129 lines
2.5 KiB
C
129 lines
2.5 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/* $XConsortium: lock.c /main/5 1996/11/08 02:07:28 cde-fuj $ */
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/*
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* (c) Copyright 1995 FUJITSU LIMITED
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* This is source code modified by FUJITSU LIMITED under the Joint
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* Development Agreement for the CDEnext PST.
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* This is unpublished proprietary source code of FUJITSU LIMITED
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "udcutil.h"
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/*
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* FileLock( fd )
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* fd: file descripter
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*
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* lock a file by a writing mode
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*
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* normal end : 0
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* abnormal end : -1
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*
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*/
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int
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FileLock( int fd )
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{
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struct flock flpar;
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flpar.l_type = F_RDLCK;
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flpar.l_start = 0;
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flpar.l_len = 0;
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flpar.l_whence = 0;
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if ( fcntl( fd, F_SETLK, &flpar ) == -1 ) {
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USAGE("Write lock not success \n" );
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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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* FileUnLock( fd )
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*
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* free a file by a writing mode
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*
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* normal end : 0
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* abnormal end : -1
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*/
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int
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FileUnLock( int fd )
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{
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struct flock flpar;
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flpar.l_type = F_UNLCK;
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flpar.l_start = 0;
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flpar.l_len = 0;
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flpar.l_whence = 0;
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if ( fcntl( fd, F_SETLK, &flpar ) == -1 ){
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USAGE("File unlock not success \n" );
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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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* isLock( fd )
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*
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* search whether file is locked by a writing mode
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*
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* 1 : file is locked by a writing mode
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* 0 : file isn't locked by a writing mode
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*/
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int
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isLock( int fd )
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{
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struct flock flpar;
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flpar.l_type = F_WRLCK;
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flpar.l_start = 0;
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flpar.l_len = 0;
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flpar.l_whence = 0;
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if ( fcntl( fd, F_GETLK, &flpar ) == -1 ) {
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USAGE("Inquiry of file lock not sucess \n" );
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return -1;
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}
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if ( flpar.l_type == F_UNLCK ){
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return 0 ;
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} else {
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return 1 ;
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}
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}
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