PostgreSQL Source Code  git master
tcopprot.h File Reference
#include "nodes/params.h"
#include "nodes/parsenodes.h"
#include "nodes/plannodes.h"
#include "storage/procsignal.h"
#include "utils/guc.h"
#include "utils/queryenvironment.h"
Include dependency graph for tcopprot.h:
This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Macros

#define STACK_DEPTH_SLOP   (512 * 1024L)
 

Enumerations

enum  LogStmtLevel { LOGSTMT_NONE, LOGSTMT_DDL, LOGSTMT_MOD, LOGSTMT_ALL }
 

Functions

Listpg_parse_query (const char *query_string)
 
Listpg_analyze_and_rewrite (RawStmt *parsetree, const char *query_string, Oid *paramTypes, int numParams, QueryEnvironment *queryEnv)
 
Listpg_analyze_and_rewrite_params (RawStmt *parsetree, const char *query_string, ParserSetupHook parserSetup, void *parserSetupArg, QueryEnvironment *queryEnv)
 
PlannedStmtpg_plan_query (Query *querytree, const char *query_string, int cursorOptions, ParamListInfo boundParams)
 
Listpg_plan_queries (List *querytrees, const char *query_string, int cursorOptions, ParamListInfo boundParams)
 
bool check_max_stack_depth (int *newval, void **extra, GucSource source)
 
void assign_max_stack_depth (int newval, void *extra)
 
void die (SIGNAL_ARGS)
 
void quickdie (SIGNAL_ARGS) pg_attribute_noreturn()
 
void StatementCancelHandler (SIGNAL_ARGS)
 
void FloatExceptionHandler (SIGNAL_ARGS) pg_attribute_noreturn()
 
void RecoveryConflictInterrupt (ProcSignalReason reason)
 
void ProcessClientReadInterrupt (bool blocked)
 
void ProcessClientWriteInterrupt (bool blocked)
 
void process_postgres_switches (int argc, char *argv[], GucContext ctx, const char **dbname)
 
void PostgresMain (int argc, char *argv[], const char *dbname, const char *username) pg_attribute_noreturn()
 
long get_stack_depth_rlimit (void)
 
void ResetUsage (void)
 
void ShowUsage (const char *title)
 
int check_log_duration (char *msec_str, bool was_logged)
 
void set_debug_options (int debug_flag, GucContext context, GucSource source)
 
bool set_plan_disabling_options (const char *arg, GucContext context, GucSource source)
 
const char * get_stats_option_name (const char *arg)
 

Variables

CommandDest whereToSendOutput
 
PGDLLIMPORT const char * debug_query_string
 
int max_stack_depth
 
int PostAuthDelay
 
PGDLLIMPORT int log_statement
 

Macro Definition Documentation

◆ STACK_DEPTH_SLOP

#define STACK_DEPTH_SLOP   (512 * 1024L)

Definition at line 26 of file tcopprot.h.

Referenced by check_max_stack_depth(), and InitializeGUCOptionsFromEnvironment().

Enumeration Type Documentation

◆ LogStmtLevel

Enumerator
LOGSTMT_NONE 
LOGSTMT_DDL 
LOGSTMT_MOD 
LOGSTMT_ALL 

Definition at line 35 of file tcopprot.h.

36 {
37  LOGSTMT_NONE, /* log no statements */
38  LOGSTMT_DDL, /* log data definition statements */
39  LOGSTMT_MOD, /* log modification statements, plus DDL */
40  LOGSTMT_ALL /* log all statements */
41 } LogStmtLevel;
LogStmtLevel
Definition: tcopprot.h:35

Function Documentation

◆ assign_max_stack_depth()

void assign_max_stack_depth ( int  newval,
void *  extra 
)

Definition at line 3375 of file postgres.c.

References max_stack_depth_bytes.

3376 {
3377  long newval_bytes = newval * 1024L;
3378 
3379  max_stack_depth_bytes = newval_bytes;
3380 }
static long max_stack_depth_bytes
Definition: postgres.c:112
#define newval

◆ check_log_duration()

int check_log_duration ( char *  msec_str,
bool  was_logged 
)

Definition at line 2307 of file postgres.c.

References GetCurrentStatementStartTimestamp(), GetCurrentTimestamp(), log_duration, log_min_duration_sample, log_min_duration_statement, log_statement_sample_rate, MAX_RANDOM_VALUE, random(), snprintf, TimestampDifference(), and xact_is_sampled.

Referenced by exec_bind_message(), exec_execute_message(), exec_parse_message(), exec_simple_query(), and HandleFunctionRequest().

2308 {
2309  if (log_duration || log_min_duration_sample >= 0 ||
2311  {
2312  long secs;
2313  int usecs;
2314  int msecs;
2315  bool exceeded_duration;
2316  bool exceeded_sample_duration;
2317  bool in_sample = false;
2318 
2321  &secs, &usecs);
2322  msecs = usecs / 1000;
2323 
2324  /*
2325  * This odd-looking test for log_min_duration_* being exceeded is
2326  * designed to avoid integer overflow with very long durations: don't
2327  * compute secs * 1000 until we've verified it will fit in int.
2328  */
2329  exceeded_duration = (log_min_duration_statement == 0 ||
2331  (secs > log_min_duration_statement / 1000 ||
2332  secs * 1000 + msecs >= log_min_duration_statement)));
2333 
2334  exceeded_sample_duration = (log_min_duration_sample == 0 ||
2335  (log_min_duration_sample > 0 &&
2336  (secs > log_min_duration_sample / 1000 ||
2337  secs * 1000 + msecs >= log_min_duration_sample)));
2338 
2339  /*
2340  * Do not log if log_statement_sample_rate = 0. Log a sample if
2341  * log_statement_sample_rate <= 1 and avoid unnecessary random() call
2342  * if log_statement_sample_rate = 1.
2343  */
2344  if (exceeded_sample_duration)
2345  in_sample = log_statement_sample_rate != 0 &&
2346  (log_statement_sample_rate == 1 ||
2348 
2349  if (exceeded_duration || in_sample || log_duration || xact_is_sampled)
2350  {
2351  snprintf(msec_str, 32, "%ld.%03d",
2352  secs * 1000 + msecs, usecs % 1000);
2353  if ((exceeded_duration || in_sample || xact_is_sampled) && !was_logged)
2354  return 2;
2355  else
2356  return 1;
2357  }
2358  }
2359 
2360  return 0;
2361 }
int log_min_duration_statement
Definition: guc.c:546
double log_statement_sample_rate
Definition: guc.c:548
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1583
long random(void)
Definition: random.c:22
int log_min_duration_sample
Definition: guc.c:545
#define MAX_RANDOM_VALUE
bool xact_is_sampled
Definition: xact.c:267
bool log_duration
Definition: guc.c:517
void TimestampDifference(TimestampTz start_time, TimestampTz stop_time, long *secs, int *microsecs)
Definition: timestamp.c:1657
#define snprintf
Definition: port.h:192
TimestampTz GetCurrentStatementStartTimestamp(void)
Definition: xact.c:791

◆ check_max_stack_depth()

bool check_max_stack_depth ( int *  newval,
void **  extra,
GucSource  source 
)

Definition at line 3358 of file postgres.c.

References get_stack_depth_rlimit(), GUC_check_errdetail, GUC_check_errhint, and STACK_DEPTH_SLOP.

3359 {
3360  long newval_bytes = *newval * 1024L;
3361  long stack_rlimit = get_stack_depth_rlimit();
3362 
3363  if (stack_rlimit > 0 && newval_bytes > stack_rlimit - STACK_DEPTH_SLOP)
3364  {
3365  GUC_check_errdetail("\"max_stack_depth\" must not exceed %ldkB.",
3366  (stack_rlimit - STACK_DEPTH_SLOP) / 1024L);
3367  GUC_check_errhint("Increase the platform's stack depth limit via \"ulimit -s\" or local equivalent.");
3368  return false;
3369  }
3370  return true;
3371 }
#define GUC_check_errdetail
Definition: guc.h:414
long get_stack_depth_rlimit(void)
Definition: postgres.c:4558
#define newval
#define GUC_check_errhint
Definition: guc.h:418
#define STACK_DEPTH_SLOP
Definition: tcopprot.h:26

◆ die()

void die ( SIGNAL_ARGS  )

Definition at line 2809 of file postgres.c.

References DestRemote, DoingCommandRead, InterruptPending, MyLatch, proc_exit_inprogress, ProcDiePending, ProcessInterrupts(), SetLatch(), and whereToSendOutput.

Referenced by PostgresMain().

2810 {
2811  int save_errno = errno;
2812 
2813  /* Don't joggle the elbow of proc_exit */
2814  if (!proc_exit_inprogress)
2815  {
2816  InterruptPending = true;
2817  ProcDiePending = true;
2818  }
2819 
2820  /* If we're still here, waken anything waiting on the process latch */
2821  SetLatch(MyLatch);
2822 
2823  /*
2824  * If we're in single user mode, we want to quit immediately - we can't
2825  * rely on latches as they wouldn't work when stdin/stdout is a file.
2826  * Rather ugly, but it's unlikely to be worthwhile to invest much more
2827  * effort just for the benefit of single user mode.
2828  */
2831 
2832  errno = save_errno;
2833 }
void SetLatch(Latch *latch)
Definition: latch.c:457
void ProcessInterrupts(void)
Definition: postgres.c:3002
volatile sig_atomic_t ProcDiePending
Definition: globals.c:32
bool proc_exit_inprogress
Definition: ipc.c:40
static bool DoingCommandRead
Definition: postgres.c:140
volatile sig_atomic_t InterruptPending
Definition: globals.c:30
struct Latch * MyLatch
Definition: globals.c:54
CommandDest whereToSendOutput
Definition: postgres.c:91

◆ FloatExceptionHandler()

void FloatExceptionHandler ( SIGNAL_ARGS  )

Definition at line 2861 of file postgres.c.

References ereport, errcode(), errdetail(), errmsg(), and ERROR.

Referenced by AutoVacLauncherMain(), AutoVacWorkerMain(), plperl_init_interp(), PostgresMain(), and StartBackgroundWorker().

2862 {
2863  /* We're not returning, so no need to save errno */
2864  ereport(ERROR,
2865  (errcode(ERRCODE_FLOATING_POINT_EXCEPTION),
2866  errmsg("floating-point exception"),
2867  errdetail("An invalid floating-point operation was signaled. "
2868  "This probably means an out-of-range result or an "
2869  "invalid operation, such as division by zero.")));
2870 }
int errcode(int sqlerrcode)
Definition: elog.c:610
#define ERROR
Definition: elog.h:43
int errdetail(const char *fmt,...)
Definition: elog.c:957
#define ereport(elevel,...)
Definition: elog.h:144
int errmsg(const char *fmt,...)
Definition: elog.c:824

◆ get_stack_depth_rlimit()

long get_stack_depth_rlimit ( void  )

Definition at line 4558 of file postgres.c.

References val.

Referenced by check_max_stack_depth(), and InitializeGUCOptionsFromEnvironment().

4559 {
4560 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_STACK)
4561  static long val = 0;
4562 
4563  /* This won't change after process launch, so check just once */
4564  if (val == 0)
4565  {
4566  struct rlimit rlim;
4567 
4568  if (getrlimit(RLIMIT_STACK, &rlim) < 0)
4569  val = -1;
4570  else if (rlim.rlim_cur == RLIM_INFINITY)
4571  val = LONG_MAX;
4572  /* rlim_cur is probably of an unsigned type, so check for overflow */
4573  else if (rlim.rlim_cur >= LONG_MAX)
4574  val = LONG_MAX;
4575  else
4576  val = rlim.rlim_cur;
4577  }
4578  return val;
4579 #else /* no getrlimit */
4580 #if defined(WIN32) || defined(__CYGWIN__)
4581  /* On Windows we set the backend stack size in src/backend/Makefile */
4582  return WIN32_STACK_RLIMIT;
4583 #else /* not windows ... give up */
4584  return -1;
4585 #endif
4586 #endif
4587 }
long val
Definition: informix.c:664

◆ get_stats_option_name()

const char* get_stats_option_name ( const char *  arg)

Definition at line 3461 of file postgres.c.

