1 /* $NetBSD: nohup.c,v 1.10 2001/09/16 16:34:43 wiz Exp $ */ 2 3 /* 4 * Copyright (c) 1989 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT( 39 "@(#) Copyright (c) 1989 The Regents of the University of California.\n\ 40 All rights reserved.\n"); 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)nohup.c 5.4 (Berkeley) 6/1/90"; 46 #endif 47 __RCSID("$NetBSD: nohup.c,v 1.10 2001/09/16 16:34:43 wiz Exp $"); 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/file.h> 52 #include <sys/stat.h> 53 #include <fcntl.h> 54 #include <unistd.h> 55 #include <signal.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <errno.h> 60 61 static void dofile __P((void)); 62 static void usage __P((void)); 63 int main __P((int, char **)); 64 65 /* nohup shall exit with one of the following values: 66 126 - The utility was found but could not be invoked. 67 127 - An error occurred in the nohup utility, or the utility could 68 not be found. */ 69 #define EXIT_NOEXEC 126 70 #define EXIT_NOTFOUND 127 71 #define EXIT_MISC 127 72 73 int 74 main(argc, argv) 75 int argc; 76 char **argv; 77 { 78 int exit_status; 79 80 while (getopt(argc, argv, "") != -1) { 81 usage(); 82 } 83 argc -= optind; 84 argv += optind; 85 86 if (argc < 1) 87 usage(); 88 89 if (isatty(STDOUT_FILENO)) 90 dofile(); 91 if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1) { 92 /* may have just closed stderr */ 93 (void)fprintf(stdin, "nohup: %s\n", strerror(errno)); 94 exit(EXIT_MISC); 95 } 96 97 /* The nohup utility shall take the standard action for all signals 98 except that SIGHUP shall be ignored. */ 99 (void)signal(SIGHUP, SIG_IGN); 100 101 execvp(argv[0], &argv[0]); 102 exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC; 103 (void)fprintf(stderr, "nohup: %s: %s\n", argv[0], strerror(errno)); 104 exit(exit_status); 105 } 106 107 static void 108 dofile() 109 { 110 int fd; 111 char *p, path[MAXPATHLEN]; 112 113 /* If the standard output is a terminal, all output written to 114 its standard output shall be appended to the end of the file 115 nohup.out in the current directory. If nohup.out cannot be 116 created or opened for appending, the output shall be appended 117 to the end of the file nohup.out in the directory specified 118 by the HOME environment variable. 119 120 If a file is created, the file's permission bits shall be 121 set to S_IRUSR | S_IWUSR. */ 122 #define FILENAME "nohup.out" 123 p = FILENAME; 124 if ((fd = open(p, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) >= 0) 125 goto dupit; 126 if ((p = getenv("HOME")) != NULL) { 127 (void)strcpy(path, p); 128 (void)strcat(path, "/"); 129 (void)strcat(path, FILENAME); 130 if ((fd = open(p = path, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) >= 0) 131 goto dupit; 132 } 133 (void)fprintf(stderr, "nohup: can't open a nohup.out file.\n"); 134 exit(EXIT_MISC); 135 136 dupit: (void)lseek(fd, 0L, SEEK_END); 137 if (dup2(fd, STDOUT_FILENO) == -1) { 138 (void)fprintf(stderr, "nohup: %s\n", strerror(errno)); 139 exit(EXIT_MISC); 140 } 141 (void)fprintf(stderr, "sending output to %s\n", p); 142 } 143 144 static void 145 usage() 146 { 147 (void)fprintf(stderr, "usage: nohup utility [argument ...]\n"); 148 exit(EXIT_MISC); 149 } 150