* postgres.c
* POSTGRES C Backend Interface
*
- * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.405 2004/05/13 22:45:03 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.455 2005/07/21 03:56:11 momjian Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
#include <unistd.h>
#include <signal.h>
-#include <time.h>
-#include <sys/time.h>
#include <fcntl.h>
#include <sys/socket.h>
-#include <errno.h>
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include "storage/ipc.h"
#include "storage/pg_shmem.h"
#include "storage/proc.h"
+#include "storage/sinval.h"
#include "tcop/fastpath.h"
#include "tcop/pquery.h"
#include "tcop/tcopprot.h"
#include "tcop/utility.h"
+#include "utils/flatfiles.h"
#include "utils/guc.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
/* Note: whereToSendOutput is initialized for the bootstrap/standalone case */
CommandDest whereToSendOutput = Debug;
-/* note: these declarations had better match tcopprot.h */
-sigjmp_buf Warn_restart;
-
-bool Warn_restart_ready = false;
-bool InError = false;
-
/* flag for logging end of session */
-bool Log_disconnections = false;
+bool Log_disconnections = false;
LogStmtLevel log_statement = LOGSTMT_NONE;
*/
/* max_stack_depth converted to bytes for speed of checking */
-static int max_stack_depth_bytes = 2048*1024;
+static int max_stack_depth_bytes = 2048 * 1024;
/* stack base pointer (initialized by PostgresMain) */
static char *stack_base_ptr = NULL;
* will reread the configuration file. (Better than doing the
* reading in the signal handler, ey?)
*/
-static volatile bool got_SIGHUP = false;
+static volatile sig_atomic_t got_SIGHUP = false;
/*
* Flag to keep track of whether we have started a transaction.
*/
static bool xact_started = false;
+/*
+ * Flag to indicate that we are doing the outer loop's read-from-client,
+ * as opposed to any random read from client that might happen within
+ * commands like COPY FROM STDIN.
+ */
+static bool DoingCommandRead = false;
+
/*
* Flags to implement skip-till-Sync-after-error behavior for messages of
* the extended query protocol.
static int InteractiveBackend(StringInfo inBuf);
static int SocketBackend(StringInfo inBuf);
static int ReadCommand(StringInfo inBuf);
+static bool log_after_parse(List *raw_parsetree_list,
+ const char *query_string, char **prepare_string);
+static List *pg_rewrite_queries(List *querytree_list);
static void start_xact_command(void);
static void finish_xact_command(void);
static void SigHupHandler(SIGNAL_ARGS);
return result;
}
+/*
+ * prepare_for_client_read -- set up to possibly block on client input
+ *
+ * This must be called immediately before any low-level read from the
+ * client connection. It is necessary to do it at a sufficiently low level
+ * that there won't be any other operations except the read kernel call
+ * itself between this call and the subsequent client_read_ended() call.
+ * In particular there mustn't be use of malloc() or other potentially
+ * non-reentrant libc functions. This restriction makes it safe for us
+ * to allow interrupt service routines to execute nontrivial code while
+ * we are waiting for input.
+ */
+void
+prepare_for_client_read(void)
+{
+ if (DoingCommandRead)
+ {
+ /* Enable immediate processing of asynchronous signals */
+ EnableNotifyInterrupt();
+ EnableCatchupInterrupt();
+
+ /* Allow "die" interrupt to be processed while waiting */
+ ImmediateInterruptOK = true;
+
+ /* And don't forget to detect one that already arrived */
+ QueryCancelPending = false;
+ CHECK_FOR_INTERRUPTS();
+ }
+}
+
+/*
+ * client_read_ended -- get out of the client-input state
+ */
+void
+client_read_ended(void)
+{
+ if (DoingCommandRead)
+ {
+ ImmediateInterruptOK = false;
+ QueryCancelPending = false; /* forget any CANCEL signal */
+
+ DisableNotifyInterrupt();
+ DisableCatchupInterrupt();
+ }
+}
+
/*
* Parse a query string and pass it through the rewriter.
{
List *raw_parsetree_list;
List *querytree_list;
- List *list_item;
+ ListCell *list_item;
/*
* (1) parse the request string into a list of raw parse trees.
{
Node *parsetree = (Node *) lfirst(list_item);
- querytree_list = nconc(querytree_list,
- pg_analyze_and_rewrite(parsetree,
- paramTypes,
- numParams));
+ querytree_list = list_concat(querytree_list,
+ pg_analyze_and_rewrite(parsetree,
+ paramTypes,
+ numParams));
}
return querytree_list;
List *
pg_parse_query(const char *query_string)
{
- List *raw_parsetree_list,
- *parsetree_item;
-
- if (log_statement == LOGSTMT_ALL)
- ereport(LOG,
- (errmsg("statement: %s", query_string)));
+ List *raw_parsetree_list;
if (log_parser_stats)
ResetUsage();
raw_parsetree_list = raw_parser(query_string);
- /* do log_statement tests for mod and ddl */
- if (log_statement == LOGSTMT_MOD ||
- log_statement == LOGSTMT_DDL)
+ if (log_parser_stats)
+ ShowUsage("PARSER STATISTICS");
+
+ return raw_parsetree_list;
+}
+
+static bool
+log_after_parse(List *raw_parsetree_list, const char *query_string,
+ char **prepare_string)
+{
+ ListCell *parsetree_item;
+ bool log_this_statement = (log_statement == LOGSTMT_ALL);
+
+ *prepare_string = NULL;
+
+ /* Check if we need to log the statement, and get prepare_string. */
+ foreach(parsetree_item, raw_parsetree_list)
{
- foreach(parsetree_item, raw_parsetree_list)
+ Node *parsetree = (Node *) lfirst(parsetree_item);
+ const char *commandTag;
+
+ if (IsA(parsetree, ExplainStmt) &&
+ ((ExplainStmt *) parsetree)->analyze)
+ parsetree = (Node *) (((ExplainStmt *) parsetree)->query);
+
+ if (IsA(parsetree, PrepareStmt))
+ parsetree = (Node *) (((PrepareStmt *) parsetree)->query);
+
+ if (IsA(parsetree, SelectStmt) &&
+ ((SelectStmt *) parsetree)->into == NULL)
+ continue; /* optimization for frequent command */
+
+ if (log_statement == LOGSTMT_MOD &&
+ (IsA(parsetree, InsertStmt) ||
+ IsA(parsetree, UpdateStmt) ||
+ IsA(parsetree, DeleteStmt) ||
+ IsA(parsetree, TruncateStmt) ||
+ (IsA(parsetree, CopyStmt) &&
+ ((CopyStmt *) parsetree)->is_from))) /* COPY FROM */
+ log_this_statement = true;
+
+ commandTag = CreateCommandTag(parsetree);
+ if ((log_statement == LOGSTMT_MOD ||
+ log_statement == LOGSTMT_DDL) &&
+ (strncmp(commandTag, "CREATE ", strlen("CREATE ")) == 0 ||
+ IsA(parsetree, SelectStmt) || /* SELECT INTO, CREATE AS */
+ strncmp(commandTag, "ALTER ", strlen("ALTER ")) == 0 ||
+ strncmp(commandTag, "DROP ", strlen("DROP ")) == 0 ||
+ IsA(parsetree, GrantStmt) || /* GRANT or REVOKE */
+ IsA(parsetree, CommentStmt)))
+ log_this_statement = true;
+
+ /*
+ * For the first EXECUTE we find, record the client statement
+ * used by the PREPARE.
