set ps_status and
1082  * do any special start-of-SQL-command processing needed by the
1083  * destination.
1084  */
1085  commandTag = CreateCommandTag(parsetree->stmt);
1086 
1087  set_ps_display(commandTag, false);
1088 
1089  BeginCommand(commandTag, dest);
1090 
1091  /*
1092  * If we are in an aborted transaction, reject all commands except
1093  * COMMIT/ABORT. It is important that this test occur before we try
1094  * to do parse analysis, rewrite, or planning, since all those phases
1095  * try to do database accesses, which may fail in abort state. (It
1096  * might be safe to allow some additional utility commands in this
1097  * state, but not many...)
1098  */
1100  !IsTransactionExitStmt(parsetree->stmt))
1101  ereport(ERROR,
1102  (errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
1103  errmsg("current transaction is aborted, "
1104  "commands ignored until end of transaction block"),
1105  errdetail_abort()));
1106 
1107  /* Make sure we are in a transaction command */
1109 
1110  /*
1111  * If using an implicit transaction block, and we're not already in a
1112  * transaction block, start an implicit block to force this statement
1113  * to be grouped together with any following ones. (We must do this
1114  * each time through the loop; otherwise, a COMMIT/ROLLBACK in the
1115  * list would cause later statements to not be grouped.)
1116  */
1117  if (use_implicit_block)
1119 
1120  /* If we got a cancel signal in parsing or prior command, quit */
1122 
1123  /*
1124  * Set up a snapshot if parse analysis/planning will need one.
1125  */
1126  if (analyze_requires_snapshot(parsetree))
1127  {
1129  snapshot_set = true;
1130  }
1131 
1132  /*
1133  * OK to analyze, rewrite, and plan this query.
1134  *
1135  * Switch to appropriate context for constructing querytrees (again,
1136  * these must outlive the execution context).
1137  */
1138  oldcontext = MemoryContextSwitchTo(MessageContext);
1139 
1140  querytree_list = pg_analyze_and_rewrite(parsetree, query_string,
1141  NULL, 0, NULL);
1142 
1143  plantree_list = pg_plan_queries(querytree_list,
1144  CURSOR_OPT_PARALLEL_OK, NULL);
1145 
1146  /* Done with the snapshot used for parsing/planning */
1147  if (snapshot_set)
1149 
1150  /* If we got a cancel signal in analysis or planning, quit */
1152 
1153  /*
1154  * Create unnamed portal to run the query or queries in. If there
1155  * already is one, silently drop it.
1156  */
1157  portal = CreatePortal("", true, true);
1158  /* Don't display the portal in pg_cursors */
1159  portal->visible = false;
1160 
1161  /*
1162  * We don't have to copy anything into the portal, because everything
1163  * we are passing here is in MessageContext, which will outlive the
1164  * portal anyway.
1165  */
1166  PortalDefineQuery(portal,
1167  NULL,
1168  query_string,
1169  commandTag,
1170  plantree_list,
1171  NULL);
1172 
1173  /*
1174  * Start the portal. No parameters here.
1175  */
1176  PortalStart(portal, NULL, 0, InvalidSnapshot);
1177 
1178  /*
1179  * Select the appropriate output format: text unless we are doing a
1180  * FETCH from a binary cursor. (Pretty grotty to have to do this here
1181  * --- but it avoids grottiness in other places. Ah, the joys of
1182  * backward compatibility...)
1183  */
1184  format = 0; /* TEXT is default */
1185  if (IsA(parsetree->stmt, FetchStmt))
1186  {
1187  FetchStmt *stmt = (FetchStmt *) parsetree->stmt;
1188 
1189  if (!stmt->ismove)
1190  {
1191  Portal fportal = GetPortalByName(stmt->portalname);
1192 
1193  if (PortalIsValid(fportal) &&
1194  (fportal->cursorOptions & CURSOR_OPT_BINARY))
1195  format = 1; /* BINARY */
1196  }
1197  }
1198  PortalSetResultFormat(portal, 1, &format);
1199 
1200  /*
1201  * Now we can create the destination receiver object.
1202  */
1203  receiver = CreateDestReceiver(dest);
1204  if (dest == DestRemote)
1205  SetRemoteDestReceiverParams(receiver, portal);
1206 
1207  /*
1208  * Switch back to transaction context for execution.
1209  */
1210  MemoryContextSwitchTo(oldcontext);
1211 
1212  /*
1213  * Run the portal to completion, and then drop it (and the receiver).
1214  */
1215  (void) PortalRun(portal,
1216  FETCH_ALL,
1217  true, /* always top level */
1218  true,
1219  receiver,
1220  receiver,
1221  completionTag);
1222 
1223  receiver->rDestroy(receiver);
1224 
1225  PortalDrop(portal, false);
1226 
1227  if (lnext(parsetree_item) == NULL)
1228  {
1229  /*
1230  * If this is the last parsetree of the query string, close down
1231  * transaction statement before reporting command-complete. This
1232  * is so that any end-of-transaction errors are reported before
1233  * the command-complete message is issued, to avoid confusing
1234  * clients who will expect either a command-complete message or an
1235  * error, not one and then the other. Also, if we're using an
1236  * implicit transaction block, we must close that out first.
1237  */
1238  if (use_implicit_block)
1241  }
1242  else if (IsA(parsetree->stmt, TransactionStmt))
1243  {
1244  /*
1245  * If this was a transaction control statement, commit it. We will
1246  * start a new xact command for the next command.
1247  */
1249  }
1250  else
1251  {
1252  /*
1253  * We need a CommandCounterIncrement after every query, except
1254  * those that start or end a transaction block.
1255  */
1257  }
1258 
1259  /*
1260  * Tell client that we're done with this query. Note we emit exactly
1261  * one EndCommand report for each raw parsetree, thus one for each SQL
1262  * command the client sent, regardless of rewriting. (But a command
1263  * aborted by error will not send an EndCommand report at all.)
1264  */
1265  EndCommand(completionTag, dest);
1266  } /* end loop over parsetrees */
1267 
1268  /*
1269  * Close down transaction statement, if one is open. (This will only do
1270  * something if the parsetree list was empty; otherwise the last loop
1271  * iteration already did it.)
1272  */
1274 
1275  /*
1276  * If there were no parsetrees, return EmptyQueryResponse message.
1277  */
1278  if (!parsetree_list)
1279  NullCommand(dest);
1280 
1281  /*
1282  * Emit duration logging if appropriate.
1283  */
1284  switch (check_log_duration(msec_str, was_logged))
1285  {
1286  case 1:
1287  ereport(LOG,
1288  (errmsg("duration: %s ms", msec_str),
1289  errhidestmt(true)));
1290  break;
1291  case 2:
1292  ereport(LOG,
1293  (errmsg("duration: %s ms statement: %s",
1294  msec_str, query_string),
1295  errhidestmt(true),
1296  errdetail_execute(parsetree_list)));
1297  break;
1298  }
1299 
1300  if (save_log_statement_stats)
1301  ShowUsage("QUERY STATISTICS");
1302 
1303  TRACE_POSTGRESQL_QUERY_DONE(query_string);
1304 
1305  debug_query_string = NULL;
1306 }
1307 
1308 /*
1309  * exec_parse_message
1310  *
1311  * Execute a "Parse" protocol message.
1312  */
1313 static void
1314 exec_parse_message(const char *query_string, /* string to execute */
1315  const char *stmt_name, /* name for prepared stmt */
1316  Oid *paramTypes, /* parameter types */
1317  int numParams) /* number of parameters */
1318 {
1319  MemoryContext unnamed_stmt_context = NULL;
1320  MemoryContext oldcontext;
1321  List *parsetree_list;
1322  RawStmt *raw_parse_tree;
1323  const char *commandTag;
1324  List *querytree_list;
1325  CachedPlanSource *psrc;
1326  bool is_named;
1327  bool save_log_statement_stats = log_statement_stats;
1328  char msec_str[32];
1329 
1330  /*
1331  * Report query to various monitoring facilities.
1332  */
1333  debug_query_string = query_string;
1334 
1335  pgstat_report_activity(STATE_RUNNING, query_string);
1336 
1337  set_ps_display("PARSE", false);
1338 
1339  if (save_log_statement_stats)
1340  ResetUsage();
1341 
1342  ereport(DEBUG2,
1343  (errmsg("parse %s: %s",
1344  *stmt_name ? stmt_name : "<unnamed>",
1345  query_string)));
1346 
1347  /*
1348  * Start up a transaction command so we can run parse analysis etc. (Note
1349  * that this will normally change current memory context.) Nothing happens
1350  * if we are already in one. This also arms the statement timeout if
1351  * necessary.
1352  */
1354 
1355  /*
1356  * Switch to appropriate context for constructing parsetrees.
1357  *
1358  * We have two strategies depending on whether the prepared statement is
1359  * named or not. For a named prepared statement, we do parsing in
1360  * MessageContext and copy the finished trees into the prepared
1361  * statement's plancache entry; then the reset of MessageContext releases
1362  * temporary space used by parsing and rewriting. For an unnamed prepared
1363  * statement, we assume the statement isn't going to hang around long, so
1364  * getting rid of temp space quickly is probably not worth the costs of
1365  * copying parse trees. So in this case, we create the plancache entry's
1366  * query_context here, and do all the parsing work therein.
1367  */
1368  is_named = (stmt_name[0] != '\0');
1369  if (is_named)
1370  {
1371  /* Named prepared statement --- parse in MessageContext */
1372  oldcontext = MemoryContextSwitchTo(MessageContext);
1373  }
1374  else
1375  {
1376  /* Unnamed prepared statement --- release any prior unnamed stmt */
1378  /* Create context for parsing */
1379  unnamed_stmt_context =
1381  "unnamed prepared statement",
1383  oldcontext = MemoryContextSwitchTo(unnamed_stmt_context);
1384  }
1385 
1386  /*
1387  * Do basic parsing of the query or queries (this should be safe even if
1388  * we are in aborted transaction state!)
1389  */
1390  parsetree_list = pg_parse_query(query_string);
1391 
1392  /*
1393  * We only allow a single user statement in a prepared statement. This is
1394  * mainly to keep the protocol simple --- otherwise we'd need to worry
1395  * about multiple result tupdescs and things like that.
1396  */
1397  if (list_length(parsetree_list) > 1)
1398  ereport(ERROR,
1399  (errcode(ERRCODE_SYNTAX_ERROR),
1400  errmsg("cannot insert multiple commands into a prepared statement")));
1401 
1402  if (parsetree_list != NIL)
1403  {
1404  Query *query;
1405  bool snapshot_set = false;
1406 
1407  raw_parse_tree = linitial_node(RawStmt, parsetree_list);
1408 
1409  /*
1410  * Get the command name for possible use in status display.
1411  */
1412  commandTag = CreateCommandTag(raw_parse_tree->stmt);
1413 
1414  /*
1415  * If we are in an aborted transaction, reject all commands except
1416  * COMMIT/ROLLBACK. It is important that this test occur before we
1417  * try to do parse analysis, rewrite, or planning, since all those
1418  * phases try to do database accesses, which may fail in abort state.
1419  * (It might be safe to allow some additional utility commands in this
1420  * state, but not many...)
1421  */
1423  !IsTransactionExitStmt(raw_parse_tree->stmt))
1424  ereport(ERROR,
1425  (errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
1426  errmsg("current transaction is aborted, "
1427  "commands ignored until end of transaction block"),
1428  errdetail_abort()));
1429 
1430  /*
1431  * Create the CachedPlanSource before we do parse analysis, since it
1432  * needs to see the unmodified raw parse tree.
1433  */
1434  psrc = CreateCachedPlan(raw_parse_tree, query_string, commandTag);
1435 
1436  /*
1437  * Set up a snapshot if parse analysis will need one.
1438  */
1439  if (analyze_requires_snapshot(raw_parse_tree))
1440  {
1442  snapshot_set = true;
1443  }
1444 
1445  /*
1446  * Analyze and rewrite the query. Note that the originally specified
1447  * parameter set is not required to be complete, so we have to use
1448  * parse_analyze_varparams().
1449  */
1450  if (log_parser_stats)
1451  ResetUsage();
1452 
1453  query = parse_analyze_varparams(raw_parse_tree,
1454  query_string,
1455  &paramTypes,
1456  &numParams);
1457 
1458  /*
1459  * Check all parameter types got determined.
1460  */
1461  for (int i = 0; i < numParams; i++)
1462  {
1463  Oid ptype = paramTypes[i];
1464 
1465  if (ptype == InvalidOid || ptype == UNKNOWNOID)
1466  ereport(ERROR,
1467  (errcode(ERRCODE_INDETERMINATE_DATATYPE),
1468  errmsg("could not determine data type of parameter $%d",
1469  i + 1)));
1470  }
1471 
1472  if (log_parser_stats)
1473  ShowUsage("PARSE ANALYSIS STATISTICS");
1474 
1475  querytree_list = pg_rewrite_query(query);
1476 
1477  /* Done with the snapshot used for parsing */
1478  if (snapshot_set)
1480  }
1481  else
1482  {
1483  /* Empty input string. This is legal. */
1484  raw_parse_tree = NULL;
1485  commandTag = NULL;
1486  psrc = CreateCachedPlan(raw_parse_tree, query_string, commandTag);
1487  querytree_list = NIL;
1488  }
1489 
1490  /*
1491  * CachedPlanSource must be a direct child of MessageContext before we
1492  * reparent unnamed_stmt_context under it, else we have a disconnected
1493  * circular subgraph. Klugy, but less so than flipping contexts even more
1494  * above.
1495  */
1496  if (unnamed_stmt_context)
1498 
1499  /* Finish filling in the CachedPlanSource */
1500  CompleteCachedPlan(psrc,
1501  querytree_list,
1502  unnamed_stmt_context,
1503  paramTypes,
1504  numParams,
1505  NULL,
1506  NULL,
1507  CURSOR_OPT_PARALLEL_OK, /* allow parallel mode */
1508  true); /* fixed result */
1509 
1510  /* If we got a cancel signal during analysis, quit */
1512 
1513  if (is_named)
1514  {
1515  /*
1516  * Store the query as a prepared statement.
1517  */
1518  StorePreparedStatement(stmt_name, psrc, false);
1519  }
1520  else
1521  {
1522  /*
1523  * We just save the CachedPlanSource into unnamed_stmt_psrc.
1524  */
1525  SaveCachedPlan(psrc);
1526  unnamed_stmt_psrc = psrc;
1527  }
1528 
1529  MemoryContextSwitchTo(oldcontext);
1530 
1531  /*
1532  * We do NOT close the open transaction command here; that only happens
1533  * when the client sends Sync. Instead, do CommandCounterIncrement just
1534  * in case something happened during parse/plan.
1535  */
1537 
1538  /*
1539  * Send ParseComplete.
1540  */
1542  pq_putemptymessage('1');
1543 
1544  /*
1545  * Emit duration logging if appropriate.
1546  */
1547  switch (check_log_duration(msec_str, false))
1548  {
1549  case 1:
1550  ereport(LOG,
1551  (errmsg("duration: %s ms", msec_str),
1552  errhidestmt(true)));
1553  break;
1554  case 2:
1555  ereport(LOG,
1556  (errmsg("duration: %s ms parse %s: %s",
1557  msec_str,
1558  *stmt_name ? stmt_name : "<unnamed>",
1559  query_string),
1560  errhidestmt(true)));
1561  break;
1562  }
1563 
1564  if (save_log_statement_stats)
1565  ShowUsage("PARSE MESSAGE STATISTICS");
1566 
1567  debug_query_string = NULL;
1568 }
1569 
1570 /*
1571  * exec_bind_message
1572  *
1573  * Process a "Bind" message to create a portal from a prepared statement
1574  */
1575 static void
1577 {
1578  const char *portal_name;
1579  const char *stmt_name;
1580  int numPFormats;
1581  int16 *pformats = NULL;
1582  int numParams;
1583  int numRFormats;
1584  int16 *rformats = NULL;
1585  CachedPlanSource *psrc;
1586  CachedPlan *cplan;
1587  Portal portal;
1588  char *query_string;
1589  char *saved_stmt_name;
1590  ParamListInfo params;
1591  MemoryContext oldContext;
1592  bool save_log_statement_stats = log_statement_stats;
1593  bool snapshot_set = false;
1594  char msec_str[32];
1595 
1596  /* Get the fixed part of the message */
1597  portal_name = pq_getmsgstring(input_message);
1598  stmt_name = pq_getmsgstring(input_message);
1599 
1600  ereport(DEBUG2,
1601  (errmsg("bind %s to %s",
1602  *portal_name ? portal_name : "<unnamed>",
1603  *stmt_name ? stmt_name : "<unnamed>")));
1604 
1605  /* Find prepared statement */
1606  if (stmt_name[0] != '\0')
1607  {
1608  PreparedStatement *pstmt;
1609 
1610  pstmt = FetchPreparedStatement(stmt_name, true);
1611  psrc = pstmt->plansource;
1612  }
1613  else
1614  {
1615  /* special-case the unnamed statement */
1616  psrc = unnamed_stmt_psrc;
1617  if (!psrc)
1618  ereport(ERROR,
1619  (errcode(ERRCODE_UNDEFINED_PSTATEMENT),
1620  errmsg("unnamed prepared statement does not exist")));
1621  }
1622 
1623  /*
1624  * Report query to various monitoring facilities.
1625  */
1627 
1629 
1630  set_ps_display("BIND", false);
1631 
1632  if (save_log_statement_stats)
1633  ResetUsage();
1634 
1635  /*
1636  * Start up a transaction command so we can call functions etc. (Note that
1637  * this will normally change current memory context.) Nothing happens if
1638  * we are already in one. This also arms the statement timeout if
1639  * necessary.
