Annotation of src/usr.bin/nohup/nohup.c, Revision 1.13
1.13 ! sobrado 1: /* $OpenBSD: nohup.c,v 1.12 2003/06/03 02:56:14 millert 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: #ifndef lint
34: char copyright[] =
35: "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
36: All rights reserved.\n";
37: #endif /* not lint */
38:
39: #ifndef lint
40: #if 0
41: static char sccsid[] = "@(#)nohup.c 5.4 (Berkeley) 6/1/90";
42: #endif
1.13 ! sobrado 43: static char rcsid[] = "$OpenBSD: nohup.c,v 1.12 2003/06/03 02:56:14 millert Exp $";
1.1 deraadt 44: #endif /* not lint */
45:
46: #include <sys/param.h>
47: #include <sys/file.h>
48: #include <sys/stat.h>
49: #include <fcntl.h>
50: #include <unistd.h>
51: #include <signal.h>
52: #include <stdio.h>
53: #include <stdlib.h>
54: #include <string.h>
55: #include <errno.h>
1.7 mickey 56: #include <err.h>
1.1 deraadt 57:
1.11 cloder 58: static void dofile(void);
59: __dead static void usage(void);
1.1 deraadt 60:
1.11 cloder 61: /*
62: * nohup shall exit with one of the following values:
63: * 126 - The utility was found but could not be invoked.
64: * 127 - An error occurred in the nohup utility, or the utility could
65: * not be found.
66: */
1.1 deraadt 67: #define EXIT_NOEXEC 126
68: #define EXIT_NOTFOUND 127
69: #define EXIT_MISC 127
70:
1.11 cloder 71: /*
72: * If the standard output is a terminal, all output written to
73: * its standard output shall be appended to the end of the file
74: * nohup.out in the current directory. If nohup.out cannot be
75: * created or opened for appending, the output shall be appended
76: * to the end of the file nohup.out in the directory specified
77: * by the HOME environment variable.
78: *
79: * If a file is created, the file's permission bits shall be
80: * set to S_IRUSR | S_IWUSR.
81: */
82: #define FILENAME "nohup.out"
83:
1.1 deraadt 84: int
1.11 cloder 85: main(int argc, char *argv[])
1.1 deraadt 86: {
87: int exit_status;
88:
89: if (argc < 2)
90: usage();
91:
92: if (isatty(STDOUT_FILENO))
93: dofile();
94: if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1) {
95: /* may have just closed stderr */
96: (void)fprintf(stdin, "nohup: %s\n", strerror(errno));
97: exit(EXIT_MISC);
98: }
99:
1.11 cloder 100: /*
101: * The nohup utility shall take the standard action for all signals
102: * except that SIGHUP shall be ignored.
103: */
1.1 deraadt 104: (void)signal(SIGHUP, SIG_IGN);
105:
106: execvp(argv[1], &argv[1]);
1.5 deraadt 107: exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC;
1.10 cloder 108: err(exit_status, "%s", argv[1]);
1.1 deraadt 109: }
110:
111: static void
1.11 cloder 112: dofile(void)
1.1 deraadt 113: {
114: int fd;
1.11 cloder 115: const char *p;
116: char path[MAXPATHLEN];
1.1 deraadt 117:
118: p = FILENAME;
119: if ((fd = open(p, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) >= 0)
120: goto dupit;
1.6 millert 121: if ((p = getenv("HOME")) != NULL && *p != '\0' &&
1.3 millert 122: (strlen(p) + strlen(FILENAME) + 1) < sizeof(path)) {
1.11 cloder 123: (void)strlcpy(path, p, sizeof(path));
124: (void)strlcat(path, "/", sizeof(path));
125: (void)strlcat(path, FILENAME, sizeof(path));
1.1 deraadt 126: if ((fd = open(p = path, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) >= 0)
127: goto dupit;
128: }
1.7 mickey 129: errx(EXIT_MISC, "can't open a nohup.out file");
1.1 deraadt 130:
1.11 cloder 131: dupit:
132: (void)lseek(fd, (off_t)0, SEEK_END);
1.7 mickey 133: if (dup2(fd, STDOUT_FILENO) == -1)
134: err(EXIT_MISC, NULL);
1.1 deraadt 135: (void)fprintf(stderr, "sending output to %s\n", p);
136: }
137:
1.11 cloder 138: __dead static void
139: usage(void)
1.1 deraadt 140: {
1.13 ! sobrado 141: (void)fprintf(stderr, "usage: nohup utility [arg ...]\n");
1.1 deraadt 142: exit(EXIT_MISC);
143: }
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