+ */
+ if (IsA(parsetree, ExecuteStmt))
{
- Node *parsetree = (Node *) lfirst(parsetree_item);
- const char *commandTag;
-
- if (IsA(parsetree, ExplainStmt) &&
- ((ExplainStmt *)parsetree)->analyze)
- parsetree = (Node *)(((ExplainStmt *)parsetree)->query);
-
- if (IsA(parsetree, PrepareStmt))
- parsetree = (Node *)(((PrepareStmt *)parsetree)->query);
-
- if (IsA(parsetree, SelectStmt))
- continue; /* optimization for frequent command */
-
- if (log_statement == LOGSTMT_MOD &&
- (IsA(parsetree, InsertStmt) ||
- IsA(parsetree, UpdateStmt) ||
- IsA(parsetree, DeleteStmt) ||
- IsA(parsetree, TruncateStmt) ||
- (IsA(parsetree, CopyStmt) &&
- ((CopyStmt *)parsetree)->is_from))) /* COPY FROM */
- {
- ereport(LOG,
- (errmsg("statement: %s", query_string)));
- break;
- }
- commandTag = CreateCommandTag(parsetree);
- if (strncmp(commandTag, "CREATE ", strlen("CREATE ")) == 0 ||
- strncmp(commandTag, "ALTER ", strlen("ALTER ")) == 0 ||
- strncmp(commandTag, "DROP ", strlen("DROP ")) == 0 ||
- IsA(parsetree, GrantStmt) || /* GRANT or REVOKE */
- IsA(parsetree, CommentStmt))
+ ExecuteStmt *stmt = (ExecuteStmt *) parsetree;
+ PreparedStatement *entry;
+
+ if ((entry = FetchPreparedStatement(stmt->name, false)) != NULL &&
+ entry->query_string)
{
- ereport(LOG,
- (errmsg("statement: %s", query_string)));
- break;
+ *prepare_string = palloc(strlen(entry->query_string) +
+ strlen(" [client PREPARE: %s]") - 1);
+ sprintf(*prepare_string, " [client PREPARE: %s]",
+ entry->query_string);
}
}
}
-
- if (log_parser_stats)
- ShowUsage("PARSER STATISTICS");
-
- return raw_parsetree_list;
+
+ if (log_this_statement)
+ {
+ ereport(LOG,
+ (errmsg("statement: %s%s", query_string,
+ *prepare_string ? *prepare_string : "")));
+ return true;
+ }
+ else
+ return false;
}
+
/*
* Given a raw parsetree (gram.y output), and optionally information about
* types of parameter symbols ($n), perform parse analysis and rule rewriting.
/*
* Perform rewriting of a list of queries produced by parse analysis.
+ *
+ * Note: queries must just have come from the parser, because we do not do
+ * AcquireRewriteLocks() on them.
*/
-List *
+static List *
pg_rewrite_queries(List *querytree_list)
{
List *new_list = NIL;
- List *list_item;
+ ListCell *list_item;
if (log_parser_stats)
ResetUsage();
/* rewrite regular queries */
List *rewritten = QueryRewrite(querytree);
- new_list = nconc(new_list, rewritten);
+ new_list = list_concat(new_list, rewritten);
}
}
/* Generate a plan for a single already-rewritten query. */
Plan *
-pg_plan_query(Query *querytree)
+pg_plan_query(Query *querytree, ParamListInfo boundParams)
{
Plan *plan;
ResetUsage();
/* call the optimizer */
- plan = planner(querytree, false, 0);
+ plan = planner(querytree, false, 0, boundParams);
if (log_planner_stats)
ShowUsage("PLANNER STATISTICS");
* statements in the rewriter's output.)
*/
List *
-pg_plan_queries(List *querytrees, bool needSnapshot)
+pg_plan_queries(List *querytrees, ParamListInfo boundParams,
+ bool needSnapshot)
{
List *plan_list = NIL;
- List *query_list;
+ ListCell *query_list;
foreach(query_list, querytrees)
{
{
if (needSnapshot)
{
- SetQuerySnapshot();
+ ActiveSnapshot = CopySnapshot(GetTransactionSnapshot());
needSnapshot = false;
}
- plan = pg_plan_query(query);
+ plan = pg_plan_query(query, boundParams);
}
plan_list = lappend(plan_list, plan);
{
CommandDest dest = whereToSendOutput;
MemoryContext oldcontext;
- List *parsetree_list,
- *parsetree_item;
- struct timeval start_t,
- stop_t;
+ List *parsetree_list;
+ ListCell *parsetree_item;
+ struct timeval start_t, stop_t;
bool save_log_duration = log_duration;
int save_log_min_duration_statement = log_min_duration_statement;
bool save_log_statement_stats = log_statement_stats;
-
+ char *prepare_string = NULL;
+ bool was_logged = false;
+
/*
* Report query to various monitoring facilities.
*/
*/
parsetree_list = pg_parse_query(query_string);
+ if (log_statement != LOGSTMT_NONE || save_log_min_duration_statement != -1)
+ was_logged = log_after_parse(parsetree_list, query_string,
+ &prepare_string);
+
/*
* Switch back to transaction context to enter the loop.
*/
TransactionStmt *stmt = (TransactionStmt *) parsetree;
if (stmt->kind == TRANS_STMT_COMMIT ||
- stmt->kind == TRANS_STMT_ROLLBACK)
+ stmt->kind == TRANS_STMT_PREPARE ||
+ stmt->kind == TRANS_STMT_ROLLBACK ||
+ stmt->kind == TRANS_STMT_ROLLBACK_TO)
allowit = true;
}
ereport(ERROR,
(errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
errmsg("current transaction is aborted, "
- "commands ignored until end of transaction block")));
+ "commands ignored until end of transaction block")));
}
/* Make sure we are in a transaction command */
querytree_list = pg_analyze_and_rewrite(parsetree, NULL, 0);
- plantree_list = pg_plan_queries(querytree_list, true);
+ plantree_list = pg_plan_queries(querytree_list, NULL, true);
/* If we got a cancel signal in analysis or planning, quit */
CHECK_FOR_INTERRUPTS();
/*
* Start the portal. No parameters here.
*/
- PortalStart(portal, NULL);
+ PortalStart(portal, NULL, InvalidSnapshot);
/*
* Select the appropriate output format: text unless we are doing
*/
finish_xact_command();
}
- else if (lnext(parsetree_item) == NIL)
+ else if (lnext(parsetree_item) == NULL)
{
/*
* If this is the last parsetree of the query string, close
stop_t.tv_sec--;
stop_t.tv_usec += 1000000;
}
- usecs = (long) (stop_t.tv_sec - start_t.tv_sec) * 1000000 + (long) (stop_t.tv_usec - start_t.tv_usec);
+ usecs = (long) (stop_t.tv_sec - start_t.tv_sec) * 1000000 +
+ (long) (stop_t.tv_usec - start_t.tv_usec);
- if (save_log_duration)
+ /* Only print duration if we previously printed the statement. */
+ if (was_logged && save_log_duration)
ereport(LOG,
(errmsg("duration: %ld.%03ld ms",
- (long) ((stop_t.tv_sec - start_t.tv_sec) * 1000 +
- (stop_t.tv_usec - start_t.tv_usec) / 1000),
- (long) (stop_t.tv_usec - start_t.tv_usec) % 1000)));
+ (long) ((stop_t.tv_sec - start_t.tv_sec) * 1000 +
+ (stop_t.tv_usec - start_t.tv_usec) / 1000),
+ (long) (stop_t.tv_usec - start_t.tv_usec) % 1000)));
/*
- * Output a duration_statement to the log if the query has exceeded
- * the min duration, or if we are to print all durations.