1640  */
1642 
1643  /* Switch back to message context */
1645 
1646  /* Get the parameter format codes */
1647  numPFormats = pq_getmsgint(input_message, 2);
1648  if (numPFormats > 0)
1649  {
1650  pformats = (int16 *) palloc(numPFormats * sizeof(int16));
1651  for (int i = 0; i < numPFormats; i++)
1652  pformats[i] = pq_getmsgint(input_message, 2);
1653  }
1654 
1655  /* Get the parameter value count */
1656  numParams = pq_getmsgint(input_message, 2);
1657 
1658  if (numPFormats > 1 && numPFormats != numParams)
1659  ereport(ERROR,
1660  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1661  errmsg("bind message has %d parameter formats but %d parameters",
1662  numPFormats, numParams)));
1663 
1664  if (numParams != psrc->num_params)
1665  ereport(ERROR,
1666  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1667  errmsg("bind message supplies %d parameters, but prepared statement \"%s\" requires %d",
1668  numParams, stmt_name, psrc->num_params)));
1669 
1670  /*
1671  * If we are in aborted transaction state, the only portals we can
1672  * actually run are those containing COMMIT or ROLLBACK commands. We
1673  * disallow binding anything else to avoid problems with infrastructure
1674  * that expects to run inside a valid transaction. We also disallow
1675  * binding any parameters, since we can't risk calling user-defined I/O
1676  * functions.
1677  */
1679  (!(psrc->raw_parse_tree &&
1681  numParams != 0))
1682  ereport(ERROR,
1683  (errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
1684  errmsg("current transaction is aborted, "
1685  "commands ignored until end of transaction block"),
1686  errdetail_abort()));
1687 
1688  /*
1689  * Create the portal. Allow silent replacement of an existing portal only
1690  * if the unnamed portal is specified.
1691  */
1692  if (portal_name[0] == '\0')
1693  portal = CreatePortal(portal_name, true, true);
1694  else
1695  portal = CreatePortal(portal_name, false, false);
1696 
1697  /*
1698  * Prepare to copy stuff into the portal's memory context. We do all this
1699  * copying first, because it could possibly fail (out-of-memory) and we
1700  * don't want a failure to occur between GetCachedPlan and
1701  * PortalDefineQuery; that would result in leaking our plancache refcount.
1702  */
1703  oldContext = MemoryContextSwitchTo(portal->portalContext);
1704 
1705  /* Copy the plan's query string into the portal */
1706  query_string = pstrdup(psrc->query_string);
1707 
1708  /* Likewise make a copy of the statement name, unless it's unnamed */
1709  if (stmt_name[0])
1710  saved_stmt_name = pstrdup(stmt_name);
1711  else
1712  saved_stmt_name = NULL;
1713 
1714  /*
1715  * Set a snapshot if we have parameters to fetch (since the input
1716  * functions might need it) or the query isn't a utility command (and
1717  * hence could require redoing parse analysis and planning). We keep the
1718  * snapshot active till we're done, so that plancache.c doesn't have to
1719  * take new ones.
1720  */
1721  if (numParams > 0 ||
1722  (psrc->raw_parse_tree &&
1724  {
1726  snapshot_set = true;
1727  }
1728 
1729  /*
1730  * Fetch parameters, if any, and store in the portal's memory context.
1731  */
1732  if (numParams > 0)
1733  {
1734  params = makeParamList(numParams);
1735 
1736  for (int paramno = 0; paramno < numParams; paramno++)
1737  {
1738  Oid ptype = psrc->param_types[paramno];
1739  int32 plength;
1740  Datum pval;
1741  bool isNull;
1742  StringInfoData pbuf;
1743  char csave;
1744  int16 pformat;
1745 
1746  plength = pq_getmsgint(input_message, 4);
1747  isNull = (plength == -1);
1748 
1749  if (!isNull)
1750  {
1751  const char *pvalue = pq_getmsgbytes(input_message, plength);
1752 
1753  /*
1754  * Rather than copying data around, we just set up a phony
1755  * StringInfo pointing to the correct portion of the message
1756  * buffer. We assume we can scribble on the message buffer so
1757  * as to maintain the convention that StringInfos have a
1758  * trailing null. This is grotty but is a big win when
1759  * dealing with very large parameter strings.
1760  */
1761  pbuf.data = unconstify(char *, pvalue);
1762  pbuf.maxlen = plength + 1;
1763  pbuf.len = plength;
1764  pbuf.cursor = 0;
1765 
1766  csave = pbuf.data[plength];
1767  pbuf.data[plength] = '\0';
1768  }
1769  else
1770  {
1771  pbuf.data = NULL; /* keep compiler quiet */
1772  csave = 0;
1773  }
1774 
1775  if (numPFormats > 1)
1776  pformat = pformats[paramno];
1777  else if (numPFormats > 0)
1778  pformat = pformats[0];
1779  else
1780  pformat = 0; /* default = text */
1781 
1782  if (pformat == 0) /* text mode */
1783  {
1784  Oid typinput;
1785  Oid typioparam;
1786  char *pstring;
1787 
1788  getTypeInputInfo(ptype, &typinput, &typioparam);
1789 
1790  /*
1791  * We have to do encoding conversion before calling the
1792  * typinput routine.
1793  */
1794  if (isNull)
1795  pstring = NULL;
1796  else
1797  pstring = pg_client_to_server(pbuf.data, plength);
1798 
1799  pval = OidInputFunctionCall(typinput, pstring, typioparam, -1);
1800 
1801  /* Free result of encoding conversion, if any */
1802  if (pstring && pstring != pbuf.data)
1803  pfree(pstring);
1804  }
1805  else if (pformat == 1) /* binary mode */
1806  {
1807  Oid typreceive;
1808  Oid typioparam;
1809  StringInfo bufptr;
1810 
1811  /*
1812  * Call the parameter type's binary input converter
1813  */
1814  getTypeBinaryInputInfo(ptype, &typreceive, &typioparam);
1815 
1816  if (isNull)
1817  bufptr = NULL;
1818  else
1819  bufptr = &pbuf;
1820 
1821  pval = OidReceiveFunctionCall(typreceive, bufptr, typioparam, -1);
1822 
1823  /* Trouble if it didn't eat the whole buffer */
1824  if (!isNull && pbuf.cursor != pbuf.len)
1825  ereport(ERROR,
1826  (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
1827  errmsg("incorrect binary data format in bind parameter %d",
1828  paramno + 1)));
1829  }
1830  else
1831  {
1832  ereport(ERROR,
1833  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1834  errmsg("unsupported format code: %d",
1835  pformat)));
1836  pval = 0; /* keep compiler quiet */
1837  }
1838 
1839  /* Restore message buffer contents */
1840  if (!isNull)
1841  pbuf.data[plength] = csave;
1842 
1843  params->params[paramno].value = pval;
1844  params->params[paramno].isnull = isNull;
1845 
1846  /*
1847  * We mark the params as CONST. This ensures that any custom plan
1848  * makes full use of the parameter values.
1849  */
1850  params->params[paramno].pflags = PARAM_FLAG_CONST;
1851  params->params[paramno].ptype = ptype;
1852  }
1853  }
1854  else
1855  params = NULL;
1856 
1857  /* Done storing stuff in portal's context */
1858  MemoryContextSwitchTo(oldContext);
1859 
1860  /* Get the result format codes */
1861  numRFormats = pq_getmsgint(input_message, 2);
1862  if (numRFormats > 0)
1863  {
1864  rformats = (int16 *) palloc(numRFormats * sizeof(int16));
1865  for (int i = 0; i < numRFormats; i++)
1866  rformats[i] = pq_getmsgint(input_message, 2);
1867  }
1868 
1869  pq_getmsgend(input_message);
1870 
1871  /*
1872  * Obtain a plan from the CachedPlanSource. Any cruft from (re)planning
1873  * will be generated in MessageContext. The plan refcount will be
1874  * assigned to the Portal, so it will be released at portal destruction.
1875  */
1876  cplan = GetCachedPlan(psrc, params, false, NULL);
1877 
1878  /*
1879  * Now we can define the portal.
1880  *
1881  * DO NOT put any code that could possibly throw an error between the
1882  * above GetCachedPlan call and here.
1883  */
1884  PortalDefineQuery(portal,
1885  saved_stmt_name,
1886  query_string,
1887  psrc->commandTag,
1888  cplan->stmt_list,
1889  cplan);
1890 
1891  /* Done with the snapshot used for parameter I/O and parsing/planning */
1892  if (snapshot_set)
1894 
1895  /*
1896  * And we're ready to start portal execution.
1897  */
1898  PortalStart(portal, params, 0, InvalidSnapshot);
1899 
1900  /*
1901  * Apply the result format requests to the portal.
1902  */
1903  PortalSetResultFormat(portal, numRFormats, rformats);
1904 
1905  /*
1906  * Send BindComplete.
1907  */
1909  pq_putemptymessage('2');
1910 
1911  /*
1912  * Emit duration logging if appropriate.
1913  */
1914  switch (check_log_duration(msec_str, false))
1915  {
1916  case 1:
1917  ereport(LOG,
1918  (errmsg("duration: %s ms", msec_str),
1919  errhidestmt(true)));
1920  break;
1921  case 2:
1922  ereport(LOG,
1923  (errmsg("duration: %s ms bind %s%s%s: %s",
1924  msec_str,
1925  *stmt_name ? stmt_name : "<unnamed>",
1926  *portal_name ? "/" : "",
1927  *portal_name ? portal_name : "",
1928  psrc->query_string),
1929  errhidestmt(true),
1930  errdetail_params(params)));
1931  break;
1932  }
1933 
1934  if (save_log_statement_stats)
1935  ShowUsage("BIND MESSAGE STATISTICS");
1936 
1937  debug_query_string = NULL;
1938 }
1939 
1940 /*
1941  * exec_execute_message
1942  *
1943  * Process an "Execute" message for a portal
1944  */
1945 static void
1946 exec_execute_message(const char *portal_name, long max_rows)
1947 {
1948  CommandDest dest;
1949  DestReceiver *receiver;
1950  Portal portal;
1951  bool completed;
1952  char completionTag[COMPLETION_TAG_BUFSIZE];
1953  const char *sourceText;
1954  const char *prepStmtName;
1955  ParamListInfo portalParams;
1956  bool save_log_statement_stats = log_statement_stats;
1957  bool is_xact_command;
1958  bool execute_is_fetch;
1959  bool was_logged = false;
1960  char msec_str[32];
1961 
1962  /* Adjust destination to tell printtup.c what to do */
1963  dest = whereToSendOutput;
1964  if (dest == DestRemote)
1965  dest = DestRemoteExecute;
1966 
1967  portal = GetPortalByName(portal_name);
1968  if (!PortalIsValid(portal))
1969  ereport(ERROR,
1970  (errcode(ERRCODE_UNDEFINED_CURSOR),
1971  errmsg("portal \"%s\" does not exist", portal_name)));
1972 
1973  /*
1974  * If the original query was a null string, just return
1975  * EmptyQueryResponse.
1976  */
1977  if (portal->commandTag == NULL)
1978  {
1979  Assert(portal->stmts == NIL);
1980  NullCommand(dest);
1981  return;
1982  }
1983 
1984  /* Does the portal contain a transaction command? */
1985  is_xact_command = IsTransactionStmtList(portal->stmts);
1986 
1987  /*
1988  * We must copy the sourceText and prepStmtName into MessageContext in
1989  * case the portal is destroyed during finish_xact_command. Can avoid the
1990  * copy if it's not an xact command, though.
1991  */
1992  if (is_xact_command)
1993  {
1994  sourceText = pstrdup(portal->sourceText);
1995  if (portal->prepStmtName)
1996  prepStmtName = pstrdup(portal->prepStmtName);
1997  else
1998  prepStmtName = "<unnamed>";
1999 
2000  /*
2001  * An xact command shouldn't have any parameters, which is a good
2002  * thing because they wouldn't be around after finish_xact_command.
2003  */
2004  portalParams = NULL;
2005  }
2006  else
2007  {
2008  sourceText = portal->sourceText;
2009  if (portal->prepStmtName)
2010  prepStmtName = portal->prepStmtName;
2011  else
2012  prepStmtName = "<unnamed>";
2013  portalParams = portal->portalParams;
2014  }
2015 
2016  /*
2017  * Report query to various monitoring facilities.
2018  */
2019  debug_query_string = sourceText;
2020 
2022 
2023  set_ps_display(portal->commandTag, false);
2024 
2025  if (save_log_statement_stats)
2026  ResetUsage();
2027 
2028  BeginCommand(portal->commandTag, dest);
2029 
2030  /*
2031  * Create dest receiver in MessageContext (we don't want it in transaction
2032  * context, because that may get deleted if portal contains VACUUM).
2033  */
2034  receiver = CreateDestReceiver(dest);
2035  if (dest == DestRemoteExecute)
2036  SetRemoteDestReceiverParams(receiver, portal);
2037 
2038  /*
2039  * Ensure we are in a transaction command (this should normally be the
2040  * case already due to prior BIND).
2041  */
2043 
2044  /*
2045  * If we re-issue an Execute protocol request against an existing portal,
2046  * then we are only fetching more rows rather than completely re-executing
2047  * the query from the start. atStart is never reset for a v3 portal, so we
2048  * are safe to use this check.
2049  */
2050  execute_is_fetch = !portal->atStart;
2051 
2052  /* Log immediately if dictated by log_statement */
2053  if (check_log_statement(portal->stmts))
2054  {
2055  ereport(LOG,
2056  (errmsg("%s %s%s%s: %s",
2057  execute_is_fetch ?
2058  _("execute fetch from") :
2059  _("execute"),
2060  prepStmtName,
2061  *portal_name ? "/" : "",
2062  *portal_name ? portal_name : "",
2063  sourceText),
2064  errhidestmt(true),
2065  errdetail_params(portalParams)));
2066  was_logged = true;
2067  }
2068 
2069  /*
2070  * If we are in aborted transaction state, the only portals we can
2071  * actually run are those containing COMMIT or ROLLBACK commands.
2072  */
2074  !IsTransactionExitStmtList(portal->stmts))
2075  ereport(ERROR,
2076  (errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
2077  errmsg("current transaction is aborted, "
2078  "commands ignored until end of transaction block"),
2079  errdetail_abort()));
2080 
2081  /* Check for cancel signal before we start execution */
2083 
2084  /*
2085  * Okay to run the portal.
2086  */
2087  if (max_rows <= 0)
2088  max_rows = FETCH_ALL;
2089 
2090  completed = PortalRun(portal,
2091  max_rows,
2092  true, /* always top level */
2093  !execute_is_fetch && max_rows == FETCH_ALL,
2094  receiver,
2095  receiver,
2096  completionTag);
2097 
2098  receiver->rDestroy(receiver);
2099 
2100  if (completed)
2101  {
2102  if (is_xact_command)
2103  {
2104  /*
2105  * If this was a transaction control statement, commit it. We
2106  * will start a new xact command for the next command (if any).
2107  */
2109  }
2110  else
2111  {
2112  /*
2113  * We need a CommandCounterIncrement after every query, except
2114  * those that start or end a transaction block.
2115  */
2117 
2118  /* full command has been executed, reset timeout */
2120  }
2121 
2122  /* Send appropriate CommandComplete to client */
2123  EndCommand(completionTag, dest);
2124  }
2125  else
2126  {
2127  /* Portal run not complete, so send PortalSuspended */
2129  pq_putemptymessage('s');
2130  }
2131 
2132  /*
2133  * Emit duration logging if appropriate.
2134  */
2135  switch (check_log_duration(msec_str, was_logged))
2136  {
2137  case 1:
2138  ereport(LOG,
2139  (errmsg("duration: %s ms", msec_str),
2140  errhidestmt(true)));
2141  break;
2142  case 2:
2143  ereport(LOG,
2144  (errmsg("duration: %s ms %s %s%s%s: %s",
2145  msec_str,
2146  execute_is_fetch ?
2147  _("execute fetch from") :
2148  _("execute"),
2149  prepStmtName,
2150  *portal_name ? "/" : "",
2151  *portal_name ? portal_name : "",
2152  sourceText),
2153  errhidestmt(true),
2154  errdetail_params(portalParams)));
2155  break;
2156  }
2157 
2158  if (save_log_statement_stats)
2159  ShowUsage("EXECUTE MESSAGE STATISTICS");
2160 
2161  debug_query_string = NULL;
2162 }
2163 
2164 /*
2165  * check_log_statement
2166  * Determine whether command should be logged because of log_statement
2167  *
2168  * stmt_list can be either raw grammar output or a list of planned
2169  * statements
2170  */
2171 static bool
2173 {
2174  ListCell *stmt_item;
2175 
2176  if (log_statement == LOGSTMT_NONE)
2177  return false;
2178  if (log_statement == LOGSTMT_ALL)
2179  return true;
2180 
2181  /* Else we have to inspect the statement(s) to see whether to log */
2182  foreach(stmt_item, stmt_list)
2183  {
2184  Node *stmt = (Node *) lfirst(stmt_item);
2185 
2186  if (GetCommandLogLevel(stmt) <= log_statement)
2187  return true;
2188  }
2189 
2190  return false;
2191 }
2192 
2193 /*
2194  * check_log_duration
2195  * Determine whether current command's duration should be logged.
2196  * If log_statement_sample_rate < 1.0, log only a sample.
2197  * We also check if this statement in this transaction must be logged
2198  * (regardless of its duration).
2199  *
2200  * Returns:
2201  * 0 if no logging is needed
2202  * 1 if just the duration should be logged
2203  * 2 if duration and query details should be logged
2204  *
2205  * If logging is needed, the duration in msec is formatted into msec_str[],
2206  * which must be a 32-byte buffer.
2207  *
2208  * was_logged should be true if caller already logged query details (this
2209  * essentially prevents 2 from being returned).
2210  */
2211 int
2212 check_log_duration(char *msec_str, bool was_logged)
2213 {
2215  {
2216  long secs;
2217  int usecs;
2218  int msecs;
2219  bool exceeded;
2220  bool in_sample;
2221 
2224  &secs, &usecs);
2225  msecs = usecs / 1000;
2226 
2227  /*
2228  * This odd-looking test for log_min_duration_statement being exceeded
2229  * is designed to avoid integer overflow with very long durations:
2230  * don't compute secs * 1000 until we've verified it will fit in int.
