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/*-------------------------------------------------------------------------
*
* misc.c
*
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/misc.c,v 1.35 2004/07/02 18:59:22 joe Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <sys/file.h>
#include <signal.h>
#include <dirent.h>
#include "commands/dbcommands.h"
#include "miscadmin.h"
#include "storage/sinval.h"
#include "storage/fd.h"
#include "utils/builtins.h"
#include "funcapi.h"
#include "catalog/pg_type.h"
#include "catalog/pg_tablespace.h"
/*
* Check if data is Null
*/
Datum
nullvalue(PG_FUNCTION_ARGS)
{
if (PG_ARGISNULL(0))
PG_RETURN_BOOL(true);
PG_RETURN_BOOL(false);
}
/*
* Check if data is not Null
*/
Datum
nonnullvalue(PG_FUNCTION_ARGS)
{
if (PG_ARGISNULL(0))
PG_RETURN_BOOL(false);
PG_RETURN_BOOL(true);
}
/*
* current_database()
* Expose the current database to the user
*/
Datum
current_database(PG_FUNCTION_ARGS)
{
Name db;
db = (Name) palloc(NAMEDATALEN);
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));
}
typedef struct
{
char *location;
DIR *dirdesc;
} ts_db_fctx;
Datum pg_tablespace_databases(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
struct dirent *de;
ts_db_fctx *fctx;
if (SRF_IS_FIRSTCALL())
{
MemoryContext oldcontext;
Oid tablespaceOid=PG_GETARG_OID(0);
funcctx=SRF_FIRSTCALL_INIT();
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
fctx = palloc(sizeof(ts_db_fctx));
/*
* size = path length + tablespace dirname length
* + 2 dir sep chars + oid + terminator
*/
fctx->location = (char*) palloc(strlen(DataDir) + 11 + 10 + 1);
if (tablespaceOid == GLOBALTABLESPACE_OID)
{
fctx->dirdesc = NULL;
ereport(NOTICE,
(errcode(ERRCODE_WARNING),
errmsg("global tablespace never has databases.")));
}
else
{
if (tablespaceOid == DEFAULTTABLESPACE_OID)
sprintf(fctx->location, "%s/base", DataDir);
else
sprintf(fctx->location, "%s/pg_tblspc/%u", DataDir,
tablespaceOid);
fctx->dirdesc = AllocateDir(fctx->location);
if (!fctx->dirdesc) /* not a tablespace */
ereport(NOTICE,
(errcode(ERRCODE_WARNING),
errmsg("%d is no tablespace oid.", tablespaceOid)));
}
funcctx->user_fctx = fctx;
MemoryContextSwitchTo(oldcontext);
}
funcctx=SRF_PERCALL_SETUP();
fctx = (ts_db_fctx*) funcctx->user_fctx;
if (!fctx->dirdesc) /* not a tablespace */
SRF_RETURN_DONE(funcctx);
while ((de = readdir(fctx->dirdesc)) != NULL)
{
char *subdir;
DIR *dirdesc;
Oid datOid = atol(de->d_name);
if (!datOid)
continue;
/* 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);
if (!de) /* database subdir is empty; don't report tablespace as used */
continue;
}
SRF_RETURN_NEXT(funcctx, ObjectIdGetDatum(datOid));
}
FreeDir(fctx->dirdesc);
SRF_RETURN_DONE(funcctx);
}
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