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/** BEGIN COPYRIGHT BLOCK
* This Program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; version 2 of the License.
*
* This Program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this Program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place, Suite 330, Boston, MA 02111-1307 USA.
*
* In addition, as a special exception, Red Hat, Inc. gives You the additional
* right to link the code of this Program with code not covered under the GNU
* General Public License ("Non-GPL Code") and to distribute linked combinations
* including the two, subject to the limitations in this paragraph. Non-GPL Code
* permitted under this exception must only link to the code of this Program
* through those well defined interfaces identified in the file named EXCEPTION
* found in the source code files (the "Approved Interfaces"). The files of
* Non-GPL Code may instantiate templates or use macros or inline functions from
* the Approved Interfaces without causing the resulting work to be covered by
* the GNU General Public License. Only Red Hat, Inc. may make changes or
* additions to the list of Approved Interfaces. You must obey the GNU General
* Public License in all respects for all of the Program code and other code used
* in conjunction with the Program except the Non-GPL Code covered by this
* exception. If you modify this file, you may extend this exception to your
* version of the file, but you are not obligated to do so. If you do not wish to
* provide this exception without modification, you must delete this exception
* statement from your version and license this file solely under the GPL without
* exception.
*
*
* Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
/* lock.c - routines to open and apply an advisory lock to a file */
#include <stdio.h>
#include <sys/types.h>
#ifndef _WIN32
#include <sys/time.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/socket.h>
#endif
#include "slap.h"
#ifdef USE_LOCKF
#include <unistd.h>
#endif
FILE *
lock_fopen( char *fname, char *type, FILE **lfp )
{
FILE *fp;
char buf[MAXPATHLEN];
/* open the lock file */
PR_snprintf( buf, MAXPATHLEN, "%s%s", fname, ".lock" );
if ( (*lfp = fopen( buf, "w" )) == NULL ) {
LDAPDebug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", buf, 0, 0 );
return( NULL );
}
/* acquire the lock */
#ifdef _WIN32
while ( _locking( _fileno( *lfp ), LK_NBLCK, 0xFFFFFFFF ) != 0 ) {
#else
#ifdef USE_LOCKF
while ( lockf( fileno( *lfp ), F_LOCK, 0 ) != 0 ) {
#else /* _WIN32 */
while ( flock( fileno( *lfp ), LOCK_EX ) != 0 ) {
#endif
#endif /* _WIN32 */
; /* NULL */
}
/* open the log file */
if ( (fp = fopen( fname, type )) == NULL ) {
LDAPDebug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", fname, 0, 0 );
#ifdef _WIN32
_locking( _fileno( *lfp ), LK_UNLCK, 0xFFFFFFFF );
#else /* _WIN32 */
#ifdef USE_LOCKF
lockf( fileno( *lfp ), F_ULOCK, 0 );
#else
flock( fileno( *lfp ), LOCK_UN );
#endif
#endif /* _WIN32 */
return( NULL );
}
return( fp );
}
int
lock_fclose( FILE *fp, FILE *lfp )
{
/* unlock */
#ifdef _WIN32
_locking( _fileno( lfp ), LK_UNLCK, 0xFFFFFFFF );
#else /* _WIN32 */
#ifdef USE_LOCKF
lockf( fileno( lfp ), F_ULOCK, 0 );
#else
flock( fileno( lfp ), LOCK_UN );
#endif
#endif /* _WIN32 */
fclose( lfp );
return( fclose( fp ) );
}
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