/***************************************************************************** * * $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; }