2231  */
2232  exceeded = (log_min_duration_statement == 0 ||
2234  (secs > log_min_duration_statement / 1000 ||
2235  secs * 1000 + msecs >= log_min_duration_statement)));
2236 
2237  /*
2238  * Do not log if log_statement_sample_rate = 0. Log a sample if
2239  * log_statement_sample_rate <= 1 and avoid unnecessary random() call
2240  * if log_statement_sample_rate = 1. But don't compute any of this
2241  * unless needed.
2242  */
2243  in_sample = exceeded &&
2245  (log_statement_sample_rate == 1 ||
2247 
2248  if ((exceeded && in_sample) || log_duration || xact_is_sampled)
2249  {
2250  snprintf(msec_str, 32, "%ld.%03d",
2251  secs * 1000 + msecs, usecs % 1000);
2252  if ((exceeded || xact_is_sampled) && !was_logged)
2253  return 2;
2254  else
2255  return 1;
2256  }
2257  }
2258 
2259  return 0;
2260 }
2261 
2262 /*
2263  * errdetail_execute
2264  *
2265  * Add an errdetail() line showing the query referenced by an EXECUTE, if any.
2266  * The argument is the raw parsetree list.
2267  */
2268 static int
2269 errdetail_execute(List *raw_parsetree_list)
2270 {
2271  ListCell *parsetree_item;
2272 
2273  foreach(parsetree_item, raw_parsetree_list)
2274  {
2275  RawStmt *parsetree = lfirst_node(RawStmt, parsetree_item);
2276 
2277  if (IsA(parsetree->stmt, ExecuteStmt))
2278  {
2279  ExecuteStmt *stmt = (ExecuteStmt *) parsetree->stmt;
2280  PreparedStatement *pstmt;
2281 
2282  pstmt = FetchPreparedStatement(stmt->name, false);
2283  if (pstmt)
2284  {
2285  errdetail("prepare: %s", pstmt->plansource->query_string);
2286  return 0;
2287  }
2288  }
2289  }
2290 
2291  return 0;
2292 }
2293 
2294 /*
2295  * errdetail_params
2296  *
2297  * Add an errdetail() line showing bind-parameter data, if available.
2298  */
2299 static int
2301 {
2302  /* We mustn't call user-defined I/O functions when in an aborted xact */
2303  if (params && params->numParams > 0 && !IsAbortedTransactionBlockState())
2304  {
2305  StringInfoData param_str;
2306  MemoryContext oldcontext;
2307 
2308  /* This code doesn't support dynamic param lists */
2309  Assert(params->paramFetch == NULL);
2310 
2311  /* Make sure any trash is generated in MessageContext */
2312  oldcontext = MemoryContextSwitchTo(MessageContext);
2313 
2314  initStringInfo(&param_str);
2315 
2316  for (int paramno = 0; paramno < params->numParams; paramno++)
2317  {
2318  ParamExternData *prm = &params->params[paramno];
2319  Oid typoutput;
2320  bool typisvarlena;
2321  char *pstring;
2322  char *p;
2323 
2324  appendStringInfo(&param_str, "%s$%d = ",
2325  paramno > 0 ? ", " : "",
2326  paramno + 1);
2327 
2328  if (prm->isnull || !OidIsValid(prm->ptype))
2329  {
2330  appendStringInfoString(&param_str, "NULL");
2331  continue;
2332  }
2333 
2334  getTypeOutputInfo(prm->ptype, &typoutput, &typisvarlena);
2335 
2336  pstring = OidOutputFunctionCall(typoutput, prm->value);
2337 
2338  appendStringInfoCharMacro(&param_str, '\'');
2339  for (p = pstring; *p; p++)
2340  {
2341  if (*p == '\'') /* double single quotes */
2342  appendStringInfoCharMacro(&param_str, *p);
2343  appendStringInfoCharMacro(&param_str, *p);
2344  }
2345  appendStringInfoCharMacro(&param_str, '\'');
2346 
2347  pfree(pstring);
2348  }
2349 
2350  errdetail("parameters: %s", param_str.data);
2351 
2352  pfree(param_str.data);
2353 
2354  MemoryContextSwitchTo(oldcontext);
2355  }
2356 
2357  return 0;
2358 }
2359 
2360 /*
2361  * errdetail_abort
2362  *
2363  * Add an errdetail() line showing abort reason, if any.
2364  */
2365 static int
2367 {
2369  errdetail("abort reason: recovery conflict");
2370 
2371  return 0;
2372 }
2373 
2374 /*
2375  * errdetail_recovery_conflict
2376  *
2377  * Add an errdetail() line showing conflict source.
2378  */
2379 static int
2381 {
2382  switch (RecoveryConflictReason)
2383  {
2385  errdetail("User was holding shared buffer pin for too long.");
2386  break;
2388  errdetail("User was holding a relation lock for too long.");
2389  break;
2391  errdetail("User was or might have been using tablespace that must be dropped.");
2392  break;
2394  errdetail("User query might have needed to see row versions that must be removed.");
2395  break;
2397  errdetail("User transaction caused buffer deadlock with recovery.");
2398  break;
2400  errdetail("User was connected to a database that must be dropped.");
2401  break;
2402  default:
2403  break;
2404  /* no errdetail */
2405  }
2406 
2407  return 0;
2408 }
2409 
2410 /*
2411  * exec_describe_statement_message
2412  *
2413  * Process a "Describe" message for a prepared statement
2414  */
2415 static void
2416 exec_describe_statement_message(const char *stmt_name)
2417 {
2418  CachedPlanSource *psrc;
2419 
2420  /*
2421  * Start up a transaction command. (Note that this will normally change
2422  * current memory context.) Nothing happens if we are already in one.
2423  */
2425 
2426  /* Switch back to message context */
2428 
2429  /* Find prepared statement */
2430  if (stmt_name[0] != '\0')
2431  {
2432  PreparedStatement *pstmt;
2433 
2434  pstmt = FetchPreparedStatement(stmt_name, true);
2435  psrc = pstmt->plansource;
2436  }
2437  else
2438  {
2439  /* special-case the unnamed statement */
2440  psrc = unnamed_stmt_psrc;
2441  if (!psrc)
2442  ereport(ERROR,
2443  (errcode(ERRCODE_UNDEFINED_PSTATEMENT),
2444  errmsg("unnamed prepared statement does not exist")));
2445  }
2446 
2447  /* Prepared statements shouldn't have changeable result descs */
2448  Assert(psrc->fixed_result);
2449 
2450  /*
2451  * If we are in aborted transaction state, we can't run
2452  * SendRowDescriptionMessage(), because that needs catalog accesses.
2453  * Hence, refuse to Describe statements that return data. (We shouldn't
2454  * just refuse all Describes, since that might break the ability of some
2455  * clients to issue COMMIT or ROLLBACK commands, if they use code that
2456  * blindly Describes whatever it does.) We can Describe parameters
2457  * without doing anything dangerous, so we don't restrict that.
2458  */
2460  psrc->resultDesc)
2461  ereport(ERROR,
2462  (errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
2463  errmsg("current transaction is aborted, "
2464  "commands ignored until end of transaction block"),
2465  errdetail_abort()));
2466 
2468  return; /* can't actually do anything... */
2469 
2470  /*
2471  * First describe the parameters...
2472  */
2473  pq_beginmessage_reuse(&row_description_buf, 't'); /* parameter description
2474  * message type */
2475  pq_sendint16(&row_description_buf, psrc->num_params);
2476 
2477  for (int i = 0; i < psrc->num_params; i++)
2478  {
2479  Oid ptype = psrc->param_types[i];
2480 
2481  pq_sendint32(&row_description_buf, (int) ptype);
2482  }
2483  pq_endmessage_reuse(&row_description_buf);
2484 
2485  /*
2486  * Next send RowDescription or NoData to describe the result...
2487  */
2488  if (psrc->resultDesc)
2489  {
2490  List *tlist;
2491 
2492  /* Get the plan's primary targetlist */
2493  tlist = CachedPlanGetTargetList(psrc, NULL);
2494 
2495  SendRowDescriptionMessage(&row_description_buf,
2496  psrc->resultDesc,
2497  tlist,
2498  NULL);
2499  }
2500  else
2501  pq_putemptymessage('n'); /* NoData */
2502 
2503 }
2504 
2505 /*
2506  * exec_describe_portal_message
2507  *
2508  * Process a "Describe" message for a portal
2509  */
2510 static void
2511 exec_describe_portal_message(const char *portal_name)
2512 {
2513  Portal portal;
2514 
2515  /*
2516  * Start up a transaction command. (Note that this will normally change
2517  * current memory context.) Nothing happens if we are already in one.
2518  */
2520 
2521  /* Switch back to message context */
2523 
2524  portal = GetPortalByName(portal_name);
2525  if (!PortalIsValid(portal))
2526  ereport(ERROR,
2527  (errcode(ERRCODE_UNDEFINED_CURSOR),
2528  errmsg("portal \"%s\" does not exist", portal_name)));
2529 
2530  /*
2531  * If we are in aborted transaction state, we can't run
2532  * SendRowDescriptionMessage(), because that needs catalog accesses.
2533  * Hence, refuse to Describe portals that return data. (We shouldn't just
2534  * refuse all Describes, since that might break the ability of some
2535  * clients to issue COMMIT or ROLLBACK commands, if they use code that
2536  * blindly Describes whatever it does.)
2537  */
2539  portal->tupDesc)
2540  ereport(ERROR,
2541  (errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
2542  errmsg("current transaction is aborted, "
2543  "commands ignored until end of transaction block"),
2544  errdetail_abort()));
2545 
2547  return; /* can't actually do anything... */
2548 
2549  if (portal->tupDesc)
2550  SendRowDescriptionMessage(&row_description_buf,
2551  portal->tupDesc,
2552  FetchPortalTargetList(portal),
2553  portal->formats);
2554  else
2555  pq_putemptymessage('n'); /* NoData */
2556 }
2557 
2558 
2559 /*
2560  * Convenience routines for starting/committing a single command.
2561  */
2562 static void
2564 {
2565  if (!xact_started)
2566  {
2568 
2569  xact_started = true;
2570  }
2571 
2572  /*
2573  * Start statement timeout if necessary. Note that this'll intentionally
2574  * not reset the clock on an already started timeout, to avoid the timing
2575  * overhead when start_xact_command() is invoked repeatedly, without an
2576  * interceding finish_xact_command() (e.g. parse/bind/execute). If that's
2577  * not desired, the timeout has to be disabled explicitly.
2578  */
2580 }
2581 
2582 static void
2584 {
2585  /* cancel active statement timeout after each command */
2587 
2588  if (xact_started)
2589  {
2591 
2592 #ifdef MEMORY_CONTEXT_CHECKING
2593  /* Check all memory contexts that weren't freed during commit */
2594  /* (those that were, were checked before being deleted) */
2595  MemoryContextCheck(TopMemoryContext);
2596 #endif
2597 
2598 #ifdef SHOW_MEMORY_STATS
2599  /* Print mem stats after each commit for leak tracking */
2601 #endif
2602 
2603  xact_started = false;
2604  }
2605 }
2606 
2607 
2608 /*
2609  * Convenience routines for checking whether a statement is one of the
2610  * ones that we allow in transaction-aborted state.
2611  */
2612 
2613 /* Test a bare parsetree */
2614 static bool
2616 {
2617  if (parsetree && IsA(parsetree, TransactionStmt))
2618  {
2619  TransactionStmt *stmt = (TransactionStmt *) parsetree;
2620 
2621  if (stmt->kind == TRANS_STMT_COMMIT ||
2622  stmt->kind == TRANS_STMT_PREPARE ||
2623  stmt->kind == TRANS_STMT_ROLLBACK ||
2624  stmt->kind == TRANS_STMT_ROLLBACK_TO)
2625  return true;
2626  }
2627  return false;
2628 }
2629 
2630 /* Test a list that contains PlannedStmt nodes */
2631 static bool
2633 {
2634  if (list_length(pstmts) == 1)
2635  {
2636  PlannedStmt *pstmt = linitial_node(PlannedStmt, pstmts);
2637 
2638  if (pstmt->commandType == CMD_UTILITY &&
2640  return true;
2641  }
2642  return false;
2643 }
2644 
2645 /* Test a list that contains PlannedStmt nodes */
2646 static bool
2648 {
2649  if (list_length(pstmts) == 1)
2650  {
2651  PlannedStmt *pstmt = linitial_node(PlannedStmt, pstmts);
2652 
2653  if (pstmt->commandType == CMD_UTILITY &&
2654  IsA(pstmt->utilityStmt, TransactionStmt))
2655  return true;
2656  }
2657  return false;
2658 }
2659 
2660 /* Release any existing unnamed prepared statement */
2661 static void
2663 {
2664  /* paranoia to avoid a dangling pointer in case of error */
2665  if (unnamed_stmt_psrc)
2666  {
2668 
2669  unnamed_stmt_psrc = NULL;
2670  DropCachedPlan(psrc);
2671  }
2672 }
2673 
2674 
2675 /* --------------------------------
2676  * signal handler routines used in PostgresMain()
2677  * --------------------------------
2678  */
2679 
2680 /*
2681  * quickdie() occurs when signalled SIGQUIT by the postmaster.
2682  *
2683  * Some backend has bought the farm,
2684  * so we need to stop what we're doing and exit.
2685  */
2686 void
2688 {
2689  sigaddset(&BlockSig, SIGQUIT); /* prevent nested calls */
2690  PG_SETMASK(&BlockSig);
2691 
2692  /*
2693  * Prevent interrupts while exiting; though we just blocked signals that
2694  * would queue new interrupts, one may have been pending. We don't want a
2695  * quickdie() downgraded to a mere query cancel.
2696  */
2697  HOLD_INTERRUPTS();
2698 
2699  /*
2700  * If we're aborting out of client auth, don't risk trying to send
2701  * anything to the client; we will likely violate the protocol, not to
2702  * mention that we may have interrupted the guts of OpenSSL or some
2703  * authentication library.
2704  */
2707 
2708  /*
2709  * Notify the client before exiting, to give a clue on what happened.
2710  *
2711  * It's dubious to call ereport() from a signal handler. It is certainly
2712  * not async-signal safe. But it seems better to try, than to disconnect
2713  * abruptly and leave the client wondering what happened. It's remotely
2714  * possible that we crash or hang while trying to send the message, but
2715  * receiving a SIGQUIT is a sign that something has already gone badly
2716  * wrong, so there's not much to lose. Assuming the postmaster is still
2717  * running, it will SIGKILL us soon if we get stuck for some reason.
2718  *
2719  * Ideally this should be ereport(FATAL), but then we'd not get control
2720  * back...
2721  */
2722  ereport(WARNING,
2723  (errcode(ERRCODE_CRASH_SHUTDOWN),
2724  errmsg("terminating connection because of crash of another server process"),
2725  errdetail("The postmaster has commanded this server process to roll back"
2726  " the current transaction and exit, because another"
2727  " server process exited abnormally and possibly corrupted"
2728  " shared memory."),
2729  errhint("In a moment you should be able to reconnect to the"
2730  " database and repeat your command.")));
2731 
2732  /*
2733  * We DO NOT want to run proc_exit() or atexit() callbacks -- we're here
2734  * because shared memory may be corrupted, so we don't want to try to
2735  * clean up our transaction. Just nail the windows shut and get out of
2736  * town. The callbacks wouldn't be safe to run from a signal handler,
2737  * anyway.
2738  *
2739  * Note we do _exit(2) not _exit(0). This is to force the postmaster into
2740  * a system reset cycle if someone sends a manual SIGQUIT to a random
2741  * backend. This is necessary precisely because we don't clean up our
2742  * shared memory state. (The "dead man switch" mechanism in pmsignal.c
2743  * should ensure the postmaster sees this as a crash, too, but no harm in
2744  * being doubly sure.)
2745  */
2746  _exit(2);
2747 }
2748 
2749 /*
2750  * Shutdown signal from postmaster: abort transaction and exit
2751  * at soonest convenient time
2752  */
2753 void
2755 {
2756  int save_errno = errno;
2757 
2758  /* Don't joggle the elbow of proc_exit */
2759  if (!proc_exit_inprogress)
2760  {
2761  InterruptPending = true;
2762  ProcDiePending = true;
2763  }
2764 
2765  /* If we're still here, waken anything waiting on the process latch */
2766  SetLatch(MyLatch);
2767 
2768  /*
2769  * If we're in single user mode, we want to quit immediately - we can't
2770  * rely on latches as they wouldn't work when stdin/stdout is a file.
2771  * Rather ugly, but it's unlikely to be worthwhile to invest much more
2772  * effort just for the benefit of single user mode.
2773  */
2776 
2777  errno = save_errno;
2778 }
2779 
2780 /*
2781  * Query-cancel signal from postmaster: abort current transaction
2782  * at soonest convenient time
2783  */
2784 void
2786 {
2787  int save_errno = errno;
2788 
2789  /*
2790  * Don't joggle the elbow of proc_exit
2791  */
2792  if (!proc_exit_inprogress)
2793  {
2794  InterruptPending = true;
2795  QueryCancelPending = true;
2796  }
2797 
2798  /* If we're still here, waken anything waiting on the process latch */
2799  SetLatch(MyLatch);
2800 
2801  errno = save_errno;
2802 }
2803 
2804 /* signal handler for floating point exception */
2805 void
2807 {
2808  /* We're not returning, so no need to save errno */
2809  ereport(ERROR,
2810  (errcode(ERRCODE_FLOATING_POINT_EXCEPTION),
2811  errmsg("floating-point exception"),
2812  errdetail("An invalid floating-point operation was signaled. "
2813  "This probably means an out-of-range result or an "
2814  "invalid operation, such as division by zero.")));
2815 }
2816 
2817 /*
2818  * SIGHUP: set flag to re-read config file at next convenient time.
