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