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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) 1996-2017, 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 "libpq/libpq.h"
46 #include "libpq/pqformat.h"
47 #include "libpq/pqsignal.h"
48 #include "miscadmin.h"
49 #include "nodes/print.h"
50 #include "optimizer/planner.h"
51 #include "pgstat.h"
52 #include "pg_trace.h"
53 #include "parser/analyze.h"
54 #include "parser/parser.h"
55 #include "pg_getopt.h"
56 #include "postmaster/autovacuum.h"
57 #include "postmaster/postmaster.h"
60 #include "replication/slot.h"
61 #include "replication/walsender.h"
62 #include "rewrite/rewriteHandler.h"
63 #include "storage/bufmgr.h"
64 #include "storage/ipc.h"
65 #include "storage/proc.h"
66 #include "storage/procsignal.h"
67 #include "storage/sinval.h"
68 #include "tcop/fastpath.h"
69 #include "tcop/pquery.h"
70 #include "tcop/tcopprot.h"
71 #include "tcop/utility.h"
72 #include "utils/lsyscache.h"
73 #include "utils/memutils.h"
74 #include "utils/ps_status.h"
75 #include "utils/snapmgr.h"
76 #include "utils/timeout.h"
77 #include "utils/timestamp.h"
78 #include "mb/pg_wchar.h"
79 
80 
81 /* ----------------
82  * global variables
83  * ----------------
84  */
85 const char *debug_query_string; /* client-supplied query string */
86 
87 /* Note: whereToSendOutput is initialized for the bootstrap/standalone case */
89 
90 /* flag for logging end of session */
91 bool Log_disconnections = false;
92 
94 
95 /* GUC variable for maximum stack depth (measured in kilobytes) */
96 int max_stack_depth = 100;
97 
98 /* wait N seconds to allow attach from a debugger */
99 int PostAuthDelay = 0;
100 
101 
102 
103 /* ----------------
104  * private variables
105  * ----------------
106  */
107 
108 /* max_stack_depth converted to bytes for speed of checking */
109 static long max_stack_depth_bytes = 100 * 1024L;
110 
111 /*
112  * Stack base pointer -- initialized by PostmasterMain and inherited by
113  * subprocesses. This is not static because old versions of PL/Java modify
114  * it directly. Newer versions use set_stack_base(), but we want to stay
115  * binary-compatible for the time being.
116  */
118 
119 /*
120  * On IA64 we also have to remember the register stack base.
121  */
122 #if defined(__ia64__) || defined(__ia64)
123 char *register_stack_base_ptr = NULL;
124 #endif
125 
126 /*
127  * Flag to keep track of whether we have started a transaction.
128  * For extended query protocol this has to be remembered across messages.
129  */
130 static bool xact_started = false;
131 
132 /*
133  * Flag to indicate that we are doing the outer loop's read-from-client,
134  * as opposed to any random read from client that might happen within
135  * commands like COPY FROM STDIN.
136  */
137 static bool DoingCommandRead = false;
138 
139 /*
140  * Flags to implement skip-till-Sync-after-error behavior for messages of
141  * the extended query protocol.
142  */
143 static bool doing_extended_query_message = false;
144 static bool ignore_till_sync = false;
145 
146 /*
147  * If an unnamed prepared statement exists, it's stored here.
148  * We keep it separate from the hashtable kept by commands/prepare.c
149  * in order to reduce overhead for short-lived queries.
150  */
152 
153 /* assorted command-line switches */
154 static const char *userDoption = NULL; /* -D switch */
155 static bool EchoQuery = false; /* -E switch */
156 static bool UseSemiNewlineNewline = false; /* -j switch */
157 
158 /* whether or not, and why, we were canceled by conflict with recovery */
159 static bool RecoveryConflictPending = false;
160 static bool RecoveryConflictRetryable = true;
162 
163 /* ----------------------------------------------------------------
164  * decls for routines only used in this file
165  * ----------------------------------------------------------------
166  */
167 static int InteractiveBackend(StringInfo inBuf);
168 static int interactive_getc(void);
169 static int SocketBackend(StringInfo inBuf);
170 static int ReadCommand(StringInfo inBuf);
171 static void forbidden_in_wal_sender(char firstchar);
172 static List *pg_rewrite_query(Query *query);
173 static bool check_log_statement(List *stmt_list);
174 static int errdetail_execute(List *raw_parsetree_list);
175 static int errdetail_params(ParamListInfo params);
176 static int errdetail_abort(void);
177 static int errdetail_recovery_conflict(void);
178 static void start_xact_command(void);
179 static void finish_xact_command(void);
180 static bool IsTransactionExitStmt(Node *parsetree);
181 static bool IsTransactionExitStmtList(List *pstmts);
182 static bool IsTransactionStmtList(List *pstmts);
183 static void drop_unnamed_stmt(void);
184 static void log_disconnections(int code, Datum arg);
185 
186 
187 /* ----------------------------------------------------------------
188  * routines to obtain user input
189  * ----------------------------------------------------------------
190  */
191 
192 /* ----------------
193  * InteractiveBackend() is called for user interactive connections
194  *
195  * the string entered by the user is placed in its parameter inBuf,
196  * and we act like a Q message was received.
197  *
198  * EOF is returned if end-of-file input is seen; time to shut down.
199  * ----------------
200  */
201 
202 static int
204 {
205  int c; /* character read from getc() */
206 
207  /*
208  * display a prompt and obtain input from the user
209  */
210  printf("backend> ");
211  fflush(stdout);
212 
213  resetStringInfo(inBuf);
214 
215  /*
216  * Read characters until EOF or the appropriate delimiter is seen.
217  */
218  while ((c = interactive_getc()) != EOF)
219  {
220  if (c == '\n')
221  {
223  {
224  /*
225  * In -j mode, semicolon followed by two newlines ends the
226  * command; otherwise treat newline as regular character.
227  */
228  if (inBuf->len > 1 &&
229  inBuf->data[inBuf->len - 1] == '\n' &&
230  inBuf->data[inBuf->len - 2] == ';')
231  {
232  /* might as well drop the second newline */
233  break;
234  }
235  }
236  else
237  {
238  /*
239  * In plain mode, newline ends the command unless preceded by
240  * backslash.
241  */
242  if (inBuf->len > 0 &&
243  inBuf->data[inBuf->len - 1] == '\\')
244  {
245  /* discard backslash from inBuf */
246  inBuf->data[--inBuf->len] = '\0';
247  /* discard newline too */
248  continue;
249  }
250  else
251  {
252  /* keep the newline character, but end the command */
253  appendStringInfoChar(inBuf, '\n');
254  break;
255  }
256  }
257  }
258 
259  /* Not newline, or newline treated as regular character */
260  appendStringInfoChar(inBuf, (char) c);
261  }
262 
263  /* No input before EOF signal means time to quit. */
264  if (c == EOF && inBuf->len == 0)
265  return EOF;
266 
267  /*
268  * otherwise we have a user query so process it.
269  */
270 
271  /* Add '\0' to make it look the same as message case. */
272  appendStringInfoChar(inBuf, (char) '\0');
273 
274  /*
275  * if the query echo flag was given, print the query..
276  */
277  if (EchoQuery)
278  printf("statement: %s\n", inBuf->data);
279  fflush(stdout);
280 
281  return 'Q';
282 }
283 
284 /*
285  * interactive_getc -- collect one character from stdin
286  *
287  * Even though we are not reading from a "client" process, we still want to
288  * respond to signals, particularly SIGTERM/SIGQUIT.
289  */
290 static int
292 {
293  int c;
294 
295  /*
296  * This will not process catchup interrupts or notifications while
297  * reading. But those can't really be relevant for a standalone backend
298  * anyway. To properly handle SIGTERM there's a hack in die() that
299  * directly processes interrupts at this stage...
300  */
302 
303  c = getc(stdin);
304 
306 
307  return c;
308 }
309 
310 /* ----------------
311  * SocketBackend() Is called for frontend-backend connections
312  *
313  * Returns the message type code, and loads message body data into inBuf.
314  *
315  * EOF is returned if the connection is lost.
316  * ----------------
317  */
318 static int
320 {
321  int qtype;
322 
323  /*
324  * Get message type code from the frontend.
325  */
327  pq_startmsgread();
328  qtype = pq_getbyte();
329 
330  if (qtype == EOF) /* frontend disconnected */
331  {
332  if (IsTransactionState())
334  (errcode(ERRCODE_CONNECTION_FAILURE),
335  errmsg("unexpected EOF on client connection with an open transaction")));
336  else
337  {
338  /*
339  * Can't send DEBUG log messages to client at this point. Since
340  * we're disconnecting right away, we don't need to restore
341  * whereToSendOutput.
342  */
344  ereport(DEBUG1,
345  (errcode(ERRCODE_CONNECTION_DOES_NOT_EXIST),
346  errmsg("unexpected EOF on client connection")));
347  }
348  return qtype;
349  }
350 
351  /*
352  * Validate message type code before trying to read body; if we have lost
353  * sync, better to say "command unknown" than to run out of memory because
354  * we used garbage as a length word.
355  *
356  * This also gives us a place to set the doing_extended_query_message flag
357  * as soon as possible.
358  */
359  switch (qtype)
360  {
361  case 'Q': /* simple query */
364  {
365  /* old style without length word; convert */
366  if (pq_getstring(inBuf))
367  {
368  if (IsTransactionState())
370  (errcode(ERRCODE_CONNECTION_FAILURE),
371  errmsg("unexpected EOF on client connection with an open transaction")));
372  else
373  {
374  /*
375  * Can't send DEBUG log messages to client at this
376  * point. Since we're disconnecting right away, we
377  * don't need to restore whereToSendOutput.
378  */
380  ereport(DEBUG1,
381  (errcode(ERRCODE_CONNECTION_DOES_NOT_EXIST),
382  errmsg("unexpected EOF on client connection")));
383  }
384  return EOF;
385  }
386  }
387  break;
388 
389  case 'F': /* fastpath function call */
392  {
393  if (GetOldFunctionMessage(inBuf))
394  {
395  if (IsTransactionState())
397  (errcode(ERRCODE_CONNECTION_FAILURE),
398  errmsg("unexpected EOF on client connection with an open transaction")));
399  else
400  {
401  /*
402  * Can't send DEBUG log messages to client at this
403  * point. Since we're disconnecting right away, we
404  * don't need to restore whereToSendOutput.
405  */
407  ereport(DEBUG1,
408  (errcode(ERRCODE_CONNECTION_DOES_NOT_EXIST),
409  errmsg("unexpected EOF on client connection")));
410  }
411  return EOF;
412  }
413  }
414  break;
415 
416  case 'X': /* terminate */
418  ignore_till_sync = false;
419  break;
420 
421  case 'B': /* bind */
422  case 'C': /* close */
423  case 'D': /* describe */
424  case 'E': /* execute */
425  case 'H': /* flush */
426  case 'P': /* parse */
428  /* these are only legal in protocol 3 */
430  ereport(FATAL,
431  (errcode(ERRCODE_PROTOCOL_VIOLATION),
432  errmsg("invalid frontend message type %d", qtype)));
433  break;
434 
435  case 'S': /* sync */
436  /* stop any active skip-till-Sync */
437  ignore_till_sync = false;
438  /* mark not-extended, so that a new error doesn't begin skip */
440  /* only legal in protocol 3 */
442  ereport(FATAL,
443  (errcode(ERRCODE_PROTOCOL_VIOLATION),
444  errmsg("invalid frontend message type %d", qtype)));
445  break;
446 
447  case 'd': /* copy data */
448  case 'c': /* copy done */
449  case 'f': /* copy fail */
451  /* these are only legal in protocol 3 */
453  ereport(FATAL,
454  (errcode(ERRCODE_PROTOCOL_VIOLATION),
455  errmsg("invalid frontend message type %d", qtype)));
456  break;
457 
458  default:
459 
460  /*
461  * Otherwise we got garbage from the frontend. We treat this as
462  * fatal because we have probably lost message boundary sync, and
463  * there's no good way to recover.
464  */
465  ereport(FATAL,
466  (errcode(ERRCODE_PROTOCOL_VIOLATION),
467  errmsg("invalid frontend message type %d", qtype)));
468  break;
469  }
470 
471  /*
472  * In protocol version 3, all frontend messages have a length word next
473  * after the type code; we can read the message contents independently of
474  * the type.
475  */
477  {
478  if (pq_getmessage(inBuf, 0))
479  return EOF; /* suitable message already logged */
480  }
481  else
482  pq_endmsgread();
484 
485  return qtype;
486 }
487 
488 /* ----------------
489  * ReadCommand reads a command from either the frontend or
490  * standard input, places it in inBuf, and returns the
491  * message type code (first byte of the message).
492  * EOF is returned if end of file.
493  * ----------------
494  */
495 static int
497 {
498  int result;
499 
501  result = SocketBackend(inBuf);
502  else
503  result = InteractiveBackend(inBuf);
504  return result;
505 }
506 
507 /*
508  * ProcessClientReadInterrupt() - Process interrupts specific to client reads
509  *
510  * This is called just after low-level reads. That might be after the read
511  * finished successfully, or it was interrupted via interrupt.
512  *
513  * Must preserve errno!
514  */
515 void
517 {
518  int save_errno = errno;
519 
520  if (DoingCommandRead)
521  {
522  /* Check for general interrupts that arrived while reading */
524 
525  /* Process sinval catchup interrupts that happened while reading */
528 
529  /* Process sinval catchup interrupts that happened while reading */
532  }
533  else if (ProcDiePending && blocked)
534  {
535  /*
536  * We're dying. It's safe (and sane) to handle that now.
537  */
539  }
540 
541  errno = save_errno;
542 }
543 
544 /*
545  * ProcessClientWriteInterrupt() - Process interrupts specific to client writes
546  *
547  * This is called just after low-level writes. That might be after the read
548  * finished successfully, or it was interrupted via interrupt. 'blocked' tells
549  * us whether the
550  *
551  * Must preserve errno!
552  */
553 void
555 {
556  int save_errno = errno;
557 
558  /*
559  * We only want to process the interrupt here if socket writes are
560  * blocking to increase the chance to get an error message to the client.
561  * If we're not blocked there'll soon be a CHECK_FOR_INTERRUPTS(). But if
562  * we're blocked we'll never get out of that situation if the client has
563  * died.
564  */
565  if (ProcDiePending && blocked)
566  {
567  /*
568  * We're dying. It's safe (and sane) to handle that now. But we don't
569  * want to send the client the error message as that a) would possibly
570  * block again b) would possibly lead to sending an error message to
571  * the client, while we already started to send something else.
572  */
575 
577  }
578 
579  errno = save_errno;
580 }
581 
582 /*
583  * Do raw parsing (only).
584  *
585  * A list of parsetrees (RawStmt nodes) is returned, since there might be
586  * multiple commands in the given string.
587  *
588  * NOTE: for interactive queries, it is important to keep this routine
589  * separate from the analysis & rewrite stages. Analysis and rewriting
590  * cannot be done in an aborted transaction, since they require access to
591  * database tables. So, we rely on the raw parser to determine whether
592  * we've seen a COMMIT or ABORT command; when we are in abort state, other
593  * commands are not processed any further than the raw parse stage.
594  */
595 List *
596 pg_parse_query(const char *query_string)
597 {
598  List *raw_parsetree_list;
599 
600  TRACE_POSTGRESQL_QUERY_PARSE_START(query_string);
601 
602  if (log_parser_stats)
603  ResetUsage();
604 
605  raw_parsetree_list = raw_parser(query_string);
606 
607  if (log_parser_stats)
608  ShowUsage("PARSER STATISTICS");
609 
610 #ifdef COPY_PARSE_PLAN_TREES
611  /* Optional debugging check: pass raw parsetrees through copyObject() */
612  {
613  List *new_list = copyObject(raw_parsetree_list);
614 
615  /* This checks both copyObject() and the equal() routines... */
616  if (!equal(new_list, raw_parsetree_list))
617  elog(WARNING, "copyObject() failed to produce an equal raw parse tree");
618  else
619  raw_parsetree_list = new_list;
620  }
621 #endif
622 
623  TRACE_POSTGRESQL_QUERY_PARSE_DONE(query_string);
624 
625  return raw_parsetree_list;
626 }
627 
628 /*
629  * Given a raw parsetree (gram.y output), and optionally information about
630  * types of parameter symbols ($n), perform parse analysis and rule rewriting.
631  *
632  * A list of Query nodes is returned, since either the analyzer or the
633  * rewriter might expand one query to several.
634  *
635  * NOTE: for reasons mentioned above, this must be separate from raw parsing.
636  */
637 List *
638 pg_analyze_and_rewrite(RawStmt *parsetree, const char *query_string,
639  Oid *paramTypes, int numParams,
640  QueryEnvironment *queryEnv)
641 {
642  Query *query;
643  List *querytree_list;
644 
645  TRACE_POSTGRESQL_QUERY_REWRITE_START(query_string);
646 
647  /*
648  * (1) Perform parse analysis.
649  */
650  if (log_parser_stats)
651  ResetUsage();
652 
653  query = parse_analyze(parsetree, query_string, paramTypes, numParams,
654  queryEnv);
655 
656  if (log_parser_stats)
657  ShowUsage("PARSE ANALYSIS STATISTICS");
658 
659  /*
660  * (2) Rewrite the queries, as necessary
661  */
662  querytree_list = pg_rewrite_query(query);
663 
664  TRACE_POSTGRESQL_QUERY_REWRITE_DONE(query_string);
665 
666  return querytree_list;
667 }
668 
669 /*
670  * Do parse analysis and rewriting. This is the same as pg_analyze_and_rewrite
671  * except that external-parameter resolution is determined by parser callback
672  * hooks instead of a fixed list of parameter datatypes.
673  */
674 List *
676  const char *query_string,
677  ParserSetupHook parserSetup,
678  void *parserSetupArg,
679  QueryEnvironment *queryEnv)
680 {
681  ParseState *pstate;
682  Query *query;
683  List *querytree_list;
684 
685  Assert(query_string != NULL); /* required as of 8.4 */
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  pstate = make_parsestate(NULL);
696  pstate->p_sourcetext = query_string;
697  pstate->p_queryEnv = queryEnv;
698  (*parserSetup) (pstate, parserSetupArg);
699 
700  query = transformTopLevelStmt(pstate, parsetree);
701 
703  (*post_parse_analyze_hook) (pstate, query);
704 
705  free_parsestate(pstate);
706 
707  if (log_parser_stats)
708  ShowUsage("PARSE ANALYSIS STATISTICS");
709 
710  /*
711  * (2) Rewrite the queries, as necessary
712  */
713  querytree_list = pg_rewrite_query(query);
714 
715  TRACE_POSTGRESQL_QUERY_REWRITE_DONE(query_string);
716 
717  return querytree_list;
718 }
719 
720 /*
721  * Perform rewriting of a query produced by parse analysis.
722  *
723  * Note: query must just have come from the parser, because we do not do
724  * AcquireRewriteLocks() on it.
725  */
726 static List *
728 {
729  List *querytree_list;
730 
731  if (Debug_print_parse)
732  elog_node_display(LOG, "parse tree", query,
734 
735  if (log_parser_stats)
736  ResetUsage();
737 
738  if (query->commandType == CMD_UTILITY)
739  {
740  /* don't rewrite utilities, just dump 'em into result list */
741  querytree_list = list_make1(query);
742  }
743  else
744  {
745  /* rewrite regular queries */
746  querytree_list = QueryRewrite(query);
747  }
748 
749  if (log_parser_stats)
750  ShowUsage("REWRITER STATISTICS");
751 
752 #ifdef COPY_PARSE_PLAN_TREES
753  /* Optional debugging check: pass querytree output through copyObject() */
754  {
755  List *new_list;
756 
757  new_list = copyObject(querytree_list);
758  /* This checks both copyObject() and the equal() routines... */
759  if (!equal(new_list, querytree_list))
760  elog(WARNING, "copyObject() failed to produce equal parse tree");
761  else
762  querytree_list = new_list;
763  }
764 #endif
765 
767  elog_node_display(LOG, "rewritten parse tree", querytree_list,
769 
770  return querytree_list;
771 }
772 
773 
774 /*
775  * Generate a plan for a single already-rewritten query.
776  * This is a thin wrapper around planner() and takes the same parameters.
