1996-07-09 08:22:35 +02:00
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/*-------------------------------------------------------------------------
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*
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1999-02-14 00:22:53 +01:00
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* misc.c
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1997-09-07 07:04:48 +02:00
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*
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1996-07-09 08:22:35 +02:00
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*
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2003-08-04 04:40:20 +02:00
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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2000-01-26 06:58:53 +01:00
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* Portions Copyright (c) 1994, Regents of the University of California
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1996-07-09 08:22:35 +02:00
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*
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*
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* IDENTIFICATION
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2004-06-02 23:29:29 +02:00
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* $PostgreSQL: pgsql/src/backend/utils/adt/misc.c,v 1.34 2004/06/02 21:29:29 momjian Exp $
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1996-07-09 08:22:35 +02:00
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*
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*-------------------------------------------------------------------------
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*/
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2002-09-02 04:47:07 +02:00
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#include "postgres.h"
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1996-07-09 08:22:35 +02:00
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#include <sys/file.h>
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2004-06-02 23:29:29 +02:00
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#include <signal.h>
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2000-06-05 09:29:25 +02:00
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2003-06-27 19:07:03 +02:00
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#include "commands/dbcommands.h"
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2002-08-20 06:46:00 +02:00
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#include "miscadmin.h"
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2004-06-02 23:29:29 +02:00
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#include "storage/sinval.h"
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1996-07-09 08:22:35 +02:00
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#include "utils/builtins.h"
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2000-06-05 09:29:25 +02:00
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/*
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1997-09-07 07:04:48 +02:00
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* Check if data is Null
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1996-07-09 08:22:35 +02:00
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*/
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2000-06-05 09:29:25 +02:00
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Datum
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nullvalue(PG_FUNCTION_ARGS)
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1996-07-09 08:22:35 +02:00
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{
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2000-06-05 09:29:25 +02:00
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if (PG_ARGISNULL(0))
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PG_RETURN_BOOL(true);
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PG_RETURN_BOOL(false);
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1996-07-09 08:22:35 +02:00
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}
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2000-06-05 09:29:25 +02:00
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/*
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* Check if data is not Null
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*/
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Datum
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nonnullvalue(PG_FUNCTION_ARGS)
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1996-07-09 08:22:35 +02:00
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{
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2000-06-05 09:29:25 +02:00
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if (PG_ARGISNULL(0))
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PG_RETURN_BOOL(false);
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PG_RETURN_BOOL(true);
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1996-07-09 08:22:35 +02:00
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}
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2002-08-20 06:46:00 +02:00
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/*
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* current_database()
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* Expose the current database to the user
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*/
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Datum
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current_database(PG_FUNCTION_ARGS)
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{
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2002-09-04 22:31:48 +02:00
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Name db;
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2002-08-20 06:46:00 +02:00
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db = (Name) palloc(NAMEDATALEN);
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2003-06-27 16:45:32 +02:00
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namestrcpy(db, get_database_name(MyDatabaseId));
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2002-08-20 06:46:00 +02:00
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PG_RETURN_NAME(db);
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}
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2004-06-02 23:29:29 +02:00
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/*
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* Functions to terminate a backend or cancel a query running on
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* a different backend.
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*/
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static int pg_signal_backend(int pid, int sig)
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{
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if (!superuser())
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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(errmsg("only superuser can signal other backends"))));
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if (!IsBackendPid(pid))
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{
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/* This is just a warning so a loop-through-resultset will not abort
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* if one backend terminated on it's own during the run */
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ereport(WARNING,
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(errmsg("pid %i is not a postgresql backend",pid)));
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return 0;
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}
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if (kill(pid, sig))
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{
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/* Again, just a warning to allow loops */
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ereport(WARNING,
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(errmsg("failed to send signal to backend %i: %m",pid)));
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return 0;
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}
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return 1;
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}
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Datum
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pg_terminate_backend(PG_FUNCTION_ARGS)
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{
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PG_RETURN_INT32(pg_signal_backend(PG_GETARG_INT32(0),SIGTERM));
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}
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Datum
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pg_cancel_backend(PG_FUNCTION_ARGS)
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{
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PG_RETURN_INT32(pg_signal_backend(PG_GETARG_INT32(0),SIGINT));
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}
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