2819  *
2820  * Sets the ConfigReloadPending flag, which should be checked at convenient
2821  * places inside main loops. (Better than doing the reading in the signal
2822  * handler, ey?)
2823  */
2824 void
2826 {
2827  int save_errno = errno;
2828 
2829  ConfigReloadPending = true;
2830  SetLatch(MyLatch);
2831 
2832  errno = save_errno;
2833 }
2834 
2835 /*
2836  * RecoveryConflictInterrupt: out-of-line portion of recovery conflict
2837  * handling following receipt of SIGUSR1. Designed to be similar to die()
2838  * and StatementCancelHandler(). Called only by a normal user backend
2839  * that begins a transaction during recovery.
2840  */
2841 void
2843 {
2844  int save_errno = errno;
2845 
2846  /*
2847  * Don't joggle the elbow of proc_exit
2848  */
2849  if (!proc_exit_inprogress)
2850  {
2851  RecoveryConflictReason = reason;
2852  switch (reason)
2853  {
2855 
2856  /*
2857  * If we aren't waiting for a lock we can never deadlock.
2858  */
2859  if (!IsWaitingForLock())
2860  return;
2861 
2862  /* Intentional fall through to check wait for pin */
2863  /* FALLTHROUGH */
2864 
2866 
2867  /*
2868  * If we aren't blocking the Startup process there is nothing
2869  * more to do.
2870  */
2872  return;
2873 
2875 
2876  /* Intentional fall through to error handling */
2877  /* FALLTHROUGH */
2878 
2882 
2883  /*
2884  * If we aren't in a transaction any longer then ignore.
2885  */
2887  return;
2888 
2889  /*
2890  * If we can abort just the current subtransaction then we are
2891  * OK to throw an ERROR to resolve the conflict. Otherwise
2892  * drop through to the FATAL case.
2893  *
2894  * XXX other times that we can throw just an ERROR *may* be
2895  * PROCSIG_RECOVERY_CONFLICT_LOCK if no locks are held in
2896  * parent transactions
2897  *
2898  * PROCSIG_RECOVERY_CONFLICT_SNAPSHOT if no snapshots are held
2899  * by parent transactions and the transaction is not
2900  * transaction-snapshot mode
2901  *
2902  * PROCSIG_RECOVERY_CONFLICT_TABLESPACE if no temp files or
2903  * cursors open in parent transactions
2904  */
2905  if (!IsSubTransaction())
2906  {
2907  /*
2908  * If we already aborted then we no longer need to cancel.
2909  * We do this here since we do not wish to ignore aborted
2910  * subtransactions, which must cause FATAL, currently.
2911  */
2913  return;
2914 
2915  RecoveryConflictPending = true;
2916  QueryCancelPending = true;
2917  InterruptPending = true;
2918  break;
2919  }
2920 
2921  /* Intentional fall through to session cancel */
2922  /* FALLTHROUGH */
2923 
2925  RecoveryConflictPending = true;
2926  ProcDiePending = true;
2927  InterruptPending = true;
2928  break;
2929 
2930  default:
2931  elog(FATAL, "unrecognized conflict mode: %d",
2932  (int) reason);
2933  }
2934 
2936 
2937  /*
2938  * All conflicts apart from database cause dynamic errors where the
2939  * command or transaction can be retried at a later point with some
2940  * potential for success. No need to reset this, since non-retryable
2941  * conflict errors are currently FATAL.
2942  */
2943  if (reason == PROCSIG_RECOVERY_CONFLICT_DATABASE)
2944  RecoveryConflictRetryable = false;
2945  }
2946 
2947  /*
2948  * Set the process latch. This function essentially emulates signal
2949  * handlers like die() and StatementCancelHandler() and it seems prudent
2950  * to behave similarly as they do.
2951  */
2952  SetLatch(MyLatch);
2953 
2954  errno = save_errno;
2955 }
2956 
2957 /*
2958  * ProcessInterrupts: out-of-line portion of CHECK_FOR_INTERRUPTS() macro
2959  *
2960  * If an interrupt condition is pending, and it's safe to service it,
2961  * then clear the flag and accept the interrupt. Called only when
2962  * InterruptPending is true.
2963  */
2964 void
2966 {
2967  /* OK to accept any interrupts now? */
2968  if (InterruptHoldoffCount != 0 || CritSectionCount != 0)
2969  return;
2970  InterruptPending = false;
2971 
2972  if (ProcDiePending)
2973  {
2974  ProcDiePending = false;
2975  QueryCancelPending = false; /* ProcDie trumps QueryCancel */
2976  LockErrorCleanup();
2977  /* As in quickdie, don't risk sending to client during auth */
2981  ereport(FATAL,
2982  (errcode(ERRCODE_QUERY_CANCELED),
2983  errmsg("canceling authentication due to timeout")));
2984  else if (IsAutoVacuumWorkerProcess())
2985  ereport(FATAL,
2986  (errcode(ERRCODE_ADMIN_SHUTDOWN),
2987  errmsg("terminating autovacuum process due to administrator command")));
2988  else if (IsLogicalWorker())
2989  ereport(FATAL,
2990  (errcode(ERRCODE_ADMIN_SHUTDOWN),
2991  errmsg("terminating logical replication worker due to administrator command")));
2992  else if (IsLogicalLauncher())
2993  {
2994  ereport(DEBUG1,
2995  (errmsg("logical replication launcher shutting down")));
2996 
2997  /*
2998  * The logical replication launcher can be stopped at any time.
2999  * Use exit status 1 so the background worker is restarted.
3000  */
3001  proc_exit(1);
3002  }
3004  {
3006  ereport(FATAL,
3007  (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
3008  errmsg("terminating connection due to conflict with recovery"),
3010  }
3011  else if (RecoveryConflictPending)
3012  {
3013  /* Currently there is only one non-retryable recovery conflict */
3016  ereport(FATAL,
3017  (errcode(ERRCODE_DATABASE_DROPPED),
3018  errmsg("terminating connection due to conflict with recovery"),
3020  }
3021  else
3022  ereport(FATAL,
3023  (errcode(ERRCODE_ADMIN_SHUTDOWN),
3024  errmsg("terminating connection due to administrator command")));
3025  }
3027  {
3028  QueryCancelPending = false; /* lost connection trumps QueryCancel */
3029  LockErrorCleanup();
3030  /* don't send to client, we already know the connection to be dead. */
3032  ereport(FATAL,
3033  (errcode(ERRCODE_CONNECTION_FAILURE),
3034  errmsg("connection to client lost")));
3035  }
3036 
3037  /*
3038  * If a recovery conflict happens while we are waiting for input from the
3039  * client, the client is presumably just sitting idle in a transaction,
3040  * preventing recovery from making progress. Terminate the connection to
3041  * dislodge it.
3042  */
3044  {
3045  QueryCancelPending = false; /* this trumps QueryCancel */
3046  RecoveryConflictPending = false;
3047  LockErrorCleanup();
3049  ereport(FATAL,
3050  (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
3051  errmsg("terminating connection due to conflict with recovery"),
3053  errhint("In a moment you should be able to reconnect to the"
3054  " database and repeat your command.")));
3055  }
3056 
3057  /*
3058  * Don't allow query cancel interrupts while reading input from the
3059  * client, because we might lose sync in the FE/BE protocol. (Die
3060  * interrupts are OK, because we won't read any further messages from the
3061  * client in that case.)
3062  */
3064  {
3065  /*
3066  * Re-arm InterruptPending so that we process the cancel request as
3067  * soon as we're done reading the message.
3068  */
3069  InterruptPending = true;
3070  }
3071  else if (QueryCancelPending)
3072  {
3073  bool lock_timeout_occurred;
3074  bool stmt_timeout_occurred;
3075 
3076  QueryCancelPending = false;
3077 
3078  /*
3079  * If LOCK_TIMEOUT and STATEMENT_TIMEOUT indicators are both set, we
3080  * need to clear both, so always fetch both.
3081  */
3082  lock_timeout_occurred = get_timeout_indicator(LOCK_TIMEOUT, true);
3083  stmt_timeout_occurred = get_timeout_indicator(STATEMENT_TIMEOUT, true);
3084 
3085  /*
3086  * If both were set, we want to report whichever timeout completed
3087  * earlier; this ensures consistent behavior if the machine is slow
3088  * enough that the second timeout triggers before we get here. A tie
3089  * is arbitrarily broken in favor of reporting a lock timeout.
3090  */
3091  if (lock_timeout_occurred && stmt_timeout_occurred &&
3093  lock_timeout_occurred = false; /* report stmt timeout */
3094 
3095  if (lock_timeout_occurred)
3096  {
3097  LockErrorCleanup();
3098  ereport(ERROR,
3099  (errcode(ERRCODE_LOCK_NOT_AVAILABLE),
3100  errmsg("canceling statement due to lock timeout")));
3101  }
3102  if (stmt_timeout_occurred)
3103  {
3104  LockErrorCleanup();
3105  ereport(ERROR,
3106  (errcode(ERRCODE_QUERY_CANCELED),
3107  errmsg("canceling statement due to statement timeout")));
3108  }
3110  {
3111  LockErrorCleanup();
3112  ereport(ERROR,
3113  (errcode(ERRCODE_QUERY_CANCELED),
3114  errmsg("canceling autovacuum task")));
3115  }
3117  {
3118  RecoveryConflictPending = false;
3119  LockErrorCleanup();
3121  ereport(ERROR,
3122  (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
3123  errmsg("canceling statement due to conflict with recovery"),
3125  }
3126 
3127  /*
3128  * If we are reading a command from the client, just ignore the cancel
3129  * request --- sending an extra error message won't accomplish
3130  * anything. Otherwise, go ahead and throw the error.
3131  */
3132  if (!DoingCommandRead)
3133  {
3134  LockErrorCleanup();
3135  ereport(ERROR,
3136  (errcode(ERRCODE_QUERY_CANCELED),
3137  errmsg("canceling statement due to user request")));
3138  }
3139  }
3140 
3142  {
3143  /* Has the timeout setting changed since last we looked? */
3145  ereport(FATAL,
3146  (errcode(ERRCODE_IDLE_IN_TRANSACTION_SESSION_TIMEOUT),
3147  errmsg("terminating connection due to idle-in-transaction timeout")));
3148  else
3150 
3151  }
3152 
3155 }
3156 
3157 
3158 /*
3159  * IA64-specific code to fetch the AR.BSP register for stack depth checks.
3160  *
3161  * We currently support gcc, icc, and HP-UX's native compiler here.
3162  *
3163  * Note: while icc accepts gcc asm blocks on x86[_64], this is not true on
3164  * ia64 (at least not in icc versions before 12.x). So we have to carry a
3165  * separate implementation for it.
3166  */
3167 #if defined(__ia64__) || defined(__ia64)
3168 
3169 #if defined(__hpux) && !defined(__GNUC__) && !defined(__INTEL_COMPILER)
3170 /* Assume it's HP-UX native compiler */
3171 #include <ia64/sys/inline.h>
3172 #define ia64_get_bsp() ((char *) (_Asm_mov_from_ar(_AREG_BSP, _NO_FENCE)))
3173 #elif defined(__INTEL_COMPILER)
3174 /* icc */
3175 #include <asm/ia64regs.h>
3176 #define ia64_get_bsp() ((char *) __getReg(_IA64_REG_AR_BSP))
3177 #else
3178 /* gcc */
3179 static __inline__ char *
3180 ia64_get_bsp(void)
3181 {
3182  char *ret;
3183 
3184  /* the ;; is a "stop", seems to be required before fetching BSP */
3185  __asm__ __volatile__(
3186  ";;\n"
3187  " mov %0=ar.bsp \n"
3188 : "=r"(ret));
3189 
3190  return ret;
3191 }
3192 #endif
3193 #endif /* IA64 */
3194 
3195 
3196 /*
3197  * set_stack_base: set up reference point for stack depth checking
3198  *
3199  * Returns the old reference point, if any.
3200  */
3203 {
3204  char stack_base;
3205  pg_stack_base_t old;
3206 
3207 #if defined(__ia64__) || defined(__ia64)
3208  old.stack_base_ptr = stack_base_ptr;
3209  old.register_stack_base_ptr = register_stack_base_ptr;
3210 #else
3211  old = stack_base_ptr;
3212 #endif
3213 
3214  /* Set up reference point for stack depth checking */
3215  stack_base_ptr = &stack_base;
3216 #if defined(__ia64__) || defined(__ia64)
3217  register_stack_base_ptr = ia64_get_bsp();
3218 #endif
3219 
3220  return old;
3221 }
3222 
3223 /*
3224  * restore_stack_base: restore reference point for stack depth checking
3225  *
3226  * This can be used after set_stack_base() to restore the old value. This
3227  * is currently only used in PL/Java. When PL/Java calls a backend function
3228  * from different thread, the thread's stack is at a different location than
3229  * the main thread's stack, so it sets the base pointer before the call, and
3230  * restores it afterwards.
3231  */
3232 void
3234 {
3235 #if defined(__ia64__) || defined(__ia64)
3236  stack_base_ptr = base.stack_base_ptr;
3237  register_stack_base_ptr = base.register_stack_base_ptr;
3238 #else
3239  stack_base_ptr = base;
3240 #endif
3241 }
3242 
3243 /*
3244  * check_stack_depth/stack_is_too_deep: check for excessively deep recursion
3245  *
3246  * This should be called someplace in any recursive routine that might possibly
3247  * recurse deep enough to overflow the stack. Most Unixen treat stack
3248  * overflow as an unrecoverable SIGSEGV, so we want to error out ourselves
3249  * before hitting the hardware limit.
3250  *
3251  * check_stack_depth() just throws an error summarily. stack_is_too_deep()
3252  * can be used by code that wants to handle the error condition itself.
3253  */
3254 void
3256 {
3257  if (stack_is_too_deep())
3258  {
3259  ereport(ERROR,
3260  (errcode(ERRCODE_STATEMENT_TOO_COMPLEX),
3261  errmsg("stack depth limit exceeded"),
3262  errhint("Increase the configuration parameter \"max_stack_depth\" (currently %dkB), "
3263  "after ensuring the platform's stack depth limit is adequate.",
3264  max_stack_depth)));
3265  }
3266 }
3267 
3268 bool
3270 {
3271  char stack_top_loc;
3272  long stack_depth;
3273 
3274  /*
3275  * Compute distance from reference point to my local variables
3276  */
3277  stack_depth = (long) (stack_base_ptr - &stack_top_loc);
3278 
3279  /*
3280  * Take abs value, since stacks grow up on some machines, down on others
3281  */
3282  if (stack_depth < 0)
3283  stack_depth = -stack_depth;
3284 
3285  /*
3286  * Trouble?
3287  *
3288  * The test on stack_base_ptr prevents us from erroring out if called
3289  * during process setup or in a non-backend process. Logically it should
3290  * be done first, but putting it here avoids wasting cycles during normal
3291  * cases.
3292  */
3293  if (stack_depth > max_stack_depth_bytes &&
3294  stack_base_ptr != NULL)
3295  return true;
3296 
3297  /*
3298  * On IA64 there is a separate "register" stack that requires its own
3299  * independent check. For this, we have to measure the change in the
3300  * "BSP" pointer from PostgresMain to here. Logic is just as above,
3301  * except that we know IA64's register stack grows up.
3302  *
3303  * Note we assume that the same max_stack_depth applies to both stacks.
3304  */
3305 #if defined(__ia64__) || defined(__ia64)
3306  stack_depth = (long) (ia64_get_bsp() - register_stack_base_ptr);
3307 
3308  if (stack_depth > max_stack_depth_bytes &&
3309  register_stack_base_ptr != NULL)
3310  return true;
3311 #endif /* IA64 */
3312 
3313  return false;
3314 }
3315 
3316 /* GUC check hook for max_stack_depth */
3317 bool
3318 check_max_stack_depth(int *newval, void **extra, GucSource source)
3319 {
3320  long newval_bytes = *newval * 1024L;
3321  long stack_rlimit = get_stack_depth_rlimit();
3322 
3323  if (stack_rlimit > 0 && newval_bytes > stack_rlimit - STACK_DEPTH_SLOP)
3324  {
3325  GUC_check_errdetail("\"max_stack_depth\" must not exceed %ldkB.",
3326  (stack_rlimit - STACK_DEPTH_SLOP) / 1024L);
3327  GUC_check_errhint("Increase the platform's stack depth limit via \"ulimit -s\" or local equivalent.");
3328  return false;
3329  }
3330  return true;
3331 }
3332 
3333 /* GUC assign hook for max_stack_depth */
3334 void
3336 {
3337  long newval_bytes = newval * 1024L;
3338 
3339  max_stack_depth_bytes = newval_bytes;
3340 }
3341 
3342 
3343 /*
3344  * set_debug_options --- apply "-d N" command line option
3345  *
3346  * -d is not quite the same as setting log_min_messages because it enables
3347  * other output options.
