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143 lines
2.9 KiB
C
143 lines
2.9 KiB
C
/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 1998-2005 The OpenLDAP Foundation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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/* Portions Copyright (c) 1996 Regents of the University of Michigan.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and that due credit is given
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* to the University of Michigan at Ann Arbor. The name of the University
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* may not be used to endorse or promote products derived from this
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* software without specific prior written permission. This software
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* is provided ``as is'' without express or implied warranty.
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*/
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/* ACKNOWLEDGEMENTS:
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* This work was originally developed by the University of Michigan
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* (as part of U-MICH LDAP).
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*/
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/*
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* lock.c - routines to open and apply an advisory lock to a file
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/param.h>
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#include <ac/string.h>
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#include <ac/socket.h>
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#include <ac/time.h>
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#include <ac/unistd.h>
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#ifdef HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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#include "slurp.h"
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FILE *
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lock_fopen(
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const char *fname,
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const char *type,
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FILE **lfp
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)
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{
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FILE *fp;
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char buf[MAXPATHLEN];
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/* open the lock file */
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snprintf( buf, sizeof buf, "%s.lock", fname );
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if ( (*lfp = fopen( buf, "w" )) == NULL ) {
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Debug( LDAP_DEBUG_ANY,
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"Error: could not open \"%s\"\n", buf, 0, 0 );
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return( NULL );
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}
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/* acquire the lock */
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ldap_lockf( fileno(*lfp) );
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/* open the log file */
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if ( (fp = fopen( fname, type )) == NULL ) {
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Debug( LDAP_DEBUG_ANY,
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"Error: could not open \"%s\"\n", fname, 0, 0 );
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ldap_unlockf( fileno(*lfp) );
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fclose( *lfp );
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*lfp = NULL;
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return( NULL );
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}
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return( fp );
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}
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int
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lock_fclose(
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FILE *fp,
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FILE *lfp
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)
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{
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/* unlock */
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ldap_unlockf( fileno(lfp) );
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fclose( lfp );
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return( fclose( fp ) );
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}
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/*
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* Apply an advisory lock on a file. Just calls lock_fopen()
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*/
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int
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acquire_lock(
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const char *file,
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FILE **rfp,
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FILE **lfp
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)
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{
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if (( *rfp = lock_fopen( file, "r+", lfp )) == NULL ) {
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Debug( LDAP_DEBUG_ANY,
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"Error: acquire_lock(%ld): Could not acquire lock on \"%s\"\n",
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(long) getpid(), file, 0);
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return( -1 );
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}
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return( 0 );
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}
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/*
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* Relinquish a lock on a file. Calls lock_fclose() and also removes the
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* lock file.
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*/
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int
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relinquish_lock(
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const char *file,
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FILE *rfp,
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FILE *lfp
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)
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{
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if ( lock_fclose( rfp, lfp ) == EOF ) {
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Debug( LDAP_DEBUG_ANY,
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"Error: relinquish_lock (%ld): Error closing \"%s\"\n",
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(long) getpid(), file, 0 );
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return( -1 );
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}
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return( 0 );
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}
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