79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
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/*****************************************************************************
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*
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* Purpose ...............: File locker
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*
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*****************************************************************************
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* Copyright (C) 1997-2009
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*
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* Michiel Broek FIDO: 2:280/2802
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* Beekmansbos 10
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* 1971 BV IJmuiden
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* the Netherlands
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*
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* This file is part of MBSE BBS.
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*
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* This BBS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* MBSE BBS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MBSE BBS; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*****************************************************************************/
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#include "../config.h"
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#include "../lib/mbselib.h"
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#include "flock.h"
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int f_lock(char *fn)
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{
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int lfd=-1;
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struct flock fl;
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struct stat st;
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if (fn) {
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if ((lfd = open(fn, O_RDWR | O_CREAT, 0644)) < 0) {
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WriteError("$Error opening file %s", fn);
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return -1;
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}
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fl.l_type=F_WRLCK;
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fl.l_whence=0;
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fl.l_start=0L;
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fl.l_len=0L;
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fl.l_pid=getpid();
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if (fcntl(lfd,F_SETLK,&fl) != 0) {
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if (errno != EAGAIN)
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Syslog('+', "Error locking file %s",fn);
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close(lfd);
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return -1;
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}
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if (stat(fn,&st) != 0) {
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WriteError("$Error accessing file %s",fn);
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close(lfd);
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return -1;
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}
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}
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return lfd;
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}
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void funlock(int fd)
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{
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close(fd);
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return;
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}
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