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Member "amavisd-milter-1.7.2/compat/daemon.c" (21 Jan 2019, 2369 Bytes) of package /linux/privat/amavisd-milter-1.7.2.tar.gz:


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    1 /* OPENBSD ORIGINAL: lib/libc/gen/daemon.c */
    2 
    3 /*  $OpenBSD: daemon.c,v 1.6 2005/08/08 08:05:33 espie Exp $ */
    4 /*-
    5  * Copyright (c) 1990, 1993
    6  *  The Regents of the University of California.  All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #include "compat.h"
   34 
   35 int
   36 daemon(int nochdir, int noclose)
   37 {
   38     int fd;
   39 
   40     switch (fork()) {
   41     case -1:
   42         return (-1);
   43     case 0:
   44 #ifdef HAVE_CYGWIN
   45         register_9x_service();
   46 #endif
   47         break;
   48     default:
   49 #ifdef HAVE_CYGWIN
   50         /*
   51          * This sleep avoids a race condition which kills the
   52          * child process if parent is started by a NT/W2K service.
   53          */
   54         sleep(1);
   55 #endif
   56         _exit(0);
   57     }
   58 
   59     if (setsid() == -1)
   60         return (-1);
   61 
   62     if (!nochdir)
   63         (void)chdir("/");
   64 
   65     if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
   66         (void)dup2(fd, STDIN_FILENO);
   67         (void)dup2(fd, STDOUT_FILENO);
   68         (void)dup2(fd, STDERR_FILENO);
   69         if (fd > 2)
   70             (void)close (fd);
   71     }
   72     return (0);
   73 }