+ * Output a duration_statement to the log if the query has
+ * exceeded the min duration, or if we are to print all durations.
*/
if (save_log_min_duration_statement == 0 ||
(save_log_min_duration_statement > 0 &&
usecs >= save_log_min_duration_statement * 1000))
ereport(LOG,
- (errmsg("duration: %ld.%03ld ms statement: %s",
- (long) ((stop_t.tv_sec - start_t.tv_sec) * 1000 +
- (stop_t.tv_usec - start_t.tv_usec) / 1000),
- (long) (stop_t.tv_usec - start_t.tv_usec) % 1000,
- query_string)));
+ (errmsg("duration: %ld.%03ld ms statement: %s%s",
+ (long) ((stop_t.tv_sec - start_t.tv_sec) * 1000 +
+ (stop_t.tv_usec - start_t.tv_usec) / 1000),
+ (long) (stop_t.tv_usec - start_t.tv_usec) % 1000,
+ query_string,
+ prepare_string ? prepare_string : "")));
}
if (save_log_statement_stats)
ShowUsage("QUERY STATISTICS");
+ if (prepare_string != NULL)
+ pfree(prepare_string);
+
debug_query_string = NULL;
}
if (save_log_statement_stats)
ResetUsage();
+ if (log_statement == LOGSTMT_ALL)
+ ereport(LOG,
+ (errmsg("statement: PREPARE %s AS %s", stmt_name, query_string)));
+
/*
* Start up a transaction command so we can run parse analysis etc.
* (Note that this will normally change current memory context.)
* is mainly to keep the protocol simple --- otherwise we'd need to
* worry about multiple result tupdescs and things like that.
*/
- if (length(parsetree_list) > 1)
+ if (list_length(parsetree_list) > 1)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("cannot insert multiple commands into a prepared statement")));
if (parsetree_list != NIL)
{
- Node *parsetree = (Node *) lfirst(parsetree_list);
+ Node *parsetree = (Node *) linitial(parsetree_list);
int i;
/*
TransactionStmt *stmt = (TransactionStmt *) parsetree;
if (stmt->kind == TRANS_STMT_COMMIT ||
- stmt->kind == TRANS_STMT_ROLLBACK)
+ stmt->kind == TRANS_STMT_PREPARE ||
+ stmt->kind == TRANS_STMT_ROLLBACK ||
+ stmt->kind == TRANS_STMT_ROLLBACK_TO)
allowit = true;
}
ereport(ERROR,
(errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
errmsg("current transaction is aborted, "
- "commands ignored until end of transaction block")));
+ "commands ignored until end of transaction block")));
}
/*
if (ptype == InvalidOid || ptype == UNKNOWNOID)
ereport(ERROR,
(errcode(ERRCODE_INDETERMINATE_DATATYPE),
- errmsg("could not determine data type of parameter $%d",
- i + 1)));
- param_list = lappendo(param_list, ptype);
+ errmsg("could not determine data type of parameter $%d",
+ i + 1)));
+ param_list = lappend_oid(param_list, ptype);
}
if (log_parser_stats)
querytree_list = pg_rewrite_queries(querytree_list);
- plantree_list = pg_plan_queries(querytree_list, true);
+ /*
+ * If this is the unnamed statement and it has parameters, defer
+ * query planning until Bind. Otherwise do it now.
+ */
+ if (!is_named && numParams > 0)
+ plantree_list = NIL;
+ else
+ plantree_list = pg_plan_queries(querytree_list, NULL, true);
}
else
{
PreparedStatement *pstmt;
Portal portal;
ParamListInfo params;
+ bool isaborted = IsAbortedTransactionBlockState();
pgstat_report_activity("<BIND>");
errmsg("unnamed prepared statement does not exist")));
}
- if (numParams != length(pstmt->argtype_list))
+ if (numParams != list_length(pstmt->argtype_list))
ereport(ERROR,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("bind message supplies %d parameters, but prepared statement \"%s\" requires %d",
- numParams, stmt_name, length(pstmt->argtype_list))));
+ numParams, stmt_name, list_length(pstmt->argtype_list))));
/*
* Create the portal. Allow silent replacement of an existing portal
else
portal = CreatePortal(portal_name, false, false);
- PortalDefineQuery(portal,
- pstmt->query_string,
- pstmt->commandTag,
- pstmt->query_list,
- pstmt->plan_list,
- pstmt->context);
+ if (log_statement == LOGSTMT_ALL)
+ ereport(LOG,
+ (errmsg("statement: <BIND> %s", portal_name)));
/*
* Fetch parameters, if any, and store in the portal's memory context.
*/
if (numParams > 0)
{
- bool isaborted = IsAbortedTransactionBlockState();
- List *l;
+ ListCell *l;
MemoryContext oldContext;
oldContext = MemoryContextSwitchTo(PortalGetHeapMemory(portal));
i = 0;
foreach(l, pstmt->argtype_list)
{
- Oid ptype = lfirsto(l);
+ Oid ptype = lfirst_oid(l);
int32 plength;
bool isNull;
if (pformat == 0)
{
- Oid typInput;
- Oid typElem;
+ Oid typinput;
+ Oid typioparam;
char *pstring;
- getTypeInputInfo(ptype, &typInput, &typElem);
+ getTypeInputInfo(ptype, &typinput, &typioparam);
/*
* We have to do encoding conversion before
pg_client_to_server((unsigned char *) pbuf.data,
plength);
params[i].value =
- OidFunctionCall3(typInput,
+ OidFunctionCall3(typinput,
CStringGetDatum(pstring),
- ObjectIdGetDatum(typElem),
+ ObjectIdGetDatum(typioparam),
Int32GetDatum(-1));
/* Free result of encoding conversion, if any */
if (pstring != pbuf.data)
}
else if (pformat == 1)
{
- Oid typReceive;
- Oid typElem;
+ Oid typreceive;
+ Oid typioparam;
/*
* Call the parameter type's binary input
* converter
*/
- getTypeBinaryInputInfo(ptype, &typReceive, &typElem);
+ getTypeBinaryInputInfo(ptype, &typreceive, &typioparam);
params[i].value =
- OidFunctionCall2(typReceive,
+ OidFunctionCall3(typreceive,
PointerGetDatum(&pbuf),
- ObjectIdGetDatum(typElem));
+ ObjectIdGetDatum(typioparam),
+ Int32GetDatum(-1));
/* Trouble if it didn't eat the whole buffer */
if (pbuf.cursor != pbuf.len)
params[i].kind = PARAM_NUM;
params[i].id = i + 1;
+ params[i].ptype = ptype;
params[i].isnull = isNull;
i++;
pq_getmsgend(input_message);
/*
- * Start portal execution.
+ * If we didn't plan the query before, do it now. This allows the
+ * planner to make use of the concrete parameter values we now have.
+ *
+ * This happens only for unnamed statements, and so switching into the
+ * statement context for planning is correct (see notes in
+ * exec_parse_message).
+ */
+ if (pstmt->plan_list == NIL && pstmt->query_list != NIL &&
+ !isaborted)
+ {
+ MemoryContext oldContext = MemoryContextSwitchTo(pstmt->context);
+
+ pstmt->plan_list = pg_plan_queries(pstmt->query_list, params, true);
+ MemoryContextSwitchTo(oldContext);
+ }
+
+ /*
+ * Define portal and start execution.
