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Annotation of embedaddon/tmux/compat/daemon.c, revision 1.1.1.1

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: }