/* 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 Reutner-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]); }