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84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/* lock.c - routines to open and apply an advisory lock to a file */
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 1998-2012 The OpenLDAP Foundation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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/* Portions Copyright (c) 1995 Regents of the University of Michigan.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and that due credit is given
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* to the University of Michigan at Ann Arbor. The name of the University
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* may not be used to endorse or promote products derived from this
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* software without specific prior written permission. This software
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* is provided ``as is'' without express or implied warranty.
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/string.h>
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#include <ac/socket.h>
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#include <ac/time.h>
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#include <ac/unistd.h>
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#ifdef HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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#include "slap.h"
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#include <lutil.h>
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FILE *
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lock_fopen( const char *fname, const char *type, FILE **lfp )
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{
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FILE *fp;
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char buf[MAXPATHLEN];
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/* open the lock file */
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snprintf( buf, sizeof buf, "%s.lock", fname );
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if ( (*lfp = fopen( buf, "w" )) == NULL ) {
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Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", buf, 0, 0 );
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return( NULL );
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}
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/* acquire the lock */
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ldap_lockf( fileno(*lfp) );
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/* open the log file */
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if ( (fp = fopen( fname, type )) == NULL ) {
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Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", fname, 0, 0 );
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ldap_unlockf( fileno(*lfp) );
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fclose( *lfp );
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*lfp = NULL;
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return( NULL );
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}
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return( fp );
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}
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int
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lock_fclose( FILE *fp, FILE *lfp )
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{
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int rc = fclose( fp );
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/* unlock */
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ldap_unlockf( fileno(lfp) );
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fclose( lfp );
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return( rc );
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}
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