References optarg.

Referenced by PostmasterMain(), and process_postgres_switches().

3462 {
3463  switch (arg[0])
3464  {
3465  case 'p':
3466  if (optarg[1] == 'a') /* "parser" */
3467  return "log_parser_stats";
3468  else if (optarg[1] == 'l') /* "planner" */
3469  return "log_planner_stats";
3470  break;
3471 
3472  case 'e': /* "executor" */
3473  return "log_executor_stats";
3474  break;
3475  }
3476 
3477  return NULL;
3478 }
char * optarg
Definition: getopt.c:52
void * arg

◆ pg_analyze_and_rewrite()

List* pg_analyze_and_rewrite ( RawStmt parsetree,
const char *  query_string,
Oid paramTypes,
int  numParams,
QueryEnvironment queryEnv 
)

Definition at line 676 of file postgres.c.

References log_parser_stats, parse_analyze(), pg_rewrite_query(), ResetUsage(), and ShowUsage().

Referenced by _SPI_execute_plan(), _SPI_prepare_plan(), BeginCopy(), exec_simple_query(), execute_sql_string(), and RevalidateCachedQuery().

679 {
680  Query *query;
681  List *querytree_list;
682 
683  TRACE_POSTGRESQL_QUERY_REWRITE_START(query_string);
684 
685  /*
686  * (1) Perform parse analysis.
687  */
688  if (log_parser_stats)
689  ResetUsage();
690 
691  query = parse_analyze(parsetree, query_string, paramTypes, numParams,
692  queryEnv);
693 
694  if (log_parser_stats)
695  ShowUsage("PARSE ANALYSIS STATISTICS");
696 
697  /*
698  * (2) Rewrite the queries, as necessary
699  */
700  querytree_list = pg_rewrite_query(query);
701 
702  TRACE_POSTGRESQL_QUERY_REWRITE_DONE(query_string);
703 
704  return querytree_list;
705 }
bool log_parser_stats
Definition: guc.c:524
void ShowUsage(const char *title)
Definition: postgres.c:4601
void ResetUsage(void)
Definition: postgres.c:4594
static List * pg_rewrite_query(Query *query)
Definition: postgres.c:765
Query * parse_analyze(RawStmt *parseTree, const char *sourceText, Oid *paramTypes, int numParams, QueryEnvironment *queryEnv)
Definition: analyze.c:100
Definition: pg_list.h:50

◆ pg_analyze_and_rewrite_params()

List* pg_analyze_and_rewrite_params ( RawStmt parsetree,
const char *  query_string,
ParserSetupHook  parserSetup,
void *  parserSetupArg,
QueryEnvironment queryEnv 
)

Definition at line 713 of file postgres.c.

References Assert, free_parsestate(), log_parser_stats, make_parsestate(), ParseState::p_queryEnv, ParseState::p_sourcetext, pg_rewrite_query(), post_parse_analyze_hook, ResetUsage(), ShowUsage(), and transformTopLevelStmt().

Referenced by _SPI_execute_plan(), _SPI_prepare_plan(), fmgr_sql_validator(), init_sql_fcache(), inline_set_returning_function(), and RevalidateCachedQuery().

718 {
719  ParseState *pstate;
720  Query *query;
721  List *querytree_list;
722 
723  Assert(query_string != NULL); /* required as of 8.4 */
724 
725  TRACE_POSTGRESQL_QUERY_REWRITE_START(query_string);
726 
727  /*
728  * (1) Perform parse analysis.
729  */
730  if (log_parser_stats)
731  ResetUsage();
732 
733  pstate = make_parsestate(NULL);
734  pstate->p_sourcetext = query_string;
735  pstate->p_queryEnv = queryEnv;
736  (*parserSetup) (pstate, parserSetupArg);
737 
738  query = transformTopLevelStmt(pstate, parsetree);
739 
741  (*post_parse_analyze_hook) (pstate, query);
742 
743  free_parsestate(pstate);
744 
745  if (log_parser_stats)
746  ShowUsage("PARSE ANALYSIS STATISTICS");
747 
748  /*
749  * (2) Rewrite the queries, as necessary
750  */
751  querytree_list = pg_rewrite_query(query);
752 
753  TRACE_POSTGRESQL_QUERY_REWRITE_DONE(query_string);
754 
755  return querytree_list;
756 }
bool log_parser_stats
Definition: guc.c:524
QueryEnvironment * p_queryEnv
Definition: parse_node.h:203
void ShowUsage(const char *title)
Definition: postgres.c:4601
ParseState * make_parsestate(ParseState *parentParseState)
Definition: parse_node.c:43
void ResetUsage(void)
Definition: postgres.c:4594
const char * p_sourcetext
Definition: parse_node.h:179
static List * pg_rewrite_query(Query *query)
Definition: postgres.c:765
#define Assert(condition)
Definition: c.h:738
Query * transformTopLevelStmt(ParseState *pstate, RawStmt *parseTree)
Definition: analyze.c:191
void free_parsestate(ParseState *pstate)
Definition: parse_node.c:76
Definition: pg_list.h:50
post_parse_analyze_hook_type post_parse_analyze_hook
Definition: analyze.c:51

◆ pg_parse_query()

List* pg_parse_query ( const char *  query_string)

Definition at line 628 of file postgres.c.

References copyObject, elog, equal(), log_parser_stats, new_list(), raw_parser(), ResetUsage(), ShowUsage(), and WARNING.

Referenced by _SPI_prepare_oneshot_plan(), _SPI_prepare_plan(), exec_parse_message(), exec_simple_query(), execute_sql_string(), fmgr_sql_validator(), ImportForeignSchema(), init_sql_fcache(), inline_function(), and inline_set_returning_function().

629 {
630  List *raw_parsetree_list;
631 
632  TRACE_POSTGRESQL_QUERY_PARSE_START(query_string);
633 
634  if (log_parser_stats)
635  ResetUsage();
636 
637  raw_parsetree_list = raw_parser(query_string);
638 
639  if (log_parser_stats)
640  ShowUsage("PARSER STATISTICS");
641 
642 #ifdef COPY_PARSE_PLAN_TREES
643  /* Optional debugging check: pass raw parsetrees through copyObject() */
644  {
645  List *new_list = copyObject(raw_parsetree_list);
646 
647  /* This checks both copyObject() and the equal() routines... */
648  if (!equal(new_list, raw_parsetree_list))
649  elog(WARNING, "copyObject() failed to produce an equal raw parse tree");
650  else
651  raw_parsetree_list = new_list;
652  }
653 #endif
654 
655  /*
656  * Currently, outfuncs/readfuncs support is missing for many raw parse
657  * tree nodes, so we don't try to implement WRITE_READ_PARSE_PLAN_TREES
658  * here.
659  */
660 
661  TRACE_POSTGRESQL_QUERY_PARSE_DONE(query_string);
662 
663  return raw_parsetree_list;
664 }
List * raw_parser(const char *str)
Definition: parser.c:42
bool log_parser_stats
Definition: guc.c:524
bool equal(const void *a, const void *b)
Definition: equalfuncs.c:3028
void ShowUsage(const char *title)
Definition: postgres.c:4601
void ResetUsage(void)
Definition: postgres.c:4594
#define WARNING
Definition: elog.h:40
#define elog(elevel,...)
Definition: elog.h:214
#define copyObject(obj)
Definition: nodes.h:642
Definition: pg_list.h:50
static List * new_list(NodeTag type, int min_size)
Definition: list.c:87

◆ pg_plan_queries()

List* pg_plan_queries ( List querytrees,
const char *  query_string,
int  cursorOptions,
ParamListInfo  boundParams 
)

Definition at line 943 of file postgres.c.

References PlannedStmt::canSetTag, Query::canSetTag, CMD_UTILITY, PlannedStmt::commandType, Query::commandType, lappend(), lfirst_node, makeNode, NIL, pg_plan_query(), PlannedStmt::stmt_len, Query::stmt_len, PlannedStmt::stmt_location, Query::stmt_location, PlannedStmt::utilityStmt, and Query::utilityStmt.

Referenced by BuildCachedPlan(), exec_simple_query(), and execute_sql_string().

945 {
946  List *stmt_list = NIL;
947  ListCell *query_list;
948 
949  foreach(query_list, querytrees)
950  {
951  Query *query = lfirst_node(Query, query_list);
952  PlannedStmt *stmt;
953 
954  if (query->commandType == CMD_UTILITY)
955  {
956  /* Utility commands require no planning. */
957  stmt = makeNode(PlannedStmt);
958  stmt->commandType = CMD_UTILITY;
959  stmt->canSetTag = query->canSetTag;
960  stmt->utilityStmt = query->utilityStmt;
961  stmt->stmt_location = query->stmt_location;
962  stmt->stmt_len = query->stmt_len;
963  }
964  else
965  {
966  stmt = pg_plan_query(query, query_string, cursorOptions,
967  boundParams);
968  }
969 
970  stmt_list = lappend(stmt_list, stmt);
971  }
972 
973  return stmt_list;
974 }
#define NIL
Definition: pg_list.h:65
int stmt_location
Definition: parsenodes.h:180
Node * utilityStmt
Definition: parsenodes.h:120
int stmt_len
Definition: plannodes.h:96
#define lfirst_node(type, lc)
Definition: pg_list.h:193
int stmt_location
Definition: plannodes.h:95
Node * utilityStmt
Definition: plannodes.h:92
List * lappend(List *list, void *datum)
Definition: list.c:322
bool canSetTag
Definition: plannodes.h:54
CmdType commandType
Definition: plannodes.h:46
CmdType commandType
Definition: parsenodes.h:112
#define makeNode(_type_)
Definition: nodes.h:574
bool canSetTag
Definition: parsenodes.h:118
PlannedStmt * pg_plan_query(Query *querytree, const char *query_string, int cursorOptions, ParamListInfo boundParams)
Definition: postgres.c:857
Definition: pg_list.h:50
int stmt_len
Definition: parsenodes.h:181

◆ pg_plan_query()

PlannedStmt* pg_plan_query ( Query querytree,
const char *  query_string,
int  cursorOptions,
ParamListInfo  boundParams 
)

Definition at line 857 of file postgres.c.

References ActiveSnapshotSet(), Assert, CMD_UTILITY, Query::commandType, copyObject, Debug_pretty_print, Debug_print_plan, elog, elog_node_display(), equal(), LOG, log_planner_stats, nodeToString(), pfree(), planner(), ResetUsage(), ShowUsage(), generate_unaccent_rules::str, and WARNING.

Referenced by BeginCopy(), ExecCreateTableAs(), ExplainOneQuery(), init_execution_state(), PerformCursorOpen(), pg_plan_queries(), and refresh_matview_datafill().

