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deb-mbse/mbfido/flock.c

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/*****************************************************************************
*
* Purpose ...............: File locker
*
*****************************************************************************
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* Copyright (C) 1997-2009
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*
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* Michiel Broek FIDO: 2:280/2802
* Beekmansbos 10
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* 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)
{
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int lfd=-1;
struct flock fl;
struct stat st;
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if (fn) {
if ((lfd = open(fn, O_RDWR | O_CREAT, 0644)) < 0) {
WriteError("$Error opening file %s", fn);
return -1;
}
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fl.l_type=F_WRLCK;
fl.l_whence=0;
fl.l_start=0L;
fl.l_len=0L;
fl.l_pid=getpid();
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if (fcntl(lfd,F_SETLK,&fl) != 0) {
if (errno != EAGAIN)
Syslog('+', "Error locking file %s",fn);
close(lfd);
return -1;
}
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if (stat(fn,&st) != 0) {
WriteError("$Error accessing file %s",fn);
close(lfd);
return -1;
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}
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}
return lfd;
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}
void funlock(int fd)
{
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close(fd);
return;
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}