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Add functions pg_start_backup, pg_stop_backup to create backup label

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and history files as per recent discussion.  While at it, remove
pg_terminate_backend, since we have decided we do not have time during
this release cycle to address the reliability concerns it creates.
Split the 'Miscellaneous Functions' documentation section into
'System Information Functions' and 'System Administration Functions',
which hopefully will draw the eyes of those looking for such things.
This commit is contained in:
Tom Lane
2004-08-03 20:32:36 +00:00
parent a83c45c4c6
commit 58c41712d5
12 changed files with 1352 additions and 949 deletions
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86
src/backend/utils/adt/misc.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/misc.c,v 1.35 2004/07/02 18:59:22 joe Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/misc.c,v 1.36 2004/08/03 20:32:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -27,6 +27,8 @@
#include "catalog/pg_type.h"
#include "catalog/pg_tablespace.h"
#define atooid(x) ((Oid) strtoul((x), NULL, 10))
/*
* Check if data is Null
@ -67,8 +69,7 @@ current_database(PG_FUNCTION_ARGS)
/*
* Functions to terminate a backend or cancel a query running on
* a different backend.
* Functions to send signals to other backends.
*/
static int pg_signal_backend(int pid, int sig)
@ -76,14 +77,16 @@ static int pg_signal_backend(int pid, int sig)
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("only superuser can signal other backends"))));
(errmsg("must be superuser to signal other server processes"))));
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 */
/*
* 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)));
(errmsg("PID %d is not a PostgreSQL server process", pid)));
return 0;
}
@ -91,24 +94,32 @@ static int pg_signal_backend(int pid, int sig)
{
/* Again, just a warning to allow loops */
ereport(WARNING,
(errmsg("failed to send signal to backend %i: %m",pid)));
(errmsg("could not send signal to process %d: %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));
}
#ifdef NOT_USED
/* Disabled in 8.0 due to reliability concerns; FIXME someday */
Datum
pg_terminate_backend(PG_FUNCTION_ARGS)
{
PG_RETURN_INT32(pg_signal_backend(PG_GETARG_INT32(0),SIGTERM));
}
#endif
/* Function to find out which databases make use of a tablespace */
typedef struct
{
@ -140,9 +151,8 @@ Datum pg_tablespace_databases(PG_FUNCTION_ARGS)
if (tablespaceOid == GLOBALTABLESPACE_OID)
{
fctx->dirdesc = NULL;
ereport(NOTICE,
(errcode(ERRCODE_WARNING),
errmsg("global tablespace never has databases.")));
ereport(WARNING,
(errmsg("global tablespace never has databases")));
}
else
{
@ -154,10 +164,17 @@ Datum pg_tablespace_databases(PG_FUNCTION_ARGS)
fctx->dirdesc = AllocateDir(fctx->location);
if (!fctx->dirdesc) /* not a tablespace */
ereport(NOTICE,
(errcode(ERRCODE_WARNING),
errmsg("%d is no tablespace oid.", tablespaceOid)));
if (!fctx->dirdesc)
{
/* the only expected error is ENOENT */
if (errno != ENOENT)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not open directory \"%s\": %m",
fctx->location)));
ereport(WARNING,
(errmsg("%u is not a tablespace oid", tablespaceOid)));
}
}
funcctx->user_fctx = fctx;
MemoryContextSwitchTo(oldcontext);
@ -174,27 +191,30 @@ Datum pg_tablespace_databases(PG_FUNCTION_ARGS)
char *subdir;
DIR *dirdesc;
Oid datOid = atol(de->d_name);
Oid datOid = atooid(de->d_name);
/* this test skips . and .., but is awfully weak */
if (!datOid)
continue;
/* if database subdir is empty, don't report tablespace as used */
/* size = path length + dir sep char + file name + terminator */
subdir = palloc(strlen(fctx->location) + 1 + strlen(de->d_name) + 1);
sprintf(subdir, "%s/%s", fctx->location, de->d_name);
dirdesc = AllocateDir(subdir);
if (dirdesc)
{
while ((de = readdir(dirdesc)) != 0)
{
if (strcmp(de->d_name, ".") && strcmp(de->d_name, ".."))
break;
}
pfree(subdir);
FreeDir(dirdesc);
pfree(subdir);
if (!dirdesc)
continue; /* XXX more sloppiness */
if (!de) /* database subdir is empty; don't report tablespace as used */
continue;
while ((de = readdir(dirdesc)) != 0)
{
if (strcmp(de->d_name, ".") != 0 && strcmp(de->d_name, "..") != 0)
break;
}
FreeDir(dirdesc);
if (!de)
continue; /* indeed, nothing in it */
SRF_RETURN_NEXT(funcctx, ObjectIdGetDatum(datOid));
}