3348  */
3349 void
3350 set_debug_options(int debug_flag, GucContext context, GucSource source)
3351 {
3352  if (debug_flag > 0)
3353  {
3354  char debugstr[64];
3355 
3356  sprintf(debugstr, "debug%d", debug_flag);
3357  SetConfigOption("log_min_messages", debugstr, context, source);
3358  }
3359  else
3360  SetConfigOption("log_min_messages", "notice", context, source);
3361 
3362  if (debug_flag >= 1 && context == PGC_POSTMASTER)
3363  {
3364  SetConfigOption("log_connections", "true", context, source);
3365  SetConfigOption("log_disconnections", "true", context, source);
3366  }
3367  if (debug_flag >= 2)
3368  SetConfigOption("log_statement", "all", context, source);
3369  if (debug_flag >= 3)
3370  SetConfigOption("debug_print_parse", "true", context, source);
3371  if (debug_flag >= 4)
3372  SetConfigOption("debug_print_plan", "true", context, source);
3373  if (debug_flag >= 5)
3374  SetConfigOption("debug_print_rewritten", "true", context, source);
3375 }
3376 
3377 
3378 bool
3380 {
3381  const char *tmp = NULL;
3382 
3383  switch (arg[0])
3384  {
3385  case 's': /* seqscan */
3386  tmp = "enable_seqscan";
3387  break;
3388  case 'i': /* indexscan */
3389  tmp = "enable_indexscan";
3390  break;
3391  case 'o': /* indexonlyscan */
3392  tmp = "enable_indexonlyscan";
3393  break;
3394  case 'b': /* bitmapscan */
3395  tmp = "enable_bitmapscan";
3396  break;
3397  case 't': /* tidscan */
3398  tmp = "enable_tidscan";
3399  break;
3400  case 'n': /* nestloop */
3401  tmp = "enable_nestloop";
3402  break;
3403  case 'm': /* mergejoin */
3404  tmp = "enable_mergejoin";
3405  break;
3406  case 'h': /* hashjoin */
3407  tmp = "enable_hashjoin";
3408  break;
3409  }
3410  if (tmp)
3411  {
3412  SetConfigOption(tmp, "false", context, source);
3413  return true;
3414  }
3415  else
3416  return false;
3417 }
3418 
3419 
3420 const char *
3422 {
3423  switch (arg[0])
3424  {
3425  case 'p':
3426  if (optarg[1] == 'a') /* "parser" */
3427  return "log_parser_stats";
3428  else if (optarg[1] == 'l') /* "planner" */
3429  return "log_planner_stats";
3430  break;
3431 
3432  case 'e': /* "executor" */
3433  return "log_executor_stats";
3434  break;
3435  }
3436 
3437  return NULL;
3438 }
3439 
3440 
3441 /* ----------------------------------------------------------------
3442  * process_postgres_switches
3443  * Parse command line arguments for PostgresMain
3444  *
3445  * This is called twice, once for the "secure" options coming from the
3446  * postmaster or command line, and once for the "insecure" options coming
3447  * from the client's startup packet. The latter have the same syntax but
3448  * may be restricted in what they can do.
3449  *
3450  * argv[0] is ignored in either case (it's assumed to be the program name).
3451  *
3452  * ctx is PGC_POSTMASTER for secure options, PGC_BACKEND for insecure options
3453  * coming from the client, or PGC_SU_BACKEND for insecure options coming from
3454  * a superuser client.
3455  *
3456  * If a database name is present in the command line arguments, it's
3457  * returned into *dbname (this is allowed only if *dbname is initially NULL).
3458  * ----------------------------------------------------------------
3459  */
3460 void
3461 process_postgres_switches(int argc, char *argv[], GucContext ctx,
3462  const char **dbname)
3463 {
3464  bool secure = (ctx == PGC_POSTMASTER);
3465  int errs = 0;
3466  GucSource gucsource;
3467  int flag;
3468 
3469  if (secure)
3470  {
3471  gucsource = PGC_S_ARGV; /* switches came from command line */
3472 
3473  /* Ignore the initial --single argument, if present */
3474  if (argc > 1 && strcmp(argv[1], "--single") == 0)
3475  {
3476  argv++;
3477  argc--;
3478  }
3479  }
3480  else
3481  {
3482  gucsource = PGC_S_CLIENT; /* switches came from client */
3483  }
3484 
3485 #ifdef HAVE_INT_OPTERR
3486 
3487  /*
3488  * Turn this off because it's either printed to stderr and not the log
3489  * where we'd want it, or argv[0] is now "--single", which would make for
3490  * a weird error message. We print our own error message below.
3491  */
3492  opterr = 0;
3493 #endif
3494 
3495  /*
3496  * Parse command-line options. CAUTION: keep this in sync with
3497  * postmaster/postmaster.c (the option sets should not conflict) and with
3498  * the common help() function in main/main.c.
3499  */
3500  while ((flag = getopt(argc, argv, "B:bc:C:D:d:EeFf:h:ijk:lN:nOo:Pp:r:S:sTt:v:W:-:")) != -1)
3501  {
3502  switch (flag)
3503  {
3504  case 'B':
3505  SetConfigOption("shared_buffers", optarg, ctx, gucsource);
3506  break;
3507 
3508  case 'b':
3509  /* Undocumented flag used for binary upgrades */
3510  if (secure)
3511  IsBinaryUpgrade = true;
3512  break;
3513 
3514  case 'C':
3515  /* ignored for consistency with the postmaster */
3516  break;
3517 
3518  case 'D':
3519  if (secure)
3520  userDoption = strdup(optarg);
3521  break;
3522 
3523  case 'd':
3524  set_debug_options(atoi(optarg), ctx, gucsource);
3525  break;
3526 
3527  case 'E':
3528  if (secure)
3529  EchoQuery = true;
3530  break;
3531 
3532  case 'e':
3533  SetConfigOption("datestyle", "euro", ctx, gucsource);
3534  break;
3535 
3536  case 'F':
3537  SetConfigOption("fsync", "false", ctx, gucsource);
3538  break;
3539 
3540  case 'f':
3541  if (!set_plan_disabling_options(optarg, ctx, gucsource))
3542  errs++;
3543  break;
3544 
3545  case 'h':
3546  SetConfigOption("listen_addresses", optarg, ctx, gucsource);
3547  break;
3548 
3549  case 'i':
3550  SetConfigOption("listen_addresses", "*", ctx, gucsource);
3551  break;
3552 
3553  case 'j':
3554  if (secure)
3555  UseSemiNewlineNewline = true;
3556  break;
3557 
3558  case 'k':
3559  SetConfigOption("unix_socket_directories", optarg, ctx, gucsource);
3560  break;
3561 
3562  case 'l':
3563  SetConfigOption("ssl", "true", ctx, gucsource);
3564  break;
3565 
3566  case 'N':
3567  SetConfigOption("max_connections", optarg, ctx, gucsource);
3568  break;
3569 
3570  case 'n':
3571  /* ignored for consistency with postmaster */
3572  break;
3573 
3574  case 'O':
3575  SetConfigOption("allow_system_table_mods", "true", ctx, gucsource);
3576  break;
3577 
3578  case 'o':
3579  errs++;
3580  break;
3581 
3582  case 'P':
3583  SetConfigOption("ignore_system_indexes", "true", ctx, gucsource);
3584  break;
3585 
3586  case 'p':
3587  SetConfigOption("port", optarg, ctx, gucsource);
3588  break;
3589 
3590  case 'r':
3591  /* send output (stdout and stderr) to the given file */
3592  if (secure)
3594  break;
3595 
3596  case 'S':
3597  SetConfigOption("work_mem", optarg, ctx, gucsource);
3598  break;
3599 
3600  case 's':
3601  SetConfigOption("log_statement_stats", "true", ctx, gucsource);
3602  break;
3603 
3604  case 'T':
3605  /* ignored for consistency with the postmaster */
3606  break;
3607 
3608  case 't':
3609  {
3610  const char *tmp = get_stats_option_name(optarg);
3611 
3612  if (tmp)
3613  SetConfigOption(tmp, "true", ctx, gucsource);
3614  else
3615  errs++;
3616  break;
3617  }
3618 
3619  case 'v':
3620 
3621  /*
3622  * -v is no longer used in normal operation, since
3623  * FrontendProtocol is already set before we get here. We keep
3624  * the switch only for possible use in standalone operation,
3625  * in case we ever support using normal FE/BE protocol with a
3626  * standalone backend.
3627  */
3628  if (secure)
3630  break;
3631 
3632  case 'W':
3633  SetConfigOption("post_auth_delay", optarg, ctx, gucsource);
3634  break;
3635 
3636  case 'c':
3637  case '-':
3638  {
3639  char *name,
3640  *value;
3641 
3642  ParseLongOption(optarg, &name, &value);
3643  if (!value)
3644  {
3645  if (flag == '-')
3646  ereport(ERROR,
3647  (errcode(ERRCODE_SYNTAX_ERROR),
3648  errmsg("--%s requires a value",
3649  optarg)));
3650  else
3651  ereport(ERROR,
3652  (errcode(ERRCODE_SYNTAX_ERROR),
3653  errmsg("-c %s requires a value",
3654  optarg)));
3655  }
3656  SetConfigOption(name, value, ctx, gucsource);
3657  free(name);
3658  if (value)
3659  free(value);
3660  break;
3661  }
3662 
3663  default:
3664  errs++;
3665  break;
3666  }
3667 
3668  if (errs)
3669  break;
3670  }
3671 
3672  /*
3673  * Optional database name should be there only if *dbname is NULL.
3674  */
3675  if (!errs && dbname && *dbname == NULL && argc - optind >= 1)
3676  *dbname = strdup(argv[optind++]);
3677 
3678  if (errs || argc != optind)
3679  {
3680  if (errs)
3681  optind--; /* complain about the previous argument */
3682 
3683  /* spell the error message a bit differently depending on context */
3684  if (IsUnderPostmaster)
3685  ereport(FATAL,
3686  (errcode(ERRCODE_SYNTAX_ERROR),
3687  errmsg("invalid command-line argument for server process: %s", argv[optind]),
3688  errhint("Try \"%s --help\" for more information.", progname)));
3689  else
3690  ereport(FATAL,
3691  (errcode(ERRCODE_SYNTAX_ERROR),
3692  errmsg("%s: invalid command-line argument: %s",
3693  progname, argv[optind]),
3694  errhint("Try \"%s --help\" for more information.", progname)));
3695  }
3696 
3697  /*
3698  * Reset getopt(3) library so that it will work correctly in subprocesses
3699  * or when this function is called a second time with another array.
3700  */
3701  optind = 1;
3702 #ifdef HAVE_INT_OPTRESET
3703  optreset = 1; /* some systems need this too */
3704 #endif
3705 }
3706 
3707 
3708 /* ----------------------------------------------------------------
3709  * PostgresMain
3710  * postgres main loop -- all backends, interactive or otherwise start here
3711  *
3712  * argc/argv are the command line arguments to be used. (When being forked
3713  * by the postmaster, these are not the original argv array of the process.)
3714  * dbname is the name of the database to connect to, or NULL if the database
3715  * name should be extracted from the command line arguments or defaulted.
3716  * username is the PostgreSQL user name to be used for the session.
3717  * ----------------------------------------------------------------
3718  */
3719 void
3720 PostgresMain(int argc, char *argv[],
3721  const char *dbname,
3722  const char *username)
3723 {
3724  int firstchar;
3725  StringInfoData input_message;
3726  sigjmp_buf local_sigjmp_buf;
3727  volatile bool send_ready_for_query = true;
3728  bool disable_idle_in_transaction_timeout = false;
3729 
3730  /* Initialize startup process environment if necessary. */
3731  if (!IsUnderPostmaster)
3732  InitStandaloneProcess(argv[0]);
3733 
3735 
3736  /*
3737  * Set default values for command-line options.
3738  */
3739  if (!IsUnderPostmaster)
3741 
3742  /*
3743  * Parse command-line options.
3744  */
3745  process_postgres_switches(argc, argv, PGC_POSTMASTER, &dbname);
3746 
3747  /* Must have gotten a database name, or have a default (the username) */
3748  if (dbname == NULL)
3749  {
3750  dbname = username;
3751  if (dbname == NULL)
3752  ereport(FATAL,
3753  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3754  errmsg("%s: no database nor user name specified",
3755  progname)));
3756  }
3757 
3758  /* Acquire configuration parameters, unless inherited from postmaster */
3759  if (!IsUnderPostmaster)
3760  {
3762  proc_exit(1);
3763  }
3764 
3765  /*
3766  * Set up signal handlers and masks.
3767  *
3768  * Note that postmaster blocked all signals before forking child process,
3769  * so there is no race condition whereby we might receive a signal before
3770  * we have set up the handler.
3771  *
3772  * Also note: it's best not to use any signals that are SIG_IGNored in the
3773  * postmaster. If such a signal arrives before we are able to change the
3774  * handler to non-SIG_IGN, it'll get dropped. Instead, make a dummy
3775  * handler in the postmaster to reserve the signal. (Of course, this isn't
3776  * an issue for signals that are locally generated, such as SIGALRM and
3777  * SIGPIPE.)
3778  */
3779  if (am_walsender)
3780  WalSndSignals();
3781  else
3782  {
3783  pqsignal(SIGHUP, PostgresSigHupHandler); /* set flag to read config
3784  * file */
3785  pqsignal(SIGINT, StatementCancelHandler); /* cancel current query */
3786  pqsignal(SIGTERM, die); /* cancel current query and exit */
3787 
3788  /*
3789  * In a standalone backend, SIGQUIT can be generated from the keyboard
3790  * easily, while SIGTERM cannot, so we make both signals do die()
3791  * rather than quickdie().
3792  */
3793  if (IsUnderPostmaster)
3794  pqsignal(SIGQUIT, quickdie); /* hard crash time */
3795  else
3796  pqsignal(SIGQUIT, die); /* cancel current query and exit */
3797  InitializeTimeouts(); /* establishes SIGALRM handler */
3798 
3799  /*
3800  * Ignore failure to write to frontend. Note: if frontend closes
3801  * connection, we will notice it and exit cleanly when control next
3802  * returns to outer loop. This seems safer than forcing exit in the
3803  * midst of output during who-knows-what operation...
3804  */
3809 
3810  /*
3811  * Reset some signals that are accepted by postmaster but not by
3812  * backend
3813  */
3814  pqsignal(SIGCHLD, SIG_DFL); /* system() requires this on some
3815  * platforms */
3816  }
3817 
3818  pqinitmask();
3819 
3820  if (IsUnderPostmaster)
3821  {
3822  /* We allow SIGQUIT (quickdie) at all times */
3823  sigdelset(&BlockSig, SIGQUIT);
3824  }
3825 
3826  PG_SETMASK(&BlockSig); /* block everything except SIGQUIT */
3827 
3828  if (!IsUnderPostmaster)
3829  {
3830  /*
3831  * Validate we have been given a reasonable-looking DataDir (if under
3832  * postmaster, assume postmaster did this already).
3833  */
3834  checkDataDir();
3835 
3836  /* Change into DataDir (if under postmaster, was done already) */
3837  ChangeToDataDir();
3838 
3839  /*
3840  * Create lockfile for data directory.
3841  */
3842  CreateDataDirLockFile(false);
3843 
3844  /* read control file (error checking and contains config ) */
3845  LocalProcessControlFile(false);
3846 
3847  /* Initialize MaxBackends (if under postmaster, was done already) */
3849  }
3850 
3851  /* Early initialization */
3852  BaseInit();
3853 
3854  /*
3855  * Create a per-backend PGPROC struct in shared memory, except in the
3856  * EXEC_BACKEND case where this was done in SubPostmasterMain. We must do
3857  * this before we can use LWLocks (and in the EXEC_BACKEND case we already
3858  * had to do some stuff with LWLocks).
3859  */
3860 #ifdef EXEC_BACKEND
3861  if (!IsUnderPostmaster)
3862  InitProcess();
3863 #else
3864  InitProcess();
3865 #endif
3866 
3867  /* We need to allow SIGINT, etc during the initial transaction */
3869 
3870  /*
3871  * General initialization.
3872  *
3873  * NOTE: if you are tempted to add code in this vicinity, consider putting
3874  * it inside InitPostgres() instead. In particular, anything that
3875  * involves database access should be there, not here.
3876  */
3877  InitPostgres(dbname, InvalidOid, username, InvalidOid, NULL, false);
3878 
3879  /*
3880  * If the PostmasterContext is still around, recycle the space; we don't
3881  * need it anymore after InitPostgres completes. Note this does not trash
3882  * *MyProcPort, because ConnCreate() allocated that space with malloc()
3883  * ... else we'd need to copy the Port data first. Also, subsidiary data
3884  * such as the username isn't lost either; see ProcessStartupPacket().
3885  */
3886  if (PostmasterContext)
3887  {
3889  PostmasterContext = NULL;
3890  }
3891 
3893 
3894  /*
3895  * Now all GUC states are fully set up. Report them to client if
3896  * appropriate.
3897  */
3899 
3900  /*
3901  * Also set up handler to log session end; we have to wait till now to be
3902  * sure Log_disconnections has its final value.
3903  */
3906 
3907  /* Perform initialization specific to a WAL sender process. */
3908  if (am_walsender)
3909  InitWalSender();
3910 
3911  /*
3912  * process any libraries that should be preloaded at backend start (this
3913  * likewise can't be done until GUC settings are complete)
3914  */
3916 
3917  /*
3918  * Send this backend's cancellation info to the frontend.
3919  */
3921  {
3923 
3924  pq_beginmessage(&buf, 'K');
3925  pq_sendint32(&buf, (int32) MyProcPid);
3926  pq_sendint32(&buf, (int32) MyCancelKey);
3927  pq_endmessage(&buf);
3928  /* Need not flush since ReadyForQuery will do it. */
3929  }
3930 
3931  /* Welcome banner for standalone case */
3933  printf("\nPostgreSQL stand-alone backend %s\n", PG_VERSION);
3934 
3935  /*
3936  * Create the memory context we will use in the main loop.
3937  *
3938  * MessageContext is reset once per iteration of the main loop, ie, upon
3939  * completion of processing of each command message from the client.
3940  */
3942  "MessageContext",
3944 
3945  /*
3946  * Create memory context and buffer used for RowDescription messages. As
3947  * SendRowDescriptionMessage(), via exec_describe_statement_message(), is
3948  * frequently executed for ever single statement, we don't want to
3949  * allocate a separate buffer every time.
3950  */
3951  row_description_context = AllocSetContextCreate(TopMemoryContext,
3952  "RowDescriptionContext",
3954  MemoryContextSwitchTo(row_description_context);
3955  initStringInfo(&row_description_buf);
3957 
3958  /*
3959  * Remember stand-alone backend startup time
3960  */
3961  if (!IsUnderPostmaster)
3963 
3964  /*
3965  * POSTGRES main processing loop begins here
3966  *
3967  * If an exception is encountered, processing resumes here so we abort the
3968  * current transaction and start a new one.