777  */
778 PlannedStmt *
779 pg_plan_query(Query *querytree, int cursorOptions, ParamListInfo boundParams)
780 {
781  PlannedStmt *plan;
782 
783  /* Utility commands have no plans. */
784  if (querytree->commandType == CMD_UTILITY)
785  return NULL;
786 
787  /* Planner must have a snapshot in case it calls user-defined functions. */
789 
790  TRACE_POSTGRESQL_QUERY_PLAN_START();
791 
792  if (log_planner_stats)
793  ResetUsage();
794 
795  /* call the optimizer */
796  plan = planner(querytree, cursorOptions, boundParams);
797 
798  if (log_planner_stats)
799  ShowUsage("PLANNER STATISTICS");
800 
801 #ifdef COPY_PARSE_PLAN_TREES
802  /* Optional debugging check: pass plan output through copyObject() */
803  {
804  PlannedStmt *new_plan = copyObject(plan);
805 
806  /*
807  * equal() currently does not have routines to compare Plan nodes, so
808  * don't try to test equality here. Perhaps fix someday?
809  */
810 #ifdef NOT_USED
811  /* This checks both copyObject() and the equal() routines... */
812  if (!equal(new_plan, plan))
813  elog(WARNING, "copyObject() failed to produce an equal plan tree");
814  else
815 #endif
816  plan = new_plan;
817  }
818 #endif
819 
820  /*
821  * Print plan if debugging.
822  */
823  if (Debug_print_plan)
824  elog_node_display(LOG, "plan", plan, Debug_pretty_print);
825 
826  TRACE_POSTGRESQL_QUERY_PLAN_DONE();
827 
828  return plan;
829 }
830 
831 /*
832  * Generate plans for a list of already-rewritten queries.
833  *
834  * For normal optimizable statements, invoke the planner. For utility
835  * statements, just make a wrapper PlannedStmt node.
836  *
837  * The result is a list of PlannedStmt nodes.
838  */
839 List *
840 pg_plan_queries(List *querytrees, int cursorOptions, ParamListInfo boundParams)
841 {
842  List *stmt_list = NIL;
843  ListCell *query_list;
844 
845  foreach(query_list, querytrees)
846  {
847  Query *query = lfirst_node(Query, query_list);
848  PlannedStmt *stmt;
849 
850  if (query->commandType == CMD_UTILITY)
851  {
852  /* Utility commands require no planning. */
853  stmt = makeNode(PlannedStmt);
854  stmt->commandType = CMD_UTILITY;
855  stmt->canSetTag = query->canSetTag;
856  stmt->utilityStmt = query->utilityStmt;
857  stmt->stmt_location = query->stmt_location;
858  stmt->stmt_len = query->stmt_len;
859  }
860  else
861  {
862  stmt = pg_plan_query(query, cursorOptions, boundParams);
863  }
864 
865  stmt_list = lappend(stmt_list, stmt);
866  }
867 
868  return stmt_list;
869 }
870 
871 
872 /*
873  * exec_simple_query
874  *
875  * Execute a "simple Query" protocol message.
876  */
877 static void
878 exec_simple_query(const char *query_string)
879 {
881  MemoryContext oldcontext;
882  List *parsetree_list;
883  ListCell *parsetree_item;
884  bool save_log_statement_stats = log_statement_stats;
885  bool was_logged = false;
886  bool isTopLevel;
887  char msec_str[32];
888 
889 
890  /*
891  * Report query to various monitoring facilities.
892  */
893  debug_query_string = query_string;
894 
895  pgstat_report_activity(STATE_RUNNING, query_string);
896 
897  TRACE_POSTGRESQL_QUERY_START(query_string);
898 
899  /*
900  * We use save_log_statement_stats so ShowUsage doesn't report incorrect
901  * results because ResetUsage wasn't called.
902  */
903  if (save_log_statement_stats)
904  ResetUsage();
905 
906  /*
907  * Start up a transaction command. All queries generated by the
908  * query_string will be in this same command block, *unless* we find a
909  * BEGIN/COMMIT/ABORT statement; we have to force a new xact command after
910  * one of those, else bad things will happen in xact.c. (Note that this
911  * will normally change current memory context.)
912  */
914 
915  /*
916  * Zap any pre-existing unnamed statement. (While not strictly necessary,
917  * it seems best to define simple-Query mode as if it used the unnamed
918  * statement and portal; this ensures we recover any storage used by prior
919  * unnamed operations.)
920  */
922 
923  /*
924  * Switch to appropriate context for constructing parsetrees.
925  */
927 
928  /*
929  * Do basic parsing of the query or queries (this should be safe even if
930  * we are in aborted transaction state!)
931  */
932  parsetree_list = pg_parse_query(query_string);
933 
934  /* Log immediately if dictated by log_statement */
935  if (check_log_statement(parsetree_list))
936  {
937  ereport(LOG,
938  (errmsg("statement: %s", query_string),
939  errhidestmt(true),
940  errdetail_execute(parsetree_list)));
941  was_logged = true;
942  }
943 
944  /*
945  * Switch back to transaction context to enter the loop.
946  */
947  MemoryContextSwitchTo(oldcontext);
948 
949  /*
950  * We'll tell PortalRun it's a top-level command iff there's exactly one
951  * raw parsetree. If more than one, it's effectively a transaction block
952  * and we want PreventTransactionChain to reject unsafe commands. (Note:
953  * we're assuming that query rewrite cannot add commands that are
954  * significant to PreventTransactionChain.)
955  */
956  isTopLevel = (list_length(parsetree_list) == 1);
957 
958  /*
959  * Run through the raw parsetree(s) and process each one.
960  */
961  foreach(parsetree_item, parsetree_list)
962  {
963  RawStmt *parsetree = lfirst_node(RawStmt, parsetree_item);
964  bool snapshot_set = false;
965  const char *commandTag;
966  char completionTag[COMPLETION_TAG_BUFSIZE];
967  List *querytree_list,
968  *plantree_list;
969  Portal portal;
970  DestReceiver *receiver;
971  int16 format;
972 
973  /*
974  * Get the command name for use in status display (it also becomes the
975  * default completion tag, down inside PortalRun). Set ps_status and
976  * do any special start-of-SQL-command processing needed by the
977  * destination.
978  */
979  commandTag = CreateCommandTag(parsetree->stmt);
980 
981  set_ps_display(commandTag, false);
982 
983  BeginCommand(commandTag, dest);
984 
985  /*
986  * If we are in an aborted transaction, reject all commands except
987  * COMMIT/ABORT. It is important that this test occur before we try
988  * to do parse analysis, rewrite, or planning, since all those phases
989  * try to do database accesses, which may fail in abort state. (It
990  * might be safe to allow some additional utility commands in this
991  * state, but not many...)
992  */
994  !IsTransactionExitStmt(parsetree->stmt))
995  ereport(ERROR,
996  (errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
997  errmsg("current transaction is aborted, "
998  "commands ignored until end of transaction block"),
999  errdetail_abort()));
1000 
1001  /* Make sure we are in a transaction command */
1003 
1004  /* If we got a cancel signal in parsing or prior command, quit */
1006 
1007  /*
1008  * Set up a snapshot if parse analysis/planning will need one.
1009  */
1010  if (analyze_requires_snapshot(parsetree))
1011  {
1013  snapshot_set = true;
1014  }
1015 
1016  /*
1017  * OK to analyze, rewrite, and plan this query.
1018  *
1019  * Switch to appropriate context for constructing querytrees (again,
1020  * these must outlive the execution context).
1021  */
1022  oldcontext = MemoryContextSwitchTo(MessageContext);
1023 
1024  querytree_list = pg_analyze_and_rewrite(parsetree, query_string,
1025  NULL, 0, NULL);
1026 
1027  plantree_list = pg_plan_queries(querytree_list,
1029 
1030  /* Done with the snapshot used for parsing/planning */
1031  if (snapshot_set)
1033 
1034  /* If we got a cancel signal in analysis or planning, quit */
1036 
1037  /*
1038  * Create unnamed portal to run the query or queries in. If there
1039  * already is one, silently drop it.
1040  */
1041  portal = CreatePortal("", true, true);
1042  /* Don't display the portal in pg_cursors */
1043  portal->visible = false;
1044 
1045  /*
1046  * We don't have to copy anything into the portal, because everything
1047  * we are passing here is in MessageContext, which will outlive the
1048  * portal anyway.
1049  */
1050  PortalDefineQuery(portal,
1051  NULL,
1052  query_string,
1053  commandTag,
1054  plantree_list,
1055  NULL);
1056 
1057  /*
1058  * Start the portal. No parameters here.
1059  */
1060  PortalStart(portal, NULL, 0, InvalidSnapshot);
1061 
1062  /*
1063  * Select the appropriate output format: text unless we are doing a
1064  * FETCH from a binary cursor. (Pretty grotty to have to do this here
1065  * --- but it avoids grottiness in other places. Ah, the joys of
1066  * backward compatibility...)
1067  */
1068  format = 0; /* TEXT is default */
1069  if (IsA(parsetree->stmt, FetchStmt))
1070  {
1071  FetchStmt *stmt = (FetchStmt *) parsetree->stmt;
1072 
1073  if (!stmt->ismove)
1074  {
1075  Portal fportal = GetPortalByName(stmt->portalname);
1076 
1077  if (PortalIsValid(fportal) &&
1078  (fportal->cursorOptions & CURSOR_OPT_BINARY))
1079  format = 1; /* BINARY */
1080  }
1081  }
1082  PortalSetResultFormat(portal, 1, &format);
1083 
1084  /*
1085  * Now we can create the destination receiver object.
1086  */
1087  receiver = CreateDestReceiver(dest);
1088  if (dest == DestRemote)
1089  SetRemoteDestReceiverParams(receiver, portal);
1090 
1091  /*
1092  * Switch back to transaction context for execution.
1093  */
1094  MemoryContextSwitchTo(oldcontext);
1095 
1096  /*
1097  * Run the portal to completion, and then drop it (and the receiver).
1098  */
1099  (void) PortalRun(portal,
1100  FETCH_ALL,
1101  isTopLevel,
1102  true,
1103  receiver,
1104  receiver,
1105  completionTag);
1106 
1107  (*receiver->rDestroy) (receiver);
1108 
1109  PortalDrop(portal, false);
1110 
1111  if (IsA(parsetree->stmt, TransactionStmt))
1112  {
1113  /*
1114  * If this was a transaction control statement, commit it. We will
1115  * start a new xact command for the next command (if any).
1116  */
1118  }
1119  else if (lnext(parsetree_item) == NULL)
1120  {
1121  /*
1122  * If this is the last parsetree of the query string, close down
1123  * transaction statement before reporting command-complete. This
1124  * is so that any end-of-transaction errors are reported before
1125  * the command-complete message is issued, to avoid confusing
1126  * clients who will expect either a command-complete message or an
1127  * error, not one and then the other. But for compatibility with
1128  * historical Postgres behavior, we do not force a transaction
1129  * boundary between queries appearing in a single query string.
1130  */
1132  }
1133  else
1134  {
1135  /*
1136  * We need a CommandCounterIncrement after every query, except
1137  * those that start or end a transaction block.
1138  */
1140  }
1141 
1142  /*
1143  * Tell client that we're done with this query. Note we emit exactly
1144  * one EndCommand report for each raw parsetree, thus one for each SQL
1145  * command the client sent, regardless of rewriting. (But a command
1146  * aborted by error will not send an EndCommand report at all.)
1147  */
1148  EndCommand(completionTag, dest);
1149  } /* end loop over parsetrees */
1150 
1151  /*
1152  * Close down transaction statement, if one is open.
1153  */
1155 
1156  /*
1157  * If there were no parsetrees, return EmptyQueryResponse message.
1158  */
1159  if (!parsetree_list)
1160  NullCommand(dest);
1161 
1162  /*
1163  * Emit duration logging if appropriate.
1164  */
1165  switch (check_log_duration(msec_str, was_logged))
1166  {
1167  case 1:
1168  ereport(LOG,
1169  (errmsg("duration: %s ms", msec_str),
1170  errhidestmt(true)));
1171  break;
1172  case 2:
1173  ereport(LOG,
1174  (errmsg("duration: %s ms statement: %s",
1175  msec_str, query_string),
1176  errhidestmt(true),
1177  errdetail_execute(parsetree_list)));
1178  break;
1179  }
1180 
1181  if (save_log_statement_stats)
1182  ShowUsage("QUERY STATISTICS");
1183 
1184  TRACE_POSTGRESQL_QUERY_DONE(query_string);
1185 
1187 }
1188 
1189 /*
1190  * exec_parse_message
1191  *
1192  * Execute a "Parse" protocol message.
1193  */
1194 static void
1195 exec_parse_message(const char *query_string, /* string to execute */
1196  const char *stmt_name, /* name for prepared stmt */
1197  Oid *paramTypes, /* parameter types */
1198  int numParams) /* number of parameters */
1199 {
1200  MemoryContext unnamed_stmt_context = NULL;
1201  MemoryContext oldcontext;
1202  List *parsetree_list;
1203  RawStmt *raw_parse_tree;
1204  const char *commandTag;
1205  List *querytree_list;
1206  CachedPlanSource *psrc;
1207  bool is_named;
1208  bool save_log_statement_stats = log_statement_stats;
1209  char msec_str[32];
1210 
1211  /*
1212  * Report query to various monitoring facilities.
1213  */
1214  debug_query_string = query_string;
1215 
1216  pgstat_report_activity(STATE_RUNNING, query_string);
1217 
1218  set_ps_display("PARSE", false);
1219 
1220  if (save_log_statement_stats)
1221  ResetUsage();
1222 
1223  ereport(DEBUG2,
1224  (errmsg("parse %s: %s",
1225  *stmt_name ? stmt_name : "<unnamed>",
1226  query_string)));
1227 
1228  /*
1229  * Start up a transaction command so we can run parse analysis etc. (Note
1230  * that this will normally change current memory context.) Nothing happens
1231  * if we are already in one.
1232  */
1234 
1235  /*
1236  * Switch to appropriate context for constructing parsetrees.
1237  *
1238  * We have two strategies depending on whether the prepared statement is
1239  * named or not. For a named prepared statement, we do parsing in
1240  * MessageContext and copy the finished trees into the prepared
1241  * statement's plancache entry; then the reset of MessageContext releases
1242  * temporary space used by parsing and rewriting. For an unnamed prepared
1243  * statement, we assume the statement isn't going to hang around long, so
1244  * getting rid of temp space quickly is probably not worth the costs of
1245  * copying parse trees. So in this case, we create the plancache entry's
1246  * query_context here, and do all the parsing work therein.
1247  */
1248  is_named = (stmt_name[0] != '\0');
1249  if (is_named)
1250  {
1251  /* Named prepared statement --- parse in MessageContext */
1252  oldcontext = MemoryContextSwitchTo(MessageContext);
1253  }
1254  else
1255  {
1256  /* Unnamed prepared statement --- release any prior unnamed stmt */
1258  /* Create context for parsing */
1259  unnamed_stmt_context =
1261  "unnamed prepared statement",
1263  oldcontext = MemoryContextSwitchTo(unnamed_stmt_context);
1264  }
1265 
1266  /*
1267  * Do basic parsing of the query or queries (this should be safe even if
1268  * we are in aborted transaction state!)
1269  */
1270  parsetree_list = pg_parse_query(query_string);
1271 
1272  /*
1273  * We only allow a single user statement in a prepared statement. This is
1274  * mainly to keep the protocol simple --- otherwise we'd need to worry
1275  * about multiple result tupdescs and things like that.
1276  */
1277  if (list_length(parsetree_list) > 1)
1278  ereport(ERROR,
1279  (errcode(ERRCODE_SYNTAX_ERROR),
1280  errmsg("cannot insert multiple commands into a prepared statement")));
1281 
1282  if (parsetree_list != NIL)
1283  {
1284  Query *query;
1285  bool snapshot_set = false;
1286  int i;
1287 
1288  raw_parse_tree = linitial_node(RawStmt, parsetree_list);
1289 
1290  /*
1291  * Get the command name for possible use in status display.
1292  */
1293  commandTag = CreateCommandTag(raw_parse_tree->stmt);
1294 
1295  /*
1296  * If we are in an aborted transaction, reject all commands except
1297  * COMMIT/ROLLBACK. It is important that this test occur before we
1298  * try to do parse analysis, rewrite, or planning, since all those
1299  * phases try to do database accesses, which may fail in abort state.
1300  * (It might be safe to allow some additional utility commands in this
1301  * state, but not many...)
1302  */
1304  !IsTransactionExitStmt(raw_parse_tree->stmt))
1305  ereport(ERROR,
1306  (errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
1307  errmsg("current transaction is aborted, "
1308  "commands ignored until end of transaction block"),
1309  errdetail_abort()));
1310 
1311  /*
1312  * Create the CachedPlanSource before we do parse analysis, since it
1313  * needs to see the unmodified raw parse tree.
1314  */
1315  psrc = CreateCachedPlan(raw_parse_tree, query_string, commandTag);
1316 
1317  /*
1318  * Set up a snapshot if parse analysis will need one.
1319  */
1320  if (analyze_requires_snapshot(raw_parse_tree))
1321  {
1323  snapshot_set = true;
1324  }
1325 
1326  /*
1327  * Analyze and rewrite the query. Note that the originally specified
1328  * parameter set is not required to be complete, so we have to use
1329  * parse_analyze_varparams().
1330  */
1331  if (log_parser_stats)
1332  ResetUsage();
1333 
1334  query = parse_analyze_varparams(raw_parse_tree,
1335  query_string,
1336  &paramTypes,
1337  &numParams);
1338 
1339  /*
1340  * Check all parameter types got determined.
1341  */
1342  for (i = 0; i < numParams; i++)
1343  {
1344  Oid ptype = paramTypes[i];
1345 
1346  if (ptype == InvalidOid || ptype == UNKNOWNOID)
1347  ereport(ERROR,
1348  (errcode(ERRCODE_INDETERMINATE_DATATYPE),
1349  errmsg("could not determine data type of parameter $%d",
1350  i + 1)));
1351  }
1352 
1353  if (log_parser_stats)
1354  ShowUsage("PARSE ANALYSIS STATISTICS");
1355 
1356  querytree_list = pg_rewrite_query(query);
1357 
1358  /* Done with the snapshot used for parsing */
1359  if (snapshot_set)
1361  }
1362  else
1363  {
1364  /* Empty input string. This is legal. */
1365  raw_parse_tree = NULL;
1366  commandTag = NULL;
1367  psrc = CreateCachedPlan(raw_parse_tree, query_string, commandTag);
1368  querytree_list = NIL;
1369  }
1370 
1371  /*
1372  * CachedPlanSource must be a direct child of MessageContext before we
1373  * reparent unnamed_stmt_context under it, else we have a disconnected
1374  * circular subgraph. Klugy, but less so than flipping contexts even more
1375  * above.
1376  */
1377  if (unnamed_stmt_context)
1379 
1380  /* Finish filling in the CachedPlanSource */
1381  CompleteCachedPlan(psrc,
1382  querytree_list,
1383  unnamed_stmt_context,
1384  paramTypes,
1385  numParams,
1386  NULL,
1387  NULL,
1388  CURSOR_OPT_PARALLEL_OK, /* allow parallel mode */
1389  true); /* fixed result */
1390 
1391  /* If we got a cancel signal during analysis, quit */
1393 
1394  if (is_named)
1395  {
1396  /*
1397  * Store the query as a prepared statement.
1398  */
1399  StorePreparedStatement(stmt_name, psrc, false);
1400  }
1401  else
1402  {
1403  /*
1404  * We just save the CachedPlanSource into unnamed_stmt_psrc.
1405  */
1406  SaveCachedPlan(psrc);
1407  unnamed_stmt_psrc = psrc;
1408  }
1409 
1410  MemoryContextSwitchTo(oldcontext);
1411 
1412  /*
1413  * We do NOT close the open transaction command here; that only happens
1414  * when the client sends Sync. Instead, do CommandCounterIncrement just
1415  * in case something happened during parse/plan.
1416  */
1418 
1419  /*
1420  * Send ParseComplete.
1421  */
1423  pq_putemptymessage('1');
1424 
1425  /*
1426  * Emit duration logging if appropriate.
