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