859 {
860  PlannedStmt *plan;
861 
862  /* Utility commands have no plans. */
863  if (querytree->commandType == CMD_UTILITY)
864  return NULL;
865 
866  /* Planner must have a snapshot in case it calls user-defined functions. */
868 
869  TRACE_POSTGRESQL_QUERY_PLAN_START();
870 
871  if (log_planner_stats)
872  ResetUsage();
873 
874  /* call the optimizer */
875  plan = planner(querytree, query_string, cursorOptions, boundParams);
876 
877  if (log_planner_stats)
878  ShowUsage("PLANNER STATISTICS");
879 
880 #ifdef COPY_PARSE_PLAN_TREES
881  /* Optional debugging check: pass plan tree through copyObject() */
882  {
883  PlannedStmt *new_plan = copyObject(plan);
884 
885  /*
886  * equal() currently does not have routines to compare Plan nodes, so
887  * don't try to test equality here. Perhaps fix someday?
888  */
889 #ifdef NOT_USED
890  /* This checks both copyObject() and the equal() routines... */
891  if (!equal(new_plan, plan))
892  elog(WARNING, "copyObject() failed to produce an equal plan tree");
893  else
894 #endif
895  plan = new_plan;
896  }
897 #endif
898 
899 #ifdef WRITE_READ_PARSE_PLAN_TREES
900  /* Optional debugging check: pass plan tree through outfuncs/readfuncs */
901  {
902  char *str;
903  PlannedStmt *new_plan;
904 
905  str = nodeToString(plan);
906  new_plan = stringToNodeWithLocations(str);
907  pfree(str);
908 
909  /*
910  * equal() currently does not have routines to compare Plan nodes, so
911  * don't try to test equality here. Perhaps fix someday?
912  */
913 #ifdef NOT_USED
914  /* This checks both outfuncs/readfuncs and the equal() routines... */
915  if (!equal(new_plan, plan))
916  elog(WARNING, "outfuncs/readfuncs failed to produce an equal plan tree");
917  else
918 #endif
919  plan = new_plan;
920  }
921 #endif
922 
923  /*
924  * Print plan if debugging.
925  */
926  if (Debug_print_plan)
927  elog_node_display(LOG, "plan", plan, Debug_pretty_print);
928 
929  TRACE_POSTGRESQL_QUERY_PLAN_DONE();
930 
931  return plan;
932 }
void elog_node_display(int lev, const char *title, const void *obj, bool pretty)
Definition: print.c:72
bool equal(const void *a, const void *b)
Definition: equalfuncs.c:3028
void ShowUsage(const char *title)
Definition: postgres.c:4601
#define LOG
Definition: elog.h:26
void ResetUsage(void)
Definition: postgres.c:4594
bool Debug_print_plan
Definition: guc.c:519
void pfree(void *pointer)
Definition: mcxt.c:1056
bool ActiveSnapshotSet(void)
Definition: snapmgr.c:853
#define WARNING
Definition: elog.h:40
PlannedStmt * planner(Query *parse, const char *query_string, int cursorOptions, ParamListInfo boundParams)
Definition: planner.c:267
CmdType commandType
Definition: parsenodes.h:112
#define Assert(condition)
Definition: c.h:738
#define elog(elevel,...)
Definition: elog.h:214
bool Debug_pretty_print
Definition: guc.c:522
char * nodeToString(const void *obj)
Definition: outfuncs.c:4329
#define copyObject(obj)
Definition: nodes.h:642
bool log_planner_stats
Definition: guc.c:525

◆ PostgresMain()

void PostgresMain ( int  argc,
char *  argv[],
const char *  dbname,
const char *  username 
)

Definition at line 3760 of file postgres.c.

References AbortCurrentTransaction(), ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate, am_walsender, BaseInit(), BeginReportingGUCOptions(), BlockSig, buf, ChangeToDataDir(), CHECK_FOR_INTERRUPTS, checkDataDir(), ConfigReloadPending, CreateDataDirLockFile(), debug_query_string, DestDebug, DestNone, DestRemote, die(), disable_all_timeouts(), disable_timeout(), doing_extended_query_message, DoingCommandRead, drop_unnamed_stmt(), DropPreparedStatement(), EmitErrorReport(), enable_timeout_after(), ereport, errcode(), errmsg(), ERROR, error_context_stack, exec_bind_message(), exec_describe_portal_message(), exec_describe_statement_message(), exec_execute_message(), exec_parse_message(), exec_replication_command(), exec_simple_query(), FATAL, finish_xact_command(), FloatExceptionHandler(), FlushErrorState(), forbidden_in_wal_sender(), GetCurrentTimestamp(), GetPortalByName(), HandleFunctionRequest(), HOLD_INTERRUPTS, i, IDLE_IN_TRANSACTION_SESSION_TIMEOUT, IdleInTransactionSessionTimeout, ignore_till_sync, InitializeGUCOptions(), InitializeMaxBackends(), InitializeTimeouts(), InitPostgres(), InitProcess(), InitProcessing, InitStandaloneProcess(), initStringInfo(), InitWalSender(), InvalidateCatalogSnapshotConditionally(), InvalidOid, IsAbortedTransactionBlockState(), IsTransactionOrTransactionBlock(), IsUnderPostmaster, jit_reset_after_error(), LocalProcessControlFile(), Log_disconnections, log_disconnections(), MemoryContextDelete(), MemoryContextResetAndDeleteChildren, MemoryContextSwitchTo(), MessageContext, MyCancelKey, MyProcPid, MyReplicationSlot, NormalProcessing, notifyInterruptPending, on_proc_exit(), palloc(), PG_exception_stack, PG_SETMASK, PGC_POSTMASTER, PGC_SIGHUP, PgStartTime, pgstat_report_activity(), pgstat_report_stat(), PortalDrop(), PortalErrorCleanup(), PortalIsValid, PostmasterContext, pq_beginmessage(), pq_comm_reset, pq_endmessage(), pq_flush, pq_getmsgbyte(), pq_getmsgend(), pq_getmsgint(), pq_getmsgstring(), pq_is_reading_msg(), pq_putemptymessage(), pq_sendint32(), pqinitmask(), pqsignal(), printf, proc_exit(), process_postgres_switches(), process_session_preload_libraries(), ProcessCompletedNotifies(), ProcessConfigFile(), ProcessNotifyInterrupt(), procsignal_sigusr1_handler(), progname, QueryCancelPending, quickdie(), ReadCommand(), ReadyForQuery(), ReplicationSlotCleanup(), ReplicationSlotRelease(), RESUME_INTERRUPTS, SelectConfigFiles(), set_ps_display(), SetCurrentStatementStartTimestamp(), SetProcessingMode, SIG_DFL, SIG_IGN, SIGCHLD, SIGHUP, SignalHandlerForConfigReload(), SIGPIPE, SIGQUIT, SIGUSR1, SIGUSR2, SPICleanup(), start_xact_command(), STATE_FASTPATH, STATE_IDLE, STATE_IDLEINTRANSACTION, STATE_IDLEINTRANSACTION_ABORTED, StatementCancelHandler(), TopMemoryContext, UnBlockSig, userDoption, username, WalSndErrorCleanup(), WalSndSignals(), whereToSendOutput, and xact_started.

Referenced by BackendRun(), and main().

