/* vi: set sw=4 ts=4: */
-/* nohup - invoke a utility immune to hangups.
- *
+/*
+ * 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>
- *
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Copyright 2006 Bernhard Reutner-Fischer
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config NOHUP
+//config: bool "nohup (2 kb)"
+//config: default y
+//config: help
+//config: run a command immune to hangups, with output to a non-tty.
-#include <fcntl.h>
-#include <signal.h>
-#include <unistd.h>
-#include "busybox.h"
+//applet:IF_NOHUP(APPLET_NOEXEC(nohup, nohup, BB_DIR_USR_BIN, BB_SUID_DROP, nohup))
-int nohup_main(int argc, char *argv[])
-{
- int temp, nullfd;
- char *nohupout = "nohup.out", *home = NULL;
+//kbuild:lib-$(CONFIG_NOHUP) += nohup.o
+
+//usage:#define nohup_trivial_usage
+//usage: "PROG ARGS"
+//usage:#define nohup_full_usage "\n\n"
+//usage: "Run PROG immune to hangups, with output to a non-tty"
+//usage:
+//usage:#define nohup_example_usage
+//usage: "$ nohup make &"
- // I have no idea why the standard cares about this.
+#include "libbb.h"
- bb_default_error_retval = 127;
+/* 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)
+#
+*/
- if (argc<2) bb_show_usage();
+int nohup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int nohup_main(int argc UNUSED_PARAM, char **argv)
+{
+ const char *nohupout;
+ char *home;
- nullfd = bb_xopen(bb_dev_null, O_WRONLY|O_APPEND);
- // If stdin is a tty, detach from it.
+ xfunc_error_retval = 127;
- if (isatty(0)) dup2(nullfd, 0);
+ if (!argv[1]) {
+ bb_show_usage();
+ }
- // Redirect stdout to nohup.out, either in "." or in "$HOME".
+ /* If stdin is a tty, detach from it. */
+ if (isatty(STDIN_FILENO)) {
+ /* bb_error_msg("ignoring input"); */
+ close(STDIN_FILENO);
+ xopen(bb_dev_null, O_RDONLY); /* will be fd 0 (STDIN_FILENO) */
+ }
- if (isatty(1)) {
- close(1);
+ nohupout = "nohup.out";
+ /* Redirect stdout to nohup.out, either in "." or in "$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) {
- home = concat_path_file(home, nohupout);
- bb_xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
+ 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 */
}
}
- } else dup2(nullfd, 1);
-
- // If we have a tty on strderr, announce filename and redirect to stdout.
- // Else redirect to /dev/null.
+ bb_error_msg("appending output to %s", nohupout);
+ }
- temp = isatty(2);
- if (temp) fdprintf(2,"Writing to %s\n", home ? home : nohupout);
- dup2(temp ? 1 : nullfd, 2);
- close(nullfd);
- signal (SIGHUP, SIG_IGN);
+ /* 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);
+ }
- // Exec our new program.
+ signal(SIGHUP, SIG_IGN);
- execvp(argv[1],argv+1);
- if (ENABLE_FEATURE_CLEAN_UP) free(home);
- bb_error_msg_and_die("exec %s",argv[1]);
+ argv++;
+ BB_EXECVP_or_die(argv);
}