3969  *
3970  * You might wonder why this isn't coded as an infinite loop around a
3971  * PG_TRY construct. The reason is that this is the bottom of the
3972  * exception stack, and so with PG_TRY there would be no exception handler
3973  * in force at all during the CATCH part. By leaving the outermost setjmp
3974  * always active, we have at least some chance of recovering from an error
3975  * during error recovery. (If we get into an infinite loop thereby, it
3976  * will soon be stopped by overflow of elog.c's internal state stack.)
3977  *
3978  * Note that we use sigsetjmp(..., 1), so that this function's signal mask
3979  * (to wit, UnBlockSig) will be restored when longjmp'ing to here. This
3980  * is essential in case we longjmp'd out of a signal handler on a platform
3981  * where that leaves the signal blocked. It's not redundant with the
3982  * unblock in AbortTransaction() because the latter is only called if we
3983  * were inside a transaction.
3984  */
3985 
3986  if (sigsetjmp(local_sigjmp_buf, 1) != 0)
3987  {
3988  /*
3989  * NOTE: if you are tempted to add more code in this if-block,
3990  * consider the high probability that it should be in
3991  * AbortTransaction() instead. The only stuff done directly here
3992  * should be stuff that is guaranteed to apply *only* for outer-level
3993  * error recovery, such as adjusting the FE/BE protocol status.
3994  */
3995 
3996  /* Since not using PG_TRY, must reset error stack by hand */
3997  error_context_stack = NULL;
3998 
3999  /* Prevent interrupts while cleaning up */
4000  HOLD_INTERRUPTS();
4001 
4002  /*
4003  * Forget any pending QueryCancel request, since we're returning to
4004  * the idle loop anyway, and cancel any active timeout requests. (In
4005  * future we might want to allow some timeout requests to survive, but
4006  * at minimum it'd be necessary to do reschedule_timeouts(), in case
4007  * we got here because of a query cancel interrupting the SIGALRM
4008  * interrupt handler.) Note in particular that we must clear the
4009  * statement and lock timeout indicators, to prevent any future plain
4010  * query cancels from being misreported as timeouts in case we're
4011  * forgetting a timeout cancel.
4012  */
4013  disable_all_timeouts(false);
4014  QueryCancelPending = false; /* second to avoid race condition */
4015  stmt_timeout_active = false;
4016 
4017  /* Not reading from the client anymore. */
4018  DoingCommandRead = false;
4019 
4020  /* Make sure libpq is in a good state */
4021  pq_comm_reset();
4022 
4023  /* Report the error to the client and/or server log */
4024  EmitErrorReport();
4025 
4026  /*
4027  * Make sure debug_query_string gets reset before we possibly clobber
4028  * the storage it points at.
4029  */
4030  debug_query_string = NULL;
4031 
4032  /*
4033  * Abort the current transaction in order to recover.
4034  */
4036 
4037  if (am_walsender)
4039 
4041  SPICleanup();
4042 
4043  /*
4044  * We can't release replication slots inside AbortTransaction() as we
4045  * need to be able to start and abort transactions while having a slot
4046  * acquired. But we never need to hold them across top level errors,
4047  * so releasing here is fine. There's another cleanup in ProcKill()
4048  * ensuring we'll correctly cleanup on FATAL errors as well.
4049  */
4050  if (MyReplicationSlot != NULL)
4052 
4053  /* We also want to cleanup temporary slots on error. */
4055 
4057 
4058  /*
4059  * Now return to normal top-level context and clear ErrorContext for
4060  * next time.
4061  */
4063  FlushErrorState();
4064 
4065  /*
4066  * If we were handling an extended-query-protocol message, initiate
4067  * skip till next Sync. This also causes us not to issue
4068  * ReadyForQuery (until we get Sync).
4069  */
4071  ignore_till_sync = true;
4072 
4073  /* We don't have a transaction command open anymore */
4074  xact_started = false;
4075 
4076  /*
4077  * If an error occurred while we were reading a message from the
4078  * client, we have potentially lost track of where the previous
4079  * message ends and the next one begins. Even though we have
4080  * otherwise recovered from the error, we cannot safely read any more
4081  * messages from the client, so there isn't much we can do with the
4082  * connection anymore.
4083  */
4084  if (pq_is_reading_msg())
4085  ereport(FATAL,
4086  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4087  errmsg("terminating connection because protocol synchronization was lost")));
4088 
4089  /* Now we can allow interrupts again */
4091  }
4092 
4093  /* We can now handle ereport(ERROR) */
4094  PG_exception_stack = &local_sigjmp_buf;
4095 
4096  if (!ignore_till_sync)
4097  send_ready_for_query = true; /* initially, or after error */
4098 
4099  /*
4100  * Non-error queries loop here.
4101  */
4102 
4103  for (;;)
4104  {
4105  /*
4106  * At top of loop, reset extended-query-message flag, so that any
4107  * errors encountered in "idle" state don't provoke skip.
4108  */
4110 
4111  /*
4112  * Release storage left over from prior query cycle, and create a new
4113  * query input buffer in the cleared MessageContext.
4114  */
4117 
4118  initStringInfo(&input_message);
4119 
4120  /*
4121  * Also consider releasing our catalog snapshot if any, so that it's
4122  * not preventing advance of global xmin while we wait for the client.
4123  */
4125 
4126  /*
4127  * (1) If we've reached idle state, tell the frontend we're ready for
4128  * a new query.
4129  *
4130  * Note: this includes fflush()'ing the last of the prior output.
4131  *
4132  * This is also a good time to send collected statistics to the
4133  * collector, and to update the PS stats display. We avoid doing
4134  * those every time through the message loop because it'd slow down
4135  * processing of batched messages, and because we don't want to report
4136  * uncommitted updates (that confuses autovacuum). The notification
4137  * processor wants a call too, if we are not in a transaction block.
4138  */
4139  if (send_ready_for_query)
4140  {
4142  {
4143  set_ps_display("idle in transaction (aborted)", false);
4145 
4146  /* Start the idle-in-transaction timer */
4148  {
4149  disable_idle_in_transaction_timeout = true;
4152  }
4153  }
4155  {
4156  set_ps_display("idle in transaction", false);
4158 
4159  /* Start the idle-in-transaction timer */
4161  {
4162  disable_idle_in_transaction_timeout = true;
4165  }
4166  }
4167  else
4168  {
4170  pgstat_report_stat(false);
4171 
4172  set_ps_display("idle", false);
4174  }
4175 
4177  send_ready_for_query = false;
4178  }
4179 
4180  /*
4181  * (2) Allow asynchronous signals to be executed immediately if they
4182  * come in while we are waiting for client input. (This must be
4183  * conditional since we don't want, say, reads on behalf of COPY FROM
4184  * STDIN doing the same thing.)
4185  */
4186  DoingCommandRead = true;
4187 
4188  /*
4189  * (3) read a command (loop blocks here)
4190  */
4191  firstchar = ReadCommand(&input_message);
4192 
4193  /*
4194  * (4) disable async signal conditions again.
4195  *
4196  * Query cancel is supposed to be a no-op when there is no query in
4197  * progress, so if a query cancel arrived while we were idle, just
4198  * reset QueryCancelPending. ProcessInterrupts() has that effect when
4199  * it's called when DoingCommandRead is set, so check for interrupts
4200  * before resetting DoingCommandRead.
4201  */
4203  DoingCommandRead = false;
4204 
4205  /*
4206  * (5) turn off the idle-in-transaction timeout
4207  */
4208  if (disable_idle_in_transaction_timeout)
4209  {
4211  disable_idle_in_transaction_timeout = false;
4212  }
4213 
4214  /*
4215  * (6) check for any other interesting events that happened while we
4216  * slept.
4217  */
4218  if (ConfigReloadPending)
4219  {
4220  ConfigReloadPending = false;
4222  }
4223 
4224  /*
4225  * (7) process the command. But ignore it if we're skipping till
4226  * Sync.
4227  */
4228  if (ignore_till_sync && firstchar != EOF)
4229  continue;
4230 
4231  switch (firstchar)
4232  {
4233  case 'Q': /* simple query */
4234  {
4235  const char *query_string;
4236 
4237  /* Set statement_timestamp() */
4239 
4240  query_string = pq_getmsgstring(&input_message);
4241  pq_getmsgend(&input_message);
4242 
4243  if (am_walsender)
4244  {
4245  if (!exec_replication_command(query_string))
4246  exec_simple_query(query_string);
4247  }
4248  else
4249  exec_simple_query(query_string);
4250 
4251  send_ready_for_query = true;
4252  }
4253  break;
4254 
4255  case 'P': /* parse */
4256  {
4257  const char *stmt_name;
4258  const char *query_string;
4259  int numParams;
4260  Oid *paramTypes = NULL;
4261 
4262  forbidden_in_wal_sender(firstchar);
4263 
4264  /* Set statement_timestamp() */
4266 
4267  stmt_name = pq_getmsgstring(&input_message);
4268  query_string = pq_getmsgstring(&input_message);
4269  numParams = pq_getmsgint(&input_message, 2);
4270  if (numParams > 0)
4271  {
4272  paramTypes = (Oid *) palloc(numParams * sizeof(Oid));
4273  for (int i = 0; i < numParams; i++)
4274  paramTypes[i] = pq_getmsgint(&input_message, 4);
4275  }
4276  pq_getmsgend(&input_message);
4277 
4278  exec_parse_message(query_string, stmt_name,
4279  paramTypes, numParams);
4280  }
4281  break;
4282 
4283  case 'B': /* bind */
4284  forbidden_in_wal_sender(firstchar);
4285 
4286  /* Set statement_timestamp() */
4288 
4289  /*
4290  * this message is complex enough that it seems best to put
4291  * the field extraction out-of-line
4292  */
4293  exec_bind_message(&input_message);
4294  break;
4295 
4296  case 'E': /* execute */
4297  {
4298  const char *portal_name;
4299  int max_rows;
4300 
4301  forbidden_in_wal_sender(firstchar);
4302 
4303  /* Set statement_timestamp() */
4305 
4306  portal_name = pq_getmsgstring(&input_message);
4307  max_rows = pq_getmsgint(&input_message, 4);
4308  pq_getmsgend(&input_message);
4309 
4310  exec_execute_message(portal_name, max_rows);
4311  }
4312  break;
4313 
4314  case 'F': /* fastpath function call */
4315  forbidden_in_wal_sender(firstchar);
4316 
4317  /* Set statement_timestamp() */
4319 
4320  /* Report query to various monitoring facilities. */
4322  set_ps_display("<FASTPATH>", false);
4323 
4324  /* start an xact for this function invocation */
4326 
4327  /*
4328  * Note: we may at this point be inside an aborted
4329  * transaction. We can't throw error for that until we've
4330  * finished reading the function-call message, so
4331  * HandleFunctionRequest() must check for it after doing so.
4332  * Be careful not to do anything that assumes we're inside a
4333  * valid transaction here.
4334  */
4335 
4336  /* switch back to message context */
4338 
4339  HandleFunctionRequest(&input_message);
4340 
4341  /* commit the function-invocation transaction */
4343 
4344  send_ready_for_query = true;
4345  break;
4346 
4347  case 'C': /* close */
4348  {
4349  int close_type;
4350  const char *close_target;
4351 
4352  forbidden_in_wal_sender(firstchar);
4353 
4354  close_type = pq_getmsgbyte(&input_message);
4355  close_target = pq_getmsgstring(&input_message);
4356  pq_getmsgend(&input_message);
4357 
4358  switch (close_type)
4359  {
4360  case 'S':
4361  if (close_target[0] != '\0')
4362  DropPreparedStatement(close_target, false);
4363  else
4364  {
4365  /* special-case the unnamed statement */
4367  }
4368  break;
4369  case 'P':
4370  {
4371  Portal portal;
4372 
4373  portal = GetPortalByName(close_target);
4374  if (PortalIsValid(portal))
4375  PortalDrop(portal, false);
4376  }
4377  break;
4378  default:
4379  ereport(ERROR,
4380  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4381  errmsg("invalid CLOSE message subtype %d",
4382  close_type)));
4383  break;
4384  }
4385 
4387  pq_putemptymessage('3'); /* CloseComplete */
4388  }
4389  break;
4390 
4391  case 'D': /* describe */
4392  {
4393  int describe_type;
4394  const char *describe_target;
4395 
4396  forbidden_in_wal_sender(firstchar);
4397 
4398  /* Set statement_timestamp() (needed for xact) */
4400 
4401  describe_type = pq_getmsgbyte(&input_message);
4402  describe_target = pq_getmsgstring(&input_message);
4403  pq_getmsgend(&input_message);
4404 
4405  switch (describe_type)
4406  {
4407  case 'S':
4408  exec_describe_statement_message(describe_target);
4409  break;
4410  case 'P':
4411  exec_describe_portal_message(describe_target);
4412  break;
4413  default:
4414  ereport(ERROR,
4415  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4416  errmsg("invalid DESCRIBE message subtype %d",
4417  describe_type)));
4418  break;
4419  }
4420  }
4421  break;
4422 
4423  case 'H': /* flush */
4424  pq_getmsgend(&input_message);
4426  pq_flush();
4427  break;
4428 
4429  case 'S': /* sync */
4430  pq_getmsgend(&input_message);
4432  send_ready_for_query = true;
4433  break;
4434 
4435  /*
4436  * 'X' means that the frontend is closing down the socket. EOF
4437  * means unexpected loss of frontend connection. Either way,
4438  * perform normal shutdown.
4439  */
4440  case 'X':
4441  case EOF:
4442 
4443  /*
4444  * Reset whereToSendOutput to prevent ereport from attempting
4445  * to send any more messages to client.
4446  */
4449 
4450  /*
4451  * NOTE: if you are tempted to add more code here, DON'T!
4452  * Whatever you had in mind to do should be set up as an
4453  * on_proc_exit or on_shmem_exit callback, instead. Otherwise
4454  * it will fail to be called during other backend-shutdown
4455  * scenarios.
4456  */
4457  proc_exit(0);
4458 
4459  case 'd': /* copy data */
4460  case 'c': /* copy done */
4461  case 'f': /* copy fail */
4462 
4463  /*
4464  * Accept but ignore these messages, per protocol spec; we
4465  * probably got here because a COPY failed, and the frontend
4466  * is still sending data.
4467  */
4468  break;
4469 
4470  default:
4471  ereport(FATAL,
4472  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4473  errmsg("invalid frontend message type %d",
4474  firstchar)));
4475  }
4476  } /* end of input-reading loop */
4477 }
4478 
4479 /*
4480  * Throw an error if we're a WAL sender process.
4481  *
4482  * This is used to forbid anything else than simple query protocol messages
4483  * in a WAL sender process. 'firstchar' specifies what kind of a forbidden
4484  * message was received, and is used to construct the error message.
4485  */
4486 static void
4488 {
4489  if (am_walsender)
4490  {
4491  if (firstchar == 'F')
4492  ereport(ERROR,
4493  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4494  errmsg("fastpath function calls not supported in a replication connection")));
4495  else
4496  ereport(ERROR,
4497  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4498  errmsg("extended query protocol not supported in a replication connection")));
4499  }
4500 }
4501 
4502 
4503 /*
4504  * Obtain platform stack depth limit (in bytes)
4505  *
4506  * Return -1 if unknown
4507  */
4508 long
4510 {
4511 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_STACK)
4512  static long val = 0;
4513 
4514  /* This won't change after process launch, so check just once */
4515  if (val == 0)
4516  {
4517  struct rlimit rlim;
4518 
4519  if (getrlimit(RLIMIT_STACK, &rlim) < 0)
4520  val = -1;
4521  else if (rlim.rlim_cur == RLIM_INFINITY)
4522  val = LONG_MAX;
4523  /* rlim_cur is probably of an unsigned type, so check for overflow */
4524  else if (rlim.rlim_cur >= LONG_MAX)
4525  val = LONG_MAX;
4526  else
4527  val = rlim.rlim_cur;
4528  }
4529  return val;
4530 #else /* no getrlimit */
4531 #if defined(WIN32) || defined(__CYGWIN__)
4532  /* On Windows we set the backend stack size in src/backend/Makefile */
4533  return WIN32_STACK_RLIMIT;
4534 #else /* not windows ... give up */
4535  return -1;
4536 #endif
4537 #endif
4538 }
4539 
4540 
4541 static struct rusage Save_r;
4542 static struct timeval Save_t;
4543 
4544 void
4546 {
4548  gettimeofday(&Save_t, NULL);
4549 }
4550 
4551 void
4552 ShowUsage(const char *title)
4553 {
4555  struct timeval user,
4556  sys;
4557  struct timeval elapse_t;
4558  struct rusage r;
4559 
4560  getrusage(RUSAGE_SELF, &r);
4561  gettimeofday(&elapse_t, NULL);
4562  memcpy((char *) &user, (char *) &r.ru_utime, sizeof(user));
4563  memcpy((char *) &sys, (char *) &r.ru_stime, sizeof(sys));
4564  if (elapse_t.tv_usec < Save_t.tv_usec)
4565  {
4566  elapse_t.tv_sec--;
4567  elapse_t.tv_usec += 1000000;
4568  }
4569  if (r.ru_utime.tv_usec < Save_r.ru_utime.tv_usec)
4570  {
4571  r.ru_utime.tv_sec--;
4572  r.ru_utime.tv_usec += 1000000;
4573  }
4574  if (r.ru_stime.tv_usec < Save_r.ru_stime.tv_usec)
4575  {
4576  r.ru_stime.tv_sec--;
4577  r.ru_stime.tv_usec += 1000000;
4578  }
4579 
4580  /*
4581  * The only stats we don't show here are ixrss, idrss, isrss. It takes
4582  * some work to interpret them, and most platforms don't fill them in.
