1/* vi: set sw=4 ts=4: */ 2/* nohup - invoke a utility immune to hangups. 3 * 4 * Busybox version based on nohup specification at 5 * http://www.opengroup.org/onlinepubs/007904975/utilities/nohup.html 6 * 7 * Copyright 2006 Rob Landley <rob@landley.net> 8 * Copyright 2006 Bernhard Fischer 9 * 10 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. 11 */ 12 13#include "libbb.h" 14 15int nohup_main(int argc, char **argv); 16int nohup_main(int argc, char **argv) 17{ 18 int nullfd; 19 const char *nohupout; 20 char *home = NULL; 21 22 xfunc_error_retval = 127; 23 24 if (argc < 2) bb_show_usage(); 25 26 nullfd = xopen(bb_dev_null, O_WRONLY|O_APPEND); 27 /* If stdin is a tty, detach from it. */ 28 if (isatty(STDIN_FILENO)) 29 dup2(nullfd, STDIN_FILENO); 30 31 nohupout = "nohup.out"; 32 /* Redirect stdout to nohup.out, either in "." or in "$HOME". */ 33 if (isatty(STDOUT_FILENO)) { 34 close(STDOUT_FILENO); 35 if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) { 36 home = getenv("HOME"); 37 if (home) { 38 nohupout = concat_path_file(home, nohupout); 39 xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR); 40 } 41 } 42 } else dup2(nullfd, STDOUT_FILENO); 43 44 /* If we have a tty on stderr, announce filename and redirect to stdout. 45 * Else redirect to /dev/null. 46 */ 47 if (isatty(STDERR_FILENO)) { 48 bb_error_msg("appending to %s", nohupout); 49 dup2(STDOUT_FILENO, STDERR_FILENO); 50 } else dup2(nullfd, STDERR_FILENO); 51 52 if (nullfd > 2) 53 close(nullfd); 54 signal(SIGHUP, SIG_IGN); 55 56 BB_EXECVP(argv[1], argv+1); 57 if (ENABLE_FEATURE_CLEAN_UP && home) 58 free((char*)nohupout); 59 bb_perror_msg_and_die("%s", argv[1]); 60} 61