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:
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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, int cursorOptions, ParamListInfo boundParams)
 
Listpg_plan_queries (List *querytrees, 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 3342 of file postgres.c.

References max_stack_depth_bytes.

3343 {
3344  long newval_bytes = newval * 1024L;
3345 
3346  max_stack_depth_bytes = newval_bytes;
3347 }
static long max_stack_depth_bytes
Definition: postgres.c:111
#define newval

◆ check_log_duration()

int check_log_duration ( char *  msec_str,
bool  was_logged 
)

Definition at line 2231 of file postgres.c.

References GetCurrentStatementStartTimestamp(), GetCurrentTimestamp(), log_duration, log_min_duration_statement, snprintf, TimestampDifference(), and xact_is_sampled.

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

2232 {
2234  {
2235  long secs;
2236  int usecs;
2237  int msecs;
2238  bool exceeded;
2239 
2242  &secs, &usecs);
2243  msecs = usecs / 1000;
2244 
2245  /*
2246  * This odd-looking test for log_min_duration_statement being exceeded
2247  * is designed to avoid integer overflow with very long durations:
2248  * don't compute secs * 1000 until we've verified it will fit in int.
2249  */
2250  exceeded = (log_min_duration_statement == 0 ||
2252  (secs > log_min_duration_statement / 1000 ||
2253  secs * 1000 + msecs >= log_min_duration_statement)));
2254 
2255  if (exceeded || log_duration || xact_is_sampled)
2256  {
2257  snprintf(msec_str, 32, "%ld.%03d",
2258  secs * 1000 + msecs, usecs % 1000);
2259  if ((exceeded || xact_is_sampled) && !was_logged)
2260  return 2;
2261  else
2262  return 1;
2263  }
2264  }
2265 
2266  return 0;
2267 }
int log_min_duration_statement
Definition: guc.c:512
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1583
bool xact_is_sampled
Definition: xact.c:268
bool log_duration
Definition: guc.c:485
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:792

◆ check_max_stack_depth()

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

Definition at line 3325 of file postgres.c.

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

3326 {
3327  long newval_bytes = *newval * 1024L;
3328  long stack_rlimit = get_stack_depth_rlimit();
3329 
3330  if (stack_rlimit > 0 && newval_bytes > stack_rlimit - STACK_DEPTH_SLOP)
3331  {
3332  GUC_check_errdetail("\"max_stack_depth\" must not exceed %ldkB.",
3333  (stack_rlimit - STACK_DEPTH_SLOP) / 1024L);
3334  GUC_check_errhint("Increase the platform's stack depth limit via \"ulimit -s\" or local equivalent.");
3335  return false;
3336  }
3337  return true;
3338 }
#define GUC_check_errdetail
Definition: guc.h:409
long get_stack_depth_rlimit(void)
Definition: postgres.c:4516
#define newval
#define GUC_check_errhint
Definition: guc.h:413
#define STACK_DEPTH_SLOP
Definition: tcopprot.h:26

◆ die()

void die ( SIGNAL_ARGS  )

Definition at line 2761 of file postgres.c.

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

Referenced by PostgresMain().

2762 {
2763  int save_errno = errno;
2764 
2765  /* Don't joggle the elbow of proc_exit */
2766  if (!proc_exit_inprogress)
2767  {
2768  InterruptPending = true;
2769  ProcDiePending = true;
2770  }
2771 
2772  /* If we're still here, waken anything waiting on the process latch */
2773  SetLatch(MyLatch);
2774 
2775  /*
2776  * If we're in single user mode, we want to quit immediately - we can't
2777  * rely on latches as they wouldn't work when stdin/stdout is a file.
2778  * Rather ugly, but it's unlikely to be worthwhile to invest much more
2779  * effort just for the benefit of single user mode.
2780  */
2783 
2784  errno = save_errno;
2785 }
void SetLatch(Latch *latch)
Definition: latch.c:436
void ProcessInterrupts(void)
Definition: postgres.c:2972
volatile sig_atomic_t ProcDiePending
Definition: globals.c:32
bool proc_exit_inprogress
Definition: ipc.c:40
static bool DoingCommandRead
Definition: postgres.c:139
volatile sig_atomic_t InterruptPending
Definition: globals.c:30
struct Latch * MyLatch
Definition: globals.c:54
CommandDest whereToSendOutput
Definition: postgres.c:90

◆ FloatExceptionHandler()

void FloatExceptionHandler ( SIGNAL_ARGS  )

Definition at line 2813 of file postgres.c.

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

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

2814 {
2815  /* We're not returning, so no need to save errno */
2816  ereport(ERROR,
2817  (errcode(ERRCODE_FLOATING_POINT_EXCEPTION),
2818  errmsg("floating-point exception"),
2819  errdetail("An invalid floating-point operation was signaled. "
2820  "This probably means an out-of-range result or an "
2821  "invalid operation, such as division by zero.")));
2822 }
int errcode(int sqlerrcode)
Definition: elog.c:570
#define ERROR
Definition: elog.h:43
int errdetail(const char *fmt,...)
Definition: elog.c:860
#define ereport(elevel, rest)
Definition: elog.h:141
int errmsg(const char *fmt,...)
Definition: elog.c:784

◆ get_stack_depth_rlimit()

long get_stack_depth_rlimit ( void  )

Definition at line 4516 of file postgres.c.

References val.

Referenced by check_max_stack_depth(), and InitializeGUCOptionsFromEnvironment().

4517 {
4518 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_STACK)
4519  static long val = 0;
4520 
4521  /* This won't change after process launch, so check just once */
4522  if (val == 0)
4523  {
4524  struct rlimit rlim;
4525 
4526  if (getrlimit(RLIMIT_STACK, &rlim) < 0)
4527  val = -1;
4528  else if (rlim.rlim_cur == RLIM_INFINITY)
4529  val = LONG_MAX;
4530  /* rlim_cur is probably of an unsigned type, so check for overflow */
4531  else if (rlim.rlim_cur >= LONG_MAX)
4532  val = LONG_MAX;
4533  else
4534  val = rlim.rlim_cur;
4535  }
4536  return val;
4537 #else /* no getrlimit */
4538 #if defined(WIN32) || defined(__CYGWIN__)
4539  /* On Windows we set the backend stack size in src/backend/Makefile */
4540  return WIN32_STACK_RLIMIT;
4541 #else /* not windows ... give up */
4542  return -1;
4543 #endif
4544 #endif
4545 }
long val
Definition: informix.c:684

◆ get_stats_option_name()

const char* get_stats_option_name ( const char *  arg)

Definition at line 3428 of file postgres.c.

References optarg.

Referenced by PostmasterMain(), and process_postgres_switches().

3429 {
3430  switch (arg[0])
3431  {
3432  case 'p':
3433  if (optarg[1] == 'a') /* "parser" */
3434  return "log_parser_stats";
3435  else if (optarg[1] == 'l') /* "planner" */
3436  return "log_planner_stats";
3437  break;
3438 
3439  case 'e': /* "executor" */
3440  return "log_executor_stats";
3441  break;
3442  }
3443 
3444  return NULL;
3445 }
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 680 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().

683 {
684  Query *query;
685  List *querytree_list;
686 
687  TRACE_POSTGRESQL_QUERY_REWRITE_START(query_string);
688 
689  /*
690  * (1) Perform parse analysis.
691  */
692  if (log_parser_stats)
693  ResetUsage();
694 
695  query = parse_analyze(parsetree, query_string, paramTypes, numParams,
696  queryEnv);
697 
698  if (log_parser_stats)
699  ShowUsage("PARSE ANALYSIS STATISTICS");
700 
701  /*
702  * (2) Rewrite the queries, as necessary
703  */
704  querytree_list = pg_rewrite_query(query);
705 
706  TRACE_POSTGRESQL_QUERY_REWRITE_DONE(query_string);
707 
708  return querytree_list;
709 }
bool log_parser_stats
Definition: guc.c:491
void ShowUsage(const char *title)
Definition: postgres.c:4559
void ResetUsage(void)
Definition: postgres.c:4552
static List * pg_rewrite_query(Query *query)
Definition: postgres.c:769
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 717 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().

722 {
723  ParseState *pstate;
724  Query *query;
725  List *querytree_list;
726 
727  Assert(query_string != NULL); /* required as of 8.4 */
728 
729  TRACE_POSTGRESQL_QUERY_REWRITE_START(query_string);
730 
731  /*
732  * (1) Perform parse analysis.
733  */
734  if (log_parser_stats)
735  ResetUsage();
736 
737  pstate = make_parsestate(NULL);
738  pstate->p_sourcetext = query_string;
739  pstate->p_queryEnv = queryEnv;
740  (*parserSetup) (pstate, parserSetupArg);
741 
742  query = transformTopLevelStmt(pstate, parsetree);
743 
745  (*post_parse_analyze_hook) (pstate, query);
746 
747  free_parsestate(pstate);
748 
749  if (log_parser_stats)
750  ShowUsage("PARSE ANALYSIS STATISTICS");
751 
752  /*
753  * (2) Rewrite the queries, as necessary
754  */
755  querytree_list = pg_rewrite_query(query);
756 
757  TRACE_POSTGRESQL_QUERY_REWRITE_DONE(query_string);
758 
759  return querytree_list;
760 }
bool log_parser_stats
Definition: guc.c:491
QueryEnvironment * p_queryEnv
Definition: parse_node.h:200
void ShowUsage(const char *title)
Definition: postgres.c:4559
ParseState * make_parsestate(ParseState *parentParseState)
Definition: parse_node.c:44
void ResetUsage(void)
Definition: postgres.c:4552
const char * p_sourcetext
Definition: parse_node.h:176
static List * pg_rewrite_query(Query *query)
Definition: postgres.c:769
#define Assert(condition)
Definition: c.h:732
Query * transformTopLevelStmt(ParseState *pstate, RawStmt *parseTree)
Definition: analyze.c:191
void free_parsestate(ParseState *pstate)
Definition: parse_node.c:77
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 632 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().

