| /* vi: set sw=4 ts=4: */ |
| /* nohup - invoke a utility immune to hangups. |
| * |
| * Busybox version based on nohup specification at |
| * http://www.opengroup.org/onlinepubs/007904975/utilities/nohup.html |
| * |
| * Copyright 2006 Rob Landley <rob@landley.net> |
| * Copyright 2006 Bernhard Fischer |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| */ |
| |
| #include "libbb.h" |
| |
| /* Compat info: nohup (GNU coreutils 6.8) does this: |
| # nohup true |
| nohup: ignoring input and appending output to `nohup.out' |
| # nohup true 1>/dev/null |
| nohup: ignoring input and redirecting stderr to stdout |
| # nohup true 2>zz |
| # cat zz |
| nohup: ignoring input and appending output to `nohup.out' |
| # nohup true 2>zz 1>/dev/null |
| # cat zz |
| nohup: ignoring input |
| # nohup true </dev/null 1>/dev/null |
| nohup: redirecting stderr to stdout |
| # nohup true </dev/null 2>zz 1>/dev/null |
| # cat zz |
| (nothing) |
| # |
| */ |
| |
| int nohup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int nohup_main(int argc, char **argv) |
| { |
| const char *nohupout; |
| char *home; |
| |
| xfunc_error_retval = 127; |
| |
| if (argc < 2) bb_show_usage(); |
| |
| /* If stdin is a tty, detach from it. */ |
| if (isatty(STDIN_FILENO)) { |
| /* bb_error_msg("ignoring input"); */ |
| close(STDIN_FILENO); |
| xopen(bb_dev_null, O_RDONLY); /* will be fd 0 (STDIN_FILENO) */ |
| } |
| |
| nohupout = "nohup.out"; |
| /* Redirect stdout to nohup.out, either in "." or in "$HOME". */ |
| if (isatty(STDOUT_FILENO)) { |
| close(STDOUT_FILENO); |
| if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) { |
| home = getenv("HOME"); |
| if (home) { |
| nohupout = concat_path_file(home, nohupout); |
| xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR); |
| } else { |
| xopen(bb_dev_null, O_RDONLY); /* will be fd 1 */ |
| } |
| } |
| bb_error_msg("appending output to %s", nohupout); |
| } |
| |
| /* If we have a tty on stderr, redirect to stdout. */ |
| if (isatty(STDERR_FILENO)) { |
| /* if (stdout_wasnt_a_tty) |
| bb_error_msg("redirecting stderr to stdout"); */ |
| dup2(STDOUT_FILENO, STDERR_FILENO); |
| } |
| |
| signal(SIGHUP, SIG_IGN); |
| |
| BB_EXECVP(argv[1], argv+1); |
| bb_simple_perror_msg_and_die(argv[1]); |
| } |