*/
- PortalStart(portal, params);
+ PortalDefineQuery(portal,
+ pstmt->query_string,
+ pstmt->commandTag,
+ pstmt->query_list,
+ pstmt->plan_list,
+ pstmt->context);
+
+ PortalStart(portal, params, InvalidSnapshot);
/*
* Apply the result format requests to the portal.
bool is_trans_exit = false;
bool completed;
char completionTag[COMPLETION_TAG_BUFSIZE];
+ struct timeval start_t, stop_t;
+ bool save_log_duration = log_duration;
+ int save_log_min_duration_statement = log_min_duration_statement;
+ bool save_log_statement_stats = log_statement_stats;
/* Adjust destination to tell printtup.c what to do */
dest = whereToSendOutput;
set_ps_display(portal->commandTag);
+ /*
+ * We use save_log_* so "SET log_duration = true" and "SET
+ * log_min_duration_statement = true" don't report incorrect time
+ * because gettimeofday() wasn't called. Similarly,
+ * log_statement_stats has to be captured once.
+ */
+ if (save_log_duration || save_log_min_duration_statement != -1)
+ gettimeofday(&start_t, NULL);
+
+ if (save_log_statement_stats)
+ ResetUsage();
+
+ if (log_statement == LOGSTMT_ALL)
+ /* We have the portal, so output the source query. */
+ ereport(LOG,
+ (errmsg("statement: EXECUTE %s [PREPARE: %s]", portal_name,
+ portal->sourceText ? portal->sourceText : "")));
+
BeginCommand(portal->commandTag, dest);
/* Check for transaction-control commands */
- if (length(portal->parseTrees) == 1)
+ if (list_length(portal->parseTrees) == 1)
{
- Query *query = (Query *) lfirst(portal->parseTrees);
+ Query *query = (Query *) linitial(portal->parseTrees);
if (query->commandType == CMD_UTILITY &&
query->utilityStmt != NULL &&
is_trans_stmt = true;
if (stmt->kind == TRANS_STMT_COMMIT ||
- stmt->kind == TRANS_STMT_ROLLBACK)
+ stmt->kind == TRANS_STMT_PREPARE ||
+ stmt->kind == TRANS_STMT_ROLLBACK ||
+ stmt->kind == TRANS_STMT_ROLLBACK_TO)
is_trans_exit = true;
}
}
ereport(ERROR,
(errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
errmsg("current transaction is aborted, "
- "commands ignored until end of transaction block")));
+ "commands ignored until end of transaction block")));
}
/* Check for cancel signal before we start execution */
pq_putemptymessage('s');
}
+ /*
+ * Combine processing here as we need to calculate the query duration
+ * in both instances.
+ */
+ if (save_log_duration || save_log_min_duration_statement != -1)
+ {
+ long usecs;
+
+ gettimeofday(&stop_t, NULL);
+ if (stop_t.tv_usec < start_t.tv_usec)
+ {
+ stop_t.tv_sec--;
+ stop_t.tv_usec += 1000000;
+ }
+ usecs = (long) (stop_t.tv_sec - start_t.tv_sec) * 1000000 +
+ (long) (stop_t.tv_usec - start_t.tv_usec);
+
+ /* Only print duration if we previously printed the statement. */
+ if (log_statement == LOGSTMT_ALL && save_log_duration)
+ ereport(LOG,
+ (errmsg("duration: %ld.%03ld ms",
+ (long) ((stop_t.tv_sec - start_t.tv_sec) * 1000 +
+ (stop_t.tv_usec - start_t.tv_usec) / 1000),
+ (long) (stop_t.tv_usec - start_t.tv_usec) % 1000)));
+
+ /*
+ * Output a duration_statement to the log if the query has
+ * exceeded the min duration, or if we are to print all durations.
+ */
+ if (save_log_min_duration_statement == 0 ||
+ (save_log_min_duration_statement > 0 &&
+ usecs >= save_log_min_duration_statement * 1000))
+ ereport(LOG,
+ (errmsg("duration: %ld.%03ld ms statement: EXECUTE %s [PREPARE: %s]",
+ (long) ((stop_t.tv_sec - start_t.tv_sec) * 1000 +
+ (stop_t.tv_usec - start_t.tv_usec) / 1000),
+ (long) (stop_t.tv_usec - start_t.tv_usec) % 1000,
+ portal_name,
+ portal->sourceText ? portal->sourceText : "")));
+ }
+
+ if (save_log_statement_stats)
+ ShowUsage("QUERY STATISTICS");
+
debug_query_string = NULL;
}
{
PreparedStatement *pstmt;
TupleDesc tupdesc;
- List *l;
+ ListCell *l;
StringInfoData buf;
/* Find prepared statement */
* First describe the parameters...
*/
pq_beginmessage(&buf, 't'); /* parameter description message type */
- pq_sendint(&buf, length(pstmt->argtype_list), 2);
+ pq_sendint(&buf, list_length(pstmt->argtype_list), 2);
foreach(l, pstmt->argtype_list)
{
- Oid ptype = lfirsto(l);
+ Oid ptype = lfirst_oid(l);
pq_sendint(&buf, (int) ptype, 4);
}
*/
tupdesc = FetchPreparedStatementResultDesc(pstmt);
if (tupdesc)
- {
- List *targetlist;
-
- if (ChoosePortalStrategy(pstmt->query_list) == PORTAL_ONE_SELECT)
- targetlist = ((Query *) lfirst(pstmt->query_list))->targetList;
- else
- targetlist = NIL;
- SendRowDescriptionMessage(tupdesc, targetlist, NULL);
- }
+ SendRowDescriptionMessage(tupdesc,
+ FetchPreparedStatementTargetList(pstmt),
+ NULL);
else
pq_putemptymessage('n'); /* NoData */
return; /* can't actually do anything... */
if (portal->tupDesc)
- {
- List *targetlist;
-
- if (portal->strategy == PORTAL_ONE_SELECT)
- targetlist = ((Query *) lfirst(portal->parseTrees))->targetList;
- else
- targetlist = NIL;
- SendRowDescriptionMessage(portal->tupDesc, targetlist,
+ SendRowDescriptionMessage(portal->tupDesc,
+ FetchPortalTargetList(portal),
portal->formats);
- }
else
pq_putemptymessage('n'); /* NoData */
}
{
if (xact_started)
{
- /* Invoke IMMEDIATE constraint triggers */
- DeferredTriggerEndQuery();
-
/* Cancel any active statement timeout before committing */
disable_sig_alarm(true);
/*
* Ideally this should be ereport(FATAL), but then we'd not get
- * control back (perhaps could fix by doing local sigsetjmp?)
+ * control back...