1427  */
1428  switch (check_log_duration(msec_str, false))
1429  {
1430  case 1:
1431  ereport(LOG,
1432  (errmsg("duration: %s ms", msec_str),
1433  errhidestmt(true)));
1434  break;
1435  case 2:
1436  ereport(LOG,
1437  (errmsg("duration: %s ms parse %s: %s",
1438  msec_str,
1439  *stmt_name ? stmt_name : "<unnamed>",
1440  query_string),
1441  errhidestmt(true)));
1442  break;
1443  }
1444 
1445  if (save_log_statement_stats)
1446  ShowUsage("PARSE MESSAGE STATISTICS");
1447 
1449 }
1450 
1451 /*
1452  * exec_bind_message
1453  *
1454  * Process a "Bind" message to create a portal from a prepared statement
1455  */
1456 static void
1458 {
1459  const char *portal_name;
1460  const char *stmt_name;
1461  int numPFormats;
1462  int16 *pformats = NULL;
1463  int numParams;
1464  int numRFormats;
1465  int16 *rformats = NULL;
1466  CachedPlanSource *psrc;
1467  CachedPlan *cplan;
1468  Portal portal;
1469  char *query_string;
1470  char *saved_stmt_name;
1471  ParamListInfo params;
1472  MemoryContext oldContext;
1473  bool save_log_statement_stats = log_statement_stats;
1474  bool snapshot_set = false;
1475  char msec_str[32];
1476 
1477  /* Get the fixed part of the message */
1478  portal_name = pq_getmsgstring(input_message);
1479  stmt_name = pq_getmsgstring(input_message);
1480 
1481  ereport(DEBUG2,
1482  (errmsg("bind %s to %s",
1483  *portal_name ? portal_name : "<unnamed>",
1484  *stmt_name ? stmt_name : "<unnamed>")));
1485 
1486  /* Find prepared statement */
1487  if (stmt_name[0] != '\0')
1488  {
1489  PreparedStatement *pstmt;
1490 
1491  pstmt = FetchPreparedStatement(stmt_name, true);
1492  psrc = pstmt->plansource;
1493  }
1494  else
1495  {
1496  /* special-case the unnamed statement */
1497  psrc = unnamed_stmt_psrc;
1498  if (!psrc)
1499  ereport(ERROR,
1500  (errcode(ERRCODE_UNDEFINED_PSTATEMENT),
1501  errmsg("unnamed prepared statement does not exist")));
1502  }
1503 
1504  /*
1505  * Report query to various monitoring facilities.
1506  */
1508 
1510 
1511  set_ps_display("BIND", false);
1512 
1513  if (save_log_statement_stats)
1514  ResetUsage();
1515 
1516  /*
1517  * Start up a transaction command so we can call functions etc. (Note that
1518  * this will normally change current memory context.) Nothing happens if
1519  * we are already in one.
1520  */
1522 
1523  /* Switch back to message context */
1525 
1526  /* Get the parameter format codes */
1527  numPFormats = pq_getmsgint(input_message, 2);
1528  if (numPFormats > 0)
1529  {
1530  int i;
1531 
1532  pformats = (int16 *) palloc(numPFormats * sizeof(int16));
1533  for (i = 0; i < numPFormats; i++)
1534  pformats[i] = pq_getmsgint(input_message, 2);
1535  }
1536 
1537  /* Get the parameter value count */
1538  numParams = pq_getmsgint(input_message, 2);
1539 
1540  if (numPFormats > 1 && numPFormats != numParams)
1541  ereport(ERROR,
1542  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1543  errmsg("bind message has %d parameter formats but %d parameters",
1544  numPFormats, numParams)));
1545 
1546  if (numParams != psrc->num_params)
1547  ereport(ERROR,
1548  (errcode(ERRCODE_PROTOCOL_VIOLATION),
1549  errmsg("bind message supplies %d parameters, but prepared statement \"%s\" requires %d",
1550  numParams, stmt_name, psrc->num_params)));
1551 
1552  /*
1553  * If we are in aborted transaction state, the only portals we can
1554  * actually run are those containing COMMIT or ROLLBACK commands. We
1555  * disallow binding anything else to avoid problems with infrastructure
1556  * that expects to run inside a valid transaction. We also disallow
1557  * binding any parameters, since we can't risk calling user-defined I/O
1558  * functions.
1559  */
1561  (!(psrc->raw_parse_tree &&
1563  numParams != 0))
1564  ereport(ERROR,
1565  (errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
1566  errmsg("current transaction is aborted, "
1567  "commands ignored until end of transaction block"),
1568  errdetail_abort()));
1569 
1570  /*
1571  * Create the portal. Allow silent replacement of an existing portal only
1572  * if the unnamed portal is specified.
1573  */
1574  if (portal_name[0] == '\0')
1575  portal = CreatePortal(portal_name, true, true);
1576  else
1577  portal = CreatePortal(portal_name, false, false);
1578 
1579  /*
1580  * Prepare to copy stuff into the portal's memory context. We do all this
1581  * copying first, because it could possibly fail (out-of-memory) and we
1582  * don't want a failure to occur between GetCachedPlan and
1583  * PortalDefineQuery; that would result in leaking our plancache refcount.
1584  */
1585  oldContext = MemoryContextSwitchTo(PortalGetHeapMemory(portal));
1586 
1587  /* Copy the plan's query string into the portal */
1588  query_string = pstrdup(psrc->query_string);
1589 
1590  /* Likewise make a copy of the statement name, unless it's unnamed */
1591  if (stmt_name[0])
1592  saved_stmt_name = pstrdup(stmt_name);
1593  else
1594  saved_stmt_name = NULL;
1595 
1596  /*
1597  * Set a snapshot if we have parameters to fetch (since the input
1598  * functions might need it) or the query isn't a utility command (and
1599  * hence could require redoing parse analysis and planning). We keep the
1600  * snapshot active till we're done, so that plancache.c doesn't have to
1601  * take new ones.
1602  */
1603  if (numParams > 0 ||
1604  (psrc->raw_parse_tree &&
1606  {
1608  snapshot_set = true;
1609  }
1610 
1611  /*
1612  * Fetch parameters, if any, and store in the portal's memory context.
1613  */
1614  if (numParams > 0)
1615  {
1616  int paramno;
1617 
1618  params = (ParamListInfo) palloc(offsetof(ParamListInfoData, params) +
1619  numParams * sizeof(ParamExternData));
1620  /* we have static list of params, so no hooks needed */
1621  params->paramFetch = NULL;
1622  params->paramFetchArg = NULL;
1623  params->parserSetup = NULL;
1624  params->parserSetupArg = NULL;
1625  params->numParams = numParams;
1626  params->paramMask = NULL;
1627 
1628  for (paramno = 0; paramno < numParams; paramno++)
1629  {
1630  Oid ptype = psrc->param_types[paramno];
1631  int32 plength;
1632  Datum pval;
1633  bool isNull;
1634  StringInfoData pbuf;
1635  char csave;
1636  int16 pformat;
1637 
1638  plength = pq_getmsgint(input_message, 4);
1639  isNull = (plength == -1);
1640 
1641  if (!isNull)
1642  {
1643  const char *pvalue = pq_getmsgbytes(input_message, plength);
1644 
1645  /*
1646  * Rather than copying data around, we just set up a phony
1647  * StringInfo pointing to the correct portion of the message
1648  * buffer. We assume we can scribble on the message buffer so
1649  * as to maintain the convention that StringInfos have a
1650  * trailing null. This is grotty but is a big win when
1651  * dealing with very large parameter strings.
1652  */
1653  pbuf.data = (char *) pvalue;
1654  pbuf.maxlen = plength + 1;
1655  pbuf.len = plength;
1656  pbuf.cursor = 0;
1657 
1658  csave = pbuf.data[plength];
1659  pbuf.data[plength] = '\0';
1660  }
1661  else
1662  {
1663  pbuf.data = NULL; /* keep compiler quiet */
1664  csave = 0;
1665  }
1666 
1667  if (numPFormats > 1)
1668  pformat = pformats[paramno];
1669  else if (numPFormats > 0)
1670  pformat = pformats[0];
1671  else
1672  pformat = 0; /* default = text */
1673 
1674  if (pformat == 0) /* text mode */
1675  {
1676  Oid typinput;
1677  Oid typioparam;
1678  char *pstring;
1679 
1680  getTypeInputInfo(ptype, &typinput, &typioparam);
1681 
1682  /*
1683  * We have to do encoding conversion before calling the
1684  * typinput routine.
1685  */
1686  if (isNull)
1687  pstring = NULL;
1688  else
1689  pstring = pg_client_to_server(pbuf.data, plength);
1690 
1691  pval = OidInputFunctionCall(typinput, pstring, typioparam, -1);
1692 
1693  /* Free result of encoding conversion, if any */
1694  if (pstring && pstring != pbuf.data)
1695  pfree(pstring);
1696  }
1697  else if (pformat == 1) /* binary mode */
1698  {
1699  Oid typreceive;
1700  Oid typioparam;
1701  StringInfo bufptr;
1702 
1703  /*
1704  * Call the parameter type's binary input converter
1705  */
1706  getTypeBinaryInputInfo(ptype, &typreceive, &typioparam);
1707 
1708  if (isNull)
1709  bufptr = NULL;
1710  else
1711  bufptr = &pbuf;
1712 
1713  pval = OidReceiveFunctionCall(typreceive, bufptr, typioparam, -1);
1714 
1715  /* Trouble if it didn't eat the whole buffer */
1716  if (!isNull && pbuf.cursor != pbuf.len)
1717  ereport(ERROR,
1718  (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
1719  errmsg("incorrect binary data format in bind parameter %d",
1720  paramno + 1)));
1721  }
1722  else
1723  {
1724  ereport(ERROR,
1725  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1726  errmsg("unsupported format code: %d",
1727  pformat)));
1728  pval = 0; /* keep compiler quiet */
1729  }
1730 
1731  /* Restore message buffer contents */
1732  if (!isNull)
1733  pbuf.data[plength] = csave;
1734 
1735  params->params[paramno].value = pval;
1736  params->params[paramno].isnull = isNull;
1737 
1738  /*
1739  * We mark the params as CONST. This ensures that any custom plan
1740  * makes full use of the parameter values.
1741  */
1742  params->params[paramno].pflags = PARAM_FLAG_CONST;
1743  params->params[paramno].ptype = ptype;
1744  }
1745  }
1746  else
1747  params = NULL;
1748 
1749  /* Done storing stuff in portal's context */
1750  MemoryContextSwitchTo(oldContext);
1751 
1752  /* Get the result format codes */
1753  numRFormats = pq_getmsgint(input_message, 2);
1754  if (numRFormats > 0)
1755  {
1756  int i;
1757 
1758  rformats = (int16 *) palloc(numRFormats * sizeof(int16));
1759  for (i = 0; i < numRFormats; i++)
1760  rformats[i] = pq_getmsgint(input_message, 2);
1761  }
1762 
1763  pq_getmsgend(input_message);
1764 
1765  /*
1766  * Obtain a plan from the CachedPlanSource. Any cruft from (re)planning
1767  * will be generated in MessageContext. The plan refcount will be
1768  * assigned to the Portal, so it will be released at portal destruction.
1769  */
1770  cplan = GetCachedPlan(psrc, params, false, NULL);
1771 
1772  /*
1773  * Now we can define the portal.
1774  *
1775  * DO NOT put any code that could possibly throw an error between the
1776  * above GetCachedPlan call and here.
1777  */
1778  PortalDefineQuery(portal,
1779  saved_stmt_name,
1780  query_string,
1781  psrc->commandTag,
1782  cplan->stmt_list,
1783  cplan);
1784 
1785  /* Done with the snapshot used for parameter I/O and parsing/planning */
1786  if (snapshot_set)
1788 
1789  /*
1790  * And we're ready to start portal execution.
1791  */
1792  PortalStart(portal, params, 0, InvalidSnapshot);
1793 
1794  /*
1795  * Apply the result format requests to the portal.
1796  */
1797  PortalSetResultFormat(portal, numRFormats, rformats);
1798 
1799  /*
1800  * Send BindComplete.
1801  */
1803  pq_putemptymessage('2');
1804 
1805  /*
1806  * Emit duration logging if appropriate.
1807  */
1808  switch (check_log_duration(msec_str, false))
1809  {
1810  case 1:
1811  ereport(LOG,
1812  (errmsg("duration: %s ms", msec_str),
1813  errhidestmt(true)));
1814  break;
1815  case 2:
1816  ereport(LOG,
1817  (errmsg("duration: %s ms bind %s%s%s: %s",
1818  msec_str,
1819  *stmt_name ? stmt_name : "<unnamed>",
1820  *portal_name ? "/" : "",
1821  *portal_name ? portal_name : "",
1822  psrc->query_string),
1823  errhidestmt(true),
1824  errdetail_params(params)));
1825  break;
1826  }
1827 
1828  if (save_log_statement_stats)
1829  ShowUsage("BIND MESSAGE STATISTICS");
1830 
1832 }
1833 
1834 /*
1835  * exec_execute_message
1836  *
1837  * Process an "Execute" message for a portal
1838  */
1839 static void
1840 exec_execute_message(const char *portal_name, long max_rows)
1841 {
1842  CommandDest dest;
1843  DestReceiver *receiver;
1844  Portal portal;
1845  bool completed;
1846  char completionTag[COMPLETION_TAG_BUFSIZE];
1847  const char *sourceText;
1848  const char *prepStmtName;
1849  ParamListInfo portalParams;
1850  bool save_log_statement_stats = log_statement_stats;
1851  bool is_xact_command;
1852  bool execute_is_fetch;
1853  bool was_logged = false;
1854  char msec_str[32];
1855 
1856  /* Adjust destination to tell printtup.c what to do */
1857  dest = whereToSendOutput;
1858  if (dest == DestRemote)
1859  dest = DestRemoteExecute;
1860 
1861  portal = GetPortalByName(portal_name);
1862  if (!PortalIsValid(portal))
1863  ereport(ERROR,
1864  (errcode(ERRCODE_UNDEFINED_CURSOR),
1865  errmsg("portal \"%s\" does not exist", portal_name)));
1866 
1867  /*
1868  * If the original query was a null string, just return
1869  * EmptyQueryResponse.
1870  */
1871  if (portal->commandTag == NULL)
1872  {
1873  Assert(portal->stmts == NIL);
1874  NullCommand(dest);
1875  return;
1876  }
1877 
1878  /* Does the portal contain a transaction command? */
1879  is_xact_command = IsTransactionStmtList(portal->stmts);
1880 
1881  /*
1882  * We must copy the sourceText and prepStmtName into MessageContext in
1883  * case the portal is destroyed during finish_xact_command. Can avoid the
1884  * copy if it's not an xact command, though.
1885  */
1886  if (is_xact_command)
1887  {
1888  sourceText = pstrdup(portal->sourceText);
1889  if (portal->prepStmtName)
1890  prepStmtName = pstrdup(portal->prepStmtName);
1891  else
1892  prepStmtName = "<unnamed>";
1893 
1894  /*
1895  * An xact command shouldn't have any parameters, which is a good
1896  * thing because they wouldn't be around after finish_xact_command.
1897  */
1898  portalParams = NULL;
1899  }
1900  else
1901  {
1902  sourceText = portal->sourceText;
1903  if (portal->prepStmtName)
1904  prepStmtName = portal->prepStmtName;
1905  else
1906  prepStmtName = "<unnamed>";
1907  portalParams = portal->portalParams;
1908  }
1909 
1910  /*
1911  * Report query to various monitoring facilities.
1912  */
1913  debug_query_string = sourceText;
1914 
1916 
1917  set_ps_display(portal->commandTag, false);
1918 
1919  if (save_log_statement_stats)
1920  ResetUsage();
1921 
1922  BeginCommand(portal->commandTag, dest);
1923 
1924  /*
1925  * Create dest receiver in MessageContext (we don't want it in transaction
1926  * context, because that may get deleted if portal contains VACUUM).
1927  */
1928  receiver = CreateDestReceiver(dest);
1929  if (dest == DestRemoteExecute)
1930  SetRemoteDestReceiverParams(receiver, portal);
1931 
1932  /*
1933  * Ensure we are in a transaction command (this should normally be the
1934  * case already due to prior BIND).
1935  */
1937 
1938  /*
1939  * If we re-issue an Execute protocol request against an existing portal,
1940  * then we are only fetching more rows rather than completely re-executing
1941  * the query from the start. atStart is never reset for a v3 portal, so we
1942  * are safe to use this check.
1943  */
1944  execute_is_fetch = !portal->atStart;
1945 
1946  /* Log immediately if dictated by log_statement */
1947  if (check_log_statement(portal->stmts))
1948  {
1949  ereport(LOG,
1950  (errmsg("%s %s%s%s: %s",
1951  execute_is_fetch ?
1952  _("execute fetch from") :
1953  _("execute"),
1954  prepStmtName,
1955  *portal_name ? "/" : "",
1956  *portal_name ? portal_name : "",
1957  sourceText),
1958  errhidestmt(true),
1959  errdetail_params(portalParams)));
1960  was_logged = true;
1961  }
1962 
1963  /*
1964  * If we are in aborted transaction state, the only portals we can
1965  * actually run are those containing COMMIT or ROLLBACK commands.
1966  */
1968  !IsTransactionExitStmtList(portal->stmts))
1969  ereport(ERROR,
1970  (errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
1971  errmsg("current transaction is aborted, "
1972  "commands ignored until end of transaction block"),
1973  errdetail_abort()));
1974 
1975  /* Check for cancel signal before we start execution */
1977 
1978  /*
1979  * Okay to run the portal.
1980  */
1981  if (max_rows <= 0)
1982  max_rows = FETCH_ALL;
1983 
1984  completed = PortalRun(portal,
1985  max_rows,
1986  true, /* always top level */
1987  !execute_is_fetch && max_rows == FETCH_ALL,
1988  receiver,
1989  receiver,
1990  completionTag);
1991 
1992  (*receiver->rDestroy) (receiver);
1993 
1994  if (completed)
1995  {
1996  if (is_xact_command)
1997  {
1998  /*
1999  * If this was a transaction control statement, commit it. We
2000  * will start a new xact command for the next command (if any).
2001  */
2003  }
2004  else
2005  {
2006  /*
2007  * We need a CommandCounterIncrement after every query, except
2008  * those that start or end a transaction block.
2009  */
2011  }
2012 
2013  /* Send appropriate CommandComplete to client */
2014  EndCommand(completionTag, dest);
2015  }
2016  else
2017  {
2018  /* Portal run not complete, so send PortalSuspended */
2020  pq_putemptymessage('s');
2021  }
2022 
2023  /*
2024  * Emit duration logging if appropriate.
2025  */
2026  switch (check_log_duration(msec_str, was_logged))
2027  {
2028  case 1:
2029  ereport(LOG,
2030  (errmsg("duration: %s ms", msec_str),
2031  errhidestmt(true)));
2032  break;
2033  case 2:
2034  ereport(LOG,
2035  (errmsg("duration: %s ms %s %s%s%s: %s",
2036  msec_str,
2037  execute_is_fetch ?
2038  _("execute fetch from") :
2039  _("execute"),
2040  prepStmtName,
2041  *portal_name ? "/" : "",
2042  *portal_name ? portal_name : "",
2043  sourceText),
2044  errhidestmt(true),
2045  errdetail_params(portalParams)));
2046  break;
2047  }
2048 
2049  if (save_log_statement_stats)
2050  ShowUsage("EXECUTE MESSAGE STATISTICS");
2051 
2053 }
2054 
2055 /*
2056  * check_log_statement
2057  * Determine whether command should be logged because of log_statement
2058  *
2059  * stmt_list can be either raw grammar output or a list of planned
2060  * statements
2061  */
2062 static bool
2064 {
2065  ListCell *stmt_item;
2066 
2067  if (log_statement == LOGSTMT_NONE)
2068  return false;
2069  if (log_statement == LOGSTMT_ALL)
2070  return true;
2071 
2072  /* Else we have to inspect the statement(s) to see whether to log */
2073  foreach(stmt_item, stmt_list)
2074  {
2075  Node *stmt = (Node *) lfirst(stmt_item);
2076 
2077  if (GetCommandLogLevel(stmt) <= log_statement)
2078  return true;
2079  }
2080 
2081  return false;
2082 }
2083 
2084 /*
2085  * check_log_duration
2086  * Determine whether current command's duration should be logged
2087  *
2088  * Returns:
2089  * 0 if no logging is needed
2090  * 1 if just the duration should be logged
2091  * 2 if duration and query details should be logged
2092  *
2093  * If logging is needed, the duration in msec is formatted into msec_str[],
2094  * which must be a 32-byte buffer.
