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daemon.c

/*-
 *
 * daemon - replacement for daemon function.
 *
 * Matt Soffen
 * Copyright (C) 2004 Matt Soffen <matt@soffen.com>
 *
 * Taken from the FreeBSD file (with copyright notice)
 * ------------------------------------------------------------
 * Copyright (c) 1990, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: src/lib/libc/gen/daemon.c,v 1.3 2000/01/27 23:06:14 jasone Exp $
 *
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)daemon.c      8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */

#include <pygui_internal.h>

#include <fcntl.h>
#include <unistd.h>

int
daemon(nochdir, noclose)
      int nochdir, noclose;
{
      int fd;

      switch (fork()) {
      case -1:
            return (-1);
      case 0:
            break;
      default:
            _exit(0);
      }

      if (setsid() == -1)
            return (-1);

      if (!nochdir)
            (void)chdir("/");

      if (!noclose && (fd = _open("/dev/null", O_RDWR, 0)) != -1) {
            (void)dup2(fd, STDIN_FILENO);
            (void)dup2(fd, STDOUT_FILENO);
            (void)dup2(fd, STDERR_FILENO);
            if (fd > 2)
                  (void)_close(fd);
      }
      return (0);
}

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