3763 {
3764  int firstchar;
3765  StringInfoData input_message;
3766  sigjmp_buf local_sigjmp_buf;
3767  volatile bool send_ready_for_query = true;
3768  bool disable_idle_in_transaction_timeout = false;
3769 
3770  /* Initialize startup process environment if necessary. */
3771  if (!IsUnderPostmaster)
3772  InitStandaloneProcess(argv[0]);
3773 
3775 
3776  /*
3777  * Set default values for command-line options.
3778  */
3779  if (!IsUnderPostmaster)
3781 
3782  /*
3783  * Parse command-line options.
3784  */
3786 
3787  /* Must have gotten a database name, or have a default (the username) */
3788  if (dbname == NULL)
3789  {
3790  dbname = username;
3791  if (dbname == NULL)
3792  ereport(FATAL,
3793  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3794  errmsg("%s: no database nor user name specified",
3795  progname)));
3796  }
3797 
3798  /* Acquire configuration parameters, unless inherited from postmaster */
3799  if (!IsUnderPostmaster)
3800  {
3802  proc_exit(1);
3803  }
3804 
3805  /*
3806  * Set up signal handlers and masks.
3807  *
3808  * Note that postmaster blocked all signals before forking child process,
3809  * so there is no race condition whereby we might receive a signal before
3810  * we have set up the handler.
3811  *
3812  * Also note: it's best not to use any signals that are SIG_IGNored in the
3813  * postmaster. If such a signal arrives before we are able to change the
3814  * handler to non-SIG_IGN, it'll get dropped. Instead, make a dummy
3815  * handler in the postmaster to reserve the signal. (Of course, this isn't
3816  * an issue for signals that are locally generated, such as SIGALRM and
3817  * SIGPIPE.)
3818  */
3819  if (am_walsender)
3820  WalSndSignals();
3821  else
3822  {
3824  pqsignal(SIGINT, StatementCancelHandler); /* cancel current query */
3825  pqsignal(SIGTERM, die); /* cancel current query and exit */
3826 
3827  /*
3828  * In a standalone backend, SIGQUIT can be generated from the keyboard
3829  * easily, while SIGTERM cannot, so we make both signals do die()
3830  * rather than quickdie().
3831  */
3832  if (IsUnderPostmaster)
3833  pqsignal(SIGQUIT, quickdie); /* hard crash time */
3834  else
3835  pqsignal(SIGQUIT, die); /* cancel current query and exit */
3836  InitializeTimeouts(); /* establishes SIGALRM handler */
3837 
3838  /*
3839  * Ignore failure to write to frontend. Note: if frontend closes
3840  * connection, we will notice it and exit cleanly when control next
3841  * returns to outer loop. This seems safer than forcing exit in the
3842  * midst of output during who-knows-what operation...
3843  */
3848 
3849  /*
3850  * Reset some signals that are accepted by postmaster but not by
3851  * backend
3852  */
3853  pqsignal(SIGCHLD, SIG_DFL); /* system() requires this on some
3854  * platforms */
3855  }
3856 
3857  pqinitmask();
3858 
3859  if (IsUnderPostmaster)
3860  {
3861  /* We allow SIGQUIT (quickdie) at all times */
3862  sigdelset(&BlockSig, SIGQUIT);
3863  }
3864 
3865  PG_SETMASK(&BlockSig); /* block everything except SIGQUIT */
3866 
3867  if (!IsUnderPostmaster)
3868  {
3869  /*
3870  * Validate we have been given a reasonable-looking DataDir (if under
3871  * postmaster, assume postmaster did this already).
3872  */
3873  checkDataDir();
3874 
3875  /* Change into DataDir (if under postmaster, was done already) */
3876  ChangeToDataDir();
3877 
3878  /*
3879  * Create lockfile for data directory.
3880  */
3881  CreateDataDirLockFile(false);
3882 
3883  /* read control file (error checking and contains config ) */
3884  LocalProcessControlFile(false);
3885 
3886  /* Initialize MaxBackends (if under postmaster, was done already) */
3888  }
3889 
3890  /* Early initialization */
3891  BaseInit();
3892 
3893  /*
3894  * Create a per-backend PGPROC struct in shared memory, except in the
3895  * EXEC_BACKEND case where this was done in SubPostmasterMain. We must do
3896  * this before we can use LWLocks (and in the EXEC_BACKEND case we already
3897  * had to do some stuff with LWLocks).
3898  */
3899 #ifdef EXEC_BACKEND
3900  if (!IsUnderPostmaster)
3901  InitProcess();
3902 #else
3903  InitProcess();
3904 #endif
3905 
3906  /* We need to allow SIGINT, etc during the initial transaction */
3908 
3909  /*
3910  * General initialization.
3911  *
3912  * NOTE: if you are tempted to add code in this vicinity, consider putting
3913  * it inside InitPostgres() instead. In particular, anything that
3914  * involves database access should be there, not here.
3915  */
3917 
3918  /*
3919  * If the PostmasterContext is still around, recycle the space; we don't
3920  * need it anymore after InitPostgres completes. Note this does not trash
3921  * *MyProcPort, because ConnCreate() allocated that space with malloc()
3922  * ... else we'd need to copy the Port data first. Also, subsidiary data
3923  * such as the username isn't lost either; see ProcessStartupPacket().
3924  */
3925  if (PostmasterContext)
3926  {
3928  PostmasterContext = NULL;
3929  }
3930 
3932 
3933  /*
3934  * Now all GUC states are fully set up. Report them to client if
3935  * appropriate.
3936  */
3938 
3939  /*
3940  * Also set up handler to log session end; we have to wait till now to be
3941  * sure Log_disconnections has its final value.
3942  */
3945 
3946  /* Perform initialization specific to a WAL sender process. */
3947  if (am_walsender)
3948  InitWalSender();
3949 
3950  /*
3951  * process any libraries that should be preloaded at backend start (this
3952  * likewise can't be done until GUC settings are complete)
3953  */
3955 
3956  /*
3957  * Send this backend's cancellation info to the frontend.
3958  */
3960  {
3962 
3963  pq_beginmessage(&buf, 'K');
3964  pq_sendint32(&buf, (int32) MyProcPid);
3965  pq_sendint32(&buf, (int32) MyCancelKey);
3966  pq_endmessage(&buf);
3967  /* Need not flush since ReadyForQuery will do it. */
3968  }
3969 
3970  /* Welcome banner for standalone case */
3972  printf("\nPostgreSQL stand-alone backend %s\n", PG_VERSION);
3973 
3974  /*
3975  * Create the memory context we will use in the main loop.
3976  *
3977  * MessageContext is reset once per iteration of the main loop, ie, upon
3978  * completion of processing of each command message from the client.
3979  */
3981  "MessageContext",
3983 
3984  /*
3985  * Create memory context and buffer used for RowDescription messages. As
3986  * SendRowDescriptionMessage(), via exec_describe_statement_message(), is
3987  * frequently executed for ever single statement, we don't want to
3988  * allocate a separate buffer every time.
3989  */
3991  "RowDescriptionContext",
3996 
3997  /*
3998  * Remember stand-alone backend startup time
3999  */
4000  if (!IsUnderPostmaster)
4002 
4003  /*
4004  * POSTGRES main processing loop begins here
4005  *
4006  * If an exception is encountered, processing resumes here so we abort the
4007  * current transaction and start a new one.
4008  *
4009  * You might wonder why this isn't coded as an infinite loop around a
4010  * PG_TRY construct. The reason is that this is the bottom of the
4011  * exception stack, and so with PG_TRY there would be no exception handler
4012  * in force at all during the CATCH part. By leaving the outermost setjmp
4013  * always active, we have at least some chance of recovering from an error
4014  * during error recovery. (If we get into an infinite loop thereby, it
4015  * will soon be stopped by overflow of elog.c's internal state stack.)
4016  *
4017  * Note that we use sigsetjmp(..., 1), so that this function's signal mask
4018  * (to wit, UnBlockSig) will be restored when longjmp'ing to here. This
4019  * is essential in case we longjmp'd out of a signal handler on a platform
4020  * where that leaves the signal blocked. It's not redundant with the
4021  * unblock in AbortTransaction() because the latter is only called if we
4022  * were inside a transaction.
4023  */
4024 
4025  if (sigsetjmp(local_sigjmp_buf, 1) != 0)
4026  {
4027  /*
4028  * NOTE: if you are tempted to add more code in this if-block,
4029  * consider the high probability that it should be in
4030  * AbortTransaction() instead. The only stuff done directly here
4031  * should be stuff that is guaranteed to apply *only* for outer-level
4032  * error recovery, such as adjusting the FE/BE protocol status.
4033  */
4034 
4035  /* Since not using PG_TRY, must reset error stack by hand */
4036  error_context_stack = NULL;
4037 
4038  /* Prevent interrupts while cleaning up */
4039  HOLD_INTERRUPTS();
4040 
4041  /*
4042  * Forget any pending QueryCancel request, since we're returning to
4043  * the idle loop anyway, and cancel any active timeout requests. (In
4044  * future we might want to allow some timeout requests to survive, but
4045  * at minimum it'd be necessary to do reschedule_timeouts(), in case
4046  * we got here because of a query cancel interrupting the SIGALRM
4047  * interrupt handler.) Note in particular that we must clear the
4048  * statement and lock timeout indicators, to prevent any future plain
4049  * query cancels from being misreported as timeouts in case we're
4050  * forgetting a timeout cancel.
4051  */
4052  disable_all_timeouts(false);
4053  QueryCancelPending = false; /* second to avoid race condition */
4054 
4055  /* Not reading from the client anymore. */
4056  DoingCommandRead = false;
4057 
4058  /* Make sure libpq is in a good state */
4059  pq_comm_reset();
4060 
4061  /* Report the error to the client and/or server log */
4062  EmitErrorReport();
4063 
4064  /*
4065  * Make sure debug_query_string gets reset before we possibly clobber
4066  * the storage it points at.
4067  */
4068  debug_query_string = NULL;
4069 
4070  /*
4071  * Abort the current transaction in order to recover.
4072  */
4074 
4075  if (am_walsender)
4077 
4079  SPICleanup();
4080 
4081  /*
4082  * We can't release replication slots inside AbortTransaction() as we
4083  * need to be able to start and abort transactions while having a slot
4084  * acquired. But we never need to hold them across top level errors,
4085  * so releasing here is fine. There's another cleanup in ProcKill()
4086  * ensuring we'll correctly cleanup on FATAL errors as well.
4087  */
4088  if (MyReplicationSlot != NULL)
4090 
4091  /* We also want to cleanup temporary slots on error. */
4093 
4095 
4096  /*
4097  * Now return to normal top-level context and clear ErrorContext for
4098  * next time.
4099  */
4101  FlushErrorState();
4102 
4103  /*
4104  * If we were handling an extended-query-protocol message, initiate
4105  * skip till next Sync. This also causes us not to issue
4106  * ReadyForQuery (until we get Sync).
4107  */
4109  ignore_till_sync = true;
4110 
4111  /* We don't have a transaction command open anymore */
4112  xact_started = false;
4113 
4114  /*
4115  * If an error occurred while we were reading a message from the
4116  * client, we have potentially lost track of where the previous
4117  * message ends and the next one begins. Even though we have
4118  * otherwise recovered from the error, we cannot safely read any more
4119  * messages from the client, so there isn't much we can do with the
4120  * connection anymore.
4121  */
4122  if (pq_is_reading_msg())
4123  ereport(FATAL,
4124  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4125  errmsg("terminating connection because protocol synchronization was lost")));
4126 
4127  /* Now we can allow interrupts again */
4129  }
4130 
4131  /* We can now handle ereport(ERROR) */
4132  PG_exception_stack = &local_sigjmp_buf;
4133 
4134  if (!ignore_till_sync)
4135  send_ready_for_query = true; /* initially, or after error */
4136 
4137  /*
4138  * Non-error queries loop here.
4139  */
4140 
4141  for (;;)
4142  {
4143  /*
4144  * At top of loop, reset extended-query-message flag, so that any
4145  * errors encountered in "idle" state don't provoke skip.
4146  */
4148 
4149  /*
4150  * Release storage left over from prior query cycle, and create a new
4151  * query input buffer in the cleared MessageContext.
4152  */
4155 
4156  initStringInfo(&input_message);
4157 
4158  /*
4159  * Also consider releasing our catalog snapshot if any, so that it's
4160  * not preventing advance of global xmin while we wait for the client.
4161  */
4163 
4164  /*
4165  * (1) If we've reached idle state, tell the frontend we're ready for
4166  * a new query.
4167  *
4168  * Note: this includes fflush()'ing the last of the prior output.
4169  *
4170  * This is also a good time to send collected statistics to the
4171  * collector, and to update the PS stats display. We avoid doing
4172  * those every time through the message loop because it'd slow down
4173  * processing of batched messages, and because we don't want to report
4174  * uncommitted updates (that confuses autovacuum). The notification
4175  * processor wants a call too, if we are not in a transaction block.
4176  */
4177  if (send_ready_for_query)
4178  {
4180  {
4181  set_ps_display("idle in transaction (aborted)");
4183 
4184  /* Start the idle-in-transaction timer */
4186  {
4187  disable_idle_in_transaction_timeout = true;
4190  }
4191  }
4193  {
4194  set_ps_display("idle in transaction");
4196 
4197  /* Start the idle-in-transaction timer */
4199  {
4200  disable_idle_in_transaction_timeout = true;
4203  }
4204  }
4205  else
4206  {
4207  /* Send out notify signals and transmit self-notifies */
4209 
4210  /*
4211  * Also process incoming notifies, if any. This is mostly to
4212  * ensure stable behavior in tests: if any notifies were
4213  * received during the just-finished transaction, they'll be
4214  * seen by the client before ReadyForQuery is.
4215  */
4218 
4219  pgstat_report_stat(false);
4220 
4221  set_ps_display("idle");
4223  }
4224 
4226  send_ready_for_query = false;
4227  }
4228 
4229  /*
4230  * (2) Allow asynchronous signals to be executed immediately if they
4231  * come in while we are waiting for client input. (This must be
4232  * conditional since we don't want, say, reads on behalf of COPY FROM
4233  * STDIN doing the same thing.)
4234  */
4235  DoingCommandRead = true;
4236 
4237  /*
4238  * (3) read a command (loop blocks here)
4239  */
4240  firstchar = ReadCommand(&input_message);
4241 
4242  /*
4243  * (4) disable async signal conditions again.
4244  *
4245  * Query cancel is supposed to be a no-op when there is no query in
4246  * progress, so if a query cancel arrived while we were idle, just
4247  * reset QueryCancelPending. ProcessInterrupts() has that effect when
4248  * it's called when DoingCommandRead is set, so check for interrupts
4249  * before resetting DoingCommandRead.
4250  */
4252  DoingCommandRead = false;
4253 
4254  /*
4255  * (5) turn off the idle-in-transaction timeout
4256  */
4257  if (disable_idle_in_transaction_timeout)
4258  {
4260  disable_idle_in_transaction_timeout = false;
4261  }
4262 
4263  /*
4264  * (6) check for any other interesting events that happened while we
4265  * slept.
4266  */
