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[/] [or1k/] [trunk/] [linux/] [uClibc/] [libc/] [unistd/] [daemon.c] - Blame information for rev 1771

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Line No. Rev Author Line
1 1325 phoenix
/* vi: set sw=4 ts=4: */
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/* daemon implementation for uClibc
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 *
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 * Copyright (c) 1991, 1993
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 *      The Regents of the University of California.  All rights reserved.
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 *
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 * Modified for uClibc by Erik Andersen <andersee@debian.org>
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 *
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 * This program is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU Library General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or (at your
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 * option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
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 * for more details.
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 *
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 * You should have received a copy of the GNU Library General Public License
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 * along with this program; if not, write to the Free Software Foundation,
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 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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 *
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 * Original copyright notice is retained at the end of this file.
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 */
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#include <stdio.h>
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#include <features.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <unistd.h>
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/* Note that this file should not be compiled in
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 * unless __UCLIBC_HAS_MMU__ is defined */
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int daemon( int nochdir, int noclose )
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{
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        int fd;
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        switch (fork()) {
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                case -1:
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                        return(-1);
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                case 0:
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                        break;
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                default:
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                        _exit(0);
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        }
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        if (setsid() == -1)
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                return(-1);
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        /* Make certain we are not a session leader, or else we
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         * might reacquire a controlling terminal */
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        if (fork())
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                _exit(0);
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        if (!nochdir)
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                chdir("/");
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        if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
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                dup2(fd, STDIN_FILENO);
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                dup2(fd, STDOUT_FILENO);
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                dup2(fd, STDERR_FILENO);
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                if (fd > 2)
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                        close(fd);
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        }
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        return(0);
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}
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/*-
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 * Copyright (c) 1990, 1993
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 *      The Regents of the University of California.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 *
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 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
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 *              ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
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 *
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 * 4. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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