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Annotation of embedaddon/tmux/compat/daemon.c, revision 1.1

1.1     ! misho       1: /*     $OpenBSD: daemon.c,v 1.6 2005/08/08 08:05:33 espie Exp $ */
        !             2: /*-
        !             3:  * Copyright (c) 1990, 1993
        !             4:  *     The Regents of the University of California.  All rights reserved.
        !             5:  *
        !             6:  * Redistribution and use in source and binary forms, with or without
        !             7:  * modification, are permitted provided that the following conditions
        !             8:  * are met:
        !             9:  * 1. Redistributions of source code must retain the above copyright
        !            10:  *    notice, this list of conditions and the following disclaimer.
        !            11:  * 2. Redistributions in binary form must reproduce the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer in the
        !            13:  *    documentation and/or other materials provided with the distribution.
        !            14:  * 3. Neither the name of the University nor the names of its contributors
        !            15:  *    may be used to endorse or promote products derived from this software
        !            16:  *    without specific prior written permission.
        !            17:  *
        !            18:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            19:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            20:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            21:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            22:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            23:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            24:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            25:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            26:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            27:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            28:  * SUCH DAMAGE.
        !            29:  */
        !            30: 
        !            31: #include <fcntl.h>
        !            32: #include <unistd.h>
        !            33: #include <stdlib.h>
        !            34: 
        !            35: #include "compat.h"
        !            36: 
        !            37: int
        !            38: daemon(int nochdir, int noclose)
        !            39: {
        !            40:        int fd;
        !            41: 
        !            42:        switch (fork()) {
        !            43:        case -1:
        !            44:                return (-1);
        !            45:        case 0:
        !            46:                break;
        !            47:        default:
        !            48:                _exit(0);
        !            49:        }
        !            50: 
        !            51:        if (setsid() == -1)
        !            52:                return (-1);
        !            53: 
        !            54:        if (!nochdir)
        !            55:                (void)chdir("/");
        !            56: 
        !            57:        if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
        !            58:                (void)dup2(fd, STDIN_FILENO);
        !            59:                (void)dup2(fd, STDOUT_FILENO);
        !            60:                (void)dup2(fd, STDERR_FILENO);
        !            61:                if (fd > 2)
        !            62:                        (void)close (fd);
        !            63:        }
        !            64:        return (0);
        !            65: }