4267  if (ConfigReloadPending)
4268  {
4269  ConfigReloadPending = false;
4271  }
4272 
4273  /*
4274  * (7) process the command. But ignore it if we're skipping till
4275  * Sync.
4276  */
4277  if (ignore_till_sync && firstchar != EOF)
4278  continue;
4279 
4280  switch (firstchar)
4281  {
4282  case 'Q': /* simple query */
4283  {
4284  const char *query_string;
4285 
4286  /* Set statement_timestamp() */
4288 
4289  query_string = pq_getmsgstring(&input_message);
4290  pq_getmsgend(&input_message);
4291 
4292  if (am_walsender)
4293  {
4294  if (!exec_replication_command(query_string))
4295  exec_simple_query(query_string);
4296  }
4297  else
4298  exec_simple_query(query_string);
4299 
4300  send_ready_for_query = true;
4301  }
4302  break;
4303 
4304  case 'P': /* parse */
4305  {
4306  const char *stmt_name;
4307  const char *query_string;
4308  int numParams;
4309  Oid *paramTypes = NULL;
4310 
4311  forbidden_in_wal_sender(firstchar);
4312 
4313  /* Set statement_timestamp() */
4315 
4316  stmt_name = pq_getmsgstring(&input_message);
4317  query_string = pq_getmsgstring(&input_message);
4318  numParams = pq_getmsgint(&input_message, 2);
4319  if (numParams > 0)
4320  {
4321  paramTypes = (Oid *) palloc(numParams * sizeof(Oid));
4322  for (int i = 0; i < numParams; i++)
4323  paramTypes[i] = pq_getmsgint(&input_message, 4);
4324  }
4325  pq_getmsgend(&input_message);
4326 
4327  exec_parse_message(query_string, stmt_name,
4328  paramTypes, numParams);
4329  }
4330  break;
4331 
4332  case 'B': /* bind */
4333  forbidden_in_wal_sender(firstchar);
4334 
4335  /* Set statement_timestamp() */
4337 
4338  /*
4339  * this message is complex enough that it seems best to put
4340  * the field extraction out-of-line
4341  */
4342  exec_bind_message(&input_message);
4343  break;
4344 
4345  case 'E': /* execute */
4346  {
4347  const char *portal_name;
4348  int max_rows;
4349 
4350  forbidden_in_wal_sender(firstchar);
4351 
4352  /* Set statement_timestamp() */
4354 
4355  portal_name = pq_getmsgstring(&input_message);
4356  max_rows = pq_getmsgint(&input_message, 4);
4357  pq_getmsgend(&input_message);
4358 
4359  exec_execute_message(portal_name, max_rows);
4360  }
4361  break;
4362 
4363  case 'F': /* fastpath function call */
4364  forbidden_in_wal_sender(firstchar);
4365 
4366  /* Set statement_timestamp() */
4368 
4369  /* Report query to various monitoring facilities. */
4371  set_ps_display("<FASTPATH>");
4372 
4373  /* start an xact for this function invocation */
4375 
4376  /*
4377  * Note: we may at this point be inside an aborted
4378  * transaction. We can't throw error for that until we've
4379  * finished reading the function-call message, so
4380  * HandleFunctionRequest() must check for it after doing so.
4381  * Be careful not to do anything that assumes we're inside a
4382  * valid transaction here.
4383  */
4384 
4385  /* switch back to message context */
4387 
4388  HandleFunctionRequest(&input_message);
4389 
4390  /* commit the function-invocation transaction */
4392 
4393  send_ready_for_query = true;
4394  break;
4395 
4396  case 'C': /* close */
4397  {
4398  int close_type;
4399  const char *close_target;
4400 
4401  forbidden_in_wal_sender(firstchar);
4402 
4403  close_type = pq_getmsgbyte(&input_message);
4404  close_target = pq_getmsgstring(&input_message);
4405  pq_getmsgend(&input_message);
4406 
4407  switch (close_type)
4408  {
4409  case 'S':
4410  if (close_target[0] != '\0')
4411  DropPreparedStatement(close_target, false);
4412  else
4413  {
4414  /* special-case the unnamed statement */
4416  }
4417  break;
4418  case 'P':
4419  {
4420  Portal portal;
4421 
4422  portal = GetPortalByName(close_target);
4423  if (PortalIsValid(portal))
4424  PortalDrop(portal, false);
4425  }
4426  break;
4427  default:
4428  ereport(ERROR,
4429  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4430  errmsg("invalid CLOSE message subtype %d",
4431  close_type)));
4432  break;
4433  }
4434 
4436  pq_putemptymessage('3'); /* CloseComplete */
4437  }
4438  break;
4439 
4440  case 'D': /* describe */
4441  {
4442  int describe_type;
4443  const char *describe_target;
4444 
4445  forbidden_in_wal_sender(firstchar);
4446 
4447  /* Set statement_timestamp() (needed for xact) */
4449 
4450  describe_type = pq_getmsgbyte(&input_message);
4451  describe_target = pq_getmsgstring(&input_message);
4452  pq_getmsgend(&input_message);
4453 
4454  switch (describe_type)
4455  {
4456  case 'S':
4457  exec_describe_statement_message(describe_target);
4458  break;
4459  case 'P':
4460  exec_describe_portal_message(describe_target);
4461  break;
4462  default:
4463  ereport(ERROR,
4464  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4465  errmsg("invalid DESCRIBE message subtype %d",
4466  describe_type)));
4467  break;
4468  }
4469  }
4470  break;
4471 
4472  case 'H': /* flush */
4473  pq_getmsgend(&input_message);
4475  pq_flush();
4476  break;
4477 
4478  case 'S': /* sync */
4479  pq_getmsgend(&input_message);
4481  send_ready_for_query = true;
4482  break;
4483 
4484  /*
4485  * 'X' means that the frontend is closing down the socket. EOF
4486  * means unexpected loss of frontend connection. Either way,
4487  * perform normal shutdown.
4488  */
4489  case 'X':
4490  case EOF:
4491 
4492  /*
4493  * Reset whereToSendOutput to prevent ereport from attempting
4494  * to send any more messages to client.
4495  */
4498 
4499  /*
4500  * NOTE: if you are tempted to add more code here, DON'T!
4501  * Whatever you had in mind to do should be set up as an
4502  * on_proc_exit or on_shmem_exit callback, instead. Otherwise
4503  * it will fail to be called during other backend-shutdown
4504  * scenarios.
4505  */
4506  proc_exit(0);
4507 
4508  case 'd': /* copy data */
4509  case 'c': /* copy done */
4510  case 'f': /* copy fail */
4511 
4512  /*
4513  * Accept but ignore these messages, per protocol spec; we
4514  * probably got here because a COPY failed, and the frontend
4515  * is still sending data.
4516  */
4517  break;
4518 
4519  default:
4520  ereport(FATAL,
4521  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4522  errmsg("invalid frontend message type %d",
4523  firstchar)));
4524  }
4525  } /* end of input-reading loop */
4526 }
void InitializeTimeouts(void)
Definition: timeout.c:346
void AbortCurrentTransaction(void)
Definition: xact.c:3162
static void exec_describe_portal_message(const char *portal_name)
Definition: postgres.c:2566
#define SIGQUIT
Definition: win32_port.h:154
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:211
#define AllocSetContextCreate
Definition: memutils.h:170
volatile sig_atomic_t QueryCancelPending
Definition: globals.c:31
void BeginReportingGUCOptions(void)
Definition: guc.c:6182
int MyProcPid
Definition: globals.c:40
#define pq_flush()
Definition: libpq.h:39
static int ReadCommand(StringInfo inBuf)
Definition: postgres.c:505
static void finish_xact_command(void)
Definition: postgres.c:2638
void ProcessConfigFile(GucContext context)
bool exec_replication_command(const char *cmd_string)
Definition: walsender.c:1466
#define SIGUSR1
Definition: win32_port.h:165
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1583
void on_proc_exit(pg_on_exit_callback function, Datum arg)
Definition: ipc.c:305
void pgstat_report_activity(BackendState state, const char *cmd_str)
Definition: pgstat.c:3062
#define SIGCHLD
Definition: win32_port.h:163
const char * pq_getmsgstring(StringInfo msg)
Definition: pqformat.c:581
Portal GetPortalByName(const char *name)
Definition: portalmem.c:130
void SignalHandlerForConfigReload(SIGNAL_ARGS)
Definition: interrupt.c:56
void InitStandaloneProcess(const char *argv0)
Definition: miscinit.c:136
bool IsAbortedTransactionBlockState(void)
Definition: xact.c:375
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
void SPICleanup(void)
Definition: spi.c:349
static void forbidden_in_wal_sender(char firstchar)
Definition: postgres.c:4536
void proc_exit(int code)
Definition: ipc.c:104
int errcode(int sqlerrcode)
Definition: elog.c:610
bool IsTransactionOrTransactionBlock(void)
Definition: xact.c:4653
void pq_putemptymessage(char msgtype)
Definition: pqformat.c:390
#define SetProcessingMode(mode)
Definition: miscadmin.h:398
void BaseInit(void)
Definition: postinit.c:548
#define printf(...)
Definition: port.h:198
void checkDataDir(void)
Definition: miscinit.c:265
#define SIGPIPE
Definition: win32_port.h:158
#define SIGUSR2
Definition: win32_port.h:166
unsigned int Oid
Definition: postgres_ext.h:31
const char * progname
Definition: pg_standby.c:36
void FlushErrorState(void)
Definition: elog.c:1568
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
void pq_beginmessage(StringInfo buf, char msgtype)
Definition: pqformat.c:87
void StatementCancelHandler(SIGNAL_ARGS)
Definition: postgres.c:2840
signed int int32
Definition: c.h:355
static void exec_execute_message(const char *portal_name, long max_rows)
Definition: postgres.c:2026
static void log_disconnections(int code, Datum arg)
Definition: postgres.c:4703
void jit_reset_after_error(void)
Definition: jit.c:128
#define RESUME_INTERRUPTS()
Definition: miscadmin.h:118
ErrorContextCallback * error_context_stack
Definition: elog.c:92
void set_ps_display(const char *activity)
Definition: ps_status.c:349
static void pq_sendint32(StringInfo buf, uint32 i)
Definition: pqformat.h:145
void pqinitmask(void)
Definition: pqsignal.c:41
bool am_walsender
Definition: walsender.c:115
void disable_all_timeouts(bool keep_indicators)
Definition: timeout.c:598
#define ERROR
Definition: elog.h:43
void CreateDataDirLockFile(bool amPostmaster)
Definition: miscinit.c:1236
void ProcessNotifyInterrupt(void)
Definition: async.c:1895
bool pq_is_reading_msg(void)
Definition: pqcomm.c:1237
int IdleInTransactionSessionTimeout
Definition: proc.c:63
int32 MyCancelKey
Definition: globals.c:44
void WalSndSignals(void)
Definition: walsender.c:2989
#define FATAL
Definition: elog.h:52
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:192
void InitProcess(void)
Definition: proc.c:304
Definition: dest.h:89
static char * buf
Definition: pg_test_fsync.c:67
bool IsUnderPostmaster
Definition: globals.c:109
static void exec_bind_message(StringInfo input_message)
Definition: postgres.c:1606
Definition: dest.h:90
#define SIGHUP
Definition: win32_port.h:153
void LocalProcessControlFile(bool reset)
Definition: xlog.c:4984
void ChangeToDataDir(void)
Definition: miscinit.c:379
void ReplicationSlotRelease(void)
Definition: slot.c:424
sigset_t UnBlockSig
Definition: pqsignal.c:22
void PortalErrorCleanup(void)
Definition: portalmem.c:910
static bool xact_started
Definition: postgres.c:133
void InitWalSender(void)
MemoryContext TopMemoryContext
Definition: mcxt.c:44
Definition: guc.h:72
#define SIG_IGN
Definition: win32_port.h:150
void initStringInfo(StringInfo str)
Definition: stringinfo.c:59
const char * debug_query_string
Definition: postgres.c:88
#define MemoryContextResetAndDeleteChildren(ctx)
Definition: memutils.h:67
static void exec_parse_message(const char *query_string, const char *stmt_name, Oid *paramTypes, int numParams)
Definition: postgres.c:1349
#define PortalIsValid(p)
Definition: portal.h:203
static void start_xact_command(void)
Definition: postgres.c:2618
static bool doing_extended_query_message
Definition: postgres.c:146
sigset_t BlockSig
Definition: pqsignal.c:22
void process_session_preload_libraries(void)
Definition: miscinit.c:1633
void WalSndErrorCleanup(void)
Definition: walsender.c:299
bool SelectConfigFiles(const char *userDoption, const char *progname)
Definition: guc.c:5510
void EmitErrorReport(void)
Definition: elog.c:1423
static StringInfoData row_description_buf
Definition: postgres.c:168
TimestampTz PgStartTime
Definition: timestamp.c:49
static char * username
Definition: initdb.c:133
#define InvalidOid
Definition: postgres_ext.h:36
#define ereport(elevel,...)
Definition: elog.h:144
void InitPostgres(const char *in_dbname, Oid dboid, const char *username, Oid useroid, char *out_dbname, bool override_allow_connections)
Definition: postinit.c:590
pqsigfunc pqsignal(int signum, pqsigfunc handler)
Definition: signal.c:170
int pq_getmsgbyte(StringInfo msg)
Definition: pqformat.c:401
void enable_timeout_after(TimeoutId id, int delay_ms)
Definition: timeout.c:435
ReplicationSlot * MyReplicationSlot
Definition: slot.c:96
#define pq_comm_reset()
Definition: libpq.h:38
#define SIG_DFL
Definition: win32_port.h:148
void ProcessCompletedNotifies(void)
Definition: async.c:1223
void HandleFunctionRequest(StringInfo msgBuf)
Definition: fastpath.c:259
void InvalidateCatalogSnapshotConditionally(void)
Definition: snapmgr.c:533
static bool DoingCommandRead
Definition: postgres.c:140
void InitializeMaxBackends(void)
Definition: postinit.c:526
char * dbname
Definition: streamutil.c:50
MemoryContext MessageContext
Definition: mcxt.c:48
sigjmp_buf * PG_exception_stack
Definition: elog.c:94
static const char * userDoption
Definition: postgres.c:157
void SetCurrentStatementStartTimestamp(void)
Definition: xact.c:817
void * palloc(Size size)
Definition: mcxt.c:949
int errmsg(const char *fmt,...)
Definition: elog.c:824
void PortalDrop(Portal portal, bool isTopCommit)
Definition: portalmem.c:467
void ReadyForQuery(CommandDest dest)
Definition: dest.c:270
void pq_endmessage(StringInfo buf)
Definition: pqformat.c:298
void die(SIGNAL_ARGS)
Definition: postgres.c:2809
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:116
volatile sig_atomic_t ConfigReloadPending
Definition: interrupt.c:26
int i
void FloatExceptionHandler(SIGNAL_ARGS)
Definition: postgres.c:2861
static void drop_unnamed_stmt(void)
Definition: postgres.c:2717
void ReplicationSlotCleanup(void)
Definition: slot.c:479
volatile sig_atomic_t notifyInterruptPending
Definition: async.c:415
unsigned int pq_getmsgint(StringInfo msg, int b)
Definition: pqformat.c:417
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:99
bool Log_disconnections
Definition: postgres.c:94
void process_postgres_switches(int argc, char *argv[], GucContext ctx, const char **dbname)
Definition: postgres.c:3501
void pq_getmsgend(StringInfo msg)
Definition: pqformat.c:637
void disable_timeout(TimeoutId id, bool keep_indicator)
Definition: timeout.c:532
void procsignal_sigusr1_handler(SIGNAL_ARGS)
Definition: procsignal.c:533
CommandDest whereToSendOutput
Definition: postgres.c:91
static bool ignore_till_sync
Definition: postgres.c:147
static MemoryContext row_description_context
Definition: postgres.c:167
void quickdie(SIGNAL_ARGS)
Definition: postgres.c:2742
MemoryContext PostmasterContext
Definition: mcxt.c:46
static void exec_simple_query(const char *query_string)
Definition: postgres.c:983
void InitializeGUCOptions(void)
Definition: guc.c:5288
void pgstat_report_stat(bool force)
Definition: pgstat.c:809
void DropPreparedStatement(const char *stmt_name, bool showError)
Definition: prepare.c:554
static void exec_describe_statement_message(const char *stmt_name)
Definition: postgres.c:2471

