gen/daemon-fbsd.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)daemon.c    8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD: src/lib/libc/gen/daemon.c,v 1.6 2003/11/10 22:01:42 ghelmer Exp $");
  39
  40 #ifndef VARIANT_PRE1050
  41 #include <mach/mach.h>
  42 #include <servers/bootstrap.h>
  43 #endif /* !VARIANT_PRE1050 */
  44 #include "namespace.h"
  45 #include <errno.h>
  46 #include <fcntl.h>
  47 #include <paths.h>
  48 #include <signal.h>
  49 #include <unistd.h>
  50 #include "un-namespace.h"
  51
  52 #ifndef VARIANT_PRE1050
  53 static void
  54 move_to_root_bootstrap(void)
  55 {
  56         mach_port_t parent_port = 0;
  57         mach_port_t previous_port = 0;
  58
  59         do {
  60                 if (previous_port) {
  61                         mach_port_deallocate(mach_task_self(), previous_port);
  62                         previous_port = parent_port;
  63                 } else {
  64                         previous_port = bootstrap_port;
  65                 }
  66
  67                 if (bootstrap_parent(previous_port, &parent_port) != 0) {
  68                         return;
  69                 }
  70         } while (parent_port != previous_port);
  71
  72         task_set_bootstrap_port(mach_task_self(), parent_port);
  73         bootstrap_port = parent_port;
  74 }
  75 #endif /* !VARIANT_PRE1050 */
  76
  77 int daemon(int, int) __DARWIN_1050(daemon);
  78
  79 int
  80 daemon(nochdir, noclose)
  81         int nochdir, noclose;
  82 {
  83         struct sigaction osa, sa;
  84         int fd;
  85         pid_t newgrp;
  86         int oerrno;
  87         int osa_ok;
  88
  89         /* A SIGHUP may be thrown when the parent exits below. */
  90         sigemptyset(&sa.sa_mask);
  91         sa.sa_handler = SIG_IGN;
  92         sa.sa_flags = 0;
  93         osa_ok = _sigaction(SIGHUP, &sa, &osa);
  94 #ifndef VARIANT_PRE1050
  95         move_to_root_bootstrap();
  96 #endif /* !VARIANT_PRE1050 */
  97         switch (fork()) {
  98         case -1:
  99                 return (-1);
 100         case 0:
 101                 break;
 102         default:
 103                 _exit(0);
 104         }
 105
 106         newgrp = setsid();
 107         oerrno = errno;
 108         if (osa_ok != -1)
 109                 _sigaction(SIGHUP, &osa, NULL);
 110
 111         if (newgrp == -1) {
 112                 errno = oerrno;
 113                 return (-1);
 114         }
 115
 116         if (!nochdir)
 117                 (void)chdir("/");
 118
 119         if (!noclose && (fd = _open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
 120                 (void)_dup2(fd, STDIN_FILENO);
 121                 (void)_dup2(fd, STDOUT_FILENO);
 122                 (void)_dup2(fd, STDERR_FILENO);
 123                 if (fd > 2)
 124                         (void)_close(fd);
 125         }
 126         return (0);
 127 }