4583  */
4584  initStringInfo(&str);
4585 
4586  appendStringInfoString(&str, "! system usage stats:\n");
4587  appendStringInfo(&str,
4588  "!\t%ld.%06ld s user, %ld.%06ld s system, %ld.%06ld s elapsed\n",
4589  (long) (r.ru_utime.tv_sec - Save_r.ru_utime.tv_sec),
4590  (long) (r.ru_utime.tv_usec - Save_r.ru_utime.tv_usec),
4591  (long) (r.ru_stime.tv_sec - Save_r.ru_stime.tv_sec),
4592  (long) (r.ru_stime.tv_usec - Save_r.ru_stime.tv_usec),
4593  (long) (elapse_t.tv_sec - Save_t.tv_sec),
4594  (long) (elapse_t.tv_usec - Save_t.tv_usec));
4595  appendStringInfo(&str,
4596  "!\t[%ld.%06ld s user, %ld.%06ld s system total]\n",
4597  (long) user.tv_sec,
4598  (long) user.tv_usec,
4599  (long) sys.tv_sec,
4600  (long) sys.tv_usec);
4601 #if defined(HAVE_GETRUSAGE)
4602  appendStringInfo(&str,
4603  "!\t%ld kB max resident size\n",
4604 #if defined(__darwin__)
4605  /* in bytes on macOS */
4606  r.ru_maxrss / 1024
4607 #else
4608  /* in kilobytes on most other platforms */
4609  r.ru_maxrss
4610 #endif
4611  );
4612  appendStringInfo(&str,
4613  "!\t%ld/%ld [%ld/%ld] filesystem blocks in/out\n",
4614  r.ru_inblock - Save_r.ru_inblock,
4615  /* they only drink coffee at dec */
4616  r.ru_oublock - Save_r.ru_oublock,
4617  r.ru_inblock, r.ru_oublock);
4618  appendStringInfo(&str,
4619  "!\t%ld/%ld [%ld/%ld] page faults/reclaims, %ld [%ld] swaps\n",
4620  r.ru_majflt - Save_r.ru_majflt,
4621  r.ru_minflt - Save_r.ru_minflt,
4622  r.ru_majflt, r.ru_minflt,
4623  r.ru_nswap - Save_r.ru_nswap,
4624  r.ru_nswap);
4625  appendStringInfo(&str,
4626  "!\t%ld [%ld] signals rcvd, %ld/%ld [%ld/%ld] messages rcvd/sent\n",
4627  r.ru_nsignals - Save_r.ru_nsignals,
4628  r.ru_nsignals,
4629  r.ru_msgrcv - Save_r.ru_msgrcv,
4630  r.ru_msgsnd - Save_r.ru_msgsnd,
4631  r.ru_msgrcv, r.ru_msgsnd);
4632  appendStringInfo(&str,
4633  "!\t%ld/%ld [%ld/%ld] voluntary/involuntary context switches\n",
4634  r.ru_nvcsw - Save_r.ru_nvcsw,
4635  r.ru_nivcsw - Save_r.ru_nivcsw,
4636  r.ru_nvcsw, r.ru_nivcsw);
4637 #endif /* HAVE_GETRUSAGE */
4638 
4639  /* remove trailing newline */
4640  if (str.data[str.len - 1] == '\n')
4641  str.data[--str.len] = '\0';
4642 
4643  ereport(LOG,
4644  (errmsg_internal("%s", title),
4645  errdetail_internal("%s", str.data)));
4646 
4647  pfree(str.data);
4648 }
4649 
4650 /*
4651  * on_proc_exit handler to log end of session
4652  */
4653 static void
4655 {
4656  Port *port = MyProcPort;
4657  long secs;
4658  int usecs;
4659  int msecs;
4660  int hours,
4661  minutes,
4662  seconds;
4663 
4666  &secs, &usecs);
4667  msecs = usecs / 1000;
4668 
4669  hours = secs / SECS_PER_HOUR;
4670  secs %= SECS_PER_HOUR;
4671  minutes = secs / SECS_PER_MINUTE;
4672  seconds = secs % SECS_PER_MINUTE;
4673 
4674  ereport(LOG,
4675  (errmsg("disconnection: session time: %d:%02d:%02d.%03d "
4676  "user=%s database=%s host=%s%s%s",
4677  hours, minutes, seconds, msecs,
4678  port->user_name, port->database_name, port->remote_host,
4679  port->remote_port[0] ? " port=" : "", port->remote_port)));
4680 }
4681 
4682 /*
4683  * Start statement timeout timer, if enabled.
4684  *
4685  * If there's already a timeout running, don't restart the timer. That
4686  * enables compromises between accuracy of timeouts and cost of starting a
4687  * timeout.
4688  */
4689 static void
4691 {
4692  /* must be within an xact */
4694 
4695  if (StatementTimeout > 0)
4696  {
4697  if (!stmt_timeout_active)
4698  {
4700  stmt_timeout_active = true;
4701  }
4702  }
4703  else
4705 }
4706 
4707 /*
4708  * Disable statement timeout, if active.
4709  */
4710 static void
4712 {
4713  if (stmt_timeout_active)
4714  {
4716 
4717  stmt_timeout_active = false;
4718  }
4719 }
pg_stack_base_t set_stack_base(void)
Definition: postgres.c:3202
signed short int16
Definition: c.h:345
void ProcessCatchupInterrupt(void)
Definition: sinval.c:177
static bool IsTransactionStmtList(List *pstmts)
Definition: postgres.c:2647
void InitializeTimeouts(void)
Definition: timeout.c:340
MemoryContext context
Definition: plancache.h:106
ParamExternData params[FLEXIBLE_ARRAY_MEMBER]
Definition: params.h:124
#define NIL
Definition: pg_list.h:69
static void pq_sendint16(StringInfo buf, uint16 i)
Definition: pqformat.h:137
Datum value
Definition: params.h:92
int log_min_duration_statement
Definition: guc.c:512
void AbortCurrentTransaction(void)
Definition: xact.c:3166
volatile uint32 InterruptHoldoffCount
Definition: globals.c:36
GucContext
Definition: guc.h:68
void SetRemoteDestReceiverParams(DestReceiver *self, Portal portal)
Definition: printtup.c:107
Portal CreatePortal(const char *name, bool allowDup, bool dupSilent)
Definition: portalmem.c:175
static void exec_describe_portal_message(const char *portal_name)
Definition: postgres.c:2511
#define SIGQUIT
Definition: win32_port.h:164
TimestampTz get_timeout_finish_time(TimeoutId id)
Definition: timeout.c:667
#define IsA(nodeptr, _type_)
Definition: nodes.h:575
double log_statement_sample_rate
Definition: guc.c:514
int gettimeofday(struct timeval *tp, struct timezone *tzp)
Definition: gettimeofday.c:105
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:211
#define AllocSetContextCreate
Definition: memutils.h:169
bool IsWaitingForLock(void)
Definition: proc.c:695
void RecoveryConflictInterrupt(ProcSignalReason reason)
Definition: postgres.c:2842
#define HOLD_CANCEL_INTERRUPTS()
Definition: miscadmin.h:124
List * QueryRewrite(Query *parsetree)
volatile sig_atomic_t QueryCancelPending
Definition: globals.c:31
void BeginReportingGUCOptions(void)
Definition: guc.c:6024
#define DEBUG1
Definition: elog.h:25
int MyProcPid
Definition: globals.c:40
int errhint(const char *fmt,...)
Definition: elog.c:974
int stmt_location
Definition: parsenodes.h:180
void getTypeOutputInfo(Oid type, Oid *typOutput, bool *typIsVarlena)
Definition: lsyscache.c:2674
CachedPlan * GetCachedPlan(CachedPlanSource *plansource, ParamListInfo boundParams, bool useResOwner, QueryEnvironment *queryEnv)
Definition: plancache.c:1138
void PortalSetResultFormat(Portal portal, int nFormats, int16 *formats)
Definition: pquery.c:624
bool analyze_requires_snapshot(RawStmt *parseTree)
Definition: analyze.c:357
int GetOldFunctionMessage(StringInfo buf)
Definition: fastpath.c:77
List * raw_parser(const char *str)
Definition: parser.c:36
#define pq_flush()
Definition: libpq.h:39
static int ReadCommand(StringInfo inBuf)
Definition: postgres.c:509
struct Port * MyProcPort
Definition: globals.c:43
void PortalStart(Portal portal, ParamListInfo params, int eflags, Snapshot snapshot)
Definition: pquery.c:443
void pgstat_report_recovery_conflict(int reason)
Definition: pgstat.c:1491
static void finish_xact_command(void)
Definition: postgres.c:2583
void elog_node_display(int lev, const char *title, const void *obj, bool pretty)
Definition: print.c:72
void ProcessConfigFile(GucContext context)
bool visible
Definition: portal.h:194
CommandDest
Definition: dest.h:86
bool log_parser_stats
Definition: guc.c:491
bool equal(const void *a, const void *b)
Definition: equalfuncs.c:2996
void PortalDefineQuery(Portal portal, const char *prepStmtName, const char *sourceText, const char *commandTag, List *stmts, CachedPlan *cplan)
Definition: portalmem.c:281
bool exec_replication_command(const char *cmd_string)
Definition: walsender.c:1427
#define SIGUSR1
Definition: win32_port.h:175
#define castNode(_type_, nodeptr)
Definition: nodes.h:593
bool log_statement_stats
Definition: guc.c:494
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1591
#define GUC_check_errdetail
Definition: guc.h:415
const char * commandTag
Definition: plancache.h:98
void on_proc_exit(pg_on_exit_callback function, Datum arg)
Definition: ipc.c:305
void pgstat_report_activity(BackendState state, const char *cmd_str)
Definition: pgstat.c:3076
QueryEnvironment * p_queryEnv
Definition: parse_node.h:200
CachedPlanSource * plansource
Definition: prepare.h:31
#define SIGCHLD
Definition: win32_port.h:173
PGPROC * MyProc
Definition: proc.c:68
const char * pq_getmsgstring(StringInfo msg)
Definition: pqformat.c:581
void ShowUsage(const char *title)
Definition: postgres.c:4552
void MemoryContextSetParent(MemoryContext context, MemoryContext new_parent)
Definition: mcxt.c:354
Portal GetPortalByName(const char *name)
Definition: portalmem.c:130
long random(void)
Definition: random.c:22
#define CURSOR_OPT_BINARY
Definition: parsenodes.h:2682
char * pstrdup(const char *in)
Definition: mcxt.c:1161
void CommitTransactionCommand(void)
Definition: xact.c:2902
void InitStandaloneProcess(const char *argv0)
Definition: miscinit.c:318
void ParseLongOption(const char *string, char **name, char **value)
Definition: guc.c:10289
bool IsAbortedTransactionBlockState(void)
Definition: xact.c:377
bool set_plan_disabling_options(const char *arg, GucContext context, GucSource source)
Definition: postgres.c:3379
static struct rusage Save_r
Definition: postgres.c:4541
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
void SPICleanup(void)
Definition: spi.c:349
volatile uint32 QueryCancelHoldoffCount
Definition: globals.c:37
void set_ps_display(const char *activity, bool force)
Definition: ps_status.c:331
static struct @145 value
static void forbidden_in_wal_sender(char firstchar)
Definition: postgres.c:4487
Definition: nodes.h:524
bool PortalRun(Portal portal, long count, bool isTopLevel, bool run_once, DestReceiver *dest, DestReceiver *altdest, char *completionTag)
Definition: pquery.c:686
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Definition: ipc.c:104
int errcode(int sqlerrcode)
Definition: elog.c:570
Definition: libpq-be.h:120
int errhidestmt(bool hide_stmt)
Definition: elog.c:1055
Query * parse_analyze_varparams(RawStmt *parseTree, const char *sourceText, Oid **paramTypes, int *numParams)
Definition: analyze.c:134
bool IsTransactionOrTransactionBlock(void)
Definition: xact.c:4634
const char * get_stats_option_name(const char *arg)
Definition: postgres.c:3421
static List * new_list(NodeTag type)
Definition: list.c:63
void pq_putemptymessage(char msgtype)
Definition: pqformat.c:390
#define SetProcessingMode(mode)
Definition: miscadmin.h:380
void BaseInit(void)
Definition: postinit.c:550
static int errdetail_abort(void)
Definition: postgres.c:2366
#define printf(...)
Definition: port.h:198
char * remote_port
Definition: libpq-be.h:132
void PopActiveSnapshot(void)
Definition: snapmgr.c:814
void set_debug_options(int debug_flag, GucContext context, GucSource source)
Definition: postgres.c:3350
void checkDataDir(void)
Definition: miscinit.c:99
struct timeval ru_stime
Definition: rusagestub.h:29
void BeginCommand(const char *commandTag, CommandDest dest)
Definition: dest.c:103
#define SIGPIPE
Definition: win32_port.h:168
#define SIGUSR2
Definition: win32_port.h:176
int getrusage(int who, struct rusage *rusage)
Definition: getrusage.c:31
#define LOG
Definition: elog.h:26
unsigned int Oid
Definition: postgres_ext.h:31
List * pg_analyze_and_rewrite(RawStmt *parsetree, const char *query_string, Oid *paramTypes, int numParams, QueryEnvironment *queryEnv)
Definition: postgres.c:680
#define PG_PROTOCOL_MAJOR(v)
Definition: pqcomm.h:104
void SetLatch(Latch *latch)
Definition: latch.c:436
Node * utilityStmt
Definition: parsenodes.h:120
List * stmts
Definition: portal.h:136
#define linitial_node(type, l)
Definition: pg_list.h:114
const char * progname
Definition: pg_standby.c:37
void restore_stack_base(pg_stack_base_t base)
Definition: postgres.c:3233
bool IsLogicalWorker(void)
Definition: worker.c:1742
ParamListInfo makeParamList(int numParams)
Definition: params.c:32
Snapshot GetTransactionSnapshot(void)
Definition: snapmgr.c:306
#define OidIsValid(objectId)
Definition: c.h:638
bool IsBinaryUpgrade
Definition: globals.c:110
int stmt_len
Definition: plannodes.h:94
PlannedStmt * planner(Query *parse, int cursorOptions, ParamListInfo boundParams)
Definition: planner.c:268
MemoryContext portalContext
Definition: portal.h:119
int getopt(int nargc, char *const *nargv, const char *ostr)
Definition: getopt.c:71
void FlushErrorState(void)
Definition: elog.c:1574
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
void pq_beginmessage(StringInfo buf, char msgtype)
Definition: pqformat.c:87
void StatementCancelHandler(SIGNAL_ARGS)
Definition: postgres.c:2785
const char * pq_getmsgbytes(StringInfo msg, int datalen)
Definition: pqformat.c:510
signed int int32
Definition: c.h:346
static void exec_execute_message(const char *portal_name, long max_rows)
Definition: postgres.c:1946
int errdetail_internal(const char *fmt,...)
Definition: elog.c:887
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Definition: guc.h:105
static bool IsTransactionExitStmt(Node *parsetree)
Definition: postgres.c:2615
static void log_disconnections(int code, Datum arg)
Definition: postgres.c:4654
ParseState * make_parsestate(ParseState *parentParseState)
Definition: parse_node.c:44
TupleDesc resultDesc
Definition: plancache.h:105
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Definition: jit.c:131
#define RESUME_INTERRUPTS()
Definition: miscadmin.h:118
ErrorContextCallback * error_context_stack
Definition: elog.c:88
int check_log_duration(char *msec_str, bool was_logged)
Definition: postgres.c:2212
#define list_make1(x1)
Definition: pg_list.h:139
volatile bool ParallelMessagePending
Definition: parallel.c:113
static void pq_sendint32(StringInfo buf, uint32 i)
Definition: pqformat.h:145
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Definition: pqsignal.c:41
static int errdetail_execute(List *raw_parsetree_list)
Definition: postgres.c:2269
#define sprintf
Definition: port.h:194
bool ClientAuthInProgress
Definition: postmaster.c:352
void ResetUsage(void)
Definition: postgres.c:4545
static void disable_statement_timeout(void)
Definition: postgres.c:4711
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Definition: walsender.c:114
bool check_max_stack_depth(int *newval, void **extra, GucSource source)
Definition: postgres.c:3318
bool Debug_print_plan
Definition: guc.c:486
#define appendStringInfoCharMacro(str, ch)
Definition: stringinfo.h:127
ParamFetchHook paramFetch
Definition: params.h:112
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Definition: mcxt.c:1031
ParamListInfo portalParams
Definition: portal.h:139
char * pg_client_to_server(const char *s, int len)
Definition: mbutils.c:545
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Definition: timeout.c:596
int optind
Definition: getopt.c:50
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:78
void EndCommand(const char *commandTag, CommandDest dest)
Definition: dest.c:166
#define ERROR
Definition: elog.h:43
void CreateDataDirLockFile(bool amPostmaster)
Definition: miscinit.c:1177
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Definition: pqcomm.c:1211
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Definition: async.c:1730
static int InteractiveBackend(StringInfo inBuf)
Definition: postgres.c:216
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Definition: pqcomm.c:1251
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Definition: proc.c:64
int32 MyCancelKey
Definition: globals.c:44
static int interactive_getc(void)
Definition: postgres.c:304
void WalSndSignals(void)
Definition: walsender.c:3014
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Definition: postgres.c:2965
#define FATAL
Definition: elog.h:52
List * pg_parse_query(const char *query_string)
Definition: postgres.c:632
void MemoryContextStats(MemoryContext context)
Definition: mcxt.c:474
#define MAXPGPATH
bool Debug_print_parse
Definition: guc.c:487
const char * commandTag
Definition: portal.h:135
Datum OidReceiveFunctionCall(Oid functionId, StringInfo buf, Oid typioparam, int32 typmod)
Definition: fmgr.c:1664
void PostgresMain(int argc, char *argv[], const char *dbname, const char *username)
Definition: postgres.c:3720
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:191
#define lfirst_node(type, lc)
Definition: pg_list.h:109
#define DEBUG2
Definition: elog.h:24
void InitProcess(void)
Definition: proc.c:305
void HandleParallelMessages(void)
Definition: parallel.c:969
void appendStringInfoString(StringInfo str, const char *s)
Definition: stringinfo.c:163
void(* ParserSetupHook)(struct ParseState *pstate, void *arg)
Definition: params.h:108
static void enable_statement_timeout(void)
Definition: postgres.c:4690
Definition: dest.h:88
Oid * param_types
Definition: plancache.h:99
char * c
int stmt_location
Definition: plannodes.h:93
Node * stmt
Definition: parsenodes.h:1485
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Definition: globals.c:70
void SetConfigOption(const char *name, const char *value, GucContext context, GucSource source)
Definition: guc.c:7500
static char * buf
Definition: pg_test_fsync.c:68
static struct timeval Save_t
Definition: postgres.c:4542
void PushActiveSnapshot(Snapshot snap)
Definition: snapmgr.c:735
List * CachedPlanGetTargetList(CachedPlanSource *plansource, QueryEnvironment *queryEnv)
Definition: plancache.c:1428
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Definition: proc.h:127
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Definition: xact.c:3972
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Definition: postgres.c:3255
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Definition: globals.c:109
static CachedPlanSource * unnamed_stmt_psrc
Definition: postgres.c:158
DestReceiver * CreateDestReceiver(CommandDest dest)
Definition: dest.c:113
static void exec_bind_message(StringInfo input_message)
Definition: postgres.c:1576
char * flag(int b)
Definition: test-ctype.c:33
#define SECS_PER_MINUTE
Definition: timestamp.h:88
int errdetail(const char *fmt,...)