◆ process_postgres_switches()

void process_postgres_switches ( int  argc,
char *  argv[],
GucContext  ctx,
const char **  dbname 
)

Definition at line 3501 of file postgres.c.

References EchoQuery, ereport, errcode(), errhint(), errmsg(), ERROR, FATAL, flag(), free, FrontendProtocol, get_stats_option_name(), getopt(), IsBinaryUpgrade, IsUnderPostmaster, MAXPGPATH, name, optarg, opterr, optind, OutputFileName, ParseLongOption(), PGC_POSTMASTER, PGC_S_ARGV, PGC_S_CLIENT, progname, set_debug_options(), set_plan_disabling_options(), SetConfigOption(), strlcpy(), userDoption, UseSemiNewlineNewline, and value.

Referenced by PostgresMain(), and process_startup_options().

3503 {
3504  bool secure = (ctx == PGC_POSTMASTER);
3505  int errs = 0;
3506  GucSource gucsource;
3507  int flag;
3508 
3509  if (secure)
3510  {
3511  gucsource = PGC_S_ARGV; /* switches came from command line */
3512 
3513  /* Ignore the initial --single argument, if present */
3514  if (argc > 1 && strcmp(argv[1], "--single") == 0)
3515  {
3516  argv++;
3517  argc--;
3518  }
3519  }
3520  else
3521  {
3522  gucsource = PGC_S_CLIENT; /* switches came from client */
3523  }
3524 
3525 #ifdef HAVE_INT_OPTERR
3526 
3527  /*
3528  * Turn this off because it's either printed to stderr and not the log
3529  * where we'd want it, or argv[0] is now "--single", which would make for
3530  * a weird error message. We print our own error message below.
3531  */
3532  opterr = 0;
3533 #endif
3534 
3535  /*
3536  * Parse command-line options. CAUTION: keep this in sync with
3537  * postmaster/postmaster.c (the option sets should not conflict) and with
3538  * the common help() function in main/main.c.
3539  */
3540  while ((flag = getopt(argc, argv, "B:bc:C:D:d:EeFf:h:ijk:lN:nOo:Pp:r:S:sTt:v:W:-:")) != -1)
3541  {
3542  switch (flag)
3543  {
3544  case 'B':
3545  SetConfigOption("shared_buffers", optarg, ctx, gucsource);
3546  break;
3547 
3548  case 'b':
3549  /* Undocumented flag used for binary upgrades */
3550  if (secure)
3551  IsBinaryUpgrade = true;
3552  break;
3553 
3554  case 'C':
3555  /* ignored for consistency with the postmaster */
3556  break;
3557 
3558  case 'D':
3559  if (secure)
3560  userDoption = strdup(optarg);
3561  break;
3562 
3563  case 'd':
3564  set_debug_options(atoi(optarg), ctx, gucsource);
3565  break;
3566 
3567  case 'E':
3568  if (secure)
3569  EchoQuery = true;
3570  break;
3571 
3572  case 'e':
3573  SetConfigOption("datestyle", "euro", ctx, gucsource);
3574  break;
3575 
3576  case 'F':
3577  SetConfigOption("fsync", "false", ctx, gucsource);
3578  break;
3579 
3580  case 'f':
3581  if (!set_plan_disabling_options(optarg, ctx, gucsource))
3582  errs++;
3583  break;
3584 
3585  case 'h':
3586  SetConfigOption("listen_addresses", optarg, ctx, gucsource);
3587  break;
3588 
3589  case 'i':
3590  SetConfigOption("listen_addresses", "*", ctx, gucsource);
3591  break;
3592 
3593  case 'j':
3594  if (secure)
3595  UseSemiNewlineNewline = true;
3596  break;
3597 
3598  case 'k':
3599  SetConfigOption("unix_socket_directories", optarg, ctx, gucsource);
3600  break;
3601 
3602  case 'l':
3603  SetConfigOption("ssl", "true", ctx, gucsource);
3604  break;
3605 
3606  case 'N':
3607  SetConfigOption("max_connections", optarg, ctx, gucsource);
3608  break;
3609 
3610  case 'n':
3611  /* ignored for consistency with postmaster */
3612  break;
3613 
3614  case 'O':
3615  SetConfigOption("allow_system_table_mods", "true", ctx, gucsource);
3616  break;
3617 
3618  case 'o':
3619  errs++;
3620  break;
3621 
3622  case 'P':
3623  SetConfigOption("ignore_system_indexes", "true", ctx, gucsource);
3624  break;
3625 
3626  case 'p':
3627  SetConfigOption("port", optarg, ctx, gucsource);
3628  break;
3629 
3630  case 'r':
3631  /* send output (stdout and stderr) to the given file */
3632  if (secure)
3634  break;
3635 
3636  case 'S':
3637  SetConfigOption("work_mem", optarg, ctx, gucsource);
3638  break;
3639 
3640  case 's':
3641  SetConfigOption("log_statement_stats", "true", ctx, gucsource);
3642  break;
3643 
3644  case 'T':
3645  /* ignored for consistency with the postmaster */
3646  break;
3647 
3648  case 't':
3649  {
3650  const char *tmp = get_stats_option_name(optarg);
3651 
3652  if (tmp)
3653  SetConfigOption(tmp, "true", ctx, gucsource);
3654  else
3655  errs++;
3656  break;
3657  }
3658 
3659  case 'v':
3660 
3661  /*
3662  * -v is no longer used in normal operation, since
3663  * FrontendProtocol is already set before we get here. We keep
3664  * the switch only for possible use in standalone operation,
3665  * in case we ever support using normal FE/BE protocol with a
3666  * standalone backend.
3667  */
3668  if (secure)
3670  break;
3671 
3672  case 'W':
3673  SetConfigOption("post_auth_delay", optarg, ctx, gucsource);
3674  break;
3675 
3676  case 'c':
3677  case '-':
3678  {
3679  char *name,
3680  *value;
3681 
3682  ParseLongOption(optarg, &name, &value);
3683  if (!value)
3684  {
3685  if (flag == '-')
3686  ereport(ERROR,
3687  (errcode(ERRCODE_SYNTAX_ERROR),
3688  errmsg("--%s requires a value",
3689  optarg)));
3690  else
3691  ereport(ERROR,
3692  (errcode(ERRCODE_SYNTAX_ERROR),
3693  errmsg("-c %s requires a value",
3694  optarg)));
3695  }
3696  SetConfigOption(name, value, ctx, gucsource);
3697  free(name);
3698  if (value)
3699  free(value);
3700  break;
3701  }
3702 
3703  default:
3704  errs++;
3705  break;
3706  }
3707 
3708  if (errs)
3709  break;
3710  }
3711 
3712  /*
3713  * Optional database name should be there only if *dbname is NULL.
3714  */
3715  if (!errs && dbname && *dbname == NULL && argc - optind >= 1)
3716  *dbname = strdup(argv[optind++]);
3717 
3718  if (errs || argc != optind)
3719  {
3720  if (errs)
3721  optind--; /* complain about the previous argument */
3722 
3723  /* spell the error message a bit differently depending on context */
3724  if (IsUnderPostmaster)
3725  ereport(FATAL,
3726  errcode(ERRCODE_SYNTAX_ERROR),
3727  errmsg("invalid command-line argument for server process: %s", argv[optind]),
3728  errhint("Try \"%s --help\" for more information.", progname));
3729  else
3730  ereport(FATAL,
3731  errcode(ERRCODE_SYNTAX_ERROR),
3732  errmsg("%s: invalid command-line argument: %s",
3733  progname, argv[optind]),
3734  errhint("Try \"%s --help\" for more information.", progname));
3735  }
3736 
3737  /*
3738  * Reset getopt(3) library so that it will work correctly in subprocesses
3739  * or when this function is called a second time with another array.
3740  */
3741  optind = 1;
3742 #ifdef HAVE_INT_OPTRESET
3743  optreset = 1; /* some systems need this too */
3744 #endif
3745 }
int errhint(const char *fmt,...)
Definition: elog.c:1071
void ParseLongOption(const char *string, char **name, char **value)
Definition: guc.c:10473
bool set_plan_disabling_options(const char *arg, GucContext context, GucSource source)
Definition: postgres.c:3419
int errcode(int sqlerrcode)
Definition: elog.c:610
const char * get_stats_option_name(const char *arg)
Definition: postgres.c:3461
void set_debug_options(int debug_flag, GucContext context, GucSource source)
Definition: postgres.c:3390
const char * progname
Definition: pg_standby.c:36
bool IsBinaryUpgrade
Definition: globals.c:110
int getopt(int nargc, char *const *nargv, const char *ostr)
Definition: getopt.c:71
GucSource
Definition: guc.h:105
int optind
Definition: getopt.c:50
#define ERROR
Definition: elog.h:43
#define FATAL
Definition: elog.h:52
#define MAXPGPATH
char OutputFileName[MAXPGPATH]
Definition: globals.c:70
void SetConfigOption(const char *name, const char *value, GucContext context, GucSource source)
Definition: guc.c:7658
bool IsUnderPostmaster
Definition: globals.c:109
char * flag(int b)
Definition: test-ctype.c:33
int opterr
Definition: getopt.c:49
uint32 ProtocolVersion
Definition: pqcomm.h:113
static struct @143 value
#define ereport(elevel,...)
Definition: elog.h:144
#define free(a)
Definition: header.h:65
size_t strlcpy(char *dst, const char *src, size_t siz)
Definition: strlcpy.c:45
char * dbname
Definition: streamutil.c:50
const char * name
Definition: encode.c:521
static bool EchoQuery
Definition: postgres.c:158
static const char * userDoption
Definition: postgres.c:157
static bool UseSemiNewlineNewline
Definition: postgres.c:159
int errmsg(const char *fmt,...)
Definition: elog.c:824
char * optarg
Definition: getopt.c:52
ProtocolVersion FrontendProtocol
Definition: globals.c:28

◆ ProcessClientReadInterrupt()

void ProcessClientReadInterrupt ( bool  blocked)

Definition at line 526 of file postgres.c.

References catchupInterruptPending, CHECK_FOR_INTERRUPTS, DoingCommandRead, MyLatch, notifyInterruptPending, ProcDiePending, ProcessCatchupInterrupt(), ProcessNotifyInterrupt(), and SetLatch().

Referenced by interactive_getc(), and secure_read().