*/
ereport(WARNING,
(errcode(ERRCODE_CRASH_SHUTDOWN),
- errmsg("terminating connection because of crash of another server process"),
- errdetail("The postmaster has commanded this server process to roll back"
- " the current transaction and exit, because another"
- " server process exited abnormally and possibly corrupted"
- " shared memory."),
+ errmsg("terminating connection because of crash of another server process"),
+ errdetail("The postmaster has commanded this server process to roll back"
+ " the current transaction and exit, because another"
+ " server process exited abnormally and possibly corrupted"
+ " shared memory."),
errhint("In a moment you should be able to reconnect to the"
" database and repeat your command.")));
/* until we are done getting ready for it */
InterruptHoldoffCount++;
DisableNotifyInterrupt();
+ DisableCatchupInterrupt();
/* Make sure CheckDeadLock won't run while shutting down... */
LockWaitCancel();
InterruptHoldoffCount--;
* Query-cancel signal from postmaster: abort current transaction
* at soonest convenient time
*/
-static void
+void
StatementCancelHandler(SIGNAL_ARGS)
{
int save_errno = errno;
/*
- * Don't joggle the elbow of proc_exit, nor an already-in-progress
- * abort
+ * Don't joggle the elbow of proc_exit
*/
- if (!proc_exit_inprogress && !InError)
+ if (!proc_exit_inprogress)
{
InterruptPending = true;
QueryCancelPending = true;
if (LockWaitCancel())
{
DisableNotifyInterrupt();
+ DisableCatchupInterrupt();
InterruptHoldoffCount--;
ProcessInterrupts();
}
QueryCancelPending = false; /* ProcDie trumps QueryCancel */
ImmediateInterruptOK = false; /* not idle anymore */
DisableNotifyInterrupt();
+ DisableCatchupInterrupt();
ereport(FATAL,
(errcode(ERRCODE_ADMIN_SHUTDOWN),
errmsg("terminating connection due to administrator command")));
QueryCancelPending = false;
ImmediateInterruptOK = false; /* not idle anymore */
DisableNotifyInterrupt();
+ DisableCatchupInterrupt();
ereport(ERROR,
(errcode(ERRCODE_QUERY_CANCELED),
errmsg("canceling query due to user request")));
void
check_stack_depth(void)
{
- char stack_top_loc;
- int stack_depth;
+ char stack_top_loc;
+ int stack_depth;
/*
* Compute distance from PostgresMain's local variables to my own
*
* Note: in theory stack_depth should be ptrdiff_t or some such, but
- * since the whole point of this code is to bound the value to something
- * much less than integer-sized, int should work fine.
+ * since the whole point of this code is to bound the value to
+ * something much less than integer-sized, int should work fine.
*/
stack_depth = (int) (stack_base_ptr - &stack_top_loc);
+
/*
- * Take abs value, since stacks grow up on some machines, down on others
+ * Take abs value, since stacks grow up on some machines, down on
+ * others
*/
if (stack_depth < 0)
stack_depth = -stack_depth;
+
/*
* Trouble?
*
* The test on stack_base_ptr prevents us from erroring out if called
- * during process setup or in a non-backend process. Logically it should
- * be done first, but putting it here avoids wasting cycles during normal
- * cases.
+ * during process setup or in a non-backend process. Logically it
+ * should be done first, but putting it here avoids wasting cycles
+ * during normal cases.
*/
if (stack_depth > max_stack_depth_bytes &&
stack_base_ptr != NULL)
static void
usage(const char *progname)
{
- printf(gettext("%s is the PostgreSQL stand-alone backend. It is not\nintended to be used by normal users.\n\n"), progname);
+ printf(_("%s is the PostgreSQL stand-alone backend. It is not\nintended to be used by normal users.\n\n"), progname);
- printf(gettext("Usage:\n %s [OPTION]... [DBNAME]\n\n"), progname);
- printf(gettext("Options:\n"));
+ printf(_("Usage:\n %s [OPTION]... [DBNAME]\n\n"), progname);
+ printf(_("Options:\n"));
#ifdef USE_ASSERT_CHECKING
- printf(gettext(" -A 1|0 enable/disable run-time assert checking\n"));
+ printf(_(" -A 1|0 enable/disable run-time assert checking\n"));
#endif
- printf(gettext(" -B NBUFFERS number of shared buffers\n"));
- printf(gettext(" -c NAME=VALUE set run-time parameter\n"));
- printf(gettext(" -d 0-5 debugging level (0 is off)\n"));
- printf(gettext(" -D DATADIR database directory\n"));
- printf(gettext(" -e use European date input format (DMY)\n"));
- printf(gettext(" -E echo query before execution\n"));
- printf(gettext(" -F turn fsync off\n"));
- printf(gettext(" -N do not use newline as interactive query delimiter\n"));
- printf(gettext(" -o FILENAME send stdout and stderr to given file\n"));
- printf(gettext(" -P disable system indexes\n"));
- printf(gettext(" -s show statistics after each query\n"));
- printf(gettext(" -S WORK-MEM set amount of memory for sorts (in kbytes)\n"));
- printf(gettext(" --describe-config describe configuration parameters, then exit\n"));
- printf(gettext(" --help show this help, then exit\n"));
- printf(gettext(" --version output version information, then exit\n"));
- printf(gettext("\nDeveloper options:\n"));
- printf(gettext(" -f s|i|n|m|h forbid use of some plan types\n"));
- printf(gettext(" -i do not execute queries\n"));
- printf(gettext(" -O allow system table structure changes\n"));
- printf(gettext(" -t pa|pl|ex show timings after each query\n"));
- printf(gettext(" -W NUM wait NUM seconds to allow attach from a debugger\n"));
- printf(
gettext("\nReport bugs to <pgsql-bugs@postgresql.org>.\n"));
+ printf(_(" -B NBUFFERS number of shared buffers\n"));
+ printf(_(" -c NAME=VALUE set run-time parameter\n"));
+ printf(_(" -d 0-5 debugging level (0 is off)\n"));
+ printf(_(" -D DATADIR database directory\n"));
+ printf(_(" -e use European date input format (DMY)\n"));
+ printf(_(" -E echo query before execution\n"));
+ printf(_(" -F turn fsync off\n"));
+ printf(_(" -N do not use newline as interactive query delimiter\n"));
+ printf(_(" -o FILENAME send stdout and stderr to given file\n"));
+ printf(_(" -P disable system indexes\n"));
+ printf(_(" -s show statistics after each query\n"));
+ printf(_(" -S WORK-MEM set amount of memory for sorts (in kB)\n"));
+ printf(_(" --describe-config describe configuration parameters, then exit\n"));
+ printf(_(" --help show this help, then exit\n"));
+ printf(_(" --version output version information, then exit\n"));
+ printf(_("\nDeveloper options:\n"));
+ printf(_(" -f s|i|n|m|h forbid use of some plan types\n"));
+ printf(_(" -i do not execute queries\n"));
+ printf(_(" -O allow system table structure changes\n"));
+ printf(_(" -t pa|pl|ex show timings after each query\n"));
+ printf(_(" -W NUM wait NUM seconds to allow attach from a debugger\n"));
+ printf(
_("\nReport bugs to <pgsql-bugs@postgresql.org>.\n"));
}
+/*
+ * set_debug_options --- apply "-d N" command line option
+ *
+ * -d is not quite the same as setting log_min_messages because it enables
+ * other output options.