633 {
634  List *raw_parsetree_list;
635 
636  TRACE_POSTGRESQL_QUERY_PARSE_START(query_string);
637 
638  if (log_parser_stats)
639  ResetUsage();
640 
641  raw_parsetree_list = raw_parser(query_string);
642 
643  if (log_parser_stats)
644  ShowUsage("PARSER STATISTICS");
645 
646 #ifdef COPY_PARSE_PLAN_TREES
647  /* Optional debugging check: pass raw parsetrees through copyObject() */
648  {
649  List *new_list = copyObject(raw_parsetree_list);
650 
651  /* This checks both copyObject() and the equal() routines... */
652  if (!equal(new_list, raw_parsetree_list))
653  elog(WARNING, "copyObject() failed to produce an equal raw parse tree");
654  else
655  raw_parsetree_list = new_list;
656  }
657 #endif
658 
659  /*
660  * Currently, outfuncs/readfuncs support is missing for many raw parse
661  * tree nodes, so we don't try to implement WRITE_READ_PARSE_PLAN_TREES
662  * here.
663  */
664 
665  TRACE_POSTGRESQL_QUERY_PARSE_DONE(query_string);
666 
667  return raw_parsetree_list;
668 }
List * raw_parser(const char *str)
Definition: parser.c:36
bool log_parser_stats
Definition: guc.c:491
bool equal(const void *a, const void *b)
Definition: equalfuncs.c:3008
void ShowUsage(const char *title)
Definition: postgres.c:4559
void ResetUsage(void)
Definition: postgres.c:4552
#define WARNING
Definition: elog.h:40
#define elog(elevel,...)
Definition: elog.h:226
#define copyObject(obj)
Definition: nodes.h:641
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,
int  cursorOptions,
ParamListInfo  boundParams 
)

Definition at line 946 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().

947 {
948  List *stmt_list = NIL;
949  ListCell *query_list;
950 
951  foreach(query_list, querytrees)
952  {
953  Query *query = lfirst_node(Query, query_list);
954  PlannedStmt *stmt;
955 
956  if (query->commandType == CMD_UTILITY)
957  {
958  /* Utility commands require no planning. */
959  stmt = makeNode(PlannedStmt);
960  stmt->commandType = CMD_UTILITY;
961  stmt->canSetTag = query->canSetTag;
962  stmt->utilityStmt = query->utilityStmt;
963  stmt->stmt_location = query->stmt_location;
964  stmt->stmt_len = query->stmt_len;
965  }
966  else
967  {
968  stmt = pg_plan_query(query, cursorOptions, boundParams);
969  }
970 
971  stmt_list = lappend(stmt_list, stmt);
972  }
973 
974  return stmt_list;
975 }
#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:94
#define lfirst_node(type, lc)
Definition: pg_list.h:193
int stmt_location
Definition: plannodes.h:93
Node * utilityStmt
Definition: plannodes.h:90
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:573
bool canSetTag
Definition: parsenodes.h:118
Definition: pg_list.h:50
int stmt_len
Definition: parsenodes.h:181
PlannedStmt * pg_plan_query(Query *querytree, int cursorOptions, ParamListInfo boundParams)
Definition: postgres.c:861

◆ pg_plan_query()

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

Definition at line 861 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().

862 {
863  PlannedStmt *plan;
864 
865  /* Utility commands have no plans. */
866  if (querytree->commandType == CMD_UTILITY)
867  return NULL;
868 
869  /* Planner must have a snapshot in case it calls user-defined functions. */
871 
872  TRACE_POSTGRESQL_QUERY_PLAN_START();
873 
874  if (log_planner_stats)
875  ResetUsage();
876 
877  /* call the optimizer */
878  plan = planner(querytree, cursorOptions, boundParams);
879 
880  if (log_planner_stats)
881  ShowUsage("PLANNER STATISTICS");
882 
883 #ifdef COPY_PARSE_PLAN_TREES
884  /* Optional debugging check: pass plan tree through copyObject() */
885  {
886  PlannedStmt *new_plan = copyObject(plan);
887 
888  /*
889  * equal() currently does not have routines to compare Plan nodes, so
890  * don't try to test equality here. Perhaps fix someday?
891  */
892 #ifdef NOT_USED
893  /* This checks both copyObject() and the equal() routines... */
894  if (!equal(new_plan, plan))
895  elog(WARNING, "copyObject() failed to produce an equal plan tree");
896  else
897 #endif
898  plan = new_plan;
899  }
900 #endif
901 
902 #ifdef WRITE_READ_PARSE_PLAN_TREES
903  /* Optional debugging check: pass plan tree through outfuncs/readfuncs */
904  {
905  char *str;
906  PlannedStmt *new_plan;
907 
908  str = nodeToString(plan);
909  new_plan = stringToNodeWithLocations(str);
910  pfree(str);
911 
912  /*
913  * equal() currently does not have routines to compare Plan nodes, so
914  * don't try to test equality here. Perhaps fix someday?
915  */
916 #ifdef NOT_USED
917  /* This checks both outfuncs/readfuncs and the equal() routines... */
918  if (!equal(new_plan, plan))
919  elog(WARNING, "outfuncs/readfuncs failed to produce an equal plan tree");
920  else
921 #endif
922  plan = new_plan;
923  }
924 #endif
925 
926  /*
927  * Print plan if debugging.
928  */
929  if (Debug_print_plan)
930  elog_node_display(LOG, "plan", plan, Debug_pretty_print);
931 
932  TRACE_POSTGRESQL_QUERY_PLAN_DONE();
933 
934  return plan;
935 }
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:3008
void ShowUsage(const char *title)
Definition: postgres.c:4559
#define LOG
Definition: elog.h:26
PlannedStmt * planner(Query *parse, int cursorOptions, ParamListInfo boundParams)
Definition: planner.c:268
void ResetUsage(void)
Definition: postgres.c:4552
bool Debug_print_plan
Definition: guc.c:486
void pfree(void *pointer)
Definition: mcxt.c:1056
bool ActiveSnapshotSet(void)
Definition: snapmgr.c:853
#define WARNING
Definition: elog.h:40
CmdType commandType
Definition: parsenodes.h:112
#define Assert(condition)
Definition: c.h:732
#define elog(elevel,...)
Definition: elog.h:226
bool Debug_pretty_print
Definition: guc.c:489
char * nodeToString(const void *obj)
Definition: outfuncs.c:4316
#define copyObject(obj)
Definition: nodes.h:641
bool log_planner_stats
Definition: guc.c:492

◆ PostgresMain()

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

Definition at line 3727 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, on_proc_exit(), palloc(), PG_exception_stack, PG_SETMASK, PGC_POSTMASTER, PGC_SIGHUP, PgStartTime, pgstat_report_activity(), pgstat_report_stat(), PortalDrop(), PortalErrorCleanup(), PortalIsValid, PostgresSigHupHandler(), 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(), procsignal_sigusr1_handler(), progname, QueryCancelPending, quickdie(), ReadCommand(), ReadyForQuery(), ReplicationSlotCleanup(), ReplicationSlotRelease(), RESUME_INTERRUPTS, SelectConfigFiles(), set_ps_display(), SetCurrentStatementStartTimestamp(), SetProcessingMode, SIG_DFL, SIG_IGN, SIGCHLD, SIGHUP, SIGPIPE, SIGQUIT, SIGUSR1, SIGUSR2, SPICleanup(), start_xact_command(), STATE_FASTPATH, STATE_IDLE, STATE_IDLEINTRANSACTION, STATE_IDLEINTRANSACTION_ABORTED, StatementCancelHandler(), stmt_timeout_active, TopMemoryContext, UnBlockSig, userDoption, username, WalSndErrorCleanup(), WalSndSignals(), whereToSendOutput, and xact_started.

Referenced by BackendRun(), and main().

