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/* lock.c - routines to open and apply an advisory lock to a file */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1998-2018 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
/* Portions Copyright (c) 1995 Regents of the University of Michigan.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of Michigan at Ann Arbor. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/
#include "portable.h"
#include <stdio.h>
#include <ac/string.h>
#include <ac/socket.h>
#include <ac/time.h>
#include <ac/unistd.h>
#ifdef HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#include "slap.h"
#include <lutil.h>
FILE *
lock_fopen( const char *fname, const char *type, FILE **lfp )
{
FILE *fp;
char buf[MAXPATHLEN];
/* open the lock file */
snprintf( buf, sizeof buf, "%s.lock", fname );
if ( (*lfp = fopen( buf, "w" )) == NULL ) {
Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", buf, 0, 0 );
return( NULL );
}
/* acquire the lock */
ldap_lockf( fileno(*lfp) );
/* open the log file */
if ( (fp = fopen( fname, type )) == NULL ) {
Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", fname, 0, 0 );
ldap_unlockf( fileno(*lfp) );
fclose( *lfp );
*lfp = NULL;
return( NULL );
}
return( fp );
}
int
lock_fclose( FILE *fp, FILE *lfp )
{
int rc = fclose( fp );
/* unlock */
ldap_unlockf( fileno(lfp) );
fclose( lfp );
return( rc );
}
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