+ */
+void
+set_debug_options(int debug_flag, GucContext context, GucSource source)
+{
+ if (debug_flag > 0)
+ {
+ char debugstr[64];
+
+ sprintf(debugstr, "debug%d", debug_flag);
+ SetConfigOption("log_min_messages", debugstr, context, source);
+ }
+ else
+ SetConfigOption("log_min_messages", "notice", context, source);
+
+ if (debug_flag >= 1 && context == PGC_POSTMASTER)
+ {
+ SetConfigOption("log_connections", "true", context, source);
+ SetConfigOption("log_disconnections", "true", context, source);
+ }
+ if (debug_flag >= 2)
+ SetConfigOption("log_statement", "all", context, source);
+ if (debug_flag >= 3)
+ SetConfigOption("debug_print_parse", "true", context, source);
+ if (debug_flag >= 4)
+ SetConfigOption("debug_print_plan", "true", context, source);
+ if (debug_flag >= 5)
+ SetConfigOption("debug_print_rewritten", "true", context, source);
+}
+
/* ----------------------------------------------------------------
* PostgresMain
{
int flag;
const char *dbname = NULL;
- char *potential_DataDir = NULL;
+ char *userDoption = NULL;
bool secure;
int errs = 0;
- int debug_flag = 0;
- GucContext ctx,
- debug_context;
+ int debug_flag = -1; /* -1 means not given */
+ List *guc_names = NIL; /* for SUSET options */
+ List *guc_values = NIL;
+ GucContext ctx;
GucSource gucsource;
+ bool am_superuser;
char *tmp;
int firstchar;
char stack_base;
- StringInfoData input_message;
+ StringInfoData input_message;
+ sigjmp_buf local_sigjmp_buf;
volatile bool send_rfq = true;
+#define PendingConfigOption(name,val) \
+ (guc_names = lappend(guc_names, pstrdup(name)), \
+ guc_values = lappend(guc_values, pstrdup(val)))
+
/*
* Catch standard options before doing much else. This even works on
* systems without getopt_long.
/* Set up reference point for stack depth checking */
stack_base_ptr = &stack_base;
+ /* Compute paths, if we didn't inherit them from postmaster */
+ if (my_exec_path[0] == '\0')
+ {
+ if (find_my_exec(argv[0], my_exec_path) < 0)
+ elog(FATAL, "%s: could not locate my own executable path",
+ argv[0]);
+ }
+
+ if (pkglib_path[0] == '\0')
+ get_pkglib_path(my_exec_path, pkglib_path);
+
/*
* Set default values for command-line options.
*/
EchoQuery = false;
if (!IsUnderPostmaster)
- {
InitializeGUCOptions();
- potential_DataDir = getenv("PGDATA");
- }
/* ----------------
* parse command line arguments
/* all options are allowed until '-p' */
secure = true;
- ctx = debug_context = PGC_POSTMASTER;
+ ctx = PGC_POSTMASTER;
gucsource = PGC_S_ARGV; /* initial switches came from command line */
while ((flag = getopt(argc, argv, "A:B:c:D:d:Eef:FiNOPo:p:S:st:v:W:-:")) != -1)
+ {
switch (flag)
{
case 'A':
SetConfigOption("shared_buffers", optarg, ctx, gucsource);
break;
- case 'D': /* PGDATA directory */
+ case 'D': /* PGDATA or config directory */
if (secure)
- potential_DataDir = optarg;
+ userDoption = optarg;
break;
case 'd': /* debug level */
- {
- /*
- * Client option can't decrease debug level. We have
- * to do the test here because we group priv and
- * client set GUC calls below, after we know the final
- * debug value.
- */
- if (ctx != PGC_BACKEND || atoi(optarg) > debug_flag)
- {
- debug_flag = atoi(optarg);
- debug_context = ctx; /* save context for use
- * below */
- /* Set server debugging level. */
- if (debug_flag != 0)
- {
- char *debugstr = palloc(strlen("debug") + strlen(optarg) + 1);
-
- sprintf(debugstr, "debug%s", optarg);
- SetConfigOption("log_min_messages", debugstr, ctx, gucsource);
- pfree(debugstr);
-
- }
- else
-
- /*
- * -d0 allows user to prevent postmaster debug
- * from propagating to backend. It would be
- * nice to set it to the postgresql.conf value
- * here.
- */
- SetConfigOption("log_min_messages", "notice",
- ctx, gucsource);
- }
- }
+ debug_flag = atoi(optarg);
break;
case 'E':
case 'i': /* indexscan */
tmp = "enable_indexscan";
break;
+ case 'b': /* bitmapscan */
+ tmp = "enable_bitmapscan";
+ break;
case 't': /* tidscan */
tmp = "enable_tidscan";
break;
/*
* ignore system indexes
*
- * As of PG 7.4 this is safe to allow from the client,
- * since it only disables reading the system indexes,
- * not writing them. Worst case consequence is slowness.
+ * As of PG 7.4 this is safe to allow from the client, since
+ * it only disables reading the system indexes, not
+ * writing them. Worst case consequence is slowness.
*/
IgnoreSystemIndexes(true);
break;
break;
case 'p':
+
/*
* p - special flag passed if backend was forked by a
* postmaster.
/*
* s - report usage statistics (timings) after each query
+ *
+ * Since log options are SUSET, we need to postpone unless
+ * still in secure context
*/
- SetConfigOption("log_statement_stats", "true", ctx, gucsource);
+ if (ctx == PGC_BACKEND)
+ PendingConfigOption("log_statement_stats", "true");
+ else
+ SetConfigOption("log_statement_stats", "true",
+ ctx, gucsource);
break;
case 't':
break;
}
if (tmp)
- SetConfigOption(tmp, "true", ctx, gucsource);
+ {
+ if (ctx == PGC_BACKEND)
+ PendingConfigOption(tmp, "true");
+ else
+ SetConfigOption(tmp, "true", ctx, gucsource);
+ }
break;
case 'v':
/*
* wait N seconds to allow attach from a debugger
*/
- pg_usleep(atoi(optarg)*1000000L);
+ pg_usleep(atoi(optarg) * 1000000L);
break;
case 'c':
optarg)));
}
- SetConfigOption(name, value, ctx, gucsource);
+ /*
+ * If a SUSET option, must postpone evaluation, unless
+ * we are still reading secure switches.
+ */
+ if (ctx == PGC_BACKEND && IsSuperuserConfigOption(name))
+ PendingConfigOption(name, value);
+ else
+ SetConfigOption(name, value, ctx, gucsource);
free(name);
if (value)
free(value);
errs++;
break;
}
-
-
- /*
- * -d is not the same as setting log_min_messages because it enables
- * other output options.
- */
- if (debug_flag >= 1)
- {
- SetConfigOption("log_connections", "true", debug_context, gucsource);
- SetConfigOption("log_disconnections", "true", debug_context, gucsource);
}
- if (debug_flag >= 2)
- SetConfigOption("log_statement", "all", debug_context, gucsource);
- if (debug_flag >= 3)
- SetConfigOption("debug_print_parse", "true", debug_context, gucsource);
- if (debug_flag >= 4)
- SetConfigOption("debug_print_plan", "true", debug_context, gucsource);
- if (debug_flag >= 5)
- SetConfigOption("debug_print_rewritten", "true", debug_context, gucsource);
/*
* Process any additional GUC variable settings passed in startup
- * packet.
+ * packet. These are handled exactly like command-line variables.
*/
if (MyProcPort != NULL)
{
- List *gucopts = MyProcPort->guc_options;
+ ListCell *gucopts = list_head(MyProcPort->guc_options);
while (gucopts)
{
- char *name,
- *value;
+ char *name;
+ char *value;
name = lfirst(gucopts);
gucopts = lnext(gucopts);
+
value = lfirst(gucopts);
gucopts = lnext(gucopts);
- SetConfigOption(name, value, PGC_BACKEND, PGC_S_CLIENT);
- }
- /*
- * set up handler to log session end.
