1 /* 2 * Copyright (c) 1989, 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 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1989, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)nohup.c 8.1 (Berkeley) 6/6/93"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD$"; 46 #endif /* not lint */ 47 48 #include <sys/param.h> 49 #include <sys/stat.h> 50 51 #include <err.h> 52 #include <errno.h> 53 #include <fcntl.h> 54 #include <signal.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 void dofile __P((void)); 61 static void usage __P((void)); 62 63 int 64 main(argc, argv) 65 int argc; 66 char *argv[]; 67 { 68 if (argc < 2) 69 usage(); 70 71 if (isatty(STDOUT_FILENO)) 72 dofile(); 73 if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1) { 74 /* may have just closed stderr */ 75 (void)fprintf(stdin, "nohup: %s\n", strerror(errno)); 76 exit(1); 77 } 78 79 (void)signal(SIGHUP, SIG_IGN); 80 (void)signal(SIGQUIT, SIG_IGN); 81 82 execvp(argv[1], &argv[1]); 83 err(1, "%s", argv[1]); 84 } 85 86 void 87 dofile() 88 { 89 int append; 90 int fd; 91 char *p, path[MAXPATHLEN]; 92 93 #define FILENAME "nohup.out" 94 p = FILENAME; 95 append = !access(p, F_OK); 96 if ((fd = open(p, O_RDWR|O_CREAT, S_IRUSR | S_IWUSR)) >= 0) 97 goto dupit; 98 if ((p = getenv("HOME"))) { 99 (void)strcpy(path, p); 100 (void)strcat(path, "/"); 101 (void)strcat(path, FILENAME); 102 append = !access(path, F_OK); 103 if ((fd = open(p = path, 104 O_RDWR|O_CREAT, S_IRUSR | S_IWUSR)) >= 0) 105 goto dupit; 106 } 107 errx(1, "can't open a nohup.out file"); 108 109 dupit: (void)lseek(fd, (off_t)0, SEEK_END); 110 if (dup2(fd, STDOUT_FILENO) == -1) 111 err(1, NULL); 112 if (append) 113 (void)fprintf(stderr, "appending output to existing %s\n", p); 114 else 115 (void)fprintf(stderr, "sending output to %s\n", p); 116 } 117 118 void 119 usage() 120 { 121 (void)fprintf(stderr, "usage: nohup command [arguments]\n"); 122 exit(1); 123 } 124