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      1 /*	$NetBSD: lock.c,v 1.4 2025/09/05 21:16:25 christos Exp $	*/
      2 
      3 /* lock.c - routines to open and apply an advisory lock to a file */
      4 /* $OpenLDAP$ */
      5 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
      6  *
      7  * Copyright 1998-2024 The OpenLDAP Foundation.
      8  * All rights reserved.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted only as authorized by the OpenLDAP
     12  * Public License.
     13  *
     14  * A copy of this license is available in the file LICENSE in the
     15  * top-level directory of the distribution or, alternatively, at
     16  * <http://www.OpenLDAP.org/license.html>.
     17  */
     18 /* Portions Copyright (c) 1995 Regents of the University of Michigan.
     19  * All rights reserved.
     20  *
     21  * Redistribution and use in source and binary forms are permitted
     22  * provided that this notice is preserved and that due credit is given
     23  * to the University of Michigan at Ann Arbor. The name of the University
     24  * may not be used to endorse or promote products derived from this
     25  * software without specific prior written permission. This software
     26  * is provided ``as is'' without express or implied warranty.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __RCSID("$NetBSD: lock.c,v 1.4 2025/09/05 21:16:25 christos Exp $");
     31 
     32 #include "portable.h"
     33 
     34 #include <stdio.h>
     35 
     36 #include <ac/string.h>
     37 #include <ac/socket.h>
     38 #include <ac/time.h>
     39 #include <ac/unistd.h>
     40 
     41 #ifdef HAVE_SYS_FILE_H
     42 #include <sys/file.h>
     43 #endif
     44 
     45 #include "slap.h"
     46 #include <lutil.h>
     47 
     48 FILE *
     49 lock_fopen( const char *fname, const char *type, FILE **lfp )
     50 {
     51 	FILE	*fp;
     52 	char	buf[MAXPATHLEN];
     53 
     54 	/* open the lock file */
     55 	snprintf( buf, sizeof buf, "%s.lock", fname );
     56 
     57 	if ( (*lfp = fopen( buf, "w" )) == NULL ) {
     58 		Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", buf );
     59 
     60 		return( NULL );
     61 	}
     62 
     63 	/* acquire the lock */
     64 	ldap_lockf( fileno(*lfp) );
     65 
     66 	/* open the log file */
     67 	if ( (fp = fopen( fname, type )) == NULL ) {
     68 		Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", fname );
     69 
     70 		ldap_unlockf( fileno(*lfp) );
     71 		fclose( *lfp );
     72 		*lfp = NULL;
     73 		return( NULL );
     74 	}
     75 
     76 	return( fp );
     77 }
     78 
     79 int
     80 lock_fclose( FILE *fp, FILE *lfp )
     81 {
     82 	int rc = fclose( fp );
     83 	/* unlock */
     84 	ldap_unlockf( fileno(lfp) );
     85 	fclose( lfp );
     86 
     87 	return( rc );
     88 }
     89