3730 {
3731  int firstchar;
3732  StringInfoData input_message;
3733  sigjmp_buf local_sigjmp_buf;
3734  volatile bool send_ready_for_query = true;
3735  bool disable_idle_in_transaction_timeout = false;
3736 
3737  /* Initialize startup process environment if necessary. */
3738  if (!IsUnderPostmaster)
3739  InitStandaloneProcess(argv[0]);
3740 
3742 
3743  /*
3744  * Set default values for command-line options.
3745  */
3746  if (!IsUnderPostmaster)
3748 
3749  /*
3750  * Parse command-line options.
3751  */
3753 
3754  /* Must have gotten a database name, or have a default (the username) */
3755  if (dbname == NULL)
3756  {
3757  dbname = username;
3758  if (dbname == NULL)
3759  ereport(FATAL,
3760  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3761  errmsg("%s: no database nor user name specified",
3762  progname)));
3763  }
3764 
3765  /* Acquire configuration parameters, unless inherited from postmaster */
3766  if (!IsUnderPostmaster)
3767  {
3769  proc_exit(1);
3770  }
3771 
3772  /*
3773  * Set up signal handlers and masks.
3774  *
3775  * Note that postmaster blocked all signals before forking child process,
3776  * so there is no race condition whereby we might receive a signal before
3777  * we have set up the handler.
3778  *
3779  * Also note: it's best not to use any signals that are SIG_IGNored in the
3780  * postmaster. If such a signal arrives before we are able to change the
3781  * handler to non-SIG_IGN, it'll get dropped. Instead, make a dummy
3782  * handler in the postmaster to reserve the signal. (Of course, this isn't
3783  * an issue for signals that are locally generated, such as SIGALRM and
3784  * SIGPIPE.)
3785  */
3786  if (am_walsender)
3787  WalSndSignals();
3788  else
3789  {
3790  pqsignal(SIGHUP, PostgresSigHupHandler); /* set flag to read config
3791  * file */
3792  pqsignal(SIGINT, StatementCancelHandler); /* cancel current query */
3793  pqsignal(SIGTERM, die); /* cancel current query and exit */
3794 
3795  /*
3796  * In a standalone backend, SIGQUIT can be generated from the keyboard
3797  * easily, while SIGTERM cannot, so we make both signals do die()
3798  * rather than quickdie().
3799  */
3800  if (IsUnderPostmaster)
3801  pqsignal(SIGQUIT, quickdie); /* hard crash time */
3802  else
3803  pqsignal(SIGQUIT, die); /* cancel current query and exit */
3804  InitializeTimeouts(); /* establishes SIGALRM handler */
3805 
3806  /*
3807  * Ignore failure to write to frontend. Note: if frontend closes
3808  * connection, we will notice it and exit cleanly when control next
3809  * returns to outer loop. This seems safer than forcing exit in the
3810  * midst of output during who-knows-what operation...
3811  */
3816 
3817  /*
3818  * Reset some signals that are accepted by postmaster but not by
3819  * backend
3820  */
3821  pqsignal(SIGCHLD, SIG_DFL); /* system() requires this on some
3822  * platforms */
3823  }
3824 
3825  pqinitmask();
3826 
3827  if (IsUnderPostmaster)
3828  {
3829  /* We allow SIGQUIT (quickdie) at all times */
3830  sigdelset(&BlockSig, SIGQUIT);
3831  }
3832 
3833  PG_SETMASK(&BlockSig); /* block everything except SIGQUIT */
3834 
3835  if (!IsUnderPostmaster)
3836  {
3837  /*
3838  * Validate we have been given a reasonable-looking DataDir (if under
3839  * postmaster, assume postmaster did this already).
3840  */
3841  checkDataDir();
3842 
3843  /* Change into DataDir (if under postmaster, was done already) */
3844  ChangeToDataDir();
3845 
3846  /*
3847  * Create lockfile for data directory.
3848  */
3849  CreateDataDirLockFile(false);
3850 
3851  /* read control file (error checking and contains config ) */
3852  LocalProcessControlFile(false);
3853 
3854  /* Initialize MaxBackends (if under postmaster, was done already) */
3856  }
3857 
3858  /* Early initialization */
3859  BaseInit();
3860 
3861  /*
3862  * Create a per-backend PGPROC struct in shared memory, except in the
3863  * EXEC_BACKEND case where this was done in SubPostmasterMain. We must do
3864  * this before we can use LWLocks (and in the EXEC_BACKEND case we already
3865  * had to do some stuff with LWLocks).
3866  */
3867 #ifdef EXEC_BACKEND
3868  if (!IsUnderPostmaster)
3869  InitProcess();
3870 #else
3871  InitProcess();
3872 #endif
3873 
3874  /* We need to allow SIGINT, etc during the initial transaction */
3876 
3877  /*
3878  * General initialization.
3879  *
3880  * NOTE: if you are tempted to add code in this vicinity, consider putting
3881  * it inside InitPostgres() instead. In particular, anything that
3882  * involves database access should be there, not here.
3883  */
3885 
3886  /*
3887  * If the PostmasterContext is still around, recycle the space; we don't
3888  * need it anymore after InitPostgres completes. Note this does not trash
3889  * *MyProcPort, because ConnCreate() allocated that space with malloc()
3890  * ... else we'd need to copy the Port data first. Also, subsidiary data
3891  * such as the username isn't lost either; see ProcessStartupPacket().
3892  */
3893  if (PostmasterContext)
3894  {
3896  PostmasterContext = NULL;
3897  }
3898 
3900 
3901  /*
3902  * Now all GUC states are fully set up. Report them to client if
3903  * appropriate.
3904  */
3906 
3907  /*
3908  * Also set up handler to log session end; we have to wait till now to be
3909  * sure Log_disconnections has its final value.
3910  */
3913 
3914  /* Perform initialization specific to a WAL sender process. */
3915  if (am_walsender)
3916  InitWalSender();
3917 
3918  /*
3919  * process any libraries that should be preloaded at backend start (this
3920  * likewise can't be done until GUC settings are complete)
3921  */
3923 
3924  /*
3925  * Send this backend's cancellation info to the frontend.
3926  */
3928  {
3930 
3931  pq_beginmessage(&buf, 'K');
3932  pq_sendint32(&buf, (int32) MyProcPid);
3933  pq_sendint32(&buf, (int32) MyCancelKey);
3934  pq_endmessage(&buf);
3935  /* Need not flush since ReadyForQuery will do it. */
3936  }
3937 
3938  /* Welcome banner for standalone case */
3940  printf("\nPostgreSQL stand-alone backend %s\n", PG_VERSION);
3941 
3942  /*
3943  * Create the memory context we will use in the main loop.
3944  *
3945  * MessageContext is reset once per iteration of the main loop, ie, upon
3946  * completion of processing of each command message from the client.
3947  */
3949  "MessageContext",
3951 
3952  /*
3953  * Create memory context and buffer used for RowDescription messages. As
3954  * SendRowDescriptionMessage(), via exec_describe_statement_message(), is
3955  * frequently executed for ever single statement, we don't want to
3956  * allocate a separate buffer every time.
3957  */
3959  "RowDescriptionContext",
3964 
3965  /*
3966  * Remember stand-alone backend startup time
3967  */
3968  if (!IsUnderPostmaster)
3970 
3971  /*
3972  * POSTGRES main processing loop begins here
3973  *
3974  * If an exception is encountered, processing resumes here so we abort the
3975  * current transaction and start a new one.
3976  *
3977  * You might wonder why this isn't coded as an infinite loop around a
3978  * PG_TRY construct. The reason is that this is the bottom of the
3979  * exception stack, and so with PG_TRY there would be no exception handler
3980  * in force at all during the CATCH part. By leaving the outermost setjmp
3981  * always active, we have at least some chance of recovering from an error
3982  * during error recovery. (If we get into an infinite loop thereby, it
3983  * will soon be stopped by overflow of elog.c's internal state stack.)
3984  *
3985  * Note that we use sigsetjmp(..., 1), so that this function's signal mask
3986  * (to wit, UnBlockSig) will be restored when longjmp'ing to here. This
3987  * is essential in case we longjmp'd out of a signal handler on a platform
3988  * where that leaves the signal blocked. It's not redundant with the
3989  * unblock in AbortTransaction() because the latter is only called if we
3990  * were inside a transaction.
3991  */
3992 
3993  if (sigsetjmp(local_sigjmp_buf, 1) != 0)
3994  {
3995  /*
3996  * NOTE: if you are tempted to add more code in this if-block,
3997  * consider the high probability that it should be in
3998  * AbortTransaction() instead. The only stuff done directly here
3999  * should be stuff that is guaranteed to apply *only* for outer-level
4000  * error recovery, such as adjusting the FE/BE protocol status.
4001  */
4002 
4003  /* Since not using PG_TRY, must reset error stack by hand */
4004  error_context_stack = NULL;
4005 
4006  /* Prevent interrupts while cleaning up */
4007  HOLD_INTERRUPTS();
4008 
4009  /*
4010  * Forget any pending QueryCancel request, since we're returning to
4011  * the idle loop anyway, and cancel any active timeout requests. (In
4012  * future we might want to allow some timeout requests to survive, but
4013  * at minimum it'd be necessary to do reschedule_timeouts(), in case
4014  * we got here because of a query cancel interrupting the SIGALRM
4015  * interrupt handler.) Note in particular that we must clear the
4016  * statement and lock timeout indicators, to prevent any future plain
4017  * query cancels from being misreported as timeouts in case we're
4018  * forgetting a timeout cancel.
4019  */
4020  disable_all_timeouts(false);
4021  QueryCancelPending = false; /* second to avoid race condition */
4022  stmt_timeout_active = false;
4023 
4024  /* Not reading from the client anymore. */
4025  DoingCommandRead = false;
4026 
4027  /* Make sure libpq is in a good state */
4028  pq_comm_reset();
