1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char copyright[] = 10 "@(#) Copyright (c) 1989, 1993\n\ 11 The Regents of the University of California. All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)nohup.c 8.1 (Berkeley) 06/06/93"; 16 #endif /* not lint */ 17 18 #include <sys/param.h> 19 #include <sys/stat.h> 20 21 #include <errno.h> 22 #include <fcntl.h> 23 #include <signal.h> 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include <string.h> 27 #include <unistd.h> 28 29 void dofile __P((void)); 30 void usage __P((void)); 31 32 int 33 main(argc, argv) 34 int argc; 35 char *argv[]; 36 { 37 if (argc < 2) 38 usage(); 39 40 if (isatty(STDOUT_FILENO)) 41 dofile(); 42 if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1) { 43 /* may have just closed stderr */ 44 (void)fprintf(stdin, "nohup: %s\n", strerror(errno)); 45 exit(1); 46 } 47 48 (void)signal(SIGHUP, SIG_IGN); 49 (void)signal(SIGQUIT, SIG_IGN); 50 51 execvp(argv[1], &argv[1]); 52 (void)fprintf(stderr, 53 "nohup: %s: %s\n", argv[1], strerror(errno)); 54 exit(1); 55 } 56 57 void 58 dofile() 59 { 60 int fd; 61 char *p, path[MAXPATHLEN]; 62 63 #define FILENAME "nohup.out" 64 p = FILENAME; 65 if ((fd = open(p, O_RDWR|O_CREAT, S_IRUSR | S_IWUSR)) >= 0) 66 goto dupit; 67 if (p = getenv("HOME")) { 68 (void)strcpy(path, p); 69 (void)strcat(path, "/"); 70 (void)strcat(path, FILENAME); 71 if ((fd = open(p = path, 72 O_RDWR|O_CREAT, S_IRUSR | S_IWUSR)) >= 0) 73 goto dupit; 74 } 75 (void)fprintf(stderr, "nohup: can't open a nohup.out file.\n"); 76 exit(1); 77 78 dupit: (void)lseek(fd, (off_t)0, SEEK_END); 79 if (dup2(fd, STDOUT_FILENO) == -1) { 80 (void)fprintf(stderr, "nohup: %s\n", strerror(errno)); 81 exit(1); 82 } 83 (void)fprintf(stderr, "sending output to %s\n", p); 84 } 85 86 void 87 usage() 88 { 89 (void)fprintf(stderr, "usage: nohup command\n"); 90 exit(1); 91 } 92