1/* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * Portions copyright (c) 2007 Apple Inc. 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#if 0 32#ifndef lint 33static const char copyright[] = 34"@(#) Copyright (c) 1989, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36#endif /* not lint */ 37 38#ifndef lint 39static char sccsid[] = "@(#)nohup.c 8.1 (Berkeley) 6/6/93"; 40#endif /* not lint */ 41#endif 42#include <sys/cdefs.h> 43#ifndef __APPLE__ 44__FBSDID("$FreeBSD: src/usr.bin/nohup/nohup.c,v 1.10 2003/05/03 19:44:46 obrien Exp $"); 45#endif 46 47#include <sys/param.h> 48#include <sys/stat.h> 49 50#include <err.h> 51#include <errno.h> 52#include <fcntl.h> 53#include <signal.h> 54#include <stdio.h> 55#include <stdlib.h> 56#include <string.h> 57#include <unistd.h> 58 59#ifdef __APPLE__ 60#include <TargetConditionals.h> 61#include <vproc.h> 62#include <vproc_priv.h> 63#endif 64 65static void dofile(void); 66static void usage(void); 67 68#define FILENAME "nohup.out" 69/* 70 * POSIX mandates that we exit with: 71 * 126 - If the utility was found, but failed to execute. 72 * 127 - If any other error occurred. 73 */ 74#define EXIT_NOEXEC 126 75#define EXIT_NOTFOUND 127 76#define EXIT_MISC 127 77 78int 79main(int argc, char *argv[]) 80{ 81 int exit_status; 82 83 while (getopt(argc, argv, "") != -1) 84 usage(); 85 argc -= optind; 86 argv += optind; 87 if (argc < 1) 88 usage(); 89 90 if (isatty(STDOUT_FILENO)) 91 dofile(); 92 if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1) 93 /* may have just closed stderr */ 94 err(EXIT_MISC, "%s", argv[0]); 95 96 (void)signal(SIGHUP, SIG_IGN); 97 98#if defined(__APPLE__) && !TARGET_OS_EMBEDDED 99 if (_vprocmgr_detach_from_console(0) != NULL) 100 err(EXIT_MISC, "can't detach from console"); 101#endif 102 execvp(*argv, argv); 103 exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC; 104 err(exit_status, "%s", argv[0]); 105} 106 107static void 108dofile(void) 109{ 110 int fd; 111 char path[MAXPATHLEN]; 112 const char *p; 113 114 /* 115 * POSIX mandates if the standard output is a terminal, the standard 116 * output is appended to nohup.out in the working directory. Failing 117 * that, it will be appended to nohup.out in the directory obtained 118 * from the HOME environment variable. If file creation is required, 119 * the mode_t is set to S_IRUSR | S_IWUSR. 120 */ 121 p = FILENAME; 122 fd = open(p, O_RDWR | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR); 123 if (fd != -1) 124 goto dupit; 125 if ((p = getenv("HOME")) != NULL && *p != '\0' && 126 (size_t)snprintf(path, sizeof(path), "%s/%s", p, FILENAME) < 127 sizeof(path)) { 128 fd = open(p = path, O_RDWR | O_CREAT | O_APPEND, 129 S_IRUSR | S_IWUSR); 130 if (fd != -1) 131 goto dupit; 132 } 133 errx(EXIT_MISC, "can't open a nohup.out file"); 134 135dupit: 136#ifdef __APPLE__ 137 (void)lseek(fd, 0L, SEEK_END); 138#endif 139 if (dup2(fd, STDOUT_FILENO) == -1) 140 err(EXIT_MISC, NULL); 141 (void)fprintf(stderr, "appending output to %s\n", p); 142} 143 144static void 145usage(void) 146{ 147 (void)fprintf(stderr, "usage: nohup [--] utility [arguments]\n"); 148 exit(EXIT_MISC); 149} 150