4029 
4030  /* Report the error to the client and/or server log */
4031  EmitErrorReport();
4032 
4033  /*
4034  * Make sure debug_query_string gets reset before we possibly clobber
4035  * the storage it points at.
4036  */
4037  debug_query_string = NULL;
4038 
4039  /*
4040  * Abort the current transaction in order to recover.
4041  */
4043 
4044  if (am_walsender)
4046 
4048  SPICleanup();
4049 
4050  /*
4051  * We can't release replication slots inside AbortTransaction() as we
4052  * need to be able to start and abort transactions while having a slot
4053  * acquired. But we never need to hold them across top level errors,
4054  * so releasing here is fine. There's another cleanup in ProcKill()
4055  * ensuring we'll correctly cleanup on FATAL errors as well.
4056  */
4057  if (MyReplicationSlot != NULL)
4059 
4060  /* We also want to cleanup temporary slots on error. */
4062 
4064 
4065  /*
4066  * Now return to normal top-level context and clear ErrorContext for
4067  * next time.
4068  */
4070  FlushErrorState();
4071 
4072  /*
4073  * If we were handling an extended-query-protocol message, initiate
4074  * skip till next Sync. This also causes us not to issue
4075  * ReadyForQuery (until we get Sync).
4076  */
4078  ignore_till_sync = true;
4079 
4080  /* We don't have a transaction command open anymore */
4081  xact_started = false;
4082 
4083  /*
4084  * If an error occurred while we were reading a message from the
4085  * client, we have potentially lost track of where the previous
4086  * message ends and the next one begins. Even though we have
4087  * otherwise recovered from the error, we cannot safely read any more
4088  * messages from the client, so there isn't much we can do with the
4089  * connection anymore.
4090  */
4091  if (pq_is_reading_msg())
4092  ereport(FATAL,
4093  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4094  errmsg("terminating connection because protocol synchronization was lost")));
4095 
4096  /* Now we can allow interrupts again */
4098  }
4099 
4100  /* We can now handle ereport(ERROR) */
4101  PG_exception_stack = &local_sigjmp_buf;
4102 
4103  if (!ignore_till_sync)
4104  send_ready_for_query = true; /* initially, or after error */
4105 
4106  /*
4107  * Non-error queries loop here.
4108  */
4109 
4110  for (;;)
4111  {
4112  /*
4113  * At top of loop, reset extended-query-message flag, so that any
4114  * errors encountered in "idle" state don't provoke skip.
4115  */
4117 
4118  /*
4119  * Release storage left over from prior query cycle, and create a new
4120  * query input buffer in the cleared MessageContext.
4121  */
4124 
4125  initStringInfo(&input_message);
4126 
4127  /*
4128  * Also consider releasing our catalog snapshot if any, so that it's
4129  * not preventing advance of global xmin while we wait for the client.
4130  */
4132 
4133  /*
4134  * (1) If we've reached idle state, tell the frontend we're ready for
4135  * a new query.
4136  *
4137  * Note: this includes fflush()'ing the last of the prior output.
4138  *
4139  * This is also a good time to send collected statistics to the
4140  * collector, and to update the PS stats display. We avoid doing
4141  * those every time through the message loop because it'd slow down
4142  * processing of batched messages, and because we don't want to report
4143  * uncommitted updates (that confuses autovacuum). The notification
4144  * processor wants a call too, if we are not in a transaction block.
4145  */
4146  if (send_ready_for_query)
4147  {
4149  {
4150  set_ps_display("idle in transaction (aborted)", false);
4152 
4153  /* Start the idle-in-transaction timer */
4155  {
4156  disable_idle_in_transaction_timeout = true;
4159  }
4160  }
4162  {
4163  set_ps_display("idle in transaction", false);
4165 
4166  /* Start the idle-in-transaction timer */
4168  {
4169  disable_idle_in_transaction_timeout = true;
4172  }
4173  }
4174  else
4175  {
4177  pgstat_report_stat(false);
4178 
4179  set_ps_display("idle", false);
4181  }
4182 
4184  send_ready_for_query = false;
4185  }
4186 
4187  /*
4188  * (2) Allow asynchronous signals to be executed immediately if they
4189  * come in while we are waiting for client input. (This must be
4190  * conditional since we don't want, say, reads on behalf of COPY FROM
4191  * STDIN doing the same thing.)
4192  */
4193  DoingCommandRead = true;
4194 
4195  /*
4196  * (3) read a command (loop blocks here)
4197  */
4198  firstchar = ReadCommand(&input_message);
4199 
4200  /*
4201  * (4) disable async signal conditions again.
4202  *
4203  * Query cancel is supposed to be a no-op when there is no query in
4204  * progress, so if a query cancel arrived while we were idle, just
4205  * reset QueryCancelPending. ProcessInterrupts() has that effect when
4206  * it's called when DoingCommandRead is set, so check for interrupts
4207  * before resetting DoingCommandRead.
4208  */
4210  DoingCommandRead = false;
4211 
4212  /*
4213  * (5) turn off the idle-in-transaction timeout
4214  */
4215  if (disable_idle_in_transaction_timeout)
4216  {
4218  disable_idle_in_transaction_timeout = false;
4219  }
4220 
4221  /*
4222  * (6) check for any other interesting events that happened while we
4223  * slept.
4224  */
4225  if (ConfigReloadPending)
4226  {
4227  ConfigReloadPending = false;
4229  }
4230 
4231  /*
4232  * (7) process the command. But ignore it if we're skipping till
4233  * Sync.
4234  */
4235  if (ignore_till_sync && firstchar != EOF)
4236  continue;
4237 
4238  switch (firstchar)
4239  {
4240  case 'Q': /* simple query */
4241  {
4242  const char *query_string;
4243 
4244  /* Set statement_timestamp() */
4246 
4247  query_string = pq_getmsgstring(&input_message);
4248  pq_getmsgend(&input_message);
4249 
4250  if (am_walsender)
4251  {
4252  if (!exec_replication_command(query_string))
4253  exec_simple_query(query_string);
4254  }
4255  else
4256  exec_simple_query(query_string);
4257 
4258  send_ready_for_query = true;
4259  }
4260  break;
4261 
4262  case 'P': /* parse */
4263  {
4264  const char *stmt_name;
4265  const char *query_string;
4266  int numParams;
4267  Oid *paramTypes = NULL;
4268 
4269  forbidden_in_wal_sender(firstchar);
4270 
4271  /* Set statement_timestamp() */
4273 
4274  stmt_name = pq_getmsgstring(&input_message);
4275  query_string = pq_getmsgstring(&input_message);
4276  numParams = pq_getmsgint(&input_message, 2);
4277  if (numParams > 0)
4278  {
4279  paramTypes = (Oid *) palloc(numParams * sizeof(Oid));
4280  for (int i = 0; i < numParams; i++)
4281  paramTypes[i] = pq_getmsgint(&input_message, 4);
4282  }
4283  pq_getmsgend(&input_message);
4284 
4285  exec_parse_message(query_string, stmt_name,
4286  paramTypes, numParams);
4287  }
4288  break;
4289 
4290  case 'B': /* bind */
4291  forbidden_in_wal_sender(firstchar);
4292 
4293  /* Set statement_timestamp() */
4295 
4296  /*
4297  * this message is complex enough that it seems best to put
4298  * the field extraction out-of-line
4299  */
4300  exec_bind_message(&input_message);
4301  break;
4302 
4303  case 'E': /* execute */
4304  {
4305  const char *portal_name;
4306  int max_rows;
4307 
4308  forbidden_in_wal_sender(firstchar);
4309 
4310  /* Set statement_timestamp() */
4312 
4313  portal_name = pq_getmsgstring(&input_message);
4314  max_rows = pq_getmsgint(&input_message, 4);
4315  pq_getmsgend(&input_message);
4316 
4317  exec_execute_message(portal_name, max_rows);
4318  }
4319  break;
4320 
4321  case 'F': /* fastpath function call */
4322  forbidden_in_wal_sender(firstchar);
4323 
4324  /* Set statement_timestamp() */
4326 
4327  /* Report query to various monitoring facilities. */
4329  set_ps_display("<FASTPATH>", false);
4330 
4331  /* start an xact for this function invocation */
4333 
4334  /*
4335  * Note: we may at this point be inside an aborted
4336  * transaction. We can't throw error for that until we've
4337  * finished reading the function-call message, so
4338  * HandleFunctionRequest() must check for it after doing so.
4339  * Be careful not to do anything that assumes we're inside a
4340  * valid transaction here.
4341  */
4342 
4343  /* switch back to message context */
4345 
4346  HandleFunctionRequest(&input_message);
4347 
4348  /* commit the function-invocation transaction */
4350 
4351  send_ready_for_query = true;
4352  break;
4353 
4354  case 'C': /* close */
4355  {
4356  int close_type;
4357  const char *close_target;
4358 
4359  forbidden_in_wal_sender(firstchar);
4360 
4361  close_type = pq_getmsgbyte(&input_message);
4362  close_target = pq_getmsgstring(&input_message);
4363  pq_getmsgend(&input_message);
4364 
4365  switch (close_type)
4366  {
4367  case 'S':
4368  if (close_target[0] != '\0')
4369  DropPreparedStatement(close_target, false);
4370  else
4371  {
4372  /* special-case the unnamed statement */
4374  }
4375  break;
4376  case 'P':
4377  {
4378  Portal portal;
4379 
4380  portal = GetPortalByName(close_target);
4381  if (PortalIsValid(portal))
4382  PortalDrop(portal, false);
4383  }
4384  break;
4385  default:
4386  ereport(ERROR,
4387  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4388  errmsg("invalid CLOSE message subtype %d",
4389  close_type)));
4390  break;
4391  }
4392 
4394  pq_putemptymessage('3'); /* CloseComplete */
4395  }
4396  break;
4397 
4398  case 'D': /* describe */
4399  {
4400  int describe_type;
4401  const char *describe_target;
4402 
4403  forbidden_in_wal_sender(firstchar);
4404 
4405  /* Set statement_timestamp() (needed for xact) */
4407 
