This repository has been archived on 2024-04-08. You can view files and clone it, but cannot push or open issues or pull requests.
deb-mbse/mbfido/flock.c
2009-05-15 22:01:56 +02:00

82 lines
1.9 KiB
C

/*****************************************************************************
*
* $Id: flock.c,v 1.5 2004/02/21 17:22:02 mbroek Exp $
* Purpose ...............: File locker
*
*****************************************************************************
* Copyright (C) 1997-2004
*
* Michiel Broek FIDO: 2:2801/16
* Beekmansbos 10 Internet: mbroek@ux123.pttnwb.nl
* 1971 BV IJmuiden
* the Netherlands
*
* This file is part of MBSE BBS.
*
* This BBS 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; either version 2, or (at your option) any
* later version.
*
* MBSE BBS 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 MBSE BBS; see the file COPYING. If not, write to the Free
* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*****************************************************************************/
#include "../config.h"
#include "../lib/mbselib.h"
#include "flock.h"
int f_lock(char *fn)
{
int lfd=-1;
struct flock fl;
struct stat st;
if (fn) {
if ((lfd = open(fn,O_RDWR | O_CREAT)) < 0) {
perror("");
WriteError("Error opening file %s", fn);
return -1;
}
fl.l_type=F_WRLCK;
fl.l_whence=0;
fl.l_start=0L;
fl.l_len=0L;
fl.l_pid=getpid();
if (fcntl(lfd,F_SETLK,&fl) != 0) {
if (errno != EAGAIN)
Syslog('+', "Error locking file %s",fn);
close(lfd);
return -1;
}
if (stat(fn,&st) != 0) {
perror("");
WriteError("Error accessing file %s",fn);
close(lfd);
return -1;
}
}
return lfd;
}
void funlock(int fd)
{
close(fd);
return;
}