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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#if defined(LIBC_SCCS) && !defined(lint) 31static char sccsid[] = "@(#)daemon.c 8.1 (Berkeley) 6/4/93"; 32#endif /* LIBC_SCCS and not lint */ 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: src/lib/libc/gen/daemon.c,v 1.8 2007/01/09 00:27:53 imp Exp $"); 35 36#ifndef VARIANT_PRE1050 37#include <mach/mach.h> 38#include <servers/bootstrap.h> 39#endif /* !VARIANT_PRE1050 */ 40#include "namespace.h" 41#include <errno.h> 42#include <fcntl.h> 43#include <paths.h> 44#include <stdlib.h> 45#include <signal.h> 46#include <unistd.h> 47#include "un-namespace.h" 48 49#ifndef VARIANT_PRE1050 50static void 51move_to_root_bootstrap(void) 52{ 53 mach_port_t parent_port = 0; 54 mach_port_t previous_port = 0; 55 56 do { 57 if (previous_port) { 58 mach_port_deallocate(mach_task_self(), previous_port); 59 previous_port = parent_port; 60 } else { 61 previous_port = bootstrap_port; 62 } 63 64 if (bootstrap_parent(previous_port, &parent_port) != 0) { 65 return; 66 } 67 } while (parent_port != previous_port); 68 69 task_set_bootstrap_port(mach_task_self(), parent_port); 70 bootstrap_port = parent_port; 71} 72#endif /* !VARIANT_PRE1050 */ 73 74int daemon(int, int) __DARWIN_1050(daemon); 75 76int 77daemon(nochdir, noclose) 78 int nochdir, noclose; 79{ 80 struct sigaction osa, sa; 81 int fd; 82 pid_t newgrp; 83 int oerrno; 84 int osa_ok; 85 86 /* A SIGHUP may be thrown when the parent exits below. */ 87 sigemptyset(&sa.sa_mask); 88 sa.sa_handler = SIG_IGN; 89 sa.sa_flags = 0; 90 osa_ok = _sigaction(SIGHUP, &sa, &osa); 91#ifndef VARIANT_PRE1050 92 move_to_root_bootstrap(); 93#endif /* !VARIANT_PRE1050 */ 94 switch (fork()) { 95 case -1: 96 return (-1); 97 case 0: 98 break; 99 default: 100 _exit(0); 101 } 102 103 newgrp = setsid(); 104 oerrno = errno; 105 if (osa_ok != -1) 106 _sigaction(SIGHUP, &osa, NULL); 107 108 if (newgrp == -1) { 109 errno = oerrno; 110 return (-1); 111 } 112 113 if (!nochdir) 114 (void)chdir("/"); 115 116 if (!noclose && (fd = _open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 117 (void)_dup2(fd, STDIN_FILENO); 118 (void)_dup2(fd, STDOUT_FILENO); 119 (void)_dup2(fd, STDERR_FILENO); 120 if (fd > 2) 121 (void)_close(fd); 122 } 123 return (0); 124} 125