Annotation of src/usr.bin/nohup/nohup.c, Revision 1.14
1.14 ! deraadt 1: /* $OpenBSD: nohup.c,v 1.13 2007/10/16 20:19:27 sobrado 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.
1.12 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: #include <sys/param.h>
34: #include <sys/file.h>
35: #include <sys/stat.h>
36: #include <fcntl.h>
37: #include <unistd.h>
38: #include <signal.h>
39: #include <stdio.h>
40: #include <stdlib.h>
41: #include <string.h>
42: #include <errno.h>
1.7 mickey 43: #include <err.h>
1.1 deraadt 44:
1.11 cloder 45: static void dofile(void);
46: __dead static void usage(void);
1.1 deraadt 47:
1.11 cloder 48: /*
49: * nohup shall exit with one of the following values:
50: * 126 - The utility was found but could not be invoked.
51: * 127 - An error occurred in the nohup utility, or the utility could
52: * not be found.
53: */
1.1 deraadt 54: #define EXIT_NOEXEC 126
55: #define EXIT_NOTFOUND 127
56: #define EXIT_MISC 127
57:
1.11 cloder 58: /*
59: * If the standard output is a terminal, all output written to
60: * its standard output shall be appended to the end of the file
61: * nohup.out in the current directory. If nohup.out cannot be
62: * created or opened for appending, the output shall be appended
63: * to the end of the file nohup.out in the directory specified
64: * by the HOME environment variable.
65: *
66: * If a file is created, the file's permission bits shall be
67: * set to S_IRUSR | S_IWUSR.
68: */
69: #define FILENAME "nohup.out"
70:
1.1 deraadt 71: int
1.11 cloder 72: main(int argc, char *argv[])
1.1 deraadt 73: {
74: int exit_status;
75:
76: if (argc < 2)
77: usage();
78:
79: if (isatty(STDOUT_FILENO))
80: dofile();
81: if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1) {
82: /* may have just closed stderr */
83: (void)fprintf(stdin, "nohup: %s\n", strerror(errno));
84: exit(EXIT_MISC);
85: }
86:
1.11 cloder 87: /*
88: * The nohup utility shall take the standard action for all signals
89: * except that SIGHUP shall be ignored.
90: */
1.1 deraadt 91: (void)signal(SIGHUP, SIG_IGN);
92:
93: execvp(argv[1], &argv[1]);
1.5 deraadt 94: exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC;
1.10 cloder 95: err(exit_status, "%s", argv[1]);
1.1 deraadt 96: }
97:
98: static void
1.11 cloder 99: dofile(void)
1.1 deraadt 100: {
101: int fd;
1.11 cloder 102: const char *p;
103: char path[MAXPATHLEN];
1.1 deraadt 104:
105: p = FILENAME;
106: if ((fd = open(p, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) >= 0)
107: goto dupit;
1.6 millert 108: if ((p = getenv("HOME")) != NULL && *p != '\0' &&
1.3 millert 109: (strlen(p) + strlen(FILENAME) + 1) < sizeof(path)) {
1.11 cloder 110: (void)strlcpy(path, p, sizeof(path));
111: (void)strlcat(path, "/", sizeof(path));
112: (void)strlcat(path, FILENAME, sizeof(path));
1.1 deraadt 113: if ((fd = open(p = path, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) >= 0)
114: goto dupit;
115: }
1.7 mickey 116: errx(EXIT_MISC, "can't open a nohup.out file");
1.1 deraadt 117:
1.11 cloder 118: dupit:
119: (void)lseek(fd, (off_t)0, SEEK_END);
1.7 mickey 120: if (dup2(fd, STDOUT_FILENO) == -1)
121: err(EXIT_MISC, NULL);
1.1 deraadt 122: (void)fprintf(stderr, "sending output to %s\n", p);
123: }
124:
1.11 cloder 125: __dead static void
126: usage(void)
1.1 deraadt 127: {
1.13 sobrado 128: (void)fprintf(stderr, "usage: nohup utility [arg ...]\n");
1.1 deraadt 129: exit(EXIT_MISC);
130: }
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