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