4408  describe_type = pq_getmsgbyte(&input_message);
4409  describe_target = pq_getmsgstring(&input_message);
4410  pq_getmsgend(&input_message);
4411 
4412  switch (describe_type)
4413  {
4414  case 'S':
4415  exec_describe_statement_message(describe_target);
4416  break;
4417  case 'P':
4418  exec_describe_portal_message(describe_target);
4419  break;
4420  default:
4421  ereport(ERROR,
4422  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4423  errmsg("invalid DESCRIBE message subtype %d",
4424  describe_type)));
4425  break;
4426  }
4427  }
4428  break;
4429 
4430  case 'H': /* flush */
4431  pq_getmsgend(&input_message);
4433  pq_flush();
4434  break;
4435 
4436  case 'S': /* sync */
4437  pq_getmsgend(&input_message);
4439  send_ready_for_query = true;
4440  break;
4441 
4442  /*
4443  * 'X' means that the frontend is closing down the socket. EOF
4444  * means unexpected loss of frontend connection. Either way,
4445  * perform normal shutdown.
4446  */
4447  case 'X':
4448  case EOF:
4449 
4450  /*
4451  * Reset whereToSendOutput to prevent ereport from attempting
4452  * to send any more messages to client.
4453  */
4456 
4457  /*
4458  * NOTE: if you are tempted to add more code here, DON'T!
4459  * Whatever you had in mind to do should be set up as an
4460  * on_proc_exit or on_shmem_exit callback, instead. Otherwise
4461  * it will fail to be called during other backend-shutdown
4462  * scenarios.
4463  */
4464  proc_exit(0);
4465 
4466  case 'd': /* copy data */
4467  case 'c': /* copy done */
4468  case 'f': /* copy fail */
4469 
4470  /*
4471  * Accept but ignore these messages, per protocol spec; we
4472  * probably got here because a COPY failed, and the frontend
4473  * is still sending data.
4474  */
4475  break;
4476 
4477  default:
4478  ereport(FATAL,
4479  (errcode(ERRCODE_PROTOCOL_VIOLATION),
4480  errmsg("invalid frontend message type %d",
4481  firstchar)));
4482  }
4483  } /* end of input-reading loop */
4484 }
void InitializeTimeouts(void)
Definition: timeout.c:340
void AbortCurrentTransaction(void)
Definition: xact.c:3159
static void exec_describe_portal_message(const char *portal_name)
Definition: postgres.c:2518
#define SIGQUIT
Definition: win32_port.h:155
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:6011
int MyProcPid
Definition: globals.c:40
#define pq_flush()
Definition: libpq.h:39
static int ReadCommand(StringInfo inBuf)
Definition: postgres.c:509
static void finish_xact_command(void)
Definition: postgres.c:2590
void ProcessConfigFile(GucContext context)
bool exec_replication_command(const char *cmd_string)
Definition: walsender.c:1431
#define SIGUSR1
Definition: win32_port.h:166
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:3121
#define SIGCHLD
Definition: win32_port.h:164
const char * pq_getmsgstring(StringInfo msg)
Definition: pqformat.c:581
Portal GetPortalByName(const char *name)
Definition: portalmem.c:130
void InitStandaloneProcess(const char *argv0)
Definition: miscinit.c:318
bool IsAbortedTransactionBlockState(void)
Definition: xact.c:376
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
void SPICleanup(void)
Definition: spi.c:349
void set_ps_display(const char *activity, bool force)
Definition: ps_status.c:331
static void forbidden_in_wal_sender(char firstchar)
Definition: postgres.c:4494
void proc_exit(int code)
Definition: ipc.c:104
int errcode(int sqlerrcode)
Definition: elog.c:570
bool IsTransactionOrTransactionBlock(void)
Definition: xact.c:4651
void pq_putemptymessage(char msgtype)
Definition: pqformat.c:390
#define SetProcessingMode(mode)
Definition: miscadmin.h:380
void BaseInit(void)
Definition: postinit.c:548
#define printf(...)
Definition: port.h:198
void checkDataDir(void)
Definition: miscinit.c:99
#define SIGPIPE
Definition: win32_port.h:159
#define SIGUSR2
Definition: win32_port.h:167
unsigned int Oid
Definition: postgres_ext.h:31
const char * progname
Definition: pg_standby.c:37
void FlushErrorState(void)
Definition: elog.c:1574
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
void pq_beginmessage(StringInfo buf, char msgtype)
Definition: pqformat.c:87
void StatementCancelHandler(SIGNAL_ARGS)
Definition: postgres.c:2792
signed int int32
Definition: c.h:346
static void exec_execute_message(const char *portal_name, long max_rows)
Definition: postgres.c:1966
static void log_disconnections(int code, Datum arg)
Definition: postgres.c:4661
void jit_reset_after_error(void)
Definition: jit.c:131
#define RESUME_INTERRUPTS()
Definition: miscadmin.h:118
ErrorContextCallback * error_context_stack
Definition: elog.c:88
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:114
void disable_all_timeouts(bool keep_indicators)
Definition: timeout.c:596
#define ERROR
Definition: elog.h:43
void CreateDataDirLockFile(bool amPostmaster)
Definition: miscinit.c:1177
bool pq_is_reading_msg(void)
Definition: pqcomm.c:1251
int IdleInTransactionSessionTimeout
Definition: proc.c:64
int32 MyCancelKey
Definition: globals.c:44
void WalSndSignals(void)
Definition: walsender.c:3009
#define FATAL
Definition: elog.h:52
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:192
void InitProcess(void)
Definition: proc.c:305
Definition: dest.h:88
static char * buf
Definition: pg_test_fsync.c:68
bool IsUnderPostmaster
Definition: globals.c:109
static void exec_bind_message(StringInfo input_message)
Definition: postgres.c:1596
Definition: dest.h:89
#define SIGHUP
Definition: win32_port.h:154
void PostgresSigHupHandler(SIGNAL_ARGS)
Definition: postgres.c:2832
void LocalProcessControlFile(bool reset)
Definition: xlog.c:4922
void ChangeToDataDir(void)
Definition: miscinit.c:213
void ReplicationSlotRelease(void)
Definition: slot.c:424
sigset_t UnBlockSig
Definition: pqsignal.c:22
void PortalErrorCleanup(void)
Definition: portalmem.c:908
static bool stmt_timeout_active
Definition: postgres.c:151
static bool xact_started
Definition: postgres.c:132
void InitWalSender(void)
#define ereport(elevel, rest)
Definition: elog.h:141
MemoryContext TopMemoryContext
Definition: mcxt.c:44
Definition: guc.h:72
volatile sig_atomic_t ConfigReloadPending
Definition: globals.c:35
#define SIG_IGN
Definition: win32_port.h:151
void initStringInfo(StringInfo str)
Definition: stringinfo.c:46
const char * debug_query_string
Definition: postgres.c:87
#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:1334
#define PortalIsValid(p)
Definition: portal.h:201
static void start_xact_command(void)
Definition: postgres.c:2570
static bool doing_extended_query_message
Definition: postgres.c:145
sigset_t BlockSig
Definition: pqsignal.c:22
void process_session_preload_libraries(void)
Definition: miscinit.c:1596
void WalSndErrorCleanup(void)
Definition: walsender.c:297
bool SelectConfigFiles(const char *userDoption, const char *progname)
Definition: guc.c:5339
void EmitErrorReport(void)
Definition: elog.c:1433
static StringInfoData row_description_buf
Definition: postgres.c:172
TimestampTz PgStartTime
Definition: timestamp.c:49
static char * username
Definition: initdb.c:133
#define InvalidOid
Definition: postgres_ext.h:36
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:428
ReplicationSlot * MyReplicationSlot
Definition: slot.c:96
#define pq_comm_reset()
Definition: libpq.h:38
#define SIG_DFL
Definition: win32_port.h:149
void ProcessCompletedNotifies(void)
Definition: async.c:1225
void HandleFunctionRequest(StringInfo msgBuf)
Definition: fastpath.c:259
void InvalidateCatalogSnapshotConditionally(void)
Definition: snapmgr.c:533
static bool DoingCommandRead
Definition: postgres.c:139
void InitializeMaxBackends(void)
Definition: postinit.c:526
char * dbname
Definition: streamutil.c:52
MemoryContext MessageContext
Definition: mcxt.c:48
sigjmp_buf * PG_exception_stack
Definition: elog.c:90
static const char * userDoption
Definition: postgres.c:161
void SetCurrentStatementStartTimestamp(void)
Definition: xact.c:818
void * palloc(Size size)
Definition: mcxt.c:949
int errmsg(const char *fmt,...)
Definition: elog.c:784
void PortalDrop(Portal portal, bool isTopCommit)
Definition: portalmem.c:465
void ReadyForQuery(CommandDest dest)
Definition: dest.c:250
void pq_endmessage(StringInfo buf)
Definition: pqformat.c:298
void die(SIGNAL_ARGS)
Definition: postgres.c:2761
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:116
int i
void FloatExceptionHandler(SIGNAL_ARGS)
Definition: postgres.c:2813
static void drop_unnamed_stmt(void)
Definition: postgres.c:2669
void ReplicationSlotCleanup(void)
Definition: slot.c:479
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:93
void process_postgres_switches(int argc, char *argv[], GucContext ctx, const char **dbname)
Definition: postgres.c:3468
void pq_getmsgend(StringInfo msg)
Definition: pqformat.c:637
void disable_timeout(TimeoutId id, bool keep_indicator)
Definition: timeout.c:525
void procsignal_sigusr1_handler(SIGNAL_ARGS)
Definition: procsignal.c:261
CommandDest whereToSendOutput
Definition: postgres.c:90
static bool ignore_till_sync
Definition: postgres.c:146
static MemoryContext row_description_context
Definition: postgres.c:171
void quickdie(SIGNAL_ARGS)
Definition: postgres.c:2694
MemoryContext PostmasterContext
Definition: mcxt.c:46
static void exec_simple_query(const char *query_string)
Definition: postgres.c:984
void InitializeGUCOptions(void)
Definition: guc.c:5117
void pgstat_report_stat(bool force)
Definition: pgstat.c:813
void DropPreparedStatement(const char *stmt_name, bool showError)
Definition: prepare.c:570
static void exec_describe_statement_message(const char *stmt_name)
Definition: postgres.c:2423

