| 1 | /* vi: set sw=4 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 | * Copyright 2006 Bernhard Fischer
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| 9 | *
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| 10 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 11 | */
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| 12 |
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| 13 | #include "libbb.h"
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| 14 |
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| 15 | int nohup_main(int argc, char **argv);
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| 16 | int nohup_main(int argc, char **argv)
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| 17 | {
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| 18 | int nullfd;
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| 19 | const char *nohupout;
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| 20 | char *home = NULL;
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| 21 |
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| 22 | xfunc_error_retval = 127;
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| 23 |
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| 24 | if (argc < 2) bb_show_usage();
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| 25 |
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| 26 | nullfd = xopen(bb_dev_null, O_WRONLY|O_APPEND);
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| 27 | /* If stdin is a tty, detach from it. */
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| 28 | if (isatty(STDIN_FILENO))
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| 29 | dup2(nullfd, STDIN_FILENO);
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| 30 |
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| 31 | nohupout = "nohup.out";
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| 32 | /* Redirect stdout to nohup.out, either in "." or in "$HOME". */
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| 33 | if (isatty(STDOUT_FILENO)) {
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| 34 | close(STDOUT_FILENO);
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| 35 | if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
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| 36 | home = getenv("HOME");
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| 37 | if (home) {
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| 38 | nohupout = concat_path_file(home, nohupout);
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| 39 | xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
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| 40 | }
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| 41 | }
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| 42 | } else dup2(nullfd, STDOUT_FILENO);
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| 43 |
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| 44 | /* If we have a tty on stderr, announce filename and redirect to stdout.
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| 45 | * Else redirect to /dev/null.
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| 46 | */
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| 47 | if (isatty(STDERR_FILENO)) {
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| 48 | bb_error_msg("appending to %s", nohupout);
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| 49 | dup2(STDOUT_FILENO, STDERR_FILENO);
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| 50 | } else dup2(nullfd, STDERR_FILENO);
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| 51 |
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| 52 | if (nullfd > 2)
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| 53 | close(nullfd);
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| 54 | signal(SIGHUP, SIG_IGN);
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| 55 |
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| 56 | BB_EXECVP(argv[1], argv+1);
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| 57 | if (ENABLE_FEATURE_CLEAN_UP && home)
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| 58 | free((char*)nohupout);
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| 59 | bb_perror_msg_and_die("%s", argv[1]);
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| 60 | }
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