Annotation of src/usr.bin/nohup/nohup.c, Revision 1.5
1.5 ! deraadt 1: /* $OpenBSD: nohup.c,v 1.4 1997/06/20 13:31:17 deraadt 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
1.5 ! deraadt 47: static char rcsid[] = "$OpenBSD: nohup.c,v 1.4 1997/06/20 13:31:17 deraadt 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>
60:
61: static void dofile();
62: static void usage();
63:
64: /* nohup shall exit with one of the following values:
65: 126 - The utility was found but could not be invoked.
66: 127 - An error occured in the nohup utility, or the utility could
67: not be found. */
68: #define EXIT_NOEXEC 126
69: #define EXIT_NOTFOUND 127
70: #define EXIT_MISC 127
71:
72: int
73: main(argc, argv)
74: int argc;
75: char **argv;
76: {
77: int exit_status;
78:
79: if (argc < 2)
80: usage();
81:
82: if (isatty(STDOUT_FILENO))
83: dofile();
84: if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1) {
85: /* may have just closed stderr */
86: (void)fprintf(stdin, "nohup: %s\n", strerror(errno));
87: exit(EXIT_MISC);
88: }
89:
90: /* The nohup utility shall take the standard action for all signals
91: except that SIGHUP shall be ignored. */
92: (void)signal(SIGHUP, SIG_IGN);
93:
94: execvp(argv[1], &argv[1]);
1.5 ! deraadt 95: exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC;
1.1 deraadt 96: (void)fprintf(stderr, "nohup: %s: %s\n", argv[1], strerror(errno));
97: exit(exit_status);
98: }
99:
100: static void
101: dofile()
102: {
103: int fd;
104: char *p, path[MAXPATHLEN];
105:
106: /* If the standard output is a terminal, all output written to
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
110: to the end of the file nohup.out in the directory specified
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;
1.3 millert 119: if ((p = getenv("HOME")) != NULL &&
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: }
127: (void)fprintf(stderr, "nohup: can't open a nohup.out file.\n");
128: exit(EXIT_MISC);
129:
1.4 deraadt 130: dupit: (void)lseek(fd, 0, SEEK_END);
1.1 deraadt 131: if (dup2(fd, STDOUT_FILENO) == -1) {
132: (void)fprintf(stderr, "nohup: %s\n", strerror(errno));
133: exit(EXIT_MISC);
134: }
135: (void)fprintf(stderr, "sending output to %s\n", p);
136: }
137:
138: static void
139: usage()
140: {
141: (void)fprintf(stderr, "usage: nohup command\n");
142: exit(EXIT_MISC);
143: }
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