Annotation of src/usr.bin/nohup/nohup.c, Revision 1.11
1.11 ! cloder 1: /* $OpenBSD: nohup.c,v 1.10 2003/02/16 03:09:50 cloder Exp $ */
1.1 deraadt 2: /* $NetBSD: nohup.c,v 1.6 1995/08/31 23:35:25 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1989 The Regents of the University of California.
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: char 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
1.11 ! cloder 47: static char rcsid[] = "$OpenBSD: nohup.c,v 1.10 2003/02/16 03:09:50 cloder Exp $";
1.1 deraadt 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>
1.7 mickey 60: #include <err.h>
1.1 deraadt 61:
1.11 ! cloder 62: static void dofile(void);
! 63: __dead static void usage(void);
1.1 deraadt 64:
1.11 ! cloder 65: /*
! 66: * nohup shall exit with one of the following values:
! 67: * 126 - The utility was found but could not be invoked.
! 68: * 127 - An error occurred in the nohup utility, or the utility could
! 69: * not be found.
! 70: */
1.1 deraadt 71: #define EXIT_NOEXEC 126
72: #define EXIT_NOTFOUND 127
73: #define EXIT_MISC 127
74:
1.11 ! cloder 75: /*
! 76: * If the standard output is a terminal, all output written to
! 77: * its standard output shall be appended to the end of the file
! 78: * nohup.out in the current directory. If nohup.out cannot be
! 79: * created or opened for appending, the output shall be appended
! 80: * to the end of the file nohup.out in the directory specified
! 81: * by the HOME environment variable.
! 82: *
! 83: * If a file is created, the file's permission bits shall be
! 84: * set to S_IRUSR | S_IWUSR.
! 85: */
! 86: #define FILENAME "nohup.out"
! 87:
1.1 deraadt 88: int
1.11 ! cloder 89: main(int argc, char *argv[])
1.1 deraadt 90: {
91: int exit_status;
92:
93: if (argc < 2)
94: usage();
95:
96: if (isatty(STDOUT_FILENO))
97: dofile();
98: if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1) {
99: /* may have just closed stderr */
100: (void)fprintf(stdin, "nohup: %s\n", strerror(errno));
101: exit(EXIT_MISC);
102: }
103:
1.11 ! cloder 104: /*
! 105: * The nohup utility shall take the standard action for all signals
! 106: * except that SIGHUP shall be ignored.
! 107: */
1.1 deraadt 108: (void)signal(SIGHUP, SIG_IGN);
109:
110: execvp(argv[1], &argv[1]);
1.5 deraadt 111: exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC;
1.10 cloder 112: err(exit_status, "%s", argv[1]);
1.1 deraadt 113: }
114:
115: static void
1.11 ! cloder 116: dofile(void)
1.1 deraadt 117: {
118: int fd;
1.11 ! cloder 119: const char *p;
! 120: char path[MAXPATHLEN];
1.1 deraadt 121:
122: p = FILENAME;
123: if ((fd = open(p, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) >= 0)
124: goto dupit;
1.6 millert 125: if ((p = getenv("HOME")) != NULL && *p != '\0' &&
1.3 millert 126: (strlen(p) + strlen(FILENAME) + 1) < sizeof(path)) {
1.11 ! cloder 127: (void)strlcpy(path, p, sizeof(path));
! 128: (void)strlcat(path, "/", sizeof(path));
! 129: (void)strlcat(path, FILENAME, sizeof(path));
1.1 deraadt 130: if ((fd = open(p = path, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) >= 0)
131: goto dupit;
132: }
1.7 mickey 133: errx(EXIT_MISC, "can't open a nohup.out file");
1.1 deraadt 134:
1.11 ! cloder 135: dupit:
! 136: (void)lseek(fd, (off_t)0, SEEK_END);
1.7 mickey 137: if (dup2(fd, STDOUT_FILENO) == -1)
138: err(EXIT_MISC, NULL);
1.1 deraadt 139: (void)fprintf(stderr, "sending output to %s\n", p);
140: }
141:
1.11 ! cloder 142: __dead static void
! 143: usage(void)
1.1 deraadt 144: {
145: (void)fprintf(stderr, "usage: nohup command\n");
146: exit(EXIT_MISC);
147: }