70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
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/*-------------------------------------------------------------------------
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*
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* lockcmds.c
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* Lock command support code
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*
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/commands/lockcmds.c,v 1.1 2002/04/15 05:22:03 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/heapam.h"
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#include "catalog/namespace.h"
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#include "commands/lockcmds.h"
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#include "miscadmin.h"
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#include "utils/acl.h"
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/*
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* LOCK TABLE
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*/
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void
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LockTableCommand(LockStmt *lockstmt)
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{
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List *p;
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/*
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* Iterate over the list and open, lock, and close the relations one
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* at a time
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*/
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foreach(p, lockstmt->relations)
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{
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RangeVar *relation = lfirst(p);
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Oid reloid;
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int32 aclresult;
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Relation rel;
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/*
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* We don't want to open the relation until we've checked privilege.
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* So, manually get the relation OID.
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*/
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reloid = RangeVarGetRelid(relation, false);
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if (lockstmt->mode == AccessShareLock)
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aclresult = pg_class_aclcheck(reloid, GetUserId(),
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ACL_SELECT);
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else
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aclresult = pg_class_aclcheck(reloid, GetUserId(),
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ACL_UPDATE | ACL_DELETE);
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if (aclresult != ACLCHECK_OK)
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elog(ERROR, "LOCK TABLE: permission denied");
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rel = relation_open(reloid, lockstmt->mode);
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/* Currently, we only allow plain tables to be locked */
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if (rel->rd_rel->relkind != RELKIND_RELATION)
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elog(ERROR, "LOCK TABLE: %s is not a table",
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relation->relname);
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relation_close(rel, NoLock); /* close rel, keep lock */
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}
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}
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