527 {
528  int save_errno = errno;
529 
530  if (DoingCommandRead)
531  {
532  /* Check for general interrupts that arrived before/while reading */
534 
535  /* Process sinval catchup interrupts, if any */
538 
539  /* Process notify interrupts, if any */
542  }
543  else if (ProcDiePending)
544  {
545  /*
546  * We're dying. If there is no data available to read, then it's safe
547  * (and sane) to handle that now. If we haven't tried to read yet,
548  * make sure the process latch is set, so that if there is no data
549  * then we'll come back here and die. If we're done reading, also
550  * make sure the process latch is set, as we might've undesirably
551  * cleared it while reading.
552  */
553  if (blocked)
555  else
556  SetLatch(MyLatch);
557  }
558 
559  errno = save_errno;
560 }
void ProcessCatchupInterrupt(void)
Definition: sinval.c:176
void SetLatch(Latch *latch)
Definition: latch.c:457
void ProcessNotifyInterrupt(void)
Definition: async.c:1895
volatile sig_atomic_t ProcDiePending
Definition: globals.c:32
static bool DoingCommandRead
Definition: postgres.c:140
struct Latch * MyLatch
Definition: globals.c:54
volatile sig_atomic_t notifyInterruptPending
Definition: async.c:415
volatile sig_atomic_t catchupInterruptPending
Definition: sinval.c:41
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:99

◆ ProcessClientWriteInterrupt()

void ProcessClientWriteInterrupt ( bool  blocked)

Definition at line 572 of file postgres.c.

References CHECK_FOR_INTERRUPTS, CritSectionCount, DestNone, DestRemote, InterruptHoldoffCount, MyLatch, ProcDiePending, SetLatch(), and whereToSendOutput.

Referenced by secure_write().

573 {
574  int save_errno = errno;
575 
576  if (ProcDiePending)
577  {
578  /*
579  * We're dying. If it's not possible to write, then we should handle
580  * that immediately, else a stuck client could indefinitely delay our
581  * response to the signal. If we haven't tried to write yet, make
582  * sure the process latch is set, so that if the write would block
583  * then we'll come back here and die. If we're done writing, also
584  * make sure the process latch is set, as we might've undesirably
585  * cleared it while writing.
586  */
587  if (blocked)
588  {
589  /*
590  * Don't mess with whereToSendOutput if ProcessInterrupts wouldn't
591  * do anything.
592  */
593  if (InterruptHoldoffCount == 0 && CritSectionCount == 0)
594  {
595  /*
596  * We don't want to send the client the error message, as a)
597  * that would possibly block again, and b) it would likely
598  * lead to loss of protocol sync because we may have already
599  * sent a partial protocol message.
600  */
603 
605  }
606  }
607  else
608  SetLatch(MyLatch);
609  }
610 
611  errno = save_errno;
612 }
volatile uint32 InterruptHoldoffCount
Definition: globals.c:36
void SetLatch(Latch *latch)
Definition: latch.c:457
Definition: dest.h:89
volatile uint32 CritSectionCount
Definition: globals.c:38
volatile sig_atomic_t ProcDiePending
Definition: globals.c:32
struct Latch * MyLatch
Definition: globals.c:54
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:99
CommandDest whereToSendOutput
Definition: postgres.c:91

◆ quickdie()

void quickdie ( SIGNAL_ARGS  )

Definition at line 2742 of file postgres.c.

References BlockSig, ClientAuthInProgress, DestNone, DestRemote, ereport, errcode(), errdetail(), errhint(), errmsg(), HOLD_INTERRUPTS, PG_SETMASK, SIGQUIT, WARNING, and whereToSendOutput.

Referenced by AutoVacLauncherMain(), AutoVacWorkerMain(), PostgresMain(), and WalSndSignals().

2743 {
2744  sigaddset(&BlockSig, SIGQUIT); /* prevent nested calls */
2745  PG_SETMASK(&BlockSig);
2746 
2747  /*
2748  * Prevent interrupts while exiting; though we just blocked signals that
2749  * would queue new interrupts, one may have been pending. We don't want a
2750  * quickdie() downgraded to a mere query cancel.
2751  */
2752  HOLD_INTERRUPTS();
2753 
2754  /*
2755  * If we're aborting out of client auth, don't risk trying to send
2756  * anything to the client; we will likely violate the protocol, not to
2757  * mention that we may have interrupted the guts of OpenSSL or some
2758  * authentication library.
2759  */
2762 
2763  /*
2764  * Notify the client before exiting, to give a clue on what happened.
2765  *
2766  * It's dubious to call ereport() from a signal handler. It is certainly
2767  * not async-signal safe. But it seems better to try, than to disconnect
2768  * abruptly and leave the client wondering what happened. It's remotely
2769  * possible that we crash or hang while trying to send the message, but
2770  * receiving a SIGQUIT is a sign that something has already gone badly
2771  * wrong, so there's not much to lose. Assuming the postmaster is still
2772  * running, it will SIGKILL us soon if we get stuck for some reason.
2773  *
2774  * Ideally this should be ereport(FATAL), but then we'd not get control
2775  * back...
2776  */
2777  ereport(WARNING,
2778  (errcode(ERRCODE_CRASH_SHUTDOWN),
2779  errmsg("terminating connection because of crash of another server process"),
2780  errdetail("The postmaster has commanded this server process to roll back"
2781  " the current transaction and exit, because another"
2782  " server process exited abnormally and possibly corrupted"
2783  " shared memory."),
2784  errhint("In a moment you should be able to reconnect to the"
2785  " database and repeat your command.")));
2786 
2787  /*
2788  * We DO NOT want to run proc_exit() or atexit() callbacks -- we're here
2789  * because shared memory may be corrupted, so we don't want to try to
2790  * clean up our transaction. Just nail the windows shut and get out of
2791  * town. The callbacks wouldn't be safe to run from a signal handler,
2792  * anyway.
2793  *
2794  * Note we do _exit(2) not _exit(0). This is to force the postmaster into
2795  * a system reset cycle if someone sends a manual SIGQUIT to a random
2796  * backend. This is necessary precisely because we don't clean up our
2797  * shared memory state. (The "dead man switch" mechanism in pmsignal.c
2798  * should ensure the postmaster sees this as a crash, too, but no harm in
2799  * being doubly sure.)
2800  */
2801  _exit(2);
2802 }
#define SIGQUIT
Definition: win32_port.h:154
int errhint(const char *fmt,...)
Definition: elog.c:1071
int errcode(int sqlerrcode)
Definition: elog.c:610
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
bool ClientAuthInProgress
Definition: postmaster.c:352
Definition: dest.h:89
int errdetail(const char *fmt,...)
Definition: elog.c:957
#define WARNING
Definition: elog.h:40
sigset_t BlockSig
Definition: pqsignal.c:22
#define ereport(elevel,...)
Definition: elog.h:144
int errmsg(const char *fmt,...)
Definition: elog.c:824
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:116
CommandDest whereToSendOutput
Definition: postgres.c:91

◆ RecoveryConflictInterrupt()

void RecoveryConflictInterrupt ( ProcSignalReason  reason)

Definition at line 2879 of file postgres.c.

References Assert, elog, FATAL, HoldingBufferPinThatDelaysRecovery(), InterruptPending, IsAbortedTransactionBlockState(), IsSubTransaction(), IsTransactionOrTransactionBlock(), IsWaitingForLock(), MyLatch, MyProc, proc_exit_inprogress, ProcDiePending, PROCSIG_RECOVERY_CONFLICT_BUFFERPIN, PROCSIG_RECOVERY_CONFLICT_DATABASE, PROCSIG_RECOVERY_CONFLICT_LOCK, PROCSIG_RECOVERY_CONFLICT_SNAPSHOT, PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK, PROCSIG_RECOVERY_CONFLICT_TABLESPACE, QueryCancelPending, PGPROC::recoveryConflictPending, RecoveryConflictPending, RecoveryConflictReason, RecoveryConflictRetryable, and SetLatch().

Referenced by procsignal_sigusr1_handler().

2880 {
2881  int save_errno = errno;
2882 
2883  /*
2884  * Don't joggle the elbow of proc_exit
2885  */
2886  if (!proc_exit_inprogress)
2887  {
2888  RecoveryConflictReason = reason;
2889  switch (reason)
2890  {
2892 
2893  /*
2894  * If we aren't waiting for a lock we can never deadlock.
2895  */
2896  if (!IsWaitingForLock())
2897  return;
2898 
2899  /* Intentional fall through to check wait for pin */
2900  /* FALLTHROUGH */
2901 
2903 
2904  /*
2905  * If we aren't blocking the Startup process there is nothing
2906  * more to do.
2907  */
2909  return;
2910 
2912 
2913  /* Intentional fall through to error handling */
2914  /* FALLTHROUGH */
2915 
2919 
2920  /*
2921  * If we aren't in a transaction any longer then ignore.
2922  */
2924  return;
2925 
2926  /*
2927  * If we can abort just the current subtransaction then we are
2928  * OK to throw an ERROR to resolve the conflict. Otherwise
2929  * drop through to the FATAL case.
2930  *
2931  * XXX other times that we can throw just an ERROR *may* be
2932  * PROCSIG_RECOVERY_CONFLICT_LOCK if no locks are held in
2933  * parent transactions
2934  *
2935  * PROCSIG_RECOVERY_CONFLICT_SNAPSHOT if no snapshots are held
2936  * by parent transactions and the transaction is not
2937  * transaction-snapshot mode
2938  *
2939  * PROCSIG_RECOVERY_CONFLICT_TABLESPACE if no temp files or
2940  * cursors open in parent transactions
2941  */
2942  if (!IsSubTransaction())
2943  {
2944  /*
2945  * If we already aborted then we no longer need to cancel.
2946  * We do this here since we do not wish to ignore aborted
2947  * subtransactions, which must cause FATAL, currently.
2948  */
2950  return;
2951 
2952  RecoveryConflictPending = true;
2953  QueryCancelPending = true;
2954  InterruptPending = true;
2955  break;
2956  }
2957 
2958  /* Intentional fall through to session cancel */
2959  /* FALLTHROUGH */
2960 
2962  RecoveryConflictPending = true;
2963  ProcDiePending = true;
2964  InterruptPending = true;
2965  break;
2966 
2967  default:
2968  elog(FATAL, "unrecognized conflict mode: %d",
2969  (int) reason);
2970  }
2971 
2973 
2974  /*
2975  * All conflicts apart from database cause dynamic errors where the
2976  * command or transaction can be retried at a later point with some
2977  * potential for success. No need to reset this, since non-retryable
2978  * conflict errors are currently FATAL.
2979  */
2980  if (reason == PROCSIG_RECOVERY_CONFLICT_DATABASE)
2981  RecoveryConflictRetryable = false;
2982  }
2983 
2984  /*
2985  * Set the process latch. This function essentially emulates signal
2986  * handlers like die() and StatementCancelHandler() and it seems prudent
2987  * to behave similarly as they do.
2988  */
2989  SetLatch(MyLatch);
2990 
2991  errno = save_errno;
2992 }
bool IsWaitingForLock(void)
Definition: proc.c:694
volatile sig_atomic_t QueryCancelPending
Definition: globals.c:31
PGPROC * MyProc
Definition: proc.c:67
bool IsAbortedTransactionBlockState(void)
Definition: xact.c:375
bool IsTransactionOrTransactionBlock(void)
Definition: xact.c:4653
void SetLatch(Latch *latch)
Definition: latch.c:457
#define FATAL
Definition: elog.h:52
bool recoveryConflictPending
Definition: proc.h:127
static ProcSignalReason RecoveryConflictReason
Definition: postgres.c:164
static bool RecoveryConflictPending
Definition: postgres.c:162
static bool RecoveryConflictRetryable
Definition: postgres.c:163
#define Assert(condition)
Definition: c.h:738
volatile sig_atomic_t ProcDiePending
Definition: globals.c:32
bool proc_exit_inprogress
Definition: ipc.c:40
bool HoldingBufferPinThatDelaysRecovery(void)
Definition: bufmgr.c:3728
volatile sig_atomic_t InterruptPending
Definition: globals.c:30
bool IsSubTransaction(void)
Definition: xact.c:4708
#define elog(elevel,...)
Definition: elog.h:214
struct Latch * MyLatch
Definition: globals.c:54

◆ ResetUsage()

void ResetUsage ( void  )

Definition at line 4594 of file postgres.c.

