source: branches/2.2.2/mindi-busybox/coreutils/nohup.c @ 1247

Last change on this file since 1247 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 1.5 KB
Line 
1/* vi:set ts=4: */
2/* nohup - invoke a utility immune to hangups.
3 *
4 * Busybox version based on nohup specification at
5 * http://www.opengroup.org/onlinepubs/007904975/utilities/nohup.html
6 *
7 * Copyright 2006 Rob Landley <rob@landley.net>
8 *
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 */
11
12#include <fcntl.h>
13#include <signal.h>
14#include <unistd.h>
15#include "busybox.h"
16
17int nohup_main(int argc, char *argv[])
18{
19    int temp, nullfd;
20    char *nohupout = "nohup.out", *home = NULL;
21
22    // I have no idea why the standard cares about this.
23
24    bb_default_error_retval = 127;
25
26    if (argc<2) bb_show_usage();
27
28    nullfd = bb_xopen(bb_dev_null, O_WRONLY|O_APPEND);
29    // If stdin is a tty, detach from it.
30
31    if (isatty(0)) dup2(nullfd, 0);
32
33    // Redirect stdout to nohup.out, either in "." or in "$HOME".
34
35    if (isatty(1)) {
36        close(1);
37        if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
38            home = getenv("HOME");
39            if (home) {
40                home = concat_path_file(home, nohupout);
41                bb_xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
42            }
43        }
44    } else dup2(nullfd, 1);
45
46    // If we have a tty on strderr, announce filename and redirect to stdout.
47    // Else redirect to /dev/null.
48
49    temp = isatty(2);
50    if (temp) fdprintf(2,"Writing to %s\n", home ? home : nohupout);
51    dup2(temp ? 1 : nullfd, 2);
52    close(nullfd);
53    signal (SIGHUP, SIG_IGN);
54
55    // Exec our new program.
56
57    execvp(argv[1],argv+1);
58    if (ENABLE_FEATURE_CLEAN_UP) free(home);
59    bb_error_msg_and_die("exec %s",argv[1]);
60}
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