/* 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>
- * Copyright 2006 Bernhard Fischer
+ * Copyright 2006 Bernhard Reutner-Fischer
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * 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 "busybox.h"
+//applet:IF_NOHUP(APPLET_NOEXEC(nohup, nohup, BB_DIR_USR_BIN, BB_SUID_DROP, nohup))
-int nohup_main(int argc, char **argv)
+//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 &"
+
+#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 UNUSED_PARAM, char **argv)
{
- int nullfd;
const char *nohupout;
- char *home = NULL;
+ char *home;
xfunc_error_retval = 127;
- if (argc < 2) bb_show_usage();
+ if (!argv[1]) {
+ 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);
+ 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 (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 */
}
}
- } else dup2(nullfd, STDOUT_FILENO);
+ bb_error_msg("appending output to %s", nohupout);
+ }
- /* If we have a tty on stderr, announce filename and redirect to stdout.
- * Else redirect to /dev/null.
- */
+ /* If we have a tty on stderr, redirect to stdout. */
if (isatty(STDERR_FILENO)) {
- bb_error_msg("appending to %s", nohupout);
+ /* if (stdout_wasnt_a_tty)
+ bb_error_msg("redirecting stderr to stdout"); */
dup2(STDOUT_FILENO, STDERR_FILENO);
- } else dup2(nullfd, STDERR_FILENO);
+ }
- if (nullfd > 2)
- close(nullfd);
signal(SIGHUP, SIG_IGN);
- execvp(argv[1], argv+1);
- if (ENABLE_FEATURE_CLEAN_UP && home)
- free((char*)nohupout);
- bb_perror_msg_and_die("%s", argv[1]);
+ argv++;
+ BB_EXECVP_or_die(argv);
}