- */
- if (IsUnderPostmaster && Log_disconnections)
- on_proc_exit(log_disconnections,0);
+ if (IsSuperuserConfigOption(name))
+ PendingConfigOption(name, value);
+ else
+ SetConfigOption(name, value, PGC_BACKEND, PGC_S_CLIENT);
+ }
}
- if (!IsUnderPostmaster || ExecBackend)
+ /* Acquire configuration parameters, unless inherited from postmaster */
+ if (!IsUnderPostmaster)
{
- if (!potential_DataDir)
- {
- fprintf(stderr,
- gettext("%s does not know where to find the database system data.\n"
- "You must specify the directory that contains the database system\n"
- "either by specifying the -D invocation option or by setting the\n"
- "PGDATA environment variable.\n"),
- argv[0]);
+ if (!SelectConfigFiles(userDoption, argv[0]))
proc_exit(1);
- }
- SetDataDir(potential_DataDir);
}
- Assert(DataDir);
-
- /* Acquire configuration parameters */
- if (IsUnderPostmaster)
- {
-#ifdef EXEC_BACKEND
- read_nondefault_variables();
-#endif
- } else
- ProcessConfigFile(PGC_POSTMASTER);
/*
* Set up signal handlers and masks.
* midst of output during who-knows-what operation...
*/
pqsignal(SIGPIPE, SIG_IGN);
- pqsignal(SIGUSR1, SIG_IGN); /* this signal available for use */
-
- pqsignal(SIGUSR2, Async_NotifyHandler); /* flush also sinval cache */
+ pqsignal(SIGUSR1, CatchupInterruptHandler);
+ pqsignal(SIGUSR2, NotifyInterruptHandler);
pqsignal(SIGFPE, FloatExceptionHandler);
/*
{
ereport(FATAL,
(errcode(ERRCODE_SYNTAX_ERROR),
- errmsg("invalid command-line arguments for server process"),
- errhint("Try \"%s --help\" for more information.", argv[0])));
+ errmsg("invalid command-line arguments for server process"),
+ errhint("Try \"%s --help\" for more information.", argv[0])));
}
- XLOGPathInit();
-
BaseInit();
}
else
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("%s: invalid command-line arguments",
argv[0]),
- errhint("Try \"%s --help\" for more information.", argv[0])));
+ errhint("Try \"%s --help\" for more information.", argv[0])));
}
else if (argc - optind == 1)
dbname = argv[optind];
argv[0])));
}
- /*
- * On some systems our dynloader code needs the executable's pathname.
- */
- if (strlen(my_exec_path) == 0 && find_my_exec(my_exec_path, argv[0]) < 0)
- ereport(FATAL,
- (errmsg("%s: could not locate postgres executable",
- argv[0])));
/*
* Validate we have been given a reasonable-looking DataDir (if
* under postmaster, assume postmaster did this already).
*/
+ Assert(DataDir);
ValidatePgVersion(DataDir);
+ /* Change into DataDir (if under postmaster, was done already) */
+ ChangeToDataDir();
+
/*
* Create lockfile for data directory.
*/
- CreateDataDirLockFile(DataDir, false);
+ CreateDataDirLockFile(false);
- XLOGPathInit();
BaseInit();
/*
*/
LoadFreeSpaceMap();
on_shmem_exit(DumpFreeSpaceMap, 0);
+
+ /*
+ * We have to build the flat file for pg_database, but not for
+ * the user and group tables, since we won't try to do authentication.
+ */
+ BuildFlatFiles(true);
}
/*
*/
ereport(DEBUG3,
(errmsg_internal("InitPostgres")));
- InitPostgres(dbname, username);
+ am_superuser = InitPostgres(dbname, username);
SetProcessingMode(NormalProcessing);
+ /*
+ * Now that we know if client is a superuser, we can try to apply SUSET
+ * GUC options that came from the client.
+ */
+ ctx = am_superuser ? PGC_SUSET : PGC_USERSET;
+
+ if (debug_flag >= 0)
+ set_debug_options(debug_flag, ctx, PGC_S_CLIENT);
+
+ if (guc_names != NIL)
+ {
+ ListCell *namcell,
+ *valcell;
+
+ forboth(namcell, guc_names, valcell, guc_values)
+ {
+ char *name = (char *) lfirst(namcell);
+ char *value = (char *) lfirst(valcell);
+
+ SetConfigOption(name, value, ctx, PGC_S_CLIENT);
+ pfree(name);
+ pfree(value);
+ }
+ }
+
+ /*
+ * Now all GUC states are fully set up. Report them to client if
+ * appropriate.
+ */
+ BeginReportingGUCOptions();
+
+ /*
+ * Also set up handler to log session end; we have to wait till now
+ * to be sure Log_disconnections has its final value.
+ */
+ if (IsUnderPostmaster && Log_disconnections)
+ on_proc_exit(log_disconnections, 0);
+
/*
* Send this backend's cancellation info to the frontend.
*/
*/
pgstat_bestart();
+ /*
+ * Remember stand-alone backend startup time
+ */
+ if (!IsUnderPostmaster)
+ PgStartTime = GetCurrentTimestamp();
+
/*
* POSTGRES main processing loop begins here
*
* If an exception is encountered, processing resumes here so we abort
* the current transaction and start a new one.
+ *
+ * You might wonder why this isn't coded as an infinite loop around a
+ * PG_TRY construct. The reason is that this is the bottom of the
+ * exception stack, and so with PG_TRY there would be no exception
+ * handler in force at all during the CATCH part. By leaving the
+ * outermost setjmp always active, we have at least some chance of
+ * recovering from an error during error recovery. (If we get into an
+ * infinite loop thereby, it will soon be stopped by overflow of
+ * elog.c's internal state stack.)
*/
- if (sigsetjmp(Warn_restart, 1) != 0)
+ if (sigsetjmp(local_sigjmp_buf, 1) != 0)
{
/*
* NOTE: if you are tempted to add more code in this if-block,
- * consider the probability that it should be in
- * AbortTransaction() instead.
- *
- * Make sure we're not interrupted while cleaning up. Also forget
- * any pending QueryCancel request, since we're aborting anyway.
- * Force InterruptHoldoffCount to a known state in case we
- * ereport'd from inside a holdoff section.
+ * consider the high probability that it should be in
+ * AbortTransaction() instead. The only stuff done directly here
+ * should be stuff that is guaranteed to apply *only* for
+ * outer-level error recovery, such as adjusting the FE/BE
+ * protocol status.
+ */
+
+ /* Since not using PG_TRY, must reset error stack by hand */
+ error_context_stack = NULL;
+
+ /* Prevent interrupts while cleaning up */
+ HOLD_INTERRUPTS();
+
+ /*
+ * Forget any pending QueryCancel request, since we're returning
+ * to the idle loop anyway, and cancel the statement timer if
+ * running.
*/
- ImmediateInterruptOK = false;
QueryCancelPending = false;
- InterruptHoldoffCount = 1;
- CritSectionCount = 0; /* should be unnecessary, but... */
disable_sig_alarm(true);
QueryCancelPending = false; /* again in case timeout occurred */
- DisableNotifyInterrupt();
- debug_query_string = NULL;
/*
- * Make sure we are in a valid memory context during recovery.
- *
- * We use ErrorContext in hopes that it will have some free space
- * even if we're otherwise up against it...
+ * Turn off these interrupts too. This is only needed here and
+ * not in other exception-catching places since these interrupts
+ * are only enabled while we wait for client input.
*/
- MemoryContextSwitchTo(ErrorContext);
+ DoingCommandRead = false;
+ DisableNotifyInterrupt();
+ DisableCatchupInterrupt();
- /* Do the recovery */
- ereport(DEBUG2,
- (errmsg_internal("AbortCurrentTransaction")));
- AbortCurrentTransaction();
+ /* Make sure libpq is in a good state */
+ pq_comm_reset();
+
+ /* Report the error to the client and/or server log */
+ EmitErrorReport();
/*
- * Now return to normal top-level context and clear ErrorContext
- * for next time.