◆ process_postgres_switches()

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

Definition at line 3468 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().

3470 {
3471  bool secure = (ctx == PGC_POSTMASTER);
3472  int errs = 0;
3473  GucSource gucsource;
3474  int flag;
3475 
3476  if (secure)
3477  {
3478  gucsource = PGC_S_ARGV; /* switches came from command line */
3479 
3480  /* Ignore the initial --single argument, if present */
3481  if (argc > 1 && strcmp(argv[1], "--single") == 0)
3482  {
3483  argv++;
3484  argc--;
3485  }
3486  }
3487  else
3488  {
3489  gucsource = PGC_S_CLIENT; /* switches came from client */
3490  }
3491 
3492 #ifdef HAVE_INT_OPTERR
3493 
3494  /*
3495  * Turn this off because it's either printed to stderr and not the log
3496  * where we'd want it, or argv[0] is now "--single", which would make for
3497  * a weird error message. We print our own error message below.
3498  */
3499  opterr = 0;
3500 #endif
3501 
3502  /*
3503  * Parse command-line options. CAUTION: keep this in sync with
3504  * postmaster/postmaster.c (the option sets should not conflict) and with
3505  * the common help() function in main/main.c.
3506  */
3507  while ((flag = getopt(argc, argv, "B:bc:C:D:d:EeFf:h:ijk:lN:nOo:Pp:r:S:sTt:v:W:-:")) != -1)
3508  {
3509  switch (flag)
3510  {
3511  case 'B':
3512  SetConfigOption("shared_buffers", optarg, ctx, gucsource);
3513  break;
3514 
3515  case 'b':
3516  /* Undocumented flag used for binary upgrades */
3517  if (secure)
3518  IsBinaryUpgrade = true;
3519  break;
3520 
3521  case 'C':
3522  /* ignored for consistency with the postmaster */
3523  break;
3524 
3525  case 'D':
3526  if (secure)
3527  userDoption = strdup(optarg);
3528  break;
3529 
3530  case 'd':
3531  set_debug_options(atoi(optarg), ctx, gucsource);
3532  break;
3533 
3534  case 'E':
3535  if (secure)
3536  EchoQuery = true;
3537  break;
3538 
3539  case 'e':
3540  SetConfigOption("datestyle", "euro", ctx, gucsource);
3541  break;
3542 
3543  case 'F':
3544  SetConfigOption("fsync", "false", ctx, gucsource);
3545  break;
3546 
3547  case 'f':
3548  if (!set_plan_disabling_options(optarg, ctx, gucsource))
3549  errs++;
3550  break;
3551 
3552  case 'h':
3553  SetConfigOption("listen_addresses", optarg, ctx, gucsource);
3554  break;
3555 
3556  case 'i':
3557  SetConfigOption("listen_addresses", "*", ctx, gucsource);
3558  break;
3559 
3560  case 'j':
3561  if (secure)
3562  UseSemiNewlineNewline = true;
3563  break;
3564 
3565  case 'k':
3566  SetConfigOption("unix_socket_directories", optarg, ctx, gucsource);
3567  break;
3568 
3569  case 'l':
3570  SetConfigOption("ssl", "true", ctx, gucsource);
3571  break;
3572 
3573  case 'N':
3574  SetConfigOption("max_connections", optarg, ctx, gucsource);
3575  break;
3576 
3577  case 'n':
3578  /* ignored for consistency with postmaster */
3579  break;
3580 
3581  case 'O':
3582  SetConfigOption("allow_system_table_mods", "true", ctx, gucsource);
3583  break;
3584 
3585  case 'o':
3586  errs++;
3587  break;
3588 
3589  case 'P':
3590  SetConfigOption("ignore_system_indexes", "true", ctx, gucsource);
3591  break;
3592 
3593  case 'p':
3594  SetConfigOption("port", optarg, ctx, gucsource);
3595  break;
3596 
3597  case 'r':
3598  /* send output (stdout and stderr) to the given file */
3599  if (secure)
3601  break;
3602 
3603  case 'S':
3604  SetConfigOption("work_mem", optarg, ctx, gucsource);
3605  break;
3606 
3607  case 's':
3608  SetConfigOption("log_statement_stats", "true", ctx, gucsource);
3609  break;
3610 
3611  case 'T':
3612  /* ignored for consistency with the postmaster */
3613  break;
3614 
3615  case 't':
3616  {
3617  const char *tmp = get_stats_option_name(optarg);
3618 
3619  if (tmp)
3620  SetConfigOption(tmp, "true", ctx, gucsource);
3621  else
3622  errs++;
3623  break;
3624  }
3625 
3626  case 'v':
3627 
3628  /*
3629  * -v is no longer used in normal operation, since
3630  * FrontendProtocol is already set before we get here. We keep
3631  * the switch only for possible use in standalone operation,
3632  * in case we ever support using normal FE/BE protocol with a
3633  * standalone backend.
3634  */
3635  if (secure)
3637  break;
3638 
3639  case 'W':
3640  SetConfigOption("post_auth_delay", optarg, ctx, gucsource);
3641  break;
3642 
3643  case 'c':
3644  case '-':
3645  {
3646  char *name,
3647  *value;
3648 
3649  ParseLongOption(optarg, &name, &value);
3650  if (!value)
3651  {
3652  if (flag == '-')
3653  ereport(ERROR,
3654  (errcode(ERRCODE_SYNTAX_ERROR),
3655  errmsg("--%s requires a value",
3656  optarg)));
3657  else
3658  ereport(ERROR,
3659  (errcode(ERRCODE_SYNTAX_ERROR),
3660  errmsg("-c %s requires a value",
3661  optarg)));
3662  }
3663  SetConfigOption(name, value, ctx, gucsource);
3664  free(name);
3665  if (value)
3666  free(value);
3667  break;
3668  }
3669 
3670  default:
3671  errs++;
3672  break;
3673  }
3674 
3675  if (errs)
3676  break;
3677  }
3678 
3679  /*
3680  * Optional database name should be there only if *dbname is NULL.
3681  */
3682  if (!errs && dbname && *dbname == NULL && argc - optind >= 1)
3683  *dbname = strdup(argv[optind++]);
3684 
3685  if (errs || argc != optind)
3686  {
3687  if (errs)
3688  optind--; /* complain about the previous argument */
3689 
3690  /* spell the error message a bit differently depending on context */
3691  if (IsUnderPostmaster)
3692  ereport(FATAL,
3693  (errcode(ERRCODE_SYNTAX_ERROR),
3694  errmsg("invalid command-line argument for server process: %s", argv[optind]),
3695  errhint("Try \"%s --help\" for more information.", progname)));
3696  else
3697  ereport(FATAL,
3698  (errcode(ERRCODE_SYNTAX_ERROR),
3699  errmsg("%s: invalid command-line argument: %s",
3700  progname, argv[optind]),
3701  errhint("Try \"%s --help\" for more information.", progname)));
3702  }
3703 
3704  /*
3705  * Reset getopt(3) library so that it will work correctly in subprocesses
3706  * or when this function is called a second time with another array.
3707  */
3708  optind = 1;
3709 #ifdef HAVE_INT_OPTRESET
3710  optreset = 1; /* some systems need this too */
3711 #endif
3712 }
int errhint(const char *fmt,...)
Definition: elog.c:974
void ParseLongOption(const char *string, char **name, char **value)
Definition: guc.c:10307
bool set_plan_disabling_options(const char *arg, GucContext context, GucSource source)
Definition: postgres.c:3386
static struct @145 value
int errcode(int sqlerrcode)
Definition: elog.c:570
const char * get_stats_option_name(const char *arg)
Definition: postgres.c:3428
void set_debug_options(int debug_flag, GucContext context, GucSource source)
Definition: postgres.c:3357
const char * progname
Definition: pg_standby.c:37
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:7487
bool IsUnderPostmaster
Definition: globals.c:109
char * flag(int b)
Definition: test-ctype.c:33
int opterr
Definition: getopt.c:49
#define ereport(elevel, rest)
Definition: elog.h:141
uint32 ProtocolVersion
Definition: pqcomm.h:113
#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:52
const char * name
Definition: encode.c:521
static bool EchoQuery
Definition: postgres.c:162
static const char * userDoption
Definition: postgres.c:161
static bool UseSemiNewlineNewline
Definition: postgres.c:163
int errmsg(const char *fmt,...)
Definition: elog.c:784
char * optarg
Definition: getopt.c:52
ProtocolVersion FrontendProtocol
Definition: globals.c:28

◆ ProcessClientReadInterrupt()

void ProcessClientReadInterrupt ( bool  blocked)

Definition at line 530 of file postgres.c.

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

Referenced by interactive_getc(), and secure_read().

531 {
532  int save_errno = errno;
533 
534  if (DoingCommandRead)
535  {
536  /* Check for general interrupts that arrived before/while reading */
538 
539  /* Process sinval catchup interrupts, if any */
542 
543  /* Process notify interrupts, if any */
546  }
547  else if (ProcDiePending)
548  {
549  /*
550  * We're dying. If there is no data available to read, then it's safe
551  * (and sane) to handle that now. If we haven't tried to read yet,
552  * make sure the process latch is set, so that if there is no data
553  * then we'll come back here and die. If we're done reading, also
554  * make sure the process latch is set, as we might've undesirably
555  * cleared it while reading.
556  */
557  if (blocked)
559  else
560  SetLatch(MyLatch);
561  }
562 
563  errno = save_errno;
564 }
void ProcessCatchupInterrupt(void)
Definition: sinval.c:176
void SetLatch(Latch *latch)
Definition: latch.c:436
void ProcessNotifyInterrupt(void)
Definition: async.c:1893
volatile sig_atomic_t ProcDiePending
Definition: globals.c:32
static bool DoingCommandRead
Definition: postgres.c:139
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 576 of file postgres.c.