2095  *
2096  * was_logged should be TRUE if caller already logged query details (this
2097  * essentially prevents 2 from being returned).
2098  */
2099 int
2100 check_log_duration(char *msec_str, bool was_logged)
2101 {
2103  {
2104  long secs;
2105  int usecs;
2106  int msecs;
2107  bool exceeded;
2108 
2111  &secs, &usecs);
2112  msecs = usecs / 1000;
2113 
2114  /*
2115  * This odd-looking test for log_min_duration_statement being exceeded
2116  * is designed to avoid integer overflow with very long durations:
2117  * don't compute secs * 1000 until we've verified it will fit in int.
2118  */
2119  exceeded = (log_min_duration_statement == 0 ||
2121  (secs > log_min_duration_statement / 1000 ||
2122  secs * 1000 + msecs >= log_min_duration_statement)));
2123 
2124  if (exceeded || log_duration)
2125  {
2126  snprintf(msec_str, 32, "%ld.%03d",
2127  secs * 1000 + msecs, usecs % 1000);
2128  if (exceeded && !was_logged)
2129  return 2;
2130  else
2131  return 1;
2132  }
2133  }
2134 
2135  return 0;
2136 }
2137 
2138 /*
2139  * errdetail_execute
2140  *
2141  * Add an errdetail() line showing the query referenced by an EXECUTE, if any.
2142  * The argument is the raw parsetree list.
2143  */
2144 static int
2145 errdetail_execute(List *raw_parsetree_list)
2146 {
2147  ListCell *parsetree_item;
2148 
2149  foreach(parsetree_item, raw_parsetree_list)
2150  {
2151  RawStmt *parsetree = lfirst_node(RawStmt, parsetree_item);
2152 
2153  if (IsA(parsetree->stmt, ExecuteStmt))
2154  {
2155  ExecuteStmt *stmt = (ExecuteStmt *) parsetree->stmt;
2156  PreparedStatement *pstmt;
2157 
2158  pstmt = FetchPreparedStatement(stmt->name, false);
2159  if (pstmt)
2160  {
2161  errdetail("prepare: %s", pstmt->plansource->query_string);
2162  return 0;
2163  }
2164  }
2165  }
2166 
2167  return 0;
2168 }
2169 
2170 /*
2171  * errdetail_params
2172  *
2173  * Add an errdetail() line showing bind-parameter data, if available.
2174  */
2175 static int
2177 {
2178  /* We mustn't call user-defined I/O functions when in an aborted xact */
2179  if (params && params->numParams > 0 && !IsAbortedTransactionBlockState())
2180  {
2181  StringInfoData param_str;
2182  MemoryContext oldcontext;
2183  int paramno;
2184 
2185  /* Make sure any trash is generated in MessageContext */
2186  oldcontext = MemoryContextSwitchTo(MessageContext);
2187 
2188  initStringInfo(&param_str);
2189 
2190  for (paramno = 0; paramno < params->numParams; paramno++)
2191  {
2192  ParamExternData *prm = &params->params[paramno];
2193  Oid typoutput;
2194  bool typisvarlena;
2195  char *pstring;
2196  char *p;
2197 
2198  appendStringInfo(&param_str, "%s$%d = ",
2199  paramno > 0 ? ", " : "",
2200  paramno + 1);
2201 
2202  if (prm->isnull || !OidIsValid(prm->ptype))
2203  {
2204  appendStringInfoString(&param_str, "NULL");
2205  continue;
2206  }
2207 
2208  getTypeOutputInfo(prm->ptype, &typoutput, &typisvarlena);
2209 
2210  pstring = OidOutputFunctionCall(typoutput, prm->value);
2211 
2212  appendStringInfoCharMacro(&param_str, '\'');
2213  for (p = pstring; *p; p++)
2214  {
2215  if (*p == '\'') /* double single quotes */
2216  appendStringInfoCharMacro(&param_str, *p);
2217  appendStringInfoCharMacro(&param_str, *p);
2218  }
2219  appendStringInfoCharMacro(&param_str, '\'');
2220 
2221  pfree(pstring);
2222  }
2223 
2224  errdetail("parameters: %s", param_str.data);
2225 
2226  pfree(param_str.data);
2227 
2228  MemoryContextSwitchTo(oldcontext);
2229  }
2230 
2231  return 0;
2232 }
2233 
2234 /*
2235  * errdetail_abort
2236  *
2237  * Add an errdetail() line showing abort reason, if any.
2238  */
2239 static int
2241 {
2243  errdetail("abort reason: recovery conflict");
2244 
2245  return 0;
2246 }
2247 
2248 /*
2249  * errdetail_recovery_conflict
2250  *
2251  * Add an errdetail() line showing conflict source.
2252  */
2253 static int
2255 {
2256  switch (RecoveryConflictReason)
2257  {
2259  errdetail("User was holding shared buffer pin for too long.");
2260  break;
2262  errdetail("User was holding a relation lock for too long.");
2263  break;
2265  errdetail("User was or might have been using tablespace that must be dropped.");
2266  break;
2268  errdetail("User query might have needed to see row versions that must be removed.");
2269  break;
2271  errdetail("User transaction caused buffer deadlock with recovery.");
2272  break;
2274  errdetail("User was connected to a database that must be dropped.");
2275  break;
2276  default:
2277  break;
2278  /* no errdetail */
2279  }
2280 
2281  return 0;
2282 }
2283 
2284 /*
2285  * exec_describe_statement_message
2286  *
2287  * Process a "Describe" message for a prepared statement
2288  */
2289 static void
2290 exec_describe_statement_message(const char *stmt_name)
2291 {
2292  CachedPlanSource *psrc;
2294  int i;
2295 
2296  /*
2297  * Start up a transaction command. (Note that this will normally change
2298  * current memory context.) Nothing happens if we are already in one.
2299  */
2301 
2302  /* Switch back to message context */
2304 
2305  /* Find prepared statement */
2306  if (stmt_name[0] != '\0')
2307  {
2308  PreparedStatement *pstmt;
2309 
2310  pstmt = FetchPreparedStatement(stmt_name, true);
2311  psrc = pstmt->plansource;
2312  }
2313  else
2314  {
2315  /* special-case the unnamed statement */
2316  psrc = unnamed_stmt_psrc;
2317  if (!psrc)
2318  ereport(ERROR,
2319  (errcode(ERRCODE_UNDEFINED_PSTATEMENT),
2320  errmsg("unnamed prepared statement does not exist")));
2321  }
2322 
2323  /* Prepared statements shouldn't have changeable result descs */
2324  Assert(psrc->fixed_result);
2325 
2326  /*
2327  * If we are in aborted transaction state, we can't run
2328  * SendRowDescriptionMessage(), because that needs catalog accesses.
2329  * Hence, refuse to Describe statements that return data. (We shouldn't
2330  * just refuse all Describes, since that might break the ability of some
2331  * clients to issue COMMIT or ROLLBACK commands, if they use code that
2332  * blindly Describes whatever it does.) We can Describe parameters
2333  * without doing anything dangerous, so we don't restrict that.
2334  */
2336  psrc->resultDesc)
2337  ereport(ERROR,
2338  (errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
2339  errmsg("current transaction is aborted, "
2340  "commands ignored until end of transaction block"),
2341  errdetail_abort()));
2342 
2344  return; /* can't actually do anything... */
2345 
2346  /*
2347  * First describe the parameters...
2348  */
2349  pq_beginmessage(&buf, 't'); /* parameter description message type */
2350  pq_sendint(&buf, psrc->num_params, 2);
2351 
2352  for (i = 0; i < psrc->num_params; i++)
2353  {
2354  Oid ptype = psrc->param_types[i];
2355 
2356  pq_sendint(&buf, (int) ptype, 4);
2357  }
2358  pq_endmessage(&buf);
2359 
2360  /*
2361  * Next send RowDescription or NoData to describe the result...
2362  */
2363  if (psrc->resultDesc)
2364  {
2365  List *tlist;
2366 
2367  /* Get the plan's primary targetlist */
2368  tlist = CachedPlanGetTargetList(psrc, NULL);
2369 
2370  SendRowDescriptionMessage(psrc->resultDesc, tlist, NULL);
2371  }
2372  else
2373  pq_putemptymessage('n'); /* NoData */
2374 
2375 }
2376 
2377 /*
2378  * exec_describe_portal_message
2379  *
2380  * Process a "Describe" message for a portal
2381  */
2382 static void
2383 exec_describe_portal_message(const char *portal_name)
2384 {
2385  Portal portal;
2386 
2387  /*
2388  * Start up a transaction command. (Note that this will normally change
2389  * current memory context.) Nothing happens if we are already in one.
2390  */
2392 
2393  /* Switch back to message context */
2395 
2396  portal = GetPortalByName(portal_name);
2397  if (!PortalIsValid(portal))
2398  ereport(ERROR,
2399  (errcode(ERRCODE_UNDEFINED_CURSOR),
2400  errmsg("portal \"%s\" does not exist", portal_name)));
2401 
2402  /*
2403  * If we are in aborted transaction state, we can't run
2404  * SendRowDescriptionMessage(), because that needs catalog accesses.
2405  * Hence, refuse to Describe portals that return data. (We shouldn't just
2406  * refuse all Describes, since that might break the ability of some
2407  * clients to issue COMMIT or ROLLBACK commands, if they use code that
2408  * blindly Describes whatever it does.)
2409  */
2411  portal->tupDesc)
2412  ereport(ERROR,
2413  (errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
2414  errmsg("current transaction is aborted, "
2415  "commands ignored until end of transaction block"),
2416  errdetail_abort()));
2417 
2419  return; /* can't actually do anything... */
2420 
2421  if (portal->tupDesc)
2423  FetchPortalTargetList(portal),
2424  portal->formats);
2425  else
2426  pq_putemptymessage('n'); /* NoData */
2427 }
2428 
2429 
2430 /*
2431  * Convenience routines for starting/committing a single command.
2432  */
2433 static void
2435 {
2436  if (!xact_started)
2437  {
2439 
2440  /* Set statement timeout running, if any */
2441  /* NB: this mustn't be enabled until we are within an xact */
2442  if (StatementTimeout > 0)
2444  else
2446 
2447  xact_started = true;
2448  }
2449 }
2450 
2451 static void
2453 {
2454  if (xact_started)
2455  {
2456  /* Cancel any active statement timeout before committing */
2458 
2460 
2461 #ifdef MEMORY_CONTEXT_CHECKING
2462  /* Check all memory contexts that weren't freed during commit */
2463  /* (those that were, were checked before being deleted) */
2464  MemoryContextCheck(TopMemoryContext);
2465 #endif
2466 
2467 #ifdef SHOW_MEMORY_STATS
2468  /* Print mem stats after each commit for leak tracking */
2470 #endif
2471 
2472  xact_started = false;
2473  }
2474 }
2475 
2476 
2477 /*
2478  * Convenience routines for checking whether a statement is one of the
2479  * ones that we allow in transaction-aborted state.
2480  */
2481 
2482 /* Test a bare parsetree */
2483 static bool
2485 {
2486  if (parsetree && IsA(parsetree, TransactionStmt))
2487  {
2488  TransactionStmt *stmt = (TransactionStmt *) parsetree;
2489 
2490  if (stmt->kind == TRANS_STMT_COMMIT ||
2491  stmt->kind == TRANS_STMT_PREPARE ||
2492  stmt->kind == TRANS_STMT_ROLLBACK ||
2493  stmt->kind == TRANS_STMT_ROLLBACK_TO)
2494  return true;
2495  }
2496  return false;
2497 }
2498 
2499 /* Test a list that contains PlannedStmt nodes */
2500 static bool
2502 {
2503  if (list_length(pstmts) == 1)
2504  {
2505  PlannedStmt *pstmt = linitial_node(PlannedStmt, pstmts);
2506 
2507  if (pstmt->commandType == CMD_UTILITY &&
2509  return true;
2510  }
2511  return false;
2512 }
2513 
2514 /* Test a list that contains PlannedStmt nodes */
2515 static bool
2517 {
2518  if (list_length(pstmts) == 1)
2519  {
2520  PlannedStmt *pstmt = linitial_node(PlannedStmt, pstmts);
2521 
2522  if (pstmt->commandType == CMD_UTILITY &&
2523  IsA(pstmt->utilityStmt, TransactionStmt))
2524  return true;
2525  }
2526  return false;
2527 }
2528 
2529 /* Release any existing unnamed prepared statement */
2530 static void
2532 {
2533  /* paranoia to avoid a dangling pointer in case of error */
2534  if (unnamed_stmt_psrc)
2535  {
2537 
2538  unnamed_stmt_psrc = NULL;
2539  DropCachedPlan(psrc);
2540  }
2541 }
2542 
2543 
2544 /* --------------------------------
2545  * signal handler routines used in PostgresMain()
2546  * --------------------------------
2547  */
2548 
2549 /*
2550  * quickdie() occurs when signalled SIGQUIT by the postmaster.
2551  *
2552  * Some backend has bought the farm,
2553  * so we need to stop what we're doing and exit.
2554  */
2555 void
2557 {
2558  sigaddset(&BlockSig, SIGQUIT); /* prevent nested calls */
2559  PG_SETMASK(&BlockSig);
2560 
2561  /*
2562  * Prevent interrupts while exiting; though we just blocked signals that
2563  * would queue new interrupts, one may have been pending. We don't want a
2564  * quickdie() downgraded to a mere query cancel.
2565  */
2566  HOLD_INTERRUPTS();
2567 
2568  /*
2569  * If we're aborting out of client auth, don't risk trying to send
2570  * anything to the client; we will likely violate the protocol, not to
2571  * mention that we may have interrupted the guts of OpenSSL or some
2572  * authentication library.
2573  */
2576 
2577  /*
2578  * Ideally this should be ereport(FATAL), but then we'd not get control
2579  * back...
2580  */
2581  ereport(WARNING,
2582  (errcode(ERRCODE_CRASH_SHUTDOWN),
2583  errmsg("terminating connection because of crash of another server process"),
2584  errdetail("The postmaster has commanded this server process to roll back"
2585  " the current transaction and exit, because another"
2586  " server process exited abnormally and possibly corrupted"
2587  " shared memory."),
2588  errhint("In a moment you should be able to reconnect to the"
2589  " database and repeat your command.")));
2590 
2591  /*
2592  * We DO NOT want to run proc_exit() callbacks -- we're here because
2593  * shared memory may be corrupted, so we don't want to try to clean up our
2594  * transaction. Just nail the windows shut and get out of town. Now that
2595  * there's an atexit callback to prevent third-party code from breaking
2596  * things by calling exit() directly, we have to reset the callbacks
2597  * explicitly to make this work as intended.
2598  */
2599  on_exit_reset();
2600 
2601  /*
2602  * Note we do exit(2) not exit(0). This is to force the postmaster into a
2603  * system reset cycle if some idiot DBA sends a manual SIGQUIT to a random
2604  * backend. This is necessary precisely because we don't clean up our
2605  * shared memory state. (The "dead man switch" mechanism in pmsignal.c
2606  * should ensure the postmaster sees this as a crash, too, but no harm in
2607  * being doubly sure.)
2608  */
2609  exit(2);
2610 }
2611 
2612 /*
2613  * Shutdown signal from postmaster: abort transaction and exit
2614  * at soonest convenient time
2615  */
2616 void
2618 {
2619  int save_errno = errno;
2620 
2621  /* Don't joggle the elbow of proc_exit */
2622  if (!proc_exit_inprogress)
2623  {
2624  InterruptPending = true;
2625  ProcDiePending = true;
2626  }
2627 
2628  /* If we're still here, waken anything waiting on the process latch */
2629  SetLatch(MyLatch);
2630 
2631  /*
2632  * If we're in single user mode, we want to quit immediately - we can't
2633  * rely on latches as they wouldn't work when stdin/stdout is a file.
2634  * Rather ugly, but it's unlikely to be worthwhile to invest much more
2635  * effort just for the benefit of single user mode.
2636  */
2639 
2640  errno = save_errno;
2641 }
2642 
2643 /*
2644  * Query-cancel signal from postmaster: abort current transaction
2645  * at soonest convenient time
2646  */
2647 void
2649 {
2650  int save_errno = errno;
2651 
2652  /*
2653  * Don't joggle the elbow of proc_exit
2654  */
2655  if (!proc_exit_inprogress)
2656  {
2657  InterruptPending = true;
2658  QueryCancelPending = true;
2659  }
2660 
2661  /* If we're still here, waken anything waiting on the process latch */
2662  SetLatch(MyLatch);
2663 
2664  errno = save_errno;
2665 }
2666 
2667 /* signal handler for floating point exception */
2668 void
2670 {
2671  /* We're not returning, so no need to save errno */
2672  ereport(ERROR,
2673  (errcode(ERRCODE_FLOATING_POINT_EXCEPTION),
2674  errmsg("floating-point exception"),
2675  errdetail("An invalid floating-point operation was signaled. "
2676  "This probably means an out-of-range result or an "
2677  "invalid operation, such as division by zero.")));
2678 }
2679 
2680 /*
2681  * SIGHUP: set flag to re-read config file at next convenient time.
2682  *
2683  * Sets the ConfigReloadPending flag, which should be checked at convenient
2684  * places inside main loops. (Better than doing the reading in the signal
2685  * handler, ey?)
2686  */
2687 void
2689 {
2690  int save_errno = errno;
2691 
2692  ConfigReloadPending = true;
2693  SetLatch(MyLatch);
2694 
2695  errno = save_errno;
2696 }
2697 
2698 /*
2699  * RecoveryConflictInterrupt: out-of-line portion of recovery conflict
2700  * handling following receipt of SIGUSR1. Designed to be similar to die()
2701  * and StatementCancelHandler(). Called only by a normal user backend
2702  * that begins a transaction during recovery.
2703  */
2704 void
2706 {
2707  int save_errno = errno;
2708 
2709  /*
2710  * Don't joggle the elbow of proc_exit
2711  */
2712  if (!proc_exit_inprogress)
2713  {
2714  RecoveryConflictReason = reason;
2715  switch (reason)
2716  {
2718 
2719  /*
2720  * If we aren't waiting for a lock we can never deadlock.
2721  */
2722  if (!IsWaitingForLock())
2723  return;
2724 
2725  /* Intentional drop through to check wait for pin */
2726 
2728 
2729  /*
2730  * If we aren't blocking the Startup process there is nothing
2731  * more to do.
2732  */
2734  return;
2735 
2737 
2738  /* Intentional drop through to error handling */
2739 
2743 
2744  /*
2745  * If we aren't in a transaction any longer then ignore.
2746  */
2748  return;
2749 
2750  /*
2751  * If we can abort just the current subtransaction then we are
2752  * OK to throw an ERROR to resolve the conflict. Otherwise
2753  * drop through to the FATAL case.
2754  *
2755  * XXX other times that we can throw just an ERROR *may* be
2756  * PROCSIG_RECOVERY_CONFLICT_LOCK if no locks are held in
2757  * parent transactions
2758  *
2759  * PROCSIG_RECOVERY_CONFLICT_SNAPSHOT if no snapshots are held
2760  * by parent transactions and the transaction is not
2761  * transaction-snapshot mode
2762  *
2763  * PROCSIG_RECOVERY_CONFLICT_TABLESPACE if no temp files or
2764  * cursors open in parent transactions
2765  */
2766  if (!IsSubTransaction())
2767  {
2768  /*
2769  * If we already aborted then we no longer need to cancel.
2770  * We do this here since we do not wish to ignore aborted
2771  * subtransactions, which must cause FATAL, currently.
2772  */
2774  return;
2775 
2776  RecoveryConflictPending = true;
2777  QueryCancelPending = true;
2778  InterruptPending = true;
2779  break;
2780  }
2781 
2782  /* Intentional drop through to session cancel */
2783 
2785  RecoveryConflictPending = true;
2786  ProcDiePending = true;
2787  InterruptPending = true;
2788  break;
2789 
2790  default:
2791  elog(FATAL, "unrecognized conflict mode: %d",
2792  (int) reason);
2793  }
2794 
2796 
2797  /*
2798  * All conflicts apart from database cause dynamic errors where the
2799  * command or transaction can be retried at a later point with some
2800  * potential for success. No need to reset this, since non-retryable
2801  * conflict errors are currently FATAL.
