/* 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" int nohup_main(int argc, char **argv); int nohup_main(int argc, char **argv) { int nullfd; const char *nohupout; char *home = NULL; xfunc_error_retval = 127; if (argc < 2) bb_show_usage(); nullfd = xopen(bb_dev_null, O_WRONLY|O_APPEND); /* If stdin is a tty, detach from it. */ if (isatty(STDIN_FILENO)) dup2(nullfd, 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 dup2(nullfd, STDOUT_FILENO); /* If we have a tty on stderr, announce filename and redirect to stdout. * Else redirect to /dev/null. */ if (isatty(STDERR_FILENO)) { bb_error_msg("appending to %s", nohupout); dup2(STDOUT_FILENO, STDERR_FILENO); } else dup2(nullfd, STDERR_FILENO); if (nullfd > 2) close(nullfd); signal(SIGHUP, SIG_IGN); BB_EXECVP(argv[1], argv+1); if (ENABLE_FEATURE_CLEAN_UP && home) free((char*)nohupout); bb_perror_msg_and_die("%s", argv[1]); }