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

Referenced by secure_write().

577 {
578  int save_errno = errno;
579 
580  if (ProcDiePending)
581  {
582  /*
583  * We're dying. If it's not possible to write, then we should handle
584  * that immediately, else a stuck client could indefinitely delay our
585  * response to the signal. If we haven't tried to write yet, make
586  * sure the process latch is set, so that if the write would block
587  * then we'll come back here and die. If we're done writing, also
588  * make sure the process latch is set, as we might've undesirably
589  * cleared it while writing.
590  */
591  if (blocked)
592  {
593  /*
594  * Don't mess with whereToSendOutput if ProcessInterrupts wouldn't
595  * do anything.
596  */
597  if (InterruptHoldoffCount == 0 && CritSectionCount == 0)
598  {
599  /*
600  * We don't want to send the client the error message, as a)
601  * that would possibly block again, and b) it would likely
602  * lead to loss of protocol sync because we may have already
603  * sent a partial protocol message.
604  */
607 
609  }
610  }
611  else
612  SetLatch(MyLatch);
613  }
614 
615  errno = save_errno;
616 }
volatile uint32 InterruptHoldoffCount
Definition: globals.c:36
void SetLatch(Latch *latch)
Definition: latch.c:436
Definition: dest.h:88
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:90

◆ quickdie()

void quickdie ( SIGNAL_ARGS  )

Definition at line 2694 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().

2695 {
2696  sigaddset(&BlockSig, SIGQUIT); /* prevent nested calls */
2697  PG_SETMASK(&BlockSig);
2698 
2699  /*
2700  * Prevent interrupts while exiting; though we just blocked signals that
2701  * would queue new interrupts, one may have been pending. We don't want a
2702  * quickdie() downgraded to a mere query cancel.
2703  */
2704  HOLD_INTERRUPTS();
2705 
2706  /*
2707  * If we're aborting out of client auth, don't risk trying to send
2708  * anything to the client; we will likely violate the protocol, not to
2709  * mention that we may have interrupted the guts of OpenSSL or some
2710  * authentication library.
2711  */
2714 
2715  /*
2716  * Notify the client before exiting, to give a clue on what happened.
2717  *
2718  * It's dubious to call ereport() from a signal handler. It is certainly
2719  * not async-signal safe. But it seems better to try, than to disconnect
2720  * abruptly and leave the client wondering what happened. It's remotely
2721  * possible that we crash or hang while trying to send the message, but
2722  * receiving a SIGQUIT is a sign that something has already gone badly
2723  * wrong, so there's not much to lose. Assuming the postmaster is still
2724  * running, it will SIGKILL us soon if we get stuck for some reason.
2725  *
2726  * Ideally this should be ereport(FATAL), but then we'd not get control
2727  * back...
2728  */
2729  ereport(WARNING,
2730  (errcode(ERRCODE_CRASH_SHUTDOWN),
2731  errmsg("terminating connection because of crash of another server process"),
2732  errdetail("The postmaster has commanded this server process to roll back"
2733  " the current transaction and exit, because another"
2734  " server process exited abnormally and possibly corrupted"
2735  " shared memory."),
2736  errhint("In a moment you should be able to reconnect to the"
2737  " database and repeat your command.")));
2738 
2739  /*
2740  * We DO NOT want to run proc_exit() or atexit() callbacks -- we're here
2741  * because shared memory may be corrupted, so we don't want to try to
2742  * clean up our transaction. Just nail the windows shut and get out of
2743  * town. The callbacks wouldn't be safe to run from a signal handler,
2744  * anyway.
2745  *
2746  * Note we do _exit(2) not _exit(0). This is to force the postmaster into
2747  * a system reset cycle if someone sends a manual SIGQUIT to a random
2748  * backend. This is necessary precisely because we don't clean up our
2749  * shared memory state. (The "dead man switch" mechanism in pmsignal.c
2750  * should ensure the postmaster sees this as a crash, too, but no harm in
2751  * being doubly sure.)
2752  */
2753  _exit(2);
2754 }
#define SIGQUIT
Definition: win32_port.h:155
int errhint(const char *fmt,...)
Definition: elog.c:974
int errcode(int sqlerrcode)
Definition: elog.c:570
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
bool ClientAuthInProgress
Definition: postmaster.c:352
Definition: dest.h:88
int errdetail(const char *fmt,...)
Definition: elog.c:860
#define ereport(elevel, rest)
Definition: elog.h:141
#define WARNING
Definition: elog.h:40
sigset_t BlockSig
Definition: pqsignal.c:22
int errmsg(const char *fmt,...)
Definition: elog.c:784
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:116
CommandDest whereToSendOutput
Definition: postgres.c:90

◆ RecoveryConflictInterrupt()

void RecoveryConflictInterrupt ( ProcSignalReason  reason)

Definition at line 2849 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().

2850 {
2851  int save_errno = errno;
2852 
2853  /*
2854  * Don't joggle the elbow of proc_exit
2855  */
2856  if (!proc_exit_inprogress)
2857  {
2858  RecoveryConflictReason = reason;
2859  switch (reason)
2860  {
2862 
2863  /*
2864  * If we aren't waiting for a lock we can never deadlock.
2865  */
2866  if (!IsWaitingForLock())
2867  return;
2868 
2869  /* Intentional fall through to check wait for pin */
2870  /* FALLTHROUGH */
2871 
2873 
2874  /*
2875  * If we aren't blocking the Startup process there is nothing
2876  * more to do.
2877  */
2879  return;
2880 
2882 
2883  /* Intentional fall through to error handling */
2884  /* FALLTHROUGH */
2885 
2889 
2890  /*
2891  * If we aren't in a transaction any longer then ignore.
2892  */
2894  return;
2895 
2896  /*
2897  * If we can abort just the current subtransaction then we are
2898  * OK to throw an ERROR to resolve the conflict. Otherwise
2899  * drop through to the FATAL case.
2900  *
2901  * XXX other times that we can throw just an ERROR *may* be
2902  * PROCSIG_RECOVERY_CONFLICT_LOCK if no locks are held in
2903  * parent transactions
2904  *
2905  * PROCSIG_RECOVERY_CONFLICT_SNAPSHOT if no snapshots are held
2906  * by parent transactions and the transaction is not
2907  * transaction-snapshot mode
2908  *
2909  * PROCSIG_RECOVERY_CONFLICT_TABLESPACE if no temp files or
2910  * cursors open in parent transactions
2911  */
2912  if (!IsSubTransaction())
2913  {
2914  /*
2915  * If we already aborted then we no longer need to cancel.
2916  * We do this here since we do not wish to ignore aborted
2917  * subtransactions, which must cause FATAL, currently.
2918  */
2920  return;
2921 
2922  RecoveryConflictPending = true;
2923  QueryCancelPending = true;
2924  InterruptPending = true;
2925  break;
2926  }
2927 
2928  /* Intentional fall through to session cancel */
2929  /* FALLTHROUGH */
2930 
2932  RecoveryConflictPending = true;
2933  ProcDiePending = true;
2934  InterruptPending = true;
2935  break;
2936 
2937  default:
2938  elog(FATAL, "unrecognized conflict mode: %d",
2939  (int) reason);
2940  }
2941 
2943 
2944  /*
2945  * All conflicts apart from database cause dynamic errors where the
2946  * command or transaction can be retried at a later point with some
2947  * potential for success. No need to reset this, since non-retryable
2948  * conflict errors are currently FATAL.
2949  */
2950  if (reason == PROCSIG_RECOVERY_CONFLICT_DATABASE)
2951  RecoveryConflictRetryable = false;
2952  }
2953 
2954  /*
2955  * Set the process latch. This function essentially emulates signal
2956  * handlers like die() and StatementCancelHandler() and it seems prudent
2957  * to behave similarly as they do.
2958  */
2959  SetLatch(MyLatch);
2960 
2961  errno = save_errno;
2962 }
bool IsWaitingForLock(void)
Definition: proc.c:695
volatile sig_atomic_t QueryCancelPending
Definition: globals.c:31
PGPROC * MyProc
Definition: proc.c:68
bool IsAbortedTransactionBlockState(void)
Definition: xact.c:376
bool IsTransactionOrTransactionBlock(void)
Definition: xact.c:4651
void SetLatch(Latch *latch)
Definition: latch.c:436
#define FATAL
Definition: elog.h:52
bool recoveryConflictPending
Definition: proc.h:127
static ProcSignalReason RecoveryConflictReason
Definition: postgres.c:168
static bool RecoveryConflictPending
Definition: postgres.c:166
static bool RecoveryConflictRetryable
Definition: postgres.c:167
#define Assert(condition)
Definition: c.h:732
volatile sig_atomic_t ProcDiePending
Definition: globals.c:32
bool proc_exit_inprogress
Definition: ipc.c:40
bool HoldingBufferPinThatDelaysRecovery(void)
Definition: bufmgr.c:3748
volatile sig_atomic_t InterruptPending
Definition: globals.c:30
bool IsSubTransaction(void)
Definition: xact.c:4706
#define elog(elevel,...)
Definition: elog.h:226
struct Latch * MyLatch
Definition: globals.c:54

◆ ResetUsage()

void ResetUsage ( void  )

Definition at line 4552 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().