2802  */
2803  if (reason == PROCSIG_RECOVERY_CONFLICT_DATABASE)
2804  RecoveryConflictRetryable = false;
2805  }
2806 
2807  /*
2808  * Set the process latch. This function essentially emulates signal
2809  * handlers like die() and StatementCancelHandler() and it seems prudent
2810  * to behave similarly as they do.
2811  */
2812  SetLatch(MyLatch);
2813 
2814  errno = save_errno;
2815 }
2816 
2817 /*
2818  * ProcessInterrupts: out-of-line portion of CHECK_FOR_INTERRUPTS() macro
2819  *
2820  * If an interrupt condition is pending, and it's safe to service it,
2821  * then clear the flag and accept the interrupt. Called only when
2822  * InterruptPending is true.
2823  */
2824 void
2826 {
2827  /* OK to accept any interrupts now? */
2828  if (InterruptHoldoffCount != 0 || CritSectionCount != 0)
2829  return;
2830  InterruptPending = false;
2831 
2832  if (ProcDiePending)
2833  {
2834  ProcDiePending = false;
2835  QueryCancelPending = false; /* ProcDie trumps QueryCancel */
2836  LockErrorCleanup();
2837  /* As in quickdie, don't risk sending to client during auth */
2841  ereport(FATAL,
2842  (errcode(ERRCODE_QUERY_CANCELED),
2843  errmsg("canceling authentication due to timeout")));
2844  else if (IsAutoVacuumWorkerProcess())
2845  ereport(FATAL,
2846  (errcode(ERRCODE_ADMIN_SHUTDOWN),
2847  errmsg("terminating autovacuum process due to administrator command")));
2848  else if (IsLogicalWorker())
2849  ereport(FATAL,
2850  (errcode(ERRCODE_ADMIN_SHUTDOWN),
2851  errmsg("terminating logical replication worker due to administrator command")));
2852  else if (IsLogicalLauncher())
2853  {
2854  ereport(DEBUG1,
2855  (errmsg("logical replication launcher shutting down")));
2856 
2857  /*
2858  * The logical replication launcher can be stopped at any time.
2859  * Use exit status 1 so the background worker is restarted.
2860  */
2861  proc_exit(1);
2862  }
2864  {
2866  ereport(FATAL,
2867  (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
2868  errmsg("terminating connection due to conflict with recovery"),
2870  }
2871  else if (RecoveryConflictPending)
2872  {
2873  /* Currently there is only one non-retryable recovery conflict */
2876  ereport(FATAL,
2877  (errcode(ERRCODE_DATABASE_DROPPED),
2878  errmsg("terminating connection due to conflict with recovery"),
2880  }
2881  else
2882  ereport(FATAL,
2883  (errcode(ERRCODE_ADMIN_SHUTDOWN),
2884  errmsg("terminating connection due to administrator command")));
2885  }
2887  {
2888  QueryCancelPending = false; /* lost connection trumps QueryCancel */
2889  LockErrorCleanup();
2890  /* don't send to client, we already know the connection to be dead. */
2892  ereport(FATAL,
2893  (errcode(ERRCODE_CONNECTION_FAILURE),
2894  errmsg("connection to client lost")));
2895  }
2896 
2897  /*
2898  * If a recovery conflict happens while we are waiting for input from the
2899  * client, the client is presumably just sitting idle in a transaction,
2900  * preventing recovery from making progress. Terminate the connection to
2901  * dislodge it.
2902  */
2904  {
2905  QueryCancelPending = false; /* this trumps QueryCancel */
2906  RecoveryConflictPending = false;
2907  LockErrorCleanup();
2909  ereport(FATAL,
2910  (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
2911  errmsg("terminating connection due to conflict with recovery"),
2913  errhint("In a moment you should be able to reconnect to the"
2914  " database and repeat your command.")));
2915  }
2916 
2917  if (QueryCancelPending)
2918  {
2919  bool lock_timeout_occurred;
2920  bool stmt_timeout_occurred;
2921 
2922  /*
2923  * Don't allow query cancel interrupts while reading input from the
2924  * client, because we might lose sync in the FE/BE protocol. (Die
2925  * interrupts are OK, because we won't read any further messages from
2926  * the client in that case.)
2927  */
2928  if (QueryCancelHoldoffCount != 0)
2929  {
2930  /*
2931  * Re-arm InterruptPending so that we process the cancel request
2932  * as soon as we're done reading the message.
2933  */
2934  InterruptPending = true;
2935  return;
2936  }
2937 
2938  QueryCancelPending = false;
2939 
2940  /*
2941  * If LOCK_TIMEOUT and STATEMENT_TIMEOUT indicators are both set, we
2942  * need to clear both, so always fetch both.
2943  */
2944  lock_timeout_occurred = get_timeout_indicator(LOCK_TIMEOUT, true);
2945  stmt_timeout_occurred = get_timeout_indicator(STATEMENT_TIMEOUT, true);
2946 
2947  /*
2948  * If both were set, we want to report whichever timeout completed
2949  * earlier; this ensures consistent behavior if the machine is slow
2950  * enough that the second timeout triggers before we get here. A tie
2951  * is arbitrarily broken in favor of reporting a lock timeout.
2952  */
2953  if (lock_timeout_occurred && stmt_timeout_occurred &&
2955  lock_timeout_occurred = false; /* report stmt timeout */
2956 
2957  if (lock_timeout_occurred)
2958  {
2959  LockErrorCleanup();
2960  ereport(ERROR,
2961  (errcode(ERRCODE_LOCK_NOT_AVAILABLE),
2962  errmsg("canceling statement due to lock timeout")));
2963  }
2964  if (stmt_timeout_occurred)
2965  {
2966  LockErrorCleanup();
2967  ereport(ERROR,
2968  (errcode(ERRCODE_QUERY_CANCELED),
2969  errmsg("canceling statement due to statement timeout")));
2970  }
2972  {
2973  LockErrorCleanup();
2974  ereport(ERROR,
2975  (errcode(ERRCODE_QUERY_CANCELED),
2976  errmsg("canceling autovacuum task")));
2977  }
2979  {
2980  RecoveryConflictPending = false;
2981  LockErrorCleanup();
2983  ereport(ERROR,
2984  (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
2985  errmsg("canceling statement due to conflict with recovery"),
2987  }
2988 
2989  /*
2990  * If we are reading a command from the client, just ignore the cancel
2991  * request --- sending an extra error message won't accomplish
2992  * anything. Otherwise, go ahead and throw the error.
2993  */
2994  if (!DoingCommandRead)
2995  {
2996  LockErrorCleanup();
2997  ereport(ERROR,
2998  (errcode(ERRCODE_QUERY_CANCELED),
2999  errmsg("canceling statement due to user request")));
3000  }
3001  }
3002 
3004  {
3005  /* Has the timeout setting changed since last we looked? */
3007  ereport(FATAL,
3008  (errcode(ERRCODE_IDLE_IN_TRANSACTION_SESSION_TIMEOUT),
3009  errmsg("terminating connection due to idle-in-transaction timeout")));
3010  else
3012 
3013  }
3014 
3017 }
3018 
3019 
3020 /*
3021  * IA64-specific code to fetch the AR.BSP register for stack depth checks.
3022  *
3023  * We currently support gcc, icc, and HP-UX's native compiler here.
3024  *
3025  * Note: while icc accepts gcc asm blocks on x86[_64], this is not true on
3026  * ia64 (at least not in icc versions before 12.x). So we have to carry a
3027  * separate implementation for it.
3028  */
3029 #if defined(__ia64__) || defined(__ia64)
3030 
3031 #if defined(__hpux) && !defined(__GNUC__) && !defined(__INTEL_COMPILER)
3032 /* Assume it's HP-UX native compiler */
3033 #include <ia64/sys/inline.h>
3034 #define ia64_get_bsp() ((char *) (_Asm_mov_from_ar(_AREG_BSP, _NO_FENCE)))
3035 #elif defined(__INTEL_COMPILER)
3036 /* icc */
3037 #include <asm/ia64regs.h>
3038 #define ia64_get_bsp() ((char *) __getReg(_IA64_REG_AR_BSP))
3039 #else
3040 /* gcc */
3041 static __inline__ char *
3042 ia64_get_bsp(void)
3043 {
3044  char *ret;
3045 
3046  /* the ;; is a "stop", seems to be required before fetching BSP */
3047  __asm__ __volatile__(
3048  ";;\n"
3049  " mov %0=ar.bsp \n"
3050 : "=r"(ret));
3051 
3052  return ret;
3053 }
3054 #endif
3055 #endif /* IA64 */
3056 
3057 
3058 /*
3059  * set_stack_base: set up reference point for stack depth checking
3060  *
3061  * Returns the old reference point, if any.
3062  */
3065 {
3066  char stack_base;
3067  pg_stack_base_t old;
3068 
3069 #if defined(__ia64__) || defined(__ia64)
3070  old.stack_base_ptr = stack_base_ptr;
3071  old.register_stack_base_ptr = register_stack_base_ptr;
3072 #else
3073  old = stack_base_ptr;
3074 #endif
3075 
3076  /* Set up reference point for stack depth checking */
3077  stack_base_ptr = &stack_base;
3078 #if defined(__ia64__) || defined(__ia64)
3079  register_stack_base_ptr = ia64_get_bsp();
3080 #endif
3081 
3082  return old;
3083 }
3084 
3085 /*
3086  * restore_stack_base: restore reference point for stack depth checking
3087  *
3088  * This can be used after set_stack_base() to restore the old value. This
3089  * is currently only used in PL/Java. When PL/Java calls a backend function
3090  * from different thread, the thread's stack is at a different location than
3091  * the main thread's stack, so it sets the base pointer before the call, and
3092  * restores it afterwards.
3093  */
3094 void
3096 {
3097 #if defined(__ia64__) || defined(__ia64)
3098  stack_base_ptr = base.stack_base_ptr;
3099  register_stack_base_ptr = base.register_stack_base_ptr;
3100 #else
3101  stack_base_ptr = base;
3102 #endif
3103 }
3104 
3105 /*
3106  * check_stack_depth/stack_is_too_deep: check for excessively deep recursion
3107  *
3108  * This should be called someplace in any recursive routine that might possibly
3109  * recurse deep enough to overflow the stack. Most Unixen treat stack
3110  * overflow as an unrecoverable SIGSEGV, so we want to error out ourselves
3111  * before hitting the hardware limit.
3112  *
3113  * check_stack_depth() just throws an error summarily. stack_is_too_deep()
3114  * can be used by code that wants to handle the error condition itself.
3115  */
3116 void
3118 {
3119  if (stack_is_too_deep())
3120  {
3121  ereport(ERROR,
3122  (errcode(ERRCODE_STATEMENT_TOO_COMPLEX),
3123  errmsg("stack depth limit exceeded"),
3124  errhint("Increase the configuration parameter \"max_stack_depth\" (currently %dkB), "
3125  "after ensuring the platform's stack depth limit is adequate.",
3126  max_stack_depth)));
3127  }
3128 }
3129 
3130 bool
3132 {
3133  char stack_top_loc;
3134  long stack_depth;
3135 
3136  /*
3137  * Compute distance from reference point to my local variables
3138  */
3139  stack_depth = (long) (stack_base_ptr - &stack_top_loc);
3140 
3141  /*
3142  * Take abs value, since stacks grow up on some machines, down on others
3143  */
3144  if (stack_depth < 0)
3145  stack_depth = -stack_depth;
3146 
3147  /*
3148  * Trouble?
3149  *
3150  * The test on stack_base_ptr prevents us from erroring out if called
3151  * during process setup or in a non-backend process. Logically it should
3152  * be done first, but putting it here avoids wasting cycles during normal
3153  * cases.
3154  */
3155  if (stack_depth > max_stack_depth_bytes &&
3156  stack_base_ptr != NULL)
3157  return true;
3158 
3159  /*
3160  * On IA64 there is a separate "register" stack that requires its own
3161  * independent check. For this, we have to measure the change in the
3162  * "BSP" pointer from PostgresMain to here. Logic is just as above,
3163  * except that we know IA64's register stack grows up.
3164  *
3165  * Note we assume that the same max_stack_depth applies to both stacks.
3166  */
3167 #if defined(__ia64__) || defined(__ia64)
3168  stack_depth = (long) (ia64_get_bsp() - register_stack_base_ptr);
3169 
3170  if (stack_depth > max_stack_depth_bytes &&
3171  register_stack_base_ptr != NULL)
3172  return true;
3173 #endif /* IA64 */
3174 
3175  return false;
3176 }
3177 
3178 /* GUC check hook for max_stack_depth */
3179 bool
3180 check_max_stack_depth(int *newval, void **extra, GucSource source)
3181 {
3182  long newval_bytes = *newval * 1024L;
3183  long stack_rlimit = get_stack_depth_rlimit();
3184 
3185  if (stack_rlimit > 0 && newval_bytes > stack_rlimit - STACK_DEPTH_SLOP)
3186  {
3187  GUC_check_errdetail("\"max_stack_depth\" must not exceed %ldkB.",
3188  (stack_rlimit - STACK_DEPTH_SLOP) / 1024L);
3189  GUC_check_errhint("Increase the platform's stack depth limit via \"ulimit -s\" or local equivalent.");
3190  return false;
3191  }
3192  return true;
3193 }
3194 
3195 /* GUC assign hook for max_stack_depth */
3196 void
3198 {
3199  long newval_bytes = newval * 1024L;
3200 
3201  max_stack_depth_bytes = newval_bytes;
3202 }
3203 
3204 
3205 /*
3206  * set_debug_options --- apply "-d N" command line option
3207  *
3208  * -d is not quite the same as setting log_min_messages because it enables
3209  * other output options.
3210  */
3211 void
3212 set_debug_options(int debug_flag, GucContext context, GucSource source)
3213 {
3214  if (debug_flag > 0)
3215  {
3216  char debugstr[64];
3217 
3218  sprintf(debugstr, "debug%d", debug_flag);
3219  SetConfigOption("log_min_messages", debugstr, context, source);
3220  }
3221  else
3222  SetConfigOption("log_min_messages", "notice", context, source);
3223 
3224  if (debug_flag >= 1 && context == PGC_POSTMASTER)
3225  {
3226  SetConfigOption("log_connections", "true", context, source);
3227  SetConfigOption("log_disconnections", "true", context, source);
3228  }
3229  if (debug_flag >= 2)
3230  SetConfigOption("log_statement", "all", context, source);
3231  if (debug_flag >= 3)
3232  SetConfigOption("debug_print_parse", "true", context, source);
3233  if (debug_flag >= 4)
3234  SetConfigOption("debug_print_plan", "true", context, source);
3235  if (debug_flag >= 5)
3236  SetConfigOption("debug_print_rewritten", "true", context, source);
3237 }
3238 
3239 
3240 bool
3242 {
3243  const char *tmp = NULL;
3244 
3245  switch (arg[0])
3246  {
3247  case 's': /* seqscan */
3248  tmp = "enable_seqscan";
3249  break;
3250  case 'i': /* indexscan */
3251  tmp = "enable_indexscan";
3252  break;
3253  case 'o': /* indexonlyscan */
3254  tmp = "enable_indexonlyscan";
3255  break;
3256  case 'b': /* bitmapscan */
3257  tmp = "enable_bitmapscan";
3258  break;
3259  case 't': /* tidscan */
3260  tmp = "enable_tidscan";
3261  break;
3262  case 'n': /* nestloop */
3263  tmp = "enable_nestloop";
3264  break;
3265  case 'm': /* mergejoin */
3266  tmp = "enable_mergejoin";
3267  break;
3268  case 'h': /* hashjoin */
3269  tmp = "enable_hashjoin";
3270  break;
3271  }
3272  if (tmp)
3273  {
3274  SetConfigOption(tmp, "false", context, source);
3275  return true;
3276  }
3277  else
3278  return false;
3279 }
3280 
3281 
3282 const char *
3284 {
3285  switch (arg[0])
3286  {
3287  case 'p':
3288  if (optarg[1] == 'a') /* "parser" */
3289  return "log_parser_stats";
3290  else if (optarg[1] == 'l') /* "planner" */
3291  return "log_planner_stats";
3292  break;
3293 
3294  case 'e': /* "executor" */
3295  return "log_executor_stats";
3296  break;
3297  }
3298 
3299  return NULL;
3300 }
3301 
3302 
3303 /* ----------------------------------------------------------------
3304  * process_postgres_switches
3305  * Parse command line arguments for PostgresMain
3306  *
3307  * This is called twice, once for the "secure" options coming from the
3308  * postmaster or command line, and once for the "insecure" options coming
3309  * from the client's startup packet. The latter have the same syntax but
3310  * may be restricted in what they can do.
3311  *
3312  * argv[0] is ignored in either case (it's assumed to be the program name).
3313  *
3314  * ctx is PGC_POSTMASTER for secure options, PGC_BACKEND for insecure options
3315  * coming from the client, or PGC_SU_BACKEND for insecure options coming from
3316  * a superuser client.
3317  *
3318  * If a database name is present in the command line arguments, it's
3319  * returned into *dbname (this is allowed only if *dbname is initially NULL).
3320  * ----------------------------------------------------------------
3321  */
3322 void
3323 process_postgres_switches(int argc, char *argv[], GucContext ctx,
3324  const char **dbname)
3325 {
3326  bool secure = (ctx == PGC_POSTMASTER);
3327  int errs = 0;
3328  GucSource gucsource;
3329  int flag;
3330 
3331  if (secure)
3332  {
3333  gucsource = PGC_S_ARGV; /* switches came from command line */
3334 
3335  /* Ignore the initial --single argument, if present */
3336  if (argc > 1 && strcmp(argv[1], "--single") == 0)
3337  {
3338  argv++;
3339  argc--;
3340  }
3341  }
3342  else
3343  {
3344  gucsource = PGC_S_CLIENT; /* switches came from client */
3345  }
3346 
3347 #ifdef HAVE_INT_OPTERR
3348 
3349  /*
3350  * Turn this off because it's either printed to stderr and not the log
3351  * where we'd want it, or argv[0] is now "--single", which would make for
3352  * a weird error message. We print our own error message below.
3353  */
3354  opterr = 0;
3355 #endif
3356 
3357  /*
3358  * Parse command-line options. CAUTION: keep this in sync with
3359  * postmaster/postmaster.c (the option sets should not conflict) and with
3360  * the common help() function in main/main.c.
3361  */
3362  while ((flag = getopt(argc, argv, "B:bc:C:D:d:EeFf:h:ijk:lN:nOo:Pp:r:S:sTt:v:W:-:")) != -1)
3363  {
3364  switch (flag)
3365  {
3366  case 'B':
3367  SetConfigOption("shared_buffers", optarg, ctx, gucsource);
3368  break;
3369 
3370  case 'b':
3371  /* Undocumented flag used for binary upgrades */
3372  if (secure)
3373  IsBinaryUpgrade = true;
3374  break;
3375 
3376  case 'C':
3377  /* ignored for consistency with the postmaster */
3378  break;
3379 
3380  case 'D':
3381  if (secure)
3382  userDoption = strdup(optarg);
3383  break;
3384 
3385  case 'd':
3386  set_debug_options(atoi(optarg), ctx, gucsource);
3387  break;
3388 
3389  case 'E':
3390  if (secure)
3391  EchoQuery = true;
3392  break;
3393 
3394  case 'e':
3395  SetConfigOption("datestyle", "euro", ctx, gucsource);
3396  break;
3397 
3398  case 'F':
3399  SetConfigOption("fsync", "false", ctx, gucsource);
3400  break;
3401 
3402  case 'f':
3403  if (!set_plan_disabling_options(optarg, ctx, gucsource))
3404  errs++;
3405  break;
3406 
3407  case 'h':
3408  SetConfigOption("listen_addresses", optarg, ctx, gucsource);
3409  break;
3410 
3411  case 'i':
3412  SetConfigOption("listen_addresses", "*", ctx, gucsource);
3413  break;
3414 
3415  case 'j':
3416  if (secure)
3417  UseSemiNewlineNewline = true;
3418  break;
3419 
3420  case 'k':
3421  SetConfigOption("unix_socket_directories", optarg, ctx, gucsource);
3422  break;
3423 
3424  case 'l':
3425  SetConfigOption("ssl", "true", ctx, gucsource);
3426  break;
3427 
3428  case 'N':
3429  SetConfigOption("max_connections", optarg, ctx, gucsource);
3430  break;
3431 
3432  case 'n':
3433  /* ignored for consistency with postmaster */
3434  break;
3435 
3436  case 'O':
3437  SetConfigOption("allow_system_table_mods", "true", ctx, gucsource);
3438  break;
3439 
3440  case 'o':
3441  errs++;
3442  break;
3443 
3444  case 'P':
3445  SetConfigOption("ignore_system_indexes", "true", ctx, gucsource);
3446  break;
3447 
3448  case 'p':
3449  SetConfigOption("port", optarg, ctx, gucsource);
3450  break;
3451 
3452  case 'r':
3453  /* send output (stdout and stderr) to the given file */
3454  if (secure)
3456  break;
3457 
3458  case 'S':
3459  SetConfigOption("work_mem", optarg, ctx, gucsource);
3460  break;
3461 
3462  case 's':
3463  SetConfigOption("log_statement_stats", "true", ctx, gucsource);
3464  break;
3465 
3466  case 'T':
3467  /* ignored for consistency with the postmaster */
3468  break;
3469 
3470  case 't':
3471  {
3472  const char *tmp = get_stats_option_name(optarg);
3473 
3474  if (tmp)
3475  SetConfigOption(tmp, "true", ctx, gucsource);
3476  else
3477  errs++;
3478  break;
3479  }
3480 
3481  case 'v':
3482 
3483  /*
3484  * -v is no longer used in normal operation, since
3485  * FrontendProtocol is already set before we get here. We keep
3486  * the switch only for possible use in standalone operation,
3487  * in case we ever support using normal FE/BE protocol with a
3488  * standalone backend.
