1/* lock.c - routines to open and apply an advisory lock to a file */
2/* $OpenLDAP$ */
3/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4 *
5 * Copyright 1998-2011 The OpenLDAP Foundation.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted only as authorized by the OpenLDAP
10 * Public License.
11 *
12 * A copy of this license is available in the file LICENSE in the
13 * top-level directory of the distribution or, alternatively, at
14 * <http://www.OpenLDAP.org/license.html>.
15 */
16/* Portions Copyright (c) 1995 Regents of the University of Michigan.
17 * All rights reserved.
18 *
19 * Redistribution and use in source and binary forms are permitted
20 * provided that this notice is preserved and that due credit is given
21 * to the University of Michigan at Ann Arbor. The name of the University
22 * may not be used to endorse or promote products derived from this
23 * software without specific prior written permission. This software
24 * is provided ``as is'' without express or implied warranty.
25 */
26
27#include "portable.h"
28
29#include <stdio.h>
30
31#include <ac/string.h>
32#include <ac/socket.h>
33#include <ac/time.h>
34#include <ac/unistd.h>
35
36#ifdef HAVE_SYS_FILE_H
37#include <sys/file.h>
38#endif
39
40#include "slap.h"
41#include <lutil.h>
42
43FILE *
44lock_fopen( const char *fname, const char *type, FILE **lfp )
45{
46	FILE	*fp;
47	char	buf[MAXPATHLEN];
48
49	/* open the lock file */
50	snprintf( buf, sizeof buf, "%s.lock", fname );
51
52	if ( (*lfp = fopen( buf, "w" )) == NULL ) {
53		Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", buf, 0, 0 );
54
55		return( NULL );
56	}
57
58	/* acquire the lock */
59	ldap_lockf( fileno(*lfp) );
60
61	/* open the log file */
62	if ( (fp = fopen( fname, type )) == NULL ) {
63		Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", fname, 0, 0 );
64
65		ldap_unlockf( fileno(*lfp) );
66		fclose( *lfp );
67		*lfp = NULL;
68		return( NULL );
69	}
70
71	return( fp );
72}
73
74int
75lock_fclose( FILE *fp, FILE *lfp )
76{
77	int rc = fclose( fp );
78	/* unlock */
79	ldap_unlockf( fileno(lfp) );
80	fclose( lfp );
81
82	return( rc );
83}
84