4553 {
4555  gettimeofday(&Save_t, NULL);
4556 }
int gettimeofday(struct timeval *tp, struct timezone *tzp)
Definition: gettimeofday.c:105
static struct rusage Save_r
Definition: postgres.c:4548
int getrusage(int who, struct rusage *rusage)
Definition: getrusage.c:31
static struct timeval Save_t
Definition: postgres.c:4549
#define RUSAGE_SELF
Definition: rusagestub.h:23

◆ set_debug_options()

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

Definition at line 3357 of file postgres.c.

References PGC_POSTMASTER, SetConfigOption(), and sprintf.

Referenced by PostmasterMain(), and process_postgres_switches().

3358 {
3359  if (debug_flag > 0)
3360  {
3361  char debugstr[64];
3362 
3363  sprintf(debugstr, "debug%d", debug_flag);
3364  SetConfigOption("log_min_messages", debugstr, context, source);
3365  }
3366  else
3367  SetConfigOption("log_min_messages", "notice", context, source);
3368 
3369  if (debug_flag >= 1 && context == PGC_POSTMASTER)
3370  {
3371  SetConfigOption("log_connections", "true", context, source);
3372  SetConfigOption("log_disconnections", "true", context, source);
3373  }
3374  if (debug_flag >= 2)
3375  SetConfigOption("log_statement", "all", context, source);
3376  if (debug_flag >= 3)
3377  SetConfigOption("debug_print_parse", "true", context, source);
3378  if (debug_flag >= 4)
3379  SetConfigOption("debug_print_plan", "true", context, source);
3380  if (debug_flag >= 5)
3381  SetConfigOption("debug_print_rewritten", "true", context, source);
3382 }
#define sprintf
Definition: port.h:194
void SetConfigOption(const char *name, const char *value, GucContext context, GucSource source)
Definition: guc.c:7487

◆ set_plan_disabling_options()

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

Definition at line 3386 of file postgres.c.

References SetConfigOption().

Referenced by PostmasterMain(), and process_postgres_switches().

3387 {
3388  const char *tmp = NULL;
3389 
3390  switch (arg[0])
3391  {
3392  case 's': /* seqscan */
3393  tmp = "enable_seqscan";
3394  break;
3395  case 'i': /* indexscan */
3396  tmp = "enable_indexscan";
3397  break;
3398  case 'o': /* indexonlyscan */
3399  tmp = "enable_indexonlyscan";
3400  break;
3401  case 'b': /* bitmapscan */
3402  tmp = "enable_bitmapscan";
3403  break;
3404  case 't': /* tidscan */
3405  tmp = "enable_tidscan";
3406  break;
3407  case 'n': /* nestloop */
3408  tmp = "enable_nestloop";
3409  break;
3410  case 'm': /* mergejoin */
3411  tmp = "enable_mergejoin";
3412  break;
3413  case 'h': /* hashjoin */
3414  tmp = "enable_hashjoin";
3415  break;
3416  }
3417  if (tmp)
3418  {
3419  SetConfigOption(tmp, "false", context, source);
3420  return true;
3421  }
3422  else
3423  return false;
3424 }
void SetConfigOption(const char *name, const char *value, GucContext context, GucSource source)
Definition: guc.c:7487
void * arg

◆ ShowUsage()

void ShowUsage ( const char *  title)

Definition at line 4559 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().

4560 {
4562  struct timeval user,
4563  sys;
4564  struct timeval elapse_t;
4565  struct rusage r;
4566 
4567  getrusage(RUSAGE_SELF, &r);
4568  gettimeofday(&elapse_t, NULL);
4569  memcpy((char *) &user, (char *) &r.ru_utime, sizeof(user));
4570  memcpy((char *) &sys, (char *) &r.ru_stime, sizeof(sys));
4571  if (elapse_t.tv_usec < Save_t.tv_usec)
4572  {
4573  elapse_t.tv_sec--;
4574  elapse_t.tv_usec += 1000000;
4575  }
4576  if (r.ru_utime.tv_usec < Save_r.ru_utime.tv_usec)
4577  {
4578  r.ru_utime.tv_sec--;
4579  r.ru_utime.tv_usec += 1000000;
4580  }
4581  if (r.ru_stime.tv_usec < Save_r.ru_stime.tv_usec)
4582  {
4583  r.ru_stime.tv_sec--;
4584  r.ru_stime.tv_usec += 1000000;
4585  }
4586 
4587  /*
4588  * The only stats we don't show here are ixrss, idrss, isrss. It takes
4589  * some work to interpret them, and most platforms don't fill them in.
4590  */
4591  initStringInfo(&str);
4592 
4593  appendStringInfoString(&str, "! system usage stats:\n");
4594  appendStringInfo(&str,
4595  "!\t%ld.%06ld s user, %ld.%06ld s system, %ld.%06ld s elapsed\n",
4596  (long) (r.ru_utime.tv_sec - Save_r.ru_utime.tv_sec),
4597  (long) (r.ru_utime.tv_usec - Save_r.ru_utime.tv_usec),
4598  (long) (r.ru_stime.tv_sec - Save_r.ru_stime.tv_sec),
4599  (long) (r.ru_stime.tv_usec - Save_r.ru_stime.tv_usec),
4600  (long) (elapse_t.tv_sec - Save_t.tv_sec),
4601  (long) (elapse_t.tv_usec - Save_t.tv_usec));
4602  appendStringInfo(&str,
4603  "!\t[%ld.%06ld s user, %ld.%06ld s system total]\n",
4604  (long) user.tv_sec,
4605  (long) user.tv_usec,
4606  (long) sys.tv_sec,
4607  (long) sys.tv_usec);
4608 #if defined(HAVE_GETRUSAGE)
4609  appendStringInfo(&str,
4610  "!\t%ld kB max resident size\n",
4611 #if defined(__darwin__)
4612  /* in bytes on macOS */
4613  r.ru_maxrss / 1024
4614 #else
4615  /* in kilobytes on most other platforms */
4616  r.ru_maxrss
4617 #endif
4618  );
4619  appendStringInfo(&str,
4620  "!\t%ld/%ld [%ld/%ld] filesystem blocks in/out\n",
4621  r.ru_inblock - Save_r.ru_inblock,
4622  /* they only drink coffee at dec */
4623  r.ru_oublock - Save_r.ru_oublock,
4624  r.ru_inblock, r.ru_oublock);
4625  appendStringInfo(&str,
4626  "!\t%ld/%ld [%ld/%ld] page faults/reclaims, %ld [%ld] swaps\n",
4627  r.ru_majflt - Save_r.ru_majflt,
4628  r.ru_minflt - Save_r.ru_minflt,
4629  r.ru_majflt, r.ru_minflt,
4630  r.ru_nswap - Save_r.ru_nswap,
4631  r.ru_nswap);
4632  appendStringInfo(&str,
4633  "!\t%ld [%ld] signals rcvd, %ld/%ld [%ld/%ld] messages rcvd/sent\n",
4634  r.ru_nsignals - Save_r.ru_nsignals,
4635  r.ru_nsignals,
4636  r.ru_msgrcv - Save_r.ru_msgrcv,
4637  r.ru_msgsnd - Save_r.ru_msgsnd,
4638  r.ru_msgrcv, r.ru_msgsnd);
4639  appendStringInfo(&str,
4640  "!\t%ld/%ld [%ld/%ld] voluntary/involuntary context switches\n",
4641  r.ru_nvcsw - Save_r.ru_nvcsw,
4642  r.ru_nivcsw - Save_r.ru_nivcsw,
4643  r.ru_nvcsw, r.ru_nivcsw);
4644 #endif /* HAVE_GETRUSAGE */
4645 
4646  /* remove trailing newline */
4647  if (str.data[str.len - 1] == '\n')
4648  str.data[--str.len] = '\0';
4649 
4650  ereport(LOG,
4651  (errmsg_internal("%s", title),
4652  errdetail_internal("%s", str.data)));
4653 
4654  pfree(str.data);
4655 }
int gettimeofday(struct timeval *tp, struct timezone *tzp)
Definition: gettimeofday.c:105
static struct rusage Save_r
Definition: postgres.c:4548
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:887
void pfree(void *pointer)
Definition: mcxt.c:1056
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:78
void appendStringInfoString(StringInfo str, const char *s)
Definition: stringinfo.c:163
static struct timeval Save_t
Definition: postgres.c:4549
#define ereport(elevel, rest)
Definition: elog.h:141
void initStringInfo(StringInfo str)
Definition: stringinfo.c:46
struct timeval ru_utime
Definition: rusagestub.h:28
#define RUSAGE_SELF
Definition: rusagestub.h:23
int errmsg_internal(const char *fmt,...)
Definition: elog.c:814
static char * user
Definition: pg_regress.c:95
#define __darwin__
Definition: darwin.h:3

◆ StatementCancelHandler()

void StatementCancelHandler ( SIGNAL_ARGS  )

Definition at line 2792 of file postgres.c.

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

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

2793 {
2794  int save_errno = errno;
2795 
2796  /*
2797  * Don't joggle the elbow of proc_exit
2798  */
2799  if (!proc_exit_inprogress)
2800  {
2801  InterruptPending = true;
2802  QueryCancelPending = true;
2803  }
2804 
2805  /* If we're still here, waken anything waiting on the process latch */
2806  SetLatch(MyLatch);
2807 
2808  errno = save_errno;
2809 }
volatile sig_atomic_t QueryCancelPending
Definition: globals.c:31
void SetLatch(Latch *latch)
Definition: latch.c:436
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 95 of file postgres.c.

Referenced by check_log_statement(), and HandleFunctionRequest().

◆ max_stack_depth

int max_stack_depth

Definition at line 98 of file postgres.c.

Referenced by check_stack_depth().

◆ PostAuthDelay

int PostAuthDelay

◆ whereToSendOutput