References getrusage(), gettimeofday(), RUSAGE_SELF, Save_r, and Save_t.

Referenced by _bt_leader_participate_as_worker(), _bt_leafbuild(), _bt_parallel_build_main(), _SPI_pquery(), btbuild(), exec_bind_message(), exec_execute_message(), exec_parse_message(), exec_simple_query(), pg_analyze_and_rewrite(), pg_analyze_and_rewrite_params(), pg_parse_query(), pg_plan_query(), pg_rewrite_query(), PortalRun(), and PortalRunMulti().

4595 {
4597  gettimeofday(&Save_t, NULL);
4598 }
int gettimeofday(struct timeval *tp, struct timezone *tzp)
Definition: gettimeofday.c:104
static struct rusage Save_r
Definition: postgres.c:4590
int getrusage(int who, struct rusage *rusage)
Definition: getrusage.c:31
static struct timeval Save_t
Definition: postgres.c:4591
#define RUSAGE_SELF
Definition: rusagestub.h:23

◆ set_debug_options()

void set_debug_options ( int  debug_flag,
GucContext  context,
GucSource  source 
)

Definition at line 3390 of file postgres.c.

References PGC_POSTMASTER, SetConfigOption(), and sprintf.

Referenced by PostmasterMain(), and process_postgres_switches().

3391 {
3392  if (debug_flag > 0)
3393  {
3394  char debugstr[64];
3395 
3396  sprintf(debugstr, "debug%d", debug_flag);
3397  SetConfigOption("log_min_messages", debugstr, context, source);
3398  }
3399  else
3400  SetConfigOption("log_min_messages", "notice", context, source);
3401 
3402  if (debug_flag >= 1 && context == PGC_POSTMASTER)
3403  {
3404  SetConfigOption("log_connections", "true", context, source);
3405  SetConfigOption("log_disconnections", "true", context, source);
3406  }
3407  if (debug_flag >= 2)
3408  SetConfigOption("log_statement", "all", context, source);
3409  if (debug_flag >= 3)
3410  SetConfigOption("debug_print_parse", "true", context, source);
3411  if (debug_flag >= 4)
3412  SetConfigOption("debug_print_plan", "true", context, source);
3413  if (debug_flag >= 5)
3414  SetConfigOption("debug_print_rewritten", "true", context, source);
3415 }
#define sprintf
Definition: port.h:194
void SetConfigOption(const char *name, const char *value, GucContext context, GucSource source)
Definition: guc.c:7658

◆ set_plan_disabling_options()

bool set_plan_disabling_options ( const char *  arg,
GucContext  context,
GucSource  source 
)

Definition at line 3419 of file postgres.c.

References SetConfigOption().

Referenced by PostmasterMain(), and process_postgres_switches().

3420 {
3421  const char *tmp = NULL;
3422 
3423  switch (arg[0])
3424  {
3425  case 's': /* seqscan */
3426  tmp = "enable_seqscan";
3427  break;
3428  case 'i': /* indexscan */
3429  tmp = "enable_indexscan";
3430  break;
3431  case 'o': /* indexonlyscan */
3432  tmp = "enable_indexonlyscan";
3433  break;
3434  case 'b': /* bitmapscan */
3435  tmp = "enable_bitmapscan";
3436  break;
3437  case 't': /* tidscan */
3438  tmp = "enable_tidscan";
3439  break;
3440  case 'n': /* nestloop */
3441  tmp = "enable_nestloop";
3442  break;
3443  case 'm': /* mergejoin */
3444  tmp = "enable_mergejoin";
3445  break;
3446  case 'h': /* hashjoin */
3447  tmp = "enable_hashjoin";
3448  break;
3449  }
3450  if (tmp)
3451  {
3452  SetConfigOption(tmp, "false", context, source);
3453  return true;
3454  }
3455  else
3456  return false;
3457 }
void SetConfigOption(const char *name, const char *value, GucContext context, GucSource source)
Definition: guc.c:7658
void * arg

◆ ShowUsage()

void ShowUsage ( const char *  title)

Definition at line 4601 of file postgres.c.

References __darwin__, appendStringInfo(), appendStringInfoString(), StringInfoData::data, ereport, errdetail_internal(), errmsg_internal(), getrusage(), gettimeofday(), initStringInfo(), StringInfoData::len, LOG, pfree(), rusage::ru_stime, rusage::ru_utime, RUSAGE_SELF, Save_r, Save_t, and generate_unaccent_rules::str.

Referenced by _bt_leader_participate_as_worker(), _bt_leafbuild(), _bt_parallel_build_main(), _SPI_pquery(), btbuild(), exec_bind_message(), exec_execute_message(), exec_parse_message(), exec_simple_query(), pg_analyze_and_rewrite(), pg_analyze_and_rewrite_params(), pg_parse_query(), pg_plan_query(), pg_rewrite_query(), PortalRun(), and PortalRunMulti().

4602 {
4604  struct timeval user,
4605  sys;
4606  struct timeval elapse_t;
4607  struct rusage r;
4608 
4609  getrusage(RUSAGE_SELF, &r);
4610  gettimeofday(&elapse_t, NULL);
4611  memcpy((char *) &user, (char *) &r.ru_utime, sizeof(user));
4612  memcpy((char *) &sys, (char *) &r.ru_stime, sizeof(sys));
4613  if (elapse_t.tv_usec < Save_t.tv_usec)
4614  {
4615  elapse_t.tv_sec--;
4616  elapse_t.tv_usec += 1000000;
4617  }
4618  if (r.ru_utime.tv_usec < Save_r.ru_utime.tv_usec)
4619  {
4620  r.ru_utime.tv_sec--;
4621  r.ru_utime.tv_usec += 1000000;
4622  }
4623  if (r.ru_stime.tv_usec < Save_r.ru_stime.tv_usec)
4624  {
4625  r.ru_stime.tv_sec--;
4626  r.ru_stime.tv_usec += 1000000;
4627  }
4628 
4629  /*
4630  * The only stats we don't show here are ixrss, idrss, isrss. It takes
4631  * some work to interpret them, and most platforms don't fill them in.
4632  */
4633  initStringInfo(&str);
4634 
4635  appendStringInfoString(&str, "! system usage stats:\n");
4636  appendStringInfo(&str,
4637  "!\t%ld.%06ld s user, %ld.%06ld s system, %ld.%06ld s elapsed\n",
4638  (long) (r.ru_utime.tv_sec - Save_r.ru_utime.tv_sec),
4639  (long) (r.ru_utime.tv_usec - Save_r.ru_utime.tv_usec),
4640  (long) (r.ru_stime.tv_sec - Save_r.ru_stime.tv_sec),
4641  (long) (r.ru_stime.tv_usec - Save_r.ru_stime.tv_usec),
4642  (long) (elapse_t.tv_sec - Save_t.tv_sec),
4643  (long) (elapse_t.tv_usec - Save_t.tv_usec));
4644  appendStringInfo(&str,
4645  "!\t[%ld.%06ld s user, %ld.%06ld s system total]\n",
4646  (long) user.tv_sec,
4647  (long) user.tv_usec,
4648  (long) sys.tv_sec,
4649  (long) sys.tv_usec);
4650 #if defined(HAVE_GETRUSAGE)
4651  appendStringInfo(&str,
4652  "!\t%ld kB max resident size\n",
4653 #if defined(__darwin__)
4654  /* in bytes on macOS */
4655  r.ru_maxrss / 1024
4656 #else
4657  /* in kilobytes on most other platforms */
4658  r.ru_maxrss
4659 #endif
4660  );
4661  appendStringInfo(&str,
4662  "!\t%ld/%ld [%ld/%ld] filesystem blocks in/out\n",
4663  r.ru_inblock - Save_r.ru_inblock,
4664  /* they only drink coffee at dec */
4665  r.ru_oublock - Save_r.ru_oublock,
4666  r.ru_inblock, r.ru_oublock);
4667  appendStringInfo(&str,
4668  "!\t%ld/%ld [%ld/%ld] page faults/reclaims, %ld [%ld] swaps\n",
4669  r.ru_majflt - Save_r.ru_majflt,
4670  r.ru_minflt - Save_r.ru_minflt,
4671  r.ru_majflt, r.ru_minflt,
4672  r.ru_nswap - Save_r.ru_nswap,
4673  r.ru_nswap);
4674  appendStringInfo(&str,
4675  "!\t%ld [%ld] signals rcvd, %ld/%ld [%ld/%ld] messages rcvd/sent\n",
4676  r.ru_nsignals - Save_r.ru_nsignals,
4677  r.ru_nsignals,
4678  r.ru_msgrcv - Save_r.ru_msgrcv,
4679  r.ru_msgsnd - Save_r.ru_msgsnd,
4680  r.ru_msgrcv, r.ru_msgsnd);
4681  appendStringInfo(&str,
4682  "!\t%ld/%ld [%ld/%ld] voluntary/involuntary context switches\n",
4683  r.ru_nvcsw - Save_r.ru_nvcsw,
4684  r.ru_nivcsw - Save_r.ru_nivcsw,
4685  r.ru_nvcsw, r.ru_nivcsw);
4686 #endif /* HAVE_GETRUSAGE */
4687 
4688  /* remove trailing newline */
4689  if (str.data[str.len - 1] == '\n')
4690  str.data[--str.len] = '\0';
4691 
4692  ereport(LOG,
4693  (errmsg_internal("%s", title),
4694  errdetail_internal("%s", str.data)));
4695 
4696  pfree(str.data);
4697 }
int gettimeofday(struct timeval *tp, struct timezone *tzp)
Definition: gettimeofday.c:104
static struct rusage Save_r
Definition: postgres.c:4590
struct timeval ru_stime
Definition: rusagestub.h:29
int getrusage(int who, struct rusage *rusage)
Definition: getrusage.c:31
#define LOG
Definition: elog.h:26
int errdetail_internal(const char *fmt,...)
Definition: elog.c:984
void pfree(void *pointer)
Definition: mcxt.c:1056
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:91
void appendStringInfoString(StringInfo str, const char *s)
Definition: stringinfo.c:176
static struct timeval Save_t
Definition: postgres.c:4591
void initStringInfo(StringInfo str)
Definition: stringinfo.c:59
struct timeval ru_utime
Definition: rusagestub.h:28
#define RUSAGE_SELF
Definition: rusagestub.h:23
#define ereport(elevel,...)
Definition: elog.h:144
int errmsg_internal(const char *fmt,...)
Definition: elog.c:911
static char * user
Definition: pg_regress.c:93
#define __darwin__
Definition: darwin.h:3

◆ StatementCancelHandler()

void StatementCancelHandler ( SIGNAL_ARGS  )

Definition at line 2840 of file postgres.c.

References InterruptPending, MyLatch, proc_exit_inprogress, QueryCancelPending, and SetLatch().

Referenced by AutoVacLauncherMain(), AutoVacWorkerMain(), PostgresMain(), StartBackgroundWorker(), and WalSndSignals().

2841 {
2842  int save_errno = errno;
2843 
2844  /*
2845  * Don't joggle the elbow of proc_exit
2846  */
2847  if (!proc_exit_inprogress)
2848  {
2849  InterruptPending = true;
2850  QueryCancelPending = true;
2851  }
2852 
2853  /* If we're still here, waken anything waiting on the process latch */
2854  SetLatch(MyLatch);
2855 
2856  errno = save_errno;
2857 }
volatile sig_atomic_t QueryCancelPending
Definition: globals.c:31
void SetLatch(Latch *latch)
Definition: latch.c:457
bool proc_exit_inprogress
Definition: ipc.c:40
volatile sig_atomic_t InterruptPending
Definition: globals.c:30
struct Latch * MyLatch
Definition: globals.c:54

Variable Documentation

◆ debug_query_string

◆ log_statement

PGDLLIMPORT int log_statement

Definition at line 96 of file postgres.c.

Referenced by check_log_statement(), and HandleFunctionRequest().

◆ max_stack_depth

int max_stack_depth

Definition at line 99 of file postgres.c.

Referenced by check_stack_depth().

◆ PostAuthDelay

int PostAuthDelay

◆ whereToSendOutput