11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1990, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * Redistribution and use in source and binary forms, with or without 61573Srgrimes * modification, are permitted provided that the following conditions 71573Srgrimes * are met: 81573Srgrimes * 1. Redistributions of source code must retain the above copyright 91573Srgrimes * notice, this list of conditions and the following disclaimer. 101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer in the 121573Srgrimes * documentation and/or other materials provided with the distribution. 131573Srgrimes * 4. Neither the name of the University nor the names of its contributors 141573Srgrimes * may be used to endorse or promote products derived from this software 151573Srgrimes * without specific prior written permission. 161573Srgrimes * 171573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271573Srgrimes * SUCH DAMAGE. 281573Srgrimes */ 291573Srgrimes 301573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 311573Srgrimesstatic char sccsid[] = "@(#)daemon.c 8.1 (Berkeley) 6/4/93"; 321573Srgrimes#endif /* LIBC_SCCS and not lint */ 3390039Sobrien#include <sys/cdefs.h> 3490039Sobrien__FBSDID("$FreeBSD: releng/11.0/lib/libc/gen/daemon.c 287292 2015-08-29 14:25:01Z kib $"); 351573Srgrimes 3671579Sdeischen#include "namespace.h" 37122442Sghelmer#include <errno.h> 381573Srgrimes#include <fcntl.h> 391573Srgrimes#include <paths.h> 40150065Sstefanf#include <stdlib.h> 41122442Sghelmer#include <signal.h> 421573Srgrimes#include <unistd.h> 4371579Sdeischen#include "un-namespace.h" 44287292Skib#include "libc_private.h" 451573Srgrimes 461573Srgrimesint 47287292Skibdaemon(int nochdir, int noclose) 481573Srgrimes{ 49122442Sghelmer struct sigaction osa, sa; 501573Srgrimes int fd; 51122442Sghelmer pid_t newgrp; 52122442Sghelmer int oerrno; 53122442Sghelmer int osa_ok; 541573Srgrimes 55122442Sghelmer /* A SIGHUP may be thrown when the parent exits below. */ 56122442Sghelmer sigemptyset(&sa.sa_mask); 57122442Sghelmer sa.sa_handler = SIG_IGN; 58122442Sghelmer sa.sa_flags = 0; 59287292Skib osa_ok = __libc_sigaction(SIGHUP, &sa, &osa); 60122442Sghelmer 611573Srgrimes switch (fork()) { 621573Srgrimes case -1: 631573Srgrimes return (-1); 641573Srgrimes case 0: 651573Srgrimes break; 661573Srgrimes default: 67205165Sphk /* 68205165Sphk * A fine point: _exit(0), not exit(0), to avoid triggering 69205165Sphk * atexit(3) processing 70205165Sphk */ 711573Srgrimes _exit(0); 721573Srgrimes } 731573Srgrimes 74122442Sghelmer newgrp = setsid(); 75122442Sghelmer oerrno = errno; 76122442Sghelmer if (osa_ok != -1) 77287292Skib __libc_sigaction(SIGHUP, &osa, NULL); 78122442Sghelmer 79122442Sghelmer if (newgrp == -1) { 80122442Sghelmer errno = oerrno; 811573Srgrimes return (-1); 82122442Sghelmer } 831573Srgrimes 841573Srgrimes if (!nochdir) 851573Srgrimes (void)chdir("/"); 861573Srgrimes 8756698Sjasone if (!noclose && (fd = _open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 8871579Sdeischen (void)_dup2(fd, STDIN_FILENO); 8971579Sdeischen (void)_dup2(fd, STDOUT_FILENO); 9071579Sdeischen (void)_dup2(fd, STDERR_FILENO); 911573Srgrimes if (fd > 2) 9256698Sjasone (void)_close(fd); 931573Srgrimes } 941573Srgrimes return (0); 951573Srgrimes} 96