+ * Make sure debug_query_string gets reset before we possibly
+ * clobber the storage it points at.
*/
- MemoryContextSwitchTo(TopMemoryContext);
- MemoryContextResetAndDeleteChildren(ErrorContext);
- ActivePortal = NULL;
- PortalContext = NULL;
- QueryContext = NULL;
+ debug_query_string = NULL;
/*
- * Clear flag to indicate that we got out of error recovery mode
- * successfully. (Flag was set in elog.c before longjmp().)
+ * Abort the current transaction in order to recover.
*/
- InError = false;
- xact_started = false;
+ AbortCurrentTransaction();
/*
- * Clear flag that causes accounting for cost based vacuum.
+ * Now return to normal top-level context and clear ErrorContext
+ * for next time.
*/
- VacuumCostActive = false;
+ MemoryContextSwitchTo(TopMemoryContext);
+ FlushErrorState();
+ QueryContext = NULL;
/*
* If we were handling an extended-query-protocol message,
if (doing_extended_query_message)
ignore_till_sync = true;
- /*
- * Exit interrupt holdoff section we implicitly established above.
- */
+ /* We don't have a transaction command open anymore */
+ xact_started = false;
+
+ /* Now we can allow interrupts again */
RESUME_INTERRUPTS();
}
- Warn_restart_ready = true; /* we can now handle ereport(ERROR) */
+ /* We can now handle ereport(ERROR) */
+ PG_exception_stack = &local_sigjmp_buf;
PG_SETMASK(&UnBlockSig);
*
* This is also a good time to send collected statistics to the
* collector, and to update the PS stats display. We avoid doing
- * those every time through the message loop because it'd slow down
- * processing of batched messages.
+ * those every time through the message loop because it'd slow
+ * down processing of batched messages, and because we don't want
+ * to report uncommitted updates (that confuses autovacuum).
*/
if (send_rfq)
{
- pgstat_report_tabstat();
-
if (IsTransactionOrTransactionBlock())
{
set_ps_display("idle in transaction");
}
else
{
+ pgstat_report_tabstat();
+
set_ps_display("idle");
pgstat_report_activity("<IDLE>");
}
}
/*
- * (2) deal with pending asynchronous NOTIFY from other backends,
- * and enable async.c's signal handler to execute NOTIFY directly.
- * Then set up other stuff needed before blocking for input.
+ * (2) Allow asynchronous signals to be executed immediately
+ * if they come in while we are waiting for client input.
+ * (This must be conditional since we don't want, say, reads on
+ * behalf of COPY FROM STDIN doing the same thing.)
*/
- QueryCancelPending = false; /* forget any earlier CANCEL
- * signal */
-
- EnableNotifyInterrupt();
-
- /* Allow "die" interrupt to be processed while waiting */
- ImmediateInterruptOK = true;
- /* and don't forget to detect one that already arrived */
- QueryCancelPending = false;
- CHECK_FOR_INTERRUPTS();
+ QueryCancelPending = false; /* forget any earlier CANCEL signal */
+ DoingCommandRead = true;
/*
* (3) read a command (loop blocks here)
*/
- if (!in_fatal_exit)
- firstchar = ReadCommand(&input_message);
- else
- firstchar = EOF;
+ firstchar = ReadCommand(&input_message);
/*
* (4) disable async signal conditions again.
*/
- ImmediateInterruptOK = false;
- QueryCancelPending = false; /* forget any CANCEL signal */
-
- DisableNotifyInterrupt();
+ DoingCommandRead = false;
/*
* (5) check for any other interesting events that happened while
if (got_SIGHUP)
{
got_SIGHUP = false;
-#ifdef EXEC_BACKEND
- read_nondefault_variables();
-#else
ProcessConfigFile(PGC_SIGHUP);
-#endif
}
/*
/* switch back to message context */
MemoryContextSwitchTo(MessageContext);
+ /* set snapshot in case function needs one */
+ ActiveSnapshot = CopySnapshot(GetTransactionSnapshot());
+
if (HandleFunctionRequest(&input_message) == EOF)
{
/* lost frontend connection during F message input */
* Otherwise it will fail to be called during other
* backend-shutdown scenarios.
*/
- proc_exit(!in_fatal_exit ? 0 : proc_exit_inprogress ||
- !IsUnderPostmaster);
+ proc_exit(0);
case 'd': /* copy data */
case 'c': /* copy done */
/*
* on_proc_exit handler to log end of session
*/
-static void
+static void
log_disconnections(int code, Datum arg)
{
- Port *port = MyProcPort;
+ Port *port = MyProcPort;
struct timeval end;
- int hours, minutes, seconds;
-
- char session_time[20];
- char uname[6+NAMEDATALEN];
- char dbname[10+NAMEDATALEN];
- char remote_host[7 + NI_MAXHOST];
- char remote_port[7 + NI_MAXSERV];
-
- snprintf(uname, sizeof(uname)," user=%s",port->user_name);
- snprintf(dbname, sizeof(dbname)," database=%s",port->database_name);
- snprintf(remote_host,sizeof(remote_host)," host=%s",
+ int hours,
+ minutes,
+ seconds;
+
+ char session_time[20];
+ char uname[6 + NAMEDATALEN];
+ char dbname[10 + NAMEDATALEN];
+ char remote_host[7 + NI_MAXHOST];
+ char remote_port[7 + NI_MAXSERV];
+
+ snprintf(uname, sizeof(uname), " user=%s", port->user_name);
+ snprintf(dbname, sizeof(dbname), " database=%s", port->database_name);
+ snprintf(remote_host, sizeof(remote_host), " host=%s",
port->remote_host);
- snprintf(remote_port,sizeof(remote_port)," port=%s",port->remote_port);
+ snprintf(remote_port, sizeof(remote_port), " port=%s", port->remote_port);
- gettimeofday(&end,NULL);
+ gettimeofday(&end, NULL);
if (end.tv_usec < port->session_start.tv_usec)
{
end.tv_sec -= port->session_start.tv_sec;
end.tv_usec -= port->session_start.tv_usec;
- hours = end.tv_sec / 3600;
- end.tv_sec %= 3600;
- minutes = end.tv_sec / 60;
- seconds = end.tv_sec % 60;
+ hours = end.tv_sec / SECS_PER_HOUR;
+ end.tv_sec %= SECS_PER_HOUR;
+ minutes = end.tv_sec / SECS_PER_MINUTE;
+ seconds = end.tv_sec % SECS_PER_MINUTE;
/* if time has gone backwards for some reason say so, or print time */
if (end.tv_sec < 0)
- snprintf(session_time,sizeof(session_time),"negative!");
+ snprintf(session_time, sizeof(session_time), "negative!");
else
- /* for stricter accuracy here we could round - this is close enough */
+
+ /*
+ * for stricter accuracy here we could round - this is close
+ * enough
+ */
snprintf(session_time, sizeof(session_time),
- "%d:%02d:%02d.%02d",
- hours, minutes, seconds, (int) (end.tv_usec/10000));
-
+ "%d:%02d:%02d.%02d",
+ hours, minutes, seconds, (int) (end.tv_usec / 10000));
+
ereport(
- LOG,
- (errmsg("disconnection: session time: %s%s%s%s%s",
- session_time,uname,dbname,remote_host,remote_port)));
+ LOG,
+ (errmsg("disconnection: session time: %s%s%s%s%s",
+ session_time, uname, dbname, remote_host, remote_port)));
}
projects / postgresql / blobdiff