3489  */
3490  if (secure)
3492  break;
3493 
3494  case 'W':
3495  SetConfigOption("post_auth_delay", optarg, ctx, gucsource);
3496  break;
3497 
3498  case 'c':
3499  case '-':
3500  {
3501  char *name,
3502  *value;
3503 
3504  ParseLongOption(optarg, &name, &value);
3505  if (!value)
3506  {
3507  if (flag == '-')
3508  ereport(ERROR,
3509  (errcode(ERRCODE_SYNTAX_ERROR),
3510  errmsg("--%s requires a value",
3511  optarg)));
3512  else
3513  ereport(ERROR,
3514  (errcode(ERRCODE_SYNTAX_ERROR),
3515  errmsg("-c %s requires a value",
3516  optarg)));
3517  }
3518  SetConfigOption(name, value, ctx, gucsource);
3519  free(name);
3520  if (value)
3521  free(value);
3522  break;
3523  }
3524 
3525  default:
3526  errs++;
3527  break;
3528  }
3529 
3530  if (errs)
3531  break;
3532  }
3533 
3534  /*
3535  * Optional database name should be there only if *dbname is NULL.
3536  */
3537  if (!errs && dbname && *dbname == NULL && argc - optind >= 1)
3538  *dbname = strdup(argv[optind++]);
3539 
3540  if (errs || argc != optind)
3541  {
3542  if (errs)
3543  optind--; /* complain about the previous argument */
3544 
3545  /* spell the error message a bit differently depending on context */
3546  if (IsUnderPostmaster)
3547  ereport(FATAL,
3548  (errcode(ERRCODE_SYNTAX_ERROR),
3549  errmsg("invalid command-line argument for server process: %s", argv[optind]),
3550  errhint("Try \"%s --help\" for more information.", progname)));
3551  else
3552  ereport(FATAL,
3553  (errcode(ERRCODE_SYNTAX_ERROR),
3554  errmsg("%s: invalid command-line argument: %s",
3555  progname, argv[optind]),
3556  errhint("Try \"%s --help\" for more information.", progname)));
3557  }
3558 
3559  /*
3560  * Reset getopt(3) library so that it will work correctly in subprocesses
3561  * or when this function is called a second time with another array.
3562  */
3563  optind = 1;
3564 #ifdef HAVE_INT_OPTRESET
3565  optreset = 1; /* some systems need this too */
3566 #endif
3567 }
3568 
3569 
3570 /* ----------------------------------------------------------------
3571  * PostgresMain
3572  * postgres main loop -- all backends, interactive or otherwise start here
3573  *
3574  * argc/argv are the command line arguments to be used. (When being forked
3575  * by the postmaster, these are not the original argv array of the process.)
3576  * dbname is the name of the database to connect to, or NULL if the database
3577  * name should be extracted from the command line arguments or defaulted.
3578  * username is the PostgreSQL user name to be used for the session.
3579  * ----------------------------------------------------------------
3580  */
3581 void
3582 PostgresMain(int argc, char *argv[],
3583  const char *dbname,
3584  const char *username)
3585 {
3586  int firstchar;
3587  StringInfoData input_message;
3588  sigjmp_buf local_sigjmp_buf;
3589  volatile bool send_ready_for_query = true;
3590  bool disable_idle_in_transaction_timeout = false;
3591 
3592  /* Initialize startup process environment if necessary. */
3593  if (!IsUnderPostmaster)
3594  InitStandaloneProcess(argv[0]);
3595 
3597 
3598  /*
3599  * Set default values for command-line options.
3600  */
3601  if (!IsUnderPostmaster)
3603 
3604  /*
3605  * Parse command-line options.
3606  */
3607  process_postgres_switches(argc, argv, PGC_POSTMASTER, &dbname);
3608 
3609  /* Must have gotten a database name, or have a default (the username) */
3610  if (dbname == NULL)
3611  {
3612  dbname = username;
3613  if (dbname == NULL)
3614  ereport(FATAL,
3615  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3616  errmsg("%s: no database nor user name specified",
3617  progname)));
3618  }
3619 
3620  /* Acquire configuration parameters, unless inherited from postmaster */
3621  if (!IsUnderPostmaster)
3622  {
3624  proc_exit(1);
3625  }
3626 
3627  /*
3628  * Set up signal handlers and masks.
3629  *
3630  * Note that postmaster blocked all signals before forking child process,
3631  * so there is no race condition whereby we might receive a signal before
3632  * we have set up the handler.
3633  *
3634  * Also note: it's best not to use any signals that are SIG_IGNored in the
3635  * postmaster. If such a signal arrives before we are able to change the
3636  * handler to non-SIG_IGN, it'll get dropped. Instead, make a dummy
3637  * handler in the postmaster to reserve the signal. (Of course, this isn't
3638  * an issue for signals that are locally generated, such as SIGALRM and
3639  * SIGPIPE.)
3640  */
3641  if (am_walsender)
3642  WalSndSignals();
3643  else
3644  {
3645  pqsignal(SIGHUP, PostgresSigHupHandler); /* set flag to read config
3646  * file */
3647  pqsignal(SIGINT, StatementCancelHandler); /* cancel current query */
3648  pqsignal(SIGTERM, die); /* cancel current query and exit */
3649 
3650  /*
3651  * In a standalone backend, SIGQUIT can be generated from the keyboard
3652  * easily, while SIGTERM cannot, so we make both signals do die()
3653  * rather than quickdie().
3654  */
3655  if (IsUnderPostmaster)
3656  pqsignal(SIGQUIT, quickdie); /* hard crash time */
3657  else
3658  pqsignal(SIGQUIT, die); /* cancel current query and exit */
3659  InitializeTimeouts(); /* establishes SIGALRM handler */
3660 
3661  /*
3662  * Ignore failure to write to frontend. Note: if frontend closes
3663  * connection, we will notice it and exit cleanly when control next
3664  * returns to outer loop. This seems safer than forcing exit in the
3665  * midst of output during who-knows-what operation...
3666  */
3671 
3672  /*
3673  * Reset some signals that are accepted by postmaster but not by
3674  * backend
3675  */
3676  pqsignal(SIGCHLD, SIG_DFL); /* system() requires this on some
3677  * platforms */
3678  }
3679 
3680  pqinitmask();
3681 
3682  if (IsUnderPostmaster)
3683  {
3684  /* We allow SIGQUIT (quickdie) at all times */
3685  sigdelset(&BlockSig, SIGQUIT);
3686  }
3687 
3688  PG_SETMASK(&BlockSig); /* block everything except SIGQUIT */
3689 
3690  if (!IsUnderPostmaster)
3691  {
3692  /*
3693  * Validate we have been given a reasonable-looking DataDir (if under
3694  * postmaster, assume postmaster did this already).
3695  */
3696  Assert(DataDir);
3698 
3699  /* Change into DataDir (if under postmaster, was done already) */
3700  ChangeToDataDir();
3701 
3702  /*
3703  * Create lockfile for data directory.
3704  */
3705  CreateDataDirLockFile(false);
3706 
3707  /* Initialize MaxBackends (if under postmaster, was done already) */
3709  }
3710 
3711  /* Early initialization */
3712  BaseInit();
3713 
3714  /*
3715  * Create a per-backend PGPROC struct in shared memory, except in the
3716  * EXEC_BACKEND case where this was done in SubPostmasterMain. We must do
3717  * this before we can use LWLocks (and in the EXEC_BACKEND case we already
3718  * had to do some stuff with LWLocks).
3719  */
3720 #ifdef EXEC_BACKEND
3721  if (!IsUnderPostmaster)
3722  InitProcess();
3723 #else
3724  InitProcess();
3725 #endif
3726 
3727  /* We need to allow SIGINT, etc during the initial transaction */
3729 
3730  /*
3731  * General initialization.
3732  *
3733  * NOTE: if you are tempted to add code in this vicinity, consider putting
3734  * it inside InitPostgres() instead. In particular, anything that
3735  * involves database access should be there, not here.
3736  */
3737  InitPostgres(dbname, InvalidOid, username, InvalidOid, NULL);
3738 
3739  /*
3740  * If the PostmasterContext is still around, recycle the space; we don't
3741  * need it anymore after InitPostgres completes. Note this does not trash
3742  * *MyProcPort, because ConnCreate() allocated that space with malloc()
3743  * ... else we'd need to copy the Port data first. Also, subsidiary data
3744  * such as the username isn't lost either; see ProcessStartupPacket().
3745  */
3746  if (PostmasterContext)
3747  {
3750  }
3751 
3753 
3754  /*
3755  * Now all GUC states are fully set up. Report them to client if
3756  * appropriate.
3757  */
3759 
3760  /*
3761  * Also set up handler to log session end; we have to wait till now to be
3762  * sure Log_disconnections has its final value.
3763  */
3766 
3767  /* Perform initialization specific to a WAL sender process. */
3768  if (am_walsender)
3769  InitWalSender();
3770 
3771  /*
3772  * process any libraries that should be preloaded at backend start (this
3773  * likewise can't be done until GUC settings are complete)
3774  */
3776 
3777  /*
3778  * Send this backend's cancellation info to the frontend.
3779  */
3781  {
3783 
3784  pq_beginmessage(&buf, 'K');
3785  pq_sendint(&buf, (int32) MyProcPid, sizeof(int32));
3786  pq_sendint(&buf, (int32) MyCancelKey, sizeof(int32));
3787  pq_endmessage(&buf);
3788  /* Need not flush since ReadyForQuery will do it. */
3789  }
3790 
3791  /* Welcome banner for standalone case */
3793  printf("\nPostgreSQL stand-alone backend %s\n", PG_VERSION);
3794 
3795  /*
3796  * Create the memory context we will use in the main loop.
3797  *
3798  * MessageContext is reset once per iteration of the main loop, ie, upon
3799  * completion of processing of each command message from the client.
3800  */
3802  "MessageContext",
3804 
3805  /*
3806  * Remember stand-alone backend startup time
3807  */
3808  if (!IsUnderPostmaster)
3810 
3811  /*
3812  * POSTGRES main processing loop begins here
3813  *
3814  * If an exception is encountered, processing resumes here so we abort the
3815  * current transaction and start a new one.
3816  *
3817  * You might wonder why this isn't coded as an infinite loop around a
3818  * PG_TRY construct. The reason is that this is the bottom of the
3819  * exception stack, and so with PG_TRY there would be no exception handler
3820  * in force at all during the CATCH part. By leaving the outermost setjmp
3821  * always active, we have at least some chance of recovering from an error
3822  * during error recovery. (If we get into an infinite loop thereby, it
3823  * will soon be stopped by overflow of elog.c's internal state stack.)
3824  *
3825  * Note that we use sigsetjmp(..., 1), so that this function's signal mask
3826  * (to wit, UnBlockSig) will be restored when longjmp'ing to here. This
3827  * is essential in case we longjmp'd out of a signal handler on a platform
3828  * where that leaves the signal blocked. It's not redundant with the
3829  * unblock in AbortTransaction() because the latter is only called if we
3830  * were inside a transaction.
3831  */
3832 
3833  if (sigsetjmp(local_sigjmp_buf, 1) != 0)
3834  {
3835  /*
3836  * NOTE: if you are tempted to add more code in this if-block,
3837  * consider the high probability that it should be in
3838  * AbortTransaction() instead. The only stuff done directly here
3839  * should be stuff that is guaranteed to apply *only* for outer-level
3840  * error recovery, such as adjusting the FE/BE protocol status.
3841  */
3842 
3843  /* Since not using PG_TRY, must reset error stack by hand */
3845 
3846  /* Prevent interrupts while cleaning up */
3847  HOLD_INTERRUPTS();
3848 
3849  /*
3850  * Forget any pending QueryCancel request, since we're returning to
3851  * the idle loop anyway, and cancel any active timeout requests. (In
3852  * future we might want to allow some timeout requests to survive, but
3853  * at minimum it'd be necessary to do reschedule_timeouts(), in case
3854  * we got here because of a query cancel interrupting the SIGALRM
3855  * interrupt handler.) Note in particular that we must clear the
3856  * statement and lock timeout indicators, to prevent any future plain
3857  * query cancels from being misreported as timeouts in case we're
3858  * forgetting a timeout cancel.
3859  */
3860  disable_all_timeouts(false);
3861  QueryCancelPending = false; /* second to avoid race condition */
3862 
3863  /* Not reading from the client anymore. */
3864  DoingCommandRead = false;
3865 
3866  /* Make sure libpq is in a good state */
3867  pq_comm_reset();
3868 
3869  /* Report the error to the client and/or server log */
3870  EmitErrorReport();
3871 
3872  /*
3873  * Make sure debug_query_string gets reset before we possibly clobber
3874  * the storage it points at.
3875  */
3877 
3878  /*
3879  * Abort the current transaction in order to recover.
3880  */
3882 
3883  if (am_walsender)
3885 
3886  /*
3887  * We can't release replication slots inside AbortTransaction() as we
3888  * need to be able to start and abort transactions while having a slot
3889  * acquired. But we never need to hold them across top level errors,
3890  * so releasing here is fine. There's another cleanup in ProcKill()
3891  * ensuring we'll correctly cleanup on FATAL errors as well.
3892  */
3893  if (MyReplicationSlot != NULL)
3895 
3896  /* We also want to cleanup temporary slots on error. */
3898 
3899  /*
3900  * Now return to normal top-level context and clear ErrorContext for
3901  * next time.
3902  */
3904  FlushErrorState();
3905 
3906  /*
3907  * If we were handling an extended-query-protocol message, initiate
3908  * skip till next Sync. This also causes us not to issue
3909  * ReadyForQuery (until we get Sync).
3910  */
3912  ignore_till_sync = true;
3913 
3914  /* We don't have a transaction command open anymore */
3915  xact_started = false;
3916 
3917  /*
3918  * If an error occurred while we were reading a message from the
3919  * client, we have potentially lost track of where the previous
3920  * message ends and the next one begins. Even though we have
3921  * otherwise recovered from the error, we cannot safely read any more
3922  * messages from the client, so there isn't much we can do with the
3923  * connection anymore.
3924  */
3925  if (pq_is_reading_msg())
3926  ereport(FATAL,
3927  (errcode(ERRCODE_PROTOCOL_VIOLATION),
3928  errmsg("terminating connection because protocol synchronization was lost")));
3929 
3930  /* Now we can allow interrupts again */
3932  }
3933 
3934  /* We can now handle ereport(ERROR) */
3935  PG_exception_stack = &local_sigjmp_buf;
3936 
3937  if (!ignore_till_sync)
3938  send_ready_for_query = true; /* initially, or after error */
3939 
3940  /*
3941  * Non-error queries loop here.
3942  */
3943 
3944  for (;;)
3945  {
3946  /*
3947  * At top of loop, reset extended-query-message flag, so that any
3948  * errors encountered in "idle" state don't provoke skip.
3949  */
3951 
3952  /*
3953  * Release storage left over from prior query cycle, and create a new
3954  * query input buffer in the cleared MessageContext.
3955  */
3958 
3959  initStringInfo(&input_message);
3960 
3961  /*
3962  * Also consider releasing our catalog snapshot if any, so that it's
3963  * not preventing advance of global xmin while we wait for the client.
3964  */
3966 
3967  /*
3968  * (1) If we've reached idle state, tell the frontend we're ready for
3969  * a new query.
3970  *
3971  * Note: this includes fflush()'ing the last of the prior output.
3972  *
3973  * This is also a good time to send collected statistics to the
3974  * collector, and to update the PS stats display. We avoid doing
3975  * those every time through the message loop because it'd slow down
3976  * processing of batched messages, and because we don't want to report
3977  * uncommitted updates (that confuses autovacuum). The notification
3978  * processor wants a call too, if we are not in a transaction block.
3979  */
3980  if (send_ready_for_query)
3981  {
3983  {
3984  set_ps_display("idle in transaction (aborted)", false);
3986 
3987  /* Start the idle-in-transaction timer */
3989  {
3990  disable_idle_in_transaction_timeout = true;
3993  }
3994  }
3996  {
3997  set_ps_display("idle in transaction", false);
3999 
4000  /* Start the idle-in-transaction timer */
4002  {
4003  disable_idle_in_transaction_timeout = true;
4006  }
4007  }
4008  else
4009  {
4011  pgstat_report_stat(false);
4012 
4013  set_ps_display("idle", false);
4015  }
4016 
4018  send_ready_for_query = false;
4019  }
4020 
4021  /*
4022  * (2) Allow asynchronous signals to be executed immediately if they
4023  * come in while we are waiting for client input. (This must be
4024  * conditional since we don't want, say, reads on behalf of COPY FROM
4025  * STDIN doing the same thing.)
4026  */
4027  DoingCommandRead = true;
4028 
4029  /*
4030  * (3) read a command (loop blocks here)
4031  */
4032  firstchar = ReadCommand(&input_message);
4033 
4034  /*
4035  * (4) disable async signal conditions again.
4036  *
4037  * Query cancel is supposed to be a no-op when there is no query in
4038  * progress, so if a query cancel arrived while we were idle, just
4039  * reset QueryCancelPending. ProcessInterrupts() has that effect when
4040  * it's called when DoingCommandRead is set, so check for interrupts
4041  * before resetting DoingCommandRead.
4042  */
4044  DoingCommandRead = false;
4045 
4046  /*
4047  * (5) turn off the idle-in-transaction timeout
4048  */
4049  if (disable_idle_in_transaction_timeout)
4050  {
4052  disable_idle_in_transaction_timeout = false;
4053  }
4054 
4055  /*
4056  * (6) check for any other interesting events that happened while we
4057  * slept.
4058  */
4059  if (ConfigReloadPending)
4060  {
4061  ConfigReloadPending = false;
4063  }
4064 
4065  /*
4066  * (7) process the command. But ignore it if we're skipping till
4067  * Sync.