Definition: elog.c:860
Definition: dest.h:89
#define COMMERROR
Definition: elog.h:30
CachedPlanSource * CreateCachedPlan(RawStmt *raw_parse_tree, const char *query_string, const char *commandTag)
Definition: plancache.c:164
#define SIGHUP
Definition: win32_port.h:163
#define MAX_RANDOM_VALUE
Node * utilityStmt
Definition: plannodes.h:90
void PostgresSigHupHandler(SIGNAL_ARGS)
Definition: postgres.c:2825
void LocalProcessControlFile(bool reset)
Definition: xlog.c:4923
volatile sig_atomic_t ClientConnectionLost
Definition: globals.c:33
char * user_name
Definition: libpq-be.h:141
void ChangeToDataDir(void)
Definition: miscinit.c:213
int opterr
Definition: getopt.c:49
void resetStringInfo(StringInfo str)
Definition: stringinfo.c:62
void ReplicationSlotRelease(void)
Definition: slot.c:424
sigset_t UnBlockSig
Definition: pqsignal.c:22
bool ActiveSnapshotSet(void)
Definition: snapmgr.c:853
static int SocketBackend(StringInfo inBuf)
Definition: postgres.c:332
void PortalErrorCleanup(void)
Definition: portalmem.c:908
static bool stmt_timeout_active
Definition: postgres.c:151
static bool xact_started
Definition: postgres.c:132
const char * p_sourcetext
Definition: parse_node.h:176
void InitWalSender(void)
volatile uint32 CritSectionCount
Definition: globals.c:38
static int errdetail_params(ParamListInfo params)
Definition: postgres.c:2300
void getTypeBinaryInputInfo(Oid type, Oid *typReceive, Oid *typIOParam)
Definition: lsyscache.c:2707
volatile sig_atomic_t IdleInTransactionSessionTimeoutPending
Definition: globals.c:34
char * portalname
Definition: parsenodes.h:2733
bool IsAutoVacuumWorkerProcess(void)
Definition: autovacuum.c:3277
#define lnext(lc)
Definition: pg_list.h:105
void getTypeInputInfo(Oid type, Oid *typInput, Oid *typIOParam)
Definition: lsyscache.c:2641
#define ereport(elevel, rest)
Definition: elog.h:141
int max_stack_depth
Definition: postgres.c:98
void LockErrorCleanup(void)
Definition: proc.c:712
#define SECS_PER_HOUR
Definition: timestamp.h:87
MemoryContext TopMemoryContext
Definition: mcxt.c:44
const char * CreateCommandTag(Node *parsetree)
Definition: utility.c:2087
static int port
Definition: pg_regress.c:92
static ProcSignalReason RecoveryConflictReason
Definition: postgres.c:168
Definition: guc.h:72
long get_stack_depth_rlimit(void)
Definition: postgres.c:4509
bool xact_is_sampled
Definition: xact.c:269
List * lappend(List *list, void *datum)
Definition: list.c:128
static bool RecoveryConflictPending
Definition: postgres.c:166
volatile sig_atomic_t ConfigReloadPending
Definition: globals.c:35
uint64 queryId
Definition: parsenodes.h:116
#define SIG_IGN
Definition: win32_port.h:160
void appendStringInfoChar(StringInfo str, char ch)
Definition: stringinfo.c:175
void initStringInfo(StringInfo str)
Definition: stringinfo.c:46
#define WARNING
Definition: elog.h:40
const char * debug_query_string
Definition: postgres.c:87
uint32 ProtocolVersion
Definition: pqcomm.h:113
#define unconstify(underlying_type, expr)
Definition: c.h:1149
int pq_getmessage(StringInfo s, int maxlen)
Definition: pqcomm.c:1273
static List * pg_rewrite_query(Query *query)
Definition: postgres.c:769
#define InvalidSnapshot
Definition: snapshot.h:104
#define MemoryContextResetAndDeleteChildren(ctx)
Definition: memutils.h:67
static bool check_log_statement(List *stmt_list)
Definition: postgres.c:2172
static void exec_parse_message(const char *query_string, const char *stmt_name, Oid *paramTypes, int numParams)
Definition: postgres.c:1314
#define PortalIsValid(p)
Definition: portal.h:201
static bool RecoveryConflictRetryable
Definition: postgres.c:167
static void start_xact_command(void)
Definition: postgres.c:2563
static bool doing_extended_query_message
Definition: postgres.c:145
sigset_t BlockSig
Definition: pqsignal.c:22
void process_session_preload_libraries(void)
Definition: miscinit.c:1596
bool canSetTag
Definition: plannodes.h:54
void WalSndErrorCleanup(void)
Definition: walsender.c:298
struct timeval ru_utime
Definition: rusagestub.h:28
void EndImplicitTransactionBlock(void)
Definition: xact.c:3997
bool ismove
Definition: parsenodes.h:2734
int16 * formats
Definition: portal.h:159
TimestampTz MyStartTimestamp
Definition: globals.c:42
uintptr_t Datum
Definition: postgres.h:367
void CommandCounterIncrement(void)
Definition: xact.c:1004
CmdType commandType
Definition: plannodes.h:46
bool SelectConfigFiles(const char *userDoption, const char *progname)
Definition: guc.c:5352
void ProcessClientReadInterrupt(bool blocked)
Definition: postgres.c:530
#define RUSAGE_SELF
Definition: rusagestub.h:23
int PostAuthDelay
Definition: postgres.c:101
bool get_timeout_indicator(TimeoutId id, bool reset_indicator)
Definition: timeout.c:633
static int errdetail_recovery_conflict(void)
Definition: postgres.c:2380
void EmitErrorReport(void)
Definition: elog.c:1433
static StringInfoData row_description_buf
Definition: postgres.c:172
const char * sourceText
Definition: portal.h:134
TimestampTz PgStartTime
Definition: timestamp.c:49
void StorePreparedStatement(const char *stmt_name, CachedPlanSource *plansource, bool from_sql)
Definition: prepare.c:443
int pq_getbyte(void)
Definition: pqcomm.c:1001
void pq_endmsgread(void)
Definition: pqcomm.c:1235
static char * username
Definition: initdb.c:133
TupleDesc tupDesc
Definition: portal.h:157
#define InvalidOid
Definition: postgres_ext.h:36
void SaveCachedPlan(CachedPlanSource *plansource)
Definition: plancache.c:452
void InitPostgres(const char *in_dbname, Oid dboid, const char *username, Oid useroid, char *out_dbname, bool override_allow_connections)
Definition: postinit.c:592
Query * parse_analyze(RawStmt *parseTree, const char *sourceText, Oid *paramTypes, int numParams, QueryEnvironment *queryEnv)
Definition: analyze.c:100
pqsigfunc pqsignal(int signum, pqsigfunc handler)
Definition: signal.c:170
#define free(a)
Definition: header.h:65
CmdType commandType
Definition: parsenodes.h:112
int pq_getmsgbyte(StringInfo msg)
Definition: pqformat.c:401
void(* rDestroy)(DestReceiver *self)
Definition: dest.h:126
size_t strlcpy(char *dst, const char *src, size_t siz)
Definition: strlcpy.c:45
bool log_duration
Definition: guc.c:485
int errmsg_internal(const char *fmt,...)
Definition: elog.c:814
void enable_timeout_after(TimeoutId id, int delay_ms)
Definition: timeout.c:428
ReplicationSlot * MyReplicationSlot
Definition: slot.c:96
static long max_stack_depth_bytes
Definition: postgres.c:111
#define makeNode(_type_)
Definition: nodes.h:572
#define COMPLETION_TAG_BUFSIZE
Definition: dest.h:74
#define pq_comm_reset()
Definition: libpq.h:38
#define SIG_DFL
Definition: win32_port.h:158
#define SIGNAL_ARGS
Definition: c.h:1245
#define Assert(condition)
Definition: c.h:732
void ProcessCompletedNotifies(void)
Definition: async.c:1100
#define lfirst(lc)
Definition: pg_list.h:106
volatile sig_atomic_t ProcDiePending
Definition: globals.c:32
bool proc_exit_inprogress
Definition: ipc.c:40
void CompleteCachedPlan(CachedPlanSource *plansource, List *querytree_list, MemoryContext querytree_context, Oid *param_types, int num_params, ParserSetupHook parserSetup, void *parserSetupArg, int cursor_options, bool fixed_result)
Definition: plancache.c:336
void HandleFunctionRequest(StringInfo msgBuf)
Definition: fastpath.c:259
void InvalidateCatalogSnapshotConditionally(void)
Definition: snapmgr.c:533
bool HoldingBufferPinThatDelaysRecovery(void)
Definition: bufmgr.c:3698
void StartTransactionCommand(void)
Definition: xact.c:2801
static bool DoingCommandRead
Definition: postgres.c:139
Query * transformTopLevelStmt(ParseState *pstate, RawStmt *parseTree)
Definition: analyze.c:191
bool canSetTag
Definition: parsenodes.h:118
uint16 pflags
Definition: params.h:94
const char * query_string
Definition: plancache.h:97
void InitializeMaxBackends(void)
Definition: postinit.c:528
char * dbname
Definition: streamutil.c:52
static int list_length(const List *l)
Definition: pg_list.h:89
#define newval
bool IsTransactionState(void)
Definition: xact.c:357
volatile sig_atomic_t InterruptPending
Definition: globals.c:30
MemoryContext MessageContext
Definition: mcxt.c:48
static bool IsTransactionExitStmtList(List *pstmts)
Definition: postgres.c:2632
List * pg_analyze_and_rewrite_params(RawStmt *parsetree, const char *query_string, ParserSetupHook parserSetup, void *parserSetupArg, QueryEnvironment *queryEnv)
Definition: postgres.c:717
Datum querytree(PG_FUNCTION_ARGS)
Definition: _int_bool.c:665
struct RawStmt * raw_parse_tree
Definition: plancache.h:96
sigjmp_buf * PG_exception_stack
Definition: elog.c:90
const char * name
Definition: encode.c:521
int log_statement
Definition: postgres.c:95
int StatementTimeout
Definition: proc.c:62
static bool EchoQuery
Definition: postgres.c:162
char * stack_base_ptr
Definition: postgres.c:119
static const char * userDoption
Definition: postgres.c:161
bool IsSubTransaction(void)
Definition: xact.c:4689
bool atStart
Definition: portal.h:188
static bool UseSemiNewlineNewline
Definition: postgres.c:163
#define CURSOR_OPT_PARALLEL_OK
Definition: parsenodes.h:2691
void SetCurrentStatementStartTimestamp(void)
Definition: xact.c:819
char * remote_host
Definition: libpq-be.h:127
char * OidOutputFunctionCall(Oid functionId, Datum val)
Definition: fmgr.c:1655
#define GUC_check_errhint
Definition: guc.h:419
void * palloc(Size size)
Definition: mcxt.c:924
int errmsg(const char *fmt,...)
Definition: elog.c:784
void PortalDrop(Portal portal, bool isTopCommit)
Definition: portalmem.c:465
void ReadyForQuery(CommandDest dest)
Definition: dest.c:250
void pq_endmessage(StringInfo buf)
Definition: pqformat.c:298
char * optarg
Definition: getopt.c:52
void die(SIGNAL_ARGS)
Definition: postgres.c:2754
bool IsLogicalLauncher(void)
Definition: launcher.c:1088
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:116
#define elog(elevel,...)
Definition: elog.h:226
int i
void FloatExceptionHandler(SIGNAL_ARGS)
Definition: postgres.c:2806
static void drop_unnamed_stmt(void)
Definition: postgres.c:2662
bool Debug_pretty_print
Definition: guc.c:489
char * name
Definition: parsenodes.h:3385
char * nodeToString(const void *obj)
Definition: outfuncs.c:4296
ProcSignalReason
Definition: procsignal.h:30
int pq_getstring(StringInfo s)
Definition: pqcomm.c:1167
void * arg
void DropCachedPlan(CachedPlanSource *plansource)
Definition: plancache.c:496
struct Latch * MyLatch
Definition: globals.c:54
void ReplicationSlotCleanup(void)
Definition: slot.c:479
volatile sig_atomic_t notifyInterruptPending
Definition: async.c:357
unsigned int pq_getmsgint(StringInfo msg, int b)
Definition: pqformat.c:417
bool Debug_print_rewritten
Definition: guc.c:488
volatile sig_atomic_t catchupInterruptPending
Definition: sinval.c:41
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:99
bool Log_disconnections
Definition: postgres.c:93
static char format
Definition: pg_basebackup.c:89
List * stmt_list
Definition: plancache.h:146
void process_postgres_switches(int argc, char *argv[], GucContext ctx, const char **dbname)
Definition: postgres.c:3461
void pq_getmsgend(StringInfo msg)
Definition: pqformat.c:637
void disable_timeout(TimeoutId id, bool keep_indicator)
Definition: timeout.c:525
int cursorOptions
Definition: portal.h:144
#define copyObject(obj)
Definition: nodes.h:640
void procsignal_sigusr1_handler(SIGNAL_ARGS)
Definition: procsignal.c:261
CommandDest whereToSendOutput
Definition: postgres.c:90
List * FetchPortalTargetList(Portal portal)
Definition: pquery.c:336
void TimestampDifference(TimestampTz start_time, TimestampTz stop_time, long *secs, int *microsecs)
Definition: timestamp.c:1665
void free_parsestate(ParseState *pstate)
Definition: parse_node.c:77
static bool ignore_till_sync
Definition: postgres.c:146
char * database_name
Definition: libpq-be.h:140
void assign_max_stack_depth(int newval, void *extra)
Definition: postgres.c:3335
void SendRowDescriptionMessage(StringInfo buf, TupleDesc typeinfo, List *targetlist, int16 *formats)
Definition: printtup.c:201
PreparedStatement * FetchPreparedStatement(const char *stmt_name, bool throwError)
Definition: prepare.c:485
#define __darwin__
Definition: darwin.h:3
Definition: pg_list.h:45
bool isnull
Definition: params.h:93
#define snprintf
Definition: port.h:192
#define STACK_DEPTH_SLOP
Definition: tcopprot.h:31
void pq_endmessage_reuse(StringInfo buf)
Definition: pqformat.c:316
Datum OidInputFunctionCall(Oid functionId, char *str, Oid typioparam, int32 typmod)
Definition: fmgr.c:1646
int stmt_len
Definition: parsenodes.h:181
List * pg_plan_queries(List *querytrees, int cursorOptions, ParamListInfo boundParams)
Definition: postgres.c:946
static MemoryContext row_description_context
Definition: postgres.c:171
void quickdie(SIGNAL_ARGS)
Definition: postgres.c:2687
#define _(x)
Definition: elog.c:84
ProtocolVersion FrontendProtocol
Definition: globals.c:28
MemoryContext PostmasterContext
Definition: mcxt.c:46
long val
Definition: informix.c:689
post_parse_analyze_hook_type post_parse_analyze_hook
Definition: analyze.c:51
bool log_planner_stats
Definition: guc.c:492
static void exec_simple_query(const char *query_string)
Definition: postgres.c:984
#define PARAM_FLAG_CONST
Definition: params.h:88
const char * prepStmtName
Definition: portal.h:118
LogStmtLevel GetCommandLogLevel(Node *parsetree)
Definition: utility.c:2947
void NullCommand(CommandDest dest)
Definition: dest.c:207
void pq_beginmessage_reuse(StringInfo buf, char msgtype)
Definition: pqformat.c:108
TimestampTz GetCurrentStatementStartTimestamp(void)
Definition: xact.c:793
char * pg_stack_base_t
Definition: miscadmin.h:274
void InitializeGUCOptions(void)
Definition: guc.c:5130
bool stack_is_too_deep(void)
Definition: postgres.c:3269
TransactionStmtKind kind
Definition: parsenodes.h:3008
#define RESUME_CANCEL_INTERRUPTS()
Definition: miscadmin.h:126
void ProcessClientWriteInterrupt(bool blocked)
Definition: postgres.c:576
#define FETCH_ALL
Definition: parsenodes.h:2726
void pgstat_report_stat(bool force)
Definition: pgstat.c:813
void DropPreparedStatement(const char *stmt_name, bool showError)
Definition: prepare.c:570
static void exec_describe_statement_message(const char *stmt_name)
Definition: postgres.c:2416
PlannedStmt * pg_plan_query(Query *querytree, int cursorOptions, ParamListInfo boundParams)
Definition: postgres.c:861