Annotation of src/usr.bin/nohup/nohup.c, Revision 1.8
1.8 ! mpech 1: /* $OpenBSD: nohup.c,v 1.7 2001/08/19 18:54:47 mickey 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
1.8 ! mpech 47: static char rcsid[] = "$OpenBSD: nohup.c,v 1.7 2001/08/19 18:54:47 mickey 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:
62: static void dofile();
63: static void usage();
64:
65: /* nohup shall exit with one of the following values:
66: 126 - The utility was found but could not be invoked.
1.8 ! mpech 67: 127 - An error occurred in the nohup utility, or the utility could
1.1 deraadt 68: not be found. */
69: #define EXIT_NOEXEC 126
70: #define EXIT_NOTFOUND 127
71: #define EXIT_MISC 127
72:
73: int
74: main(argc, argv)
75: int argc;
76: char **argv;
77: {
78: int exit_status;
79:
80: if (argc < 2)
81: usage();
82:
83: if (isatty(STDOUT_FILENO))
84: dofile();
85: if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1) {
86: /* may have just closed stderr */
87: (void)fprintf(stdin, "nohup: %s\n", strerror(errno));
88: exit(EXIT_MISC);
89: }
90:
91: /* The nohup utility shall take the standard action for all signals
92: except that SIGHUP shall be ignored. */
93: (void)signal(SIGHUP, SIG_IGN);
94:
95: execvp(argv[1], &argv[1]);
1.5 deraadt 96: exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC;
1.7 mickey 97: err(exit_status, argv[1]);
1.1 deraadt 98: }
99:
100: static void
101: dofile()
102: {
103: int fd;
104: char *p, path[MAXPATHLEN];
105:
1.7 mickey 106: /* If the standard output is a terminal, all output written to
1.1 deraadt 107: its standard output shall be appended to the end of the file
108: nohup.out in the current directory. If nohup.out cannot be
109: created or opened for appending, the output shall be appended
1.7 mickey 110: to the end of the file nohup.out in the directory specified
1.1 deraadt 111: by the HOME environment variable.
112:
113: If a file is created, the file's permission bits shall be
114: set to S_IRUSR | S_IWUSR. */
115: #define FILENAME "nohup.out"
116: p = FILENAME;
117: if ((fd = open(p, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) >= 0)
118: goto dupit;
1.6 millert 119: if ((p = getenv("HOME")) != NULL && *p != '\0' &&
1.3 millert 120: (strlen(p) + strlen(FILENAME) + 1) < sizeof(path)) {
1.1 deraadt 121: (void)strcpy(path, p);
122: (void)strcat(path, "/");
123: (void)strcat(path, FILENAME);
124: if ((fd = open(p = path, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) >= 0)
125: goto dupit;
126: }
1.7 mickey 127: errx(EXIT_MISC, "can't open a nohup.out file");
1.1 deraadt 128:
1.4 deraadt 129: dupit: (void)lseek(fd, 0, SEEK_END);
1.7 mickey 130: if (dup2(fd, STDOUT_FILENO) == -1)
131: err(EXIT_MISC, NULL);
1.1 deraadt 132: (void)fprintf(stderr, "sending output to %s\n", p);
133: }
134:
135: static void
136: usage()
137: {
138: (void)fprintf(stderr, "usage: nohup command\n");
139: exit(EXIT_MISC);
140: }
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