4068  */
4069  if (ignore_till_sync && firstchar != EOF)
4070  continue;
4071 
4072  switch (firstchar)
4073  {
4074  case 'Q': /* simple query */
4075  {
4076  const char *query_string;
4077 
4078  /* Set statement_timestamp() */
4080 
4081  query_string = pq_getmsgstring(&input_message);
4082  pq_getmsgend(&input_message);
4083 
4084  if (am_walsender)
4085  {
4086  if (!exec_replication_command(query_string))
4087  exec_simple_query(query_string);
4088  }
4089  else
4090  exec_simple_query(query_string);
4091 
4092  send_ready_for_query = true;
4093  }
4094  break;
4095 
4096  case 'P': /* parse */
4097  {
4098  const char *stmt_name;
4099  const char *query_string;
4100  int numParams;
4101  Oid *paramTypes = NULL;
4102 
4103  forbidden_in_wal_sender(firstchar);
4104 
4105  /* Set statement_timestamp() */
4107 
4108  stmt_name = pq_getmsgstring(&input_message);
4109  query_string = pq_getmsgstring(&input_message);
4110  numParams = pq_getmsgint(&input_message, 2);
4111  if (numParams > 0)
4112  {
4113  int i;
4114 
4115  paramTypes = (Oid *) palloc(numParams * sizeof(Oid));
4116  for (i = 0; i < numParams; i++)
4117  paramTypes[i] = pq_getmsgint(&input_message, 4);
4118  }
4119  pq_getmsgend(&input_message);
4120 
4121  exec_parse_message(query_string, stmt_name,
4122  paramTypes, numParams);
4123  }
4124  break;
4125 
4126  case 'B': /* bind */
4127  forbidden_in_wal_sender(firstchar);
4128 
4129  /* Set statement_timestamp() */
4131 
4132  /*
4133  * this message is complex enough that it seems best to put
4134  * the field extraction out-of-line
4135  */
4136  exec_bind_message(&input_message);
4137  break;
4138 
4139  case 'E': /* execute */
4140  {
4141  const char *portal_name;
4142  int max_rows;
4143 
4144  forbidden_in_wal_sender(firstchar);
4145 
4146  /* Set statement_timestamp() */
4148 
4149  portal_name = pq_getmsgstring(&input_message);
4150  max_rows = pq_getmsgint(&input_message, 4);
4151  pq_getmsgend(&input_message);
4152 
4153  exec_execute_message(portal_name, max_rows);
4154  }
4155  break;
4156 
4157  case 'F': /* fastpath function call */
4158  forbidden_in_wal_sender(firstchar);
4159 
4160  /* Set statement_timestamp() */
4162 
4163  /* Report query to various monitoring facilities. */
4165  set_ps_display("<FASTPATH>", false);
4166 
4167  /* start an xact for this function invocation */
4169 
4170  /*
4171  * Note: we may at this point be inside an aborted
4172  * transaction. We can't throw error for that until we've
4173  * finished reading the function-call message, so
4174  * HandleFunctionRequest() must check for it after doing so.
4175  * Be careful not to do anything that assumes we're inside a
4176  * valid transaction here.
4177  */
4178 
4179  /* switch back to message context */
4181 
4182  HandleFunctionRequest(&input_message);
4183 
4184  /* commit the function-invocation transaction */
4186 
4187  send_ready_for_query = true;
4188  break;
4189 
4190  case 'C': /* close */
4191  {
4192  int close_type;
4193  const char *close_target;
4194 
4195  forbidden_in_wal_sender(firstchar);
4196 
4197  close_type = pq_getmsgbyte(&input_message);
4198  close_target = pq_getmsgstring(&input_message);
4199  pq_getmsgend(&input_message);
4200 
4201  switch (close_type)
4202  {
4203  case 'S':
4204  if (close_target[0] != '\0')
4205  DropPreparedStatement(close_target, false);
4206  else
4207  {
4208  /* special-case the unnamed statement */
4210  }
4211  break;
4212  case 'P':
4213  {
4214  Portal portal;
4215 
4216  portal = GetPortalByName(close_target);
4217  if (PortalIsValid(portal))
4218  PortalDrop(portal, false);
4219  }
4220  break;
4221  default:
4222  ereport(ERROR,
4223  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4224  errmsg("invalid CLOSE message subtype %d",
4225  close_type)));
4226  break;
4227  }
4228 
4230  pq_putemptymessage('3'); /* CloseComplete */
4231  }
4232  break;
4233 
4234  case 'D': /* describe */
4235  {
4236  int describe_type;
4237  const char *describe_target;
4238 
4239  forbidden_in_wal_sender(firstchar);
4240 
4241  /* Set statement_timestamp() (needed for xact) */
4243 
4244  describe_type = pq_getmsgbyte(&input_message);
4245  describe_target = pq_getmsgstring(&input_message);
4246  pq_getmsgend(&input_message);
4247 
4248  switch (describe_type)
4249  {
4250  case 'S':
4251  exec_describe_statement_message(describe_target);
4252  break;
4253  case 'P':
4254  exec_describe_portal_message(describe_target);
4255  break;
4256  default:
4257  ereport(ERROR,
4258  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4259  errmsg("invalid DESCRIBE message subtype %d",
4260  describe_type)));
4261  break;
4262  }
4263  }
4264  break;
4265 
4266  case 'H': /* flush */
4267  pq_getmsgend(&input_message);
4269  pq_flush();
4270  break;
4271 
4272  case 'S': /* sync */
4273  pq_getmsgend(&input_message);
4275  send_ready_for_query = true;
4276  break;
4277 
4278  /*
4279  * 'X' means that the frontend is closing down the socket. EOF
4280  * means unexpected loss of frontend connection. Either way,
4281  * perform normal shutdown.
4282  */
4283  case 'X':
4284  case EOF:
4285 
4286  /*
4287  * Reset whereToSendOutput to prevent ereport from attempting
4288  * to send any more messages to client.
4289  */
4292 
4293  /*
4294  * NOTE: if you are tempted to add more code here, DON'T!
4295  * Whatever you had in mind to do should be set up as an
4296  * on_proc_exit or on_shmem_exit callback, instead. Otherwise
4297  * it will fail to be called during other backend-shutdown
4298  * scenarios.
4299  */
4300  proc_exit(0);
4301 
4302  case 'd': /* copy data */
4303  case 'c': /* copy done */
4304  case 'f': /* copy fail */
4305 
4306  /*
4307  * Accept but ignore these messages, per protocol spec; we
4308  * probably got here because a COPY failed, and the frontend
4309  * is still sending data.
4310  */
4311  break;
4312 
4313  default:
4314  ereport(FATAL,
4315  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4316  errmsg("invalid frontend message type %d",
4317  firstchar)));
4318  }
4319  } /* end of input-reading loop */
4320 }
4321 
4322 /*
4323  * Throw an error if we're a WAL sender process.
4324  *
4325  * This is used to forbid anything else than simple query protocol messages
4326  * in a WAL sender process. 'firstchar' specifies what kind of a forbidden
4327  * message was received, and is used to construct the error message.
4328  */
4329 static void
4331 {
4332  if (am_walsender)
4333  {
4334  if (firstchar == 'F')
4335  ereport(ERROR,
4336  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4337  errmsg("fastpath function calls not supported in a replication connection")));
4338  else
4339  ereport(ERROR,
4340  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4341  errmsg("extended query protocol not supported in a replication connection")));
4342  }
4343 }
4344 
4345 
4346 /*
4347  * Obtain platform stack depth limit (in bytes)
4348  *
4349  * Return -1 if unknown
4350  */
4351 long
4353 {
4354 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_STACK)
4355  static long val = 0;
4356 
4357  /* This won't change after process launch, so check just once */
4358  if (val == 0)
4359  {
4360  struct rlimit rlim;
4361 
4362  if (getrlimit(RLIMIT_STACK, &rlim) < 0)
4363  val = -1;
4364  else if (rlim.rlim_cur == RLIM_INFINITY)
4365  val = LONG_MAX;
4366  /* rlim_cur is probably of an unsigned type, so check for overflow */
4367  else if (rlim.rlim_cur >= LONG_MAX)
4368  val = LONG_MAX;
4369  else
4370  val = rlim.rlim_cur;
4371  }
4372  return val;
4373 #else /* no getrlimit */
4374 #if defined(WIN32) || defined(__CYGWIN__)
4375  /* On Windows we set the backend stack size in src/backend/Makefile */
4376  return WIN32_STACK_RLIMIT;
4377 #else /* not windows ... give up */
4378  return -1;
4379 #endif
4380 #endif
4381 }
4382 
4383 
4384 static struct rusage Save_r;
4385 static struct timeval Save_t;
4386 
4387 void
4389 {
4392 }
4393 
4394 void
4395 ShowUsage(const char *title)
4396 {
4397  StringInfoData str;
4398  struct timeval user,
4399  sys;
4400  struct timeval elapse_t;
4401  struct rusage r;
4402 
4403  getrusage(RUSAGE_SELF, &r);
4404  gettimeofday(&elapse_t, NULL);
4405  memcpy((char *) &user, (char *) &r.ru_utime, sizeof(user));
4406  memcpy((char *) &sys, (char *) &r.ru_stime, sizeof(sys));
4407  if (elapse_t.tv_usec < Save_t.tv_usec)
4408  {
4409  elapse_t.tv_sec--;
4410  elapse_t.tv_usec += 1000000;
4411  }
4412  if (r.ru_utime.tv_usec < Save_r.ru_utime.tv_usec)
4413  {
4414  r.ru_utime.tv_sec--;
4415  r.ru_utime.tv_usec += 1000000;
4416  }
4417  if (r.ru_stime.tv_usec < Save_r.ru_stime.tv_usec)
4418  {
4419  r.ru_stime.tv_sec--;
4420  r.ru_stime.tv_usec += 1000000;
4421  }
4422 
4423  /*
4424  * the only stats we don't show here are for memory usage -- i can't
4425  * figure out how to interpret the relevant fields in the rusage struct,
4426  * and they change names across o/s platforms, anyway. if you can figure
4427  * out what the entries mean, you can somehow extract resident set size,
4428  * shared text size, and unshared data and stack sizes.
4429  */
4430  initStringInfo(&str);
4431 
4432  appendStringInfoString(&str, "! system usage stats:\n");
4433  appendStringInfo(&str,
4434  "!\t%ld.%06ld s user, %ld.%06ld s system, %ld.%06ld s elapsed\n",
4435  (long) (r.ru_utime.tv_sec - Save_r.ru_utime.tv_sec),
4436  (long) (r.ru_utime.tv_usec - Save_r.ru_utime.tv_usec),
4437  (long) (r.ru_stime.tv_sec - Save_r.ru_stime.tv_sec),
4438  (long) (r.ru_stime.tv_usec - Save_r.ru_stime.tv_usec),
4439  (long) (elapse_t.tv_sec - Save_t.tv_sec),
4440  (long) (elapse_t.tv_usec - Save_t.tv_usec));
4441  appendStringInfo(&str,
4442  "!\t[%ld.%06ld s user, %ld.%06ld s system total]\n",
4443  (long) user.tv_sec,
4444  (long) user.tv_usec,
4445  (long) sys.tv_sec,
4446  (long) sys.tv_usec);
4447 #if defined(HAVE_GETRUSAGE)
4448  appendStringInfo(&str,
4449  "!\t%ld/%ld [%ld/%ld] filesystem blocks in/out\n",
4450  r.ru_inblock - Save_r.ru_inblock,
4451  /* they only drink coffee at dec */
4452  r.ru_oublock - Save_r.ru_oublock,
4453  r.ru_inblock, r.ru_oublock);
4454  appendStringInfo(&str,
4455  "!\t%ld/%ld [%ld/%ld] page faults/reclaims, %ld [%ld] swaps\n",
4456  r.ru_majflt - Save_r.ru_majflt,
4457  r.ru_minflt - Save_r.ru_minflt,
4458  r.ru_majflt, r.ru_minflt,
4459  r.ru_nswap - Save_r.ru_nswap,
4460  r.ru_nswap);
4461  appendStringInfo(&str,
4462  "!\t%ld [%ld] signals rcvd, %ld/%ld [%ld/%ld] messages rcvd/sent\n",
4463  r.ru_nsignals - Save_r.ru_nsignals,
4464  r.ru_nsignals,
4465  r.ru_msgrcv - Save_r.ru_msgrcv,
4466  r.ru_msgsnd - Save_r.ru_msgsnd,
4467  r.ru_msgrcv, r.ru_msgsnd);
4468  appendStringInfo(&str,
4469  "!\t%ld/%ld [%ld/%ld] voluntary/involuntary context switches\n",
4470  r.ru_nvcsw - Save_r.ru_nvcsw,
4471  r.ru_nivcsw - Save_r.ru_nivcsw,
4472  r.ru_nvcsw, r.ru_nivcsw);
4473 #endif /* HAVE_GETRUSAGE */
4474 
4475  /* remove trailing newline */
4476  if (str.data[str.len - 1] == '\n')
4477  str.data[--str.len] = '\0';
4478 
4479  ereport(LOG,
4480  (errmsg_internal("%s", title),
4481  errdetail_internal("%s", str.data)));
4482 
4483  pfree(str.data);
4484 }
4485 
4486 /*
4487  * on_proc_exit handler to log end of session
4488  */
4489 static void
4491 {
4492  Port *port = MyProcPort;
4493  long secs;
4494  int usecs;
4495  int msecs;
4496  int hours,
4497  minutes,
4498  seconds;
4499 
4502  &secs, &usecs);
4503  msecs = usecs / 1000;
4504 
4505  hours = secs / SECS_PER_HOUR;
4506  secs %= SECS_PER_HOUR;
4507  minutes = secs / SECS_PER_MINUTE;
4508  seconds = secs % SECS_PER_MINUTE;
4509 
4510  ereport(LOG,
4511  (errmsg("disconnection: session time: %d:%02d:%02d.%03d "
4512  "user=%s database=%s host=%s%s%s",
4513  hours, minutes, seconds, msecs,
4514  port->user_name, port->database_name, port->remote_host,
4515  port->remote_port[0] ? " port=" : "", port->remote_port)));
4516 }
pg_stack_base_t set_stack_base(void)
Definition: postgres.c:3064
signed short int16
Definition: c.h:255
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Definition: sinval.c:177
static bool IsTransactionStmtList(List *pstmts)
Definition: postgres.c:2516
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Definition: timeout.c:340
MemoryContext context
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ParamExternData params[FLEXIBLE_ARRAY_MEMBER]
Definition: params.h:76
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Datum value
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volatile uint32 InterruptHoldoffCount
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GucContext
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void SetRemoteDestReceiverParams(DestReceiver *self, Portal portal)
Definition: printtup.c:101
Portal CreatePortal(const char *name, bool allowDup, bool dupSilent)
Definition: portalmem.c:174
static void exec_describe_portal_message(const char *portal_name)
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TimestampTz get_timeout_finish_time(TimeoutId id)
Definition: timeout.c:667
void(* rDestroy)(DestReceiver *self)
Definition: dest.h:126
#define IsA(nodeptr, _type_)
Definition: nodes.h:560
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Definition: gettimeofday.c:105
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Definition: mcxt.c:200
bool IsWaitingForLock(void)
Definition: proc.c:660
void RecoveryConflictInterrupt(ProcSignalReason reason)
Definition: postgres.c:2705
#define HOLD_CANCEL_INTERRUPTS()
Definition: miscadmin.h:125
List * QueryRewrite(Query *parsetree)
void BeginReportingGUCOptions(void)
Definition: guc.c:5360
#define DEBUG1
Definition: elog.h:25
int MyProcPid
Definition: globals.c:39
int errhint(const char *fmt,...)
Definition: elog.c:987
int stmt_location
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void getTypeOutputInfo(Oid type, Oid *typOutput, bool *typIsVarlena)
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CachedPlan * GetCachedPlan(CachedPlanSource *plansource, ParamListInfo boundParams, bool useResOwner, QueryEnvironment *queryEnv)
Definition: plancache.c:1135
void PortalSetResultFormat(Portal portal, int nFormats, int16 *formats)
Definition: pquery.c:627
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Definition: params.h:73
bool analyze_requires_snapshot(RawStmt *parseTree)
Definition: analyze.c:348
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Definition: fastpath.c:79
List * raw_parser(const char *str)
Definition: parser.c:36
#define pq_flush()
Definition: libpq.h:39
static int ReadCommand(StringInfo inBuf)
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struct Port * MyProcPort
Definition: globals.c:41
void PortalStart(Portal portal, ParamListInfo params, int eflags, Snapshot snapshot)
Definition: pquery.c:445
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Definition: pgstat.c:1486
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bool visible
Definition: portal.h:192
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Definition: globals.c:33
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bool log_parser_stats
Definition: guc.c:438
bool equal(const void *a, const void *b)
Definition: equalfuncs.c:2962
void PortalDefineQuery(Portal portal, const char *prepStmtName, const char *sourceText, const char *commandTag, List *stmts, CachedPlan *cplan)
Definition: portalmem.c:277
bool exec_replication_command(const char *cmd_string)
Definition: walsender.c:1411
bool log_statement_stats
Definition: guc.c:441
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1570
#define GUC_check_errdetail
Definition: guc.h:407
const char * commandTag
Definition: plancache.h:85
void on_proc_exit(pg_on_exit_callback function, Datum arg)
Definition: ipc.c:292
void pgstat_report_activity(BackendState state, const char *cmd_str)
Definition: pgstat.c:2994
QueryEnvironment * p_queryEnv
Definition: parse_node.h:195
CachedPlanSource * plansource
Definition: prepare.h:31
PGPROC * MyProc
Definition: proc.c:67
const char * pq_getmsgstring(StringInfo msg)
Definition: pqformat.c:621
void ShowUsage(const char *title)
Definition: postgres.c:4395
void MemoryContextSetParent(MemoryContext context, MemoryContext new_parent)
Definition: mcxt.c:317
Portal GetPortalByName(const char *name)
Definition: portalmem.c:129
#define CURSOR_OPT_BINARY
Definition: parsenodes.h:2614
char * pstrdup(const char *in)
Definition: mcxt.c:1077
void CommitTransactionCommand(void)
Definition: xact.c:2748
void InitStandaloneProcess(const char *argv0)
Definition: miscinit.c:219
void ParseLongOption(const char *string, char **name, char **value)
Definition: guc.c:9374
void ValidatePgVersion(const char *path)
Definition: miscinit.c:1349
bool IsAbortedTransactionBlockState(void)
Definition: xact.c:370
bool set_plan_disabling_options(const char *arg, GucContext context, GucSource source)
Definition: postgres.c:3241
static struct rusage Save_r
Definition: postgres.c:4384
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
volatile uint32 QueryCancelHoldoffCount
Definition: globals.c:36
void set_ps_display(const char *activity, bool force)
Definition: ps_status.c:326
static void forbidden_in_wal_sender(char firstchar)
Definition: postgres.c:4330
Definition: nodes.h:509
bool PortalRun(Portal portal, long count, bool isTopLevel, bool run_once, DestReceiver *dest, DestReceiver *altdest, char *completionTag)
Definition: pquery.c:689
void proc_exit(int code)
Definition: ipc.c:99
int errcode(int sqlerrcode)
Definition: elog.c:575
Definition: libpq-be.h:116
int errhidestmt(bool hide_stmt)
Definition: elog.c:1068
Query * parse_analyze_varparams(RawStmt *parseTree, const char *sourceText, Oid **paramTypes, int *numParams)
Definition: analyze.c:130
bool IsTransactionOrTransactionBlock(void)
Definition: xact.c:4323
const char * get_stats_option_name(const char *arg)
Definition: postgres.c:3283
static List * new_list(NodeTag type)
Definition: list.c:63
void pq_putemptymessage(char msgtype)
Definition: pqformat.c:421
#define SetProcessingMode(mode)
Definition: miscadmin.h:376
return result
Definition: formatting.c:1633
void BaseInit(void)
Definition: postinit.c:517
static int errdetail_abort(void)
Definition: postgres.c:2240
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
char * remote_port
Definition: libpq-be.h:128
void PopActiveSnapshot(void)
Definition: snapmgr.c:812
void set_debug_options(int debug_flag, GucContext context, GucSource source)
Definition: postgres.c:3212
struct timeval ru_stime
Definition: rusagestub.h:29
void BeginCommand(const char *commandTag, CommandDest dest)
Definition: dest.c:99
ParserSetupHook parserSetup
Definition: params.h:72
struct ParamListInfoData * ParamListInfo
Definition: params.h:62
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:638
#define PG_PROTOCOL_MAJOR(v)
Definition: pqcomm.h:104
Node * utilityStmt
Definition: parsenodes.h:118
List * stmts
Definition: portal.h:136
#define linitial_node(type, l)
Definition: pg_list.h:114
volatile bool QueryCancelPending
Definition: globals.c:30
const char * progname
Definition: pg_standby.c:37
void restore_stack_base(pg_stack_base_t base)
Definition: postgres.c:3095
bool IsLogicalWorker(void)
Definition: worker.c:1644
Snapshot GetTransactionSnapshot(void)
Definition: snapmgr.c:304
#define OidIsValid(objectId)
Definition: c.h:538
void SendRowDescriptionMessage(TupleDesc typeinfo, List *targetlist, int16 *formats)
Definition: printtup.c:188
bool IsBinaryUpgrade
Definition: globals.c:102
int stmt_len
Definition: plannodes.h:98
#define SIGQUIT
Definition: win32.h:189
PlannedStmt * planner(Query *parse, int cursorOptions, ParamListInfo boundParams)
Definition: planner.c:203
int getopt(int nargc, char *const *nargv, const char *ostr)
Definition: getopt.c:72
void FlushErrorState(void)
Definition: elog.c:1587
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
void pq_beginmessage(StringInfo buf, char msgtype)
Definition: pqformat.c:88
void StatementCancelHandler(SIGNAL_ARGS)
Definition: postgres.c:2648
const char * pq_getmsgbytes(StringInfo msg, int datalen)
Definition: pqformat.c:550
signed int int32
Definition: c.h:256
static void exec_execute_message(const char *portal_name, long max_rows)
Definition: postgres.c:1840
int errdetail_internal(const char *fmt,...)
