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Per previous discussions, here are two functions to send INT and TERM

Browse Source 
(cancel and terminate) signals to other backends.   They permit only INT
and TERM, and permits sending only to postgresql backends.

Magnus Hagander
This commit is contained in:
Bruce Momjian
2004-06-02 21:29:29 +00:00
parent de2c66539e
commit e8d9d68ca4
6 changed files with 95 additions and 7 deletions
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48
src/backend/utils/adt/misc.c
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@ -8,16 +8,18 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/misc.c,v 1.33 2004/05/21 05:08:02 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/misc.c,v 1.34 2004/06/02 21:29:29 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <sys/file.h>
#include <signal.h>
#include "commands/dbcommands.h"
#include "miscadmin.h"
#include "storage/sinval.h"
#include "utils/builtins.h"
@ -57,3 +59,47 @@ current_database(PG_FUNCTION_ARGS)
namestrcpy(db, get_database_name(MyDatabaseId));
PG_RETURN_NAME(db);
}
/*
* Functions to terminate a backend or cancel a query running on
* a different backend.
*/
static int pg_signal_backend(int pid, int sig)
{
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("only superuser can signal other backends"))));
if (!IsBackendPid(pid))
{
/* This is just a warning so a loop-through-resultset will not abort
* if one backend terminated on it's own during the run */
ereport(WARNING,
(errmsg("pid %i is not a postgresql backend",pid)));
return 0;
}
if (kill(pid, sig))
{
/* Again, just a warning to allow loops */
ereport(WARNING,
(errmsg("failed to send signal to backend %i: %m",pid)));
return 0;
}
return 1;
}
Datum
pg_terminate_backend(PG_FUNCTION_ARGS)
{
PG_RETURN_INT32(pg_signal_backend(PG_GETARG_INT32(0),SIGTERM));
}
Datum
pg_cancel_backend(PG_FUNCTION_ARGS)
{
PG_RETURN_INT32(pg_signal_backend(PG_GETARG_INT32(0),SIGINT));
}