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ff1e47a2 WJ |
1 | /* |
2 | * Copyright (c) 1989 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | char copyright[] = | |
36 | "@(#) Copyright (c) 1989 The Regents of the University of California.\n\ | |
37 | All rights reserved.\n"; | |
38 | #endif /* not lint */ | |
39 | ||
40 | #ifndef lint | |
41 | static char sccsid[] = "@(#)nohup.c 5.4 (Berkeley) 6/1/90"; | |
42 | #endif /* not lint */ | |
43 | ||
44 | #include <sys/param.h> | |
45 | #include <sys/signal.h> | |
46 | #include <sys/file.h> | |
47 | #include <unistd.h> | |
48 | #include <stdio.h> | |
49 | ||
50 | extern int errno; | |
51 | ||
52 | main(argc, argv) | |
53 | int argc; | |
54 | char **argv; | |
55 | { | |
56 | char *strerror(); | |
57 | ||
58 | if (argc < 2) | |
59 | usage(); | |
60 | ||
61 | if (isatty(STDOUT_FILENO)) | |
62 | dofile(); | |
63 | if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1) { | |
64 | /* may have just closed stderr */ | |
65 | (void)fprintf(stdin, "nohup: %s\n", strerror(errno)); | |
66 | exit(1); | |
67 | } | |
68 | ||
69 | (void)signal(SIGHUP, SIG_IGN); | |
70 | (void)signal(SIGQUIT, SIG_IGN); | |
71 | ||
72 | execvp(argv[1], &argv[1]); | |
73 | (void)fprintf(stderr, | |
74 | "nohup: %s: %s\n", argv[1], strerror(errno)); | |
75 | exit(1); | |
76 | } | |
77 | ||
78 | dofile() | |
79 | { | |
80 | int fd; | |
81 | char *p, path[MAXPATHLEN]; | |
82 | off_t lseek(); | |
83 | char *getenv(), *strcpy(), *strcat(), *strerror(); | |
84 | ||
85 | #define FILENAME "nohup.out" | |
86 | p = FILENAME; | |
87 | if ((fd = open(p, O_RDWR|O_CREAT, 0600)) >= 0) | |
88 | goto dupit; | |
89 | if (p = getenv("HOME")) { | |
90 | (void)strcpy(path, p); | |
91 | (void)strcat(path, "/"); | |
92 | (void)strcat(path, FILENAME); | |
93 | if ((fd = open(p = path, O_RDWR|O_CREAT, 0600)) >= 0) | |
94 | goto dupit; | |
95 | } | |
96 | (void)fprintf(stderr, "nohup: can't open a nohup.out file.\n"); | |
97 | exit(1); | |
98 | ||
99 | dupit: (void)lseek(fd, 0L, SEEK_END); | |
100 | if (dup2(fd, STDOUT_FILENO) == -1) { | |
101 | (void)fprintf(stderr, "nohup: %s\n", strerror(errno)); | |
102 | exit(1); | |
103 | } | |
104 | (void)fprintf(stderr, "sending output to %s\n", p); | |
105 | } | |
106 | ||
107 | usage() | |
108 | { | |
109 | (void)fprintf(stderr, "usage: nohup command\n"); | |
110 | exit(1); | |
111 | } |