Definition: elog.c:900
GucSource
Definition: guc.h:105
static bool IsTransactionExitStmt(Node *parsetree)
Definition: postgres.c:2484
static void log_disconnections(int code, Datum arg)
Definition: postgres.c:4490
ParseState * make_parsestate(ParseState *parentParseState)
Definition: parse_node.c:44
TupleDesc resultDesc
Definition: plancache.h:92
#define RESUME_INTERRUPTS()
Definition: miscadmin.h:119
ErrorContextCallback * error_context_stack
Definition: elog.c:88
int check_log_duration(char *msec_str, bool was_logged)
Definition: postgres.c:2100
#define list_make1(x1)
Definition: pg_list.h:139
volatile bool ClientConnectionLost
Definition: globals.c:32
volatile bool ParallelMessagePending
Definition: parallel.c:97
void pqinitmask(void)
Definition: pqsignal.c:41
static int errdetail_execute(List *raw_parsetree_list)
Definition: postgres.c:2145
bool ClientAuthInProgress
Definition: postmaster.c:349
void ResetUsage(void)
Definition: postgres.c:4388
void * paramFetchArg
Definition: params.h:71
bool am_walsender
Definition: walsender.c:114
bool check_max_stack_depth(int *newval, void **extra, GucSource source)
Definition: postgres.c:3180
bool Debug_print_plan
Definition: guc.c:433
#define appendStringInfoCharMacro(str, ch)
Definition: stringinfo.h:127
ParamFetchHook paramFetch
Definition: params.h:70
void pfree(void *pointer)
Definition: mcxt.c:950
ParamListInfo portalParams
Definition: portal.h:139
char * pg_client_to_server(const char *s, int len)
Definition: mbutils.c:556
#define SIG_IGN
Definition: win32.h:185
void disable_all_timeouts(bool keep_indicators)
Definition: timeout.c:596
int optind
Definition: getopt.c:51
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:78
void EndCommand(const char *commandTag, CommandDest dest)
Definition: dest.c:157
#define ERROR
Definition: elog.h:43
void CreateDataDirLockFile(bool amPostmaster)
Definition: miscinit.c:1080
void pq_startmsgread(void)
Definition: pqcomm.c:1210
void ProcessNotifyInterrupt(void)
Definition: async.c:1726
static int InteractiveBackend(StringInfo inBuf)
Definition: postgres.c:203
bool pq_is_reading_msg(void)
Definition: pqcomm.c:1250
void on_exit_reset(void)
Definition: ipc.c:396
int IdleInTransactionSessionTimeout
Definition: proc.c:63
int32 MyCancelKey
Definition: globals.c:42
static int interactive_getc(void)
Definition: postgres.c:291
void WalSndSignals(void)
Definition: walsender.c:2928
void ProcessInterrupts(void)
Definition: postgres.c:2825
#define FATAL
Definition: elog.h:52
List * pg_parse_query(const char *query_string)
Definition: postgres.c:596
void MemoryContextStats(MemoryContext context)
Definition: mcxt.c:438
#define MAXPGPATH
bool Debug_print_parse
Definition: guc.c:434
static struct @121 value
TimestampTz SessionStartTime
Definition: libpq-be.h:151
const char * commandTag
Definition: portal.h:135
Datum OidReceiveFunctionCall(Oid functionId, StringInfo buf, Oid typioparam, int32 typmod)
Definition: fmgr.c:1756
void PostgresMain(int argc, char *argv[], const char *dbname, const char *username)
Definition: postgres.c:3582
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:165
#define lfirst_node(type, lc)
Definition: pg_list.h:109
#define DEBUG2
Definition: elog.h:24
void InitProcess(void)
Definition: proc.c:287
void HandleParallelMessages(void)
Definition: parallel.c:692
void appendStringInfoString(StringInfo str, const char *s)
Definition: stringinfo.c:157
Definition: dest.h:88
Oid * param_types
Definition: plancache.h:86
char * c
int stmt_location
Definition: plannodes.h:97
Node * stmt
Definition: parsenodes.h:1411
char OutputFileName[MAXPGPATH]
Definition: globals.c:62
void SetConfigOption(const char *name, const char *value, GucContext context, GucSource source)
Definition: guc.c:6672
static char * buf
Definition: pg_test_fsync.c:66
static struct timeval Save_t
Definition: postgres.c:4385
void PushActiveSnapshot(Snapshot snap)
Definition: snapmgr.c:733
List * CachedPlanGetTargetList(CachedPlanSource *plansource, QueryEnvironment *queryEnv)
Definition: plancache.c:1425
bool recoveryConflictPending
Definition: proc.h:123
void check_stack_depth(void)
Definition: postgres.c:3117
bool IsUnderPostmaster
Definition: globals.c:101
static CachedPlanSource * unnamed_stmt_psrc
Definition: postgres.c:151
DestReceiver * CreateDestReceiver(CommandDest dest)
Definition: dest.c:109
static void exec_bind_message(StringInfo input_message)
Definition: postgres.c:1457
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:873
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:152
Node * utilityStmt
Definition: plannodes.h:94
void PostgresSigHupHandler(SIGNAL_ARGS)
Definition: postgres.c:2688
char * user_name
Definition: libpq-be.h:137
void ChangeToDataDir(void)
Definition: miscinit.c:115
int opterr
Definition: getopt.c:50
void resetStringInfo(StringInfo str)
Definition: stringinfo.c:62
void ReplicationSlotRelease(void)
Definition: slot.c:373
sigset_t UnBlockSig
Definition: pqsignal.c:22
void(* ParserSetupHook)(struct ParseState *pstate, void *arg)
Definition: params.h:66
bool ActiveSnapshotSet(void)
Definition: snapmgr.c:851
static int SocketBackend(StringInfo inBuf)
Definition: postgres.c:319
struct Bitmapset * paramMask
Definition: params.h:75
static bool xact_started
Definition: postgres.c:130
const char * p_sourcetext
Definition: parse_node.h:171
void InitWalSender(void)
volatile uint32 CritSectionCount
Definition: globals.c:37
static int errdetail_params(ParamListInfo params)
Definition: postgres.c:2176
void getTypeBinaryInputInfo(Oid type, Oid *typReceive, Oid *typIOParam)
Definition: lsyscache.c:2665
char * portalname
Definition: parsenodes.h:2665
bool IsAutoVacuumWorkerProcess(void)
Definition: autovacuum.c:3361
#define lnext(lc)
Definition: pg_list.h:105
void getTypeInputInfo(Oid type, Oid *typInput, Oid *typIOParam)
Definition: lsyscache.c:2599
#define ereport(elevel, rest)
Definition: elog.h:122
int max_stack_depth
Definition: postgres.c:96
void LockErrorCleanup(void)
Definition: proc.c:677
#define SECS_PER_HOUR
Definition: timestamp.h:87
MemoryContext TopMemoryContext
Definition: mcxt.c:43
const char * CreateCommandTag(Node *parsetree)
Definition: utility.c:2036
static int port
Definition: pg_regress.c:89
static ProcSignalReason RecoveryConflictReason
Definition: postgres.c:161
Definition: guc.h:72
long get_stack_depth_rlimit(void)
Definition: postgres.c:4352
struct ParamExternData ParamExternData
List * lappend(List *list, void *datum)
Definition: list.c:128
static bool RecoveryConflictPending
Definition: postgres.c:159
volatile sig_atomic_t ConfigReloadPending
Definition: globals.c:34
void appendStringInfoChar(StringInfo str, char ch)
Definition: stringinfo.c:169
void initStringInfo(StringInfo str)
Definition: stringinfo.c:46
#define WARNING
Definition: elog.h:40
const char * debug_query_string
Definition: postgres.c:85
uint32 ProtocolVersion
Definition: pqcomm.h:113
int pq_getmessage(StringInfo s, int maxlen)
Definition: pqcomm.c:1272
static List * pg_rewrite_query(Query *query)
Definition: postgres.c:727
#define InvalidSnapshot
Definition: snapshot.h:25
#define MemoryContextResetAndDeleteChildren(ctx)
Definition: memutils.h:67
static bool check_log_statement(List *stmt_list)
Definition: postgres.c:2063
static void exec_parse_message(const char *query_string, const char *stmt_name, Oid *paramTypes, int numParams)
Definition: postgres.c:1195
#define PortalIsValid(p)
Definition: portal.h:199
static bool RecoveryConflictRetryable
Definition: postgres.c:160
static void start_xact_command(void)
Definition: postgres.c:2434
static bool doing_extended_query_message
Definition: postgres.c:143
sigset_t BlockSig
Definition: pqsignal.c:22
void process_session_preload_libraries(void)
Definition: miscinit.c:1491
bool canSetTag
Definition: plannodes.h:53
void WalSndErrorCleanup(void)
Definition: walsender.c:291
struct timeval ru_utime
Definition: rusagestub.h:28
MemoryContext AllocSetContextCreate(MemoryContext parent, const char *name, Size minContextSize, Size initBlockSize, Size maxBlockSize)
Definition: aset.c:322
bool ismove
Definition: parsenodes.h:2666
int16 * formats
Definition: portal.h:157
uintptr_t Datum
Definition: postgres.h:372
void CommandCounterIncrement(void)
Definition: xact.c:922
CmdType commandType
Definition: plannodes.h:45
bool SelectConfigFiles(const char *userDoption, const char *progname)
Definition: guc.c:4689
void ProcessClientReadInterrupt(bool blocked)
Definition: postgres.c:516
#define RUSAGE_SELF
Definition: rusagestub.h:23
int PostAuthDelay
Definition: postgres.c:99
bool get_timeout_indicator(TimeoutId id, bool reset_indicator)
Definition: timeout.c:633
static int errdetail_recovery_conflict(void)
Definition: postgres.c:2254
void EmitErrorReport(void)
Definition: elog.c:1446
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:452
#define SIGPIPE
Definition: win32.h:193
int pq_getbyte(void)
Definition: pqcomm.c:1000
#define SIGHUP
Definition: win32.h:188
void pq_endmsgread(void)
Definition: pqcomm.c:1234
static char * username
Definition: initdb.c:131
TupleDesc tupDesc
Definition: portal.h:155
#define InvalidOid
Definition: postgres_ext.h:36
#define SIG_DFL
Definition: win32.h:183
void SaveCachedPlan(CachedPlanSource *plansource)
Definition: plancache.c:441
Query * parse_analyze(RawStmt *parseTree, const char *sourceText, Oid *paramTypes, int numParams, QueryEnvironment *queryEnv)
Definition: analyze.c:96
pqsigfunc pqsignal(int signum, pqsigfunc handler)
Definition: signal.c:168
#define free(a)
Definition: header.h:65
CmdType commandType
Definition: parsenodes.h:110
volatile bool InterruptPending
Definition: globals.c:29
int pq_getmsgbyte(StringInfo msg)
Definition: pqformat.c:432
size_t strlcpy(char *dst, const char *src, size_t siz)
Definition: strlcpy.c:45
bool log_duration
Definition: guc.c:432
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
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:109
#define makeNode(_type_)
Definition: nodes.h:557
#define COMPLETION_TAG_BUFSIZE
Definition: dest.h:74
void SetLatch(volatile Latch *latch)
Definition: latch.c:415
#define pq_comm_reset()
Definition: libpq.h:38
#define SIGNAL_ARGS
Definition: c.h:1079
#define NULL
Definition: c.h:229
#define Assert(condition)
Definition: c.h:675
void ProcessCompletedNotifies(void)
Definition: async.c:1096
#define lfirst(lc)
Definition: pg_list.h:106
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:325
void HandleFunctionRequest(StringInfo msgBuf)
Definition: fastpath.c:261
void InvalidateCatalogSnapshotConditionally(void)
Definition: snapmgr.c:531
bool HoldingBufferPinThatDelaysRecovery(void)
Definition: bufmgr.c:3692
void StartTransactionCommand(void)
Definition: xact.c:2678
static bool DoingCommandRead
Definition: postgres.c:137
Query * transformTopLevelStmt(ParseState *pstate, RawStmt *parseTree)
Definition: analyze.c:187
bool canSetTag
Definition: parsenodes.h:116
uint16 pflags
Definition: params.h:58
const char * query_string
Definition: plancache.h:84
void InitializeMaxBackends(void)
Definition: postinit.c:495
char * dbname
Definition: streamutil.c:38
static int list_length(const List *l)
Definition: pg_list.h:89
#define newval
#define PortalGetHeapMemory(portal)
Definition: portal.h:205
bool IsTransactionState(void)
Definition: xact.c:350
MemoryContext MessageContext
Definition: mcxt.c:47
static bool IsTransactionExitStmtList(List *pstmts)
Definition: postgres.c:2501
List * pg_analyze_and_rewrite_params(RawStmt *parsetree, const char *query_string, ParserSetupHook parserSetup, void *parserSetupArg, QueryEnvironment *queryEnv)
Definition: postgres.c:675
Datum querytree(PG_FUNCTION_ARGS)
Definition: _int_bool.c:665
#define UNKNOWNOID
Definition: pg_type.h:431
struct RawStmt * raw_parse_tree
Definition: plancache.h:83
sigjmp_buf * PG_exception_stack
Definition: elog.c:90
const char * name
Definition: encode.c:521
int log_statement
Definition: postgres.c:93
int StatementTimeout
Definition: proc.c:61
static bool EchoQuery
Definition: postgres.c:155
char * stack_base_ptr
Definition: postgres.c:117
static const char * userDoption
Definition: postgres.c:154
bool IsSubTransaction(void)
Definition: xact.c:4377
volatile bool ProcDiePending
Definition: globals.c:31
bool atStart
Definition: portal.h:186
static bool UseSemiNewlineNewline
Definition: postgres.c:156
#define CURSOR_OPT_PARALLEL_OK
Definition: parsenodes.h:2623
void SetCurrentStatementStartTimestamp(void)
Definition: xact.c:740
char * remote_host
Definition: libpq-be.h:123
void InitPostgres(const char *in_dbname, Oid dboid, const char *username, Oid useroid, char *out_dbname)
Definition: postinit.c:558
char * OidOutputFunctionCall(Oid functionId, Datum val)
Definition: fmgr.c:1747
#define GUC_check_errhint
Definition: guc.h:411
void * palloc(Size size)
Definition: mcxt.c:849
int errmsg(const char *fmt,...)
Definition: elog.c:797
void PortalDrop(Portal portal, bool isTopCommit)
Definition: portalmem.c:461
void pq_sendint(StringInfo buf, int i, int b)
Definition: pqformat.c:236
void ReadyForQuery(CommandDest dest)
Definition: dest.c:241
void pq_endmessage(StringInfo buf)
Definition: pqformat.c:344
char * optarg
Definition: getopt.c:53
void die(SIGNAL_ARGS)
Definition: postgres.c:2617
bool IsLogicalLauncher(void)
Definition: launcher.c:907
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:117
int i
void FloatExceptionHandler(SIGNAL_ARGS)
Definition: postgres.c:2669
static void drop_unnamed_stmt(void)
Definition: postgres.c:2531
bool Debug_pretty_print
Definition: guc.c:436
char * name
Definition: parsenodes.h:3284
ProcSignalReason
Definition: procsignal.h:30
int pq_getstring(StringInfo s)
Definition: pqcomm.c:1166
void * arg
char * DataDir
Definition: globals.c:60
void DropCachedPlan(CachedPlanSource *plansource)
Definition: plancache.c:486
struct Latch * MyLatch
Definition: globals.c:52
void ReplicationSlotCleanup(void)
Definition: slot.c:427
volatile sig_atomic_t notifyInterruptPending
Definition: async.c:356
unsigned int pq_getmsgint(StringInfo msg, int b)
Definition: pqformat.c:448
bool Debug_print_rewritten
Definition: guc.c:435
volatile sig_atomic_t catchupInterruptPending
Definition: sinval.c:41
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:100
bool Log_disconnections
Definition: postgres.c:91
static char format
Definition: pg_basebackup.c:80
List * stmt_list
Definition: plancache.h:133
void process_postgres_switches(int argc, char *argv[], GucContext ctx, const char **dbname)
Definition: postgres.c:3323
#define elog
Definition: elog.h:219
void pq_getmsgend(StringInfo msg)
Definition: pqformat.c:677
void disable_timeout(TimeoutId id, bool keep_indicator)
Definition: timeout.c:525
int cursorOptions
Definition: portal.h:144
#define copyObject(obj)
Definition: nodes.h:622
void procsignal_sigusr1_handler(SIGNAL_ARGS)
Definition: procsignal.c:261
CommandDest whereToSendOutput
Definition: postgres.c:88
List * FetchPortalTargetList(Portal portal)
Definition: pquery.c:338
#define SIGCHLD
Definition: win32.h:198
void TimestampDifference(TimestampTz start_time, TimestampTz stop_time, long *secs, int *microsecs)
Definition: timestamp.c:1624
void free_parsestate(ParseState *pstate)
Definition: parse_node.c:77
static bool ignore_till_sync
Definition: postgres.c:144
char * database_name
Definition: libpq-be.h:136
void assign_max_stack_depth(int newval, void *extra)
Definition: postgres.c:3197
PreparedStatement * FetchPreparedStatement(const char *stmt_name, bool throwError)
Definition: prepare.c:494
Definition: pg_list.h:45
bool isnull
Definition: params.h:57
#define STACK_DEPTH_SLOP
Definition: tcopprot.h:31
Datum OidInputFunctionCall(Oid functionId, char *str, Oid typioparam, int32 typmod)
Definition: fmgr.c:1738
int stmt_len
Definition: parsenodes.h:180
List * pg_plan_queries(List *querytrees, int cursorOptions, ParamListInfo boundParams)
Definition: postgres.c:840
void quickdie(SIGNAL_ARGS)
Definition: postgres.c:2556
#define _(x)
Definition: elog.c:84
ProtocolVersion FrontendProtocol
Definition: globals.c:27
MemoryContext PostmasterContext
Definition: mcxt.c:45
long val
Definition: informix.c:689
post_parse_analyze_hook_type post_parse_analyze_hook
Definition: analyze.c:49
bool log_planner_stats
Definition: guc.c:439
#define SIGUSR2
Definition: win32.h:203
#define offsetof(type, field)
Definition: c.h:555
static void exec_simple_query(const char *query_string)
Definition: postgres.c:878
#define PARAM_FLAG_CONST
Definition: params.h:52
const char * prepStmtName
Definition: portal.h:118
LogStmtLevel GetCommandLogLevel(Node *parsetree)
Definition: utility.c:2870
void NullCommand(CommandDest dest)
Definition: dest.c:198
TimestampTz GetCurrentStatementStartTimestamp(void)
Definition: xact.c:717
char * pg_stack_base_t
Definition: miscadmin.h:271
void InitializeGUCOptions(void)
Definition: guc.c:4467
bool stack_is_too_deep(void)
Definition: postgres.c:3131
TransactionStmtKind kind
Definition: parsenodes.h:2918
#define RESUME_CANCEL_INTERRUPTS()
Definition: miscadmin.h:127
void ProcessClientWriteInterrupt(bool blocked)
Definition: postgres.c:554
#define FETCH_ALL
Definition: parsenodes.h:2658
void pgstat_report_stat(bool force)
Definition: pgstat.c:812
void DropPreparedStatement(const char *stmt_name, bool showError)
Definition: prepare.c:579
static void exec_describe_statement_message(const char *stmt_name)
Definition: postgres.c:2290
PlannedStmt * pg_plan_query(Query *querytree, int cursorOptions, ParamListInfo boundParams)
Definition: postgres.c:779