From 4240364098e0a2aa4edcd854de68373f5b6aa659 Mon Sep 17 00:00:00 2001
From: Paul Fox
Date: Mon, 1 Aug 2005 22:52:09 +0000
Subject: commiting:     0000028 03-16-05 patch: new setsid applet

---
 include/applets.h     |  3 +++
 include/usage.h       |  6 ++++++
 miscutils/Config.in   |  6 ++++++
 miscutils/Makefile.in |  1 +
 miscutils/setsid.c    | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 62 insertions(+)
 create mode 100644 miscutils/setsid.c

diff --git a/include/applets.h b/include/applets.h
index d6aee55..e2fe251 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -558,6 +558,9 @@
 #ifdef CONFIG_SETKEYCODES
 	APPLET(setkeycodes, setkeycodes_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
 #endif
+#ifdef CONFIG_SETSID
+	APPLET(setsid, setsid_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
+#endif
 #if defined(CONFIG_FEATURE_SH_IS_ASH) && defined(CONFIG_ASH)
 	APPLET_NOUSAGE("sh", ash_main, _BB_DIR_BIN, _BB_SUID_NEVER)
 #elif defined(CONFIG_FEATURE_SH_IS_HUSH) && defined(CONFIG_HUSH)
diff --git a/include/usage.h b/include/usage.h
index 5d7c365..dc8058a 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -2375,6 +2375,12 @@
 #define setkeycodes_example_usage \
 	"$ setkeycodes e030 127\n"
 
+#define setsid_trivial_usage \
+	"program [arg ...]"
+#define setsid_full_usage \
+	"Runs any program in a new session by calling setsid() before\n" \
+	"exec'ing the rest of its arguments.  See setsid(2) for details."
+
 #define lash_trivial_usage \
 	"[FILE]...\n" \
 	"or: sh -c command [args]..."
diff --git a/miscutils/Config.in b/miscutils/Config.in
index 69a3300..6c68cd0 100644
--- a/miscutils/Config.in
+++ b/miscutils/Config.in
@@ -215,6 +215,12 @@ config CONFIG_STRINGS
 	  strings prints the printable character sequences for each file
 	  specified.
 
+config CONFIG_SETSID
+	bool "setsid"
+	default n
+	help
+	  setsid runs a program in a new session
+
 config CONFIG_TIME
 	bool "time"
 	default n
diff --git a/miscutils/Makefile.in b/miscutils/Makefile.in
index d4c5ff7..8c53104 100644
--- a/miscutils/Makefile.in
+++ b/miscutils/Makefile.in
@@ -36,6 +36,7 @@ MISCUTILS-$(CONFIG_LAST)        += last.o
 MISCUTILS-$(CONFIG_MAKEDEVS)    += makedevs.o
 MISCUTILS-$(CONFIG_MT)          += mt.o
 MISCUTILS-$(CONFIG_RX)          += rx.o
+MISCUTILS-$(CONFIG_SETSID)      += setsid.o
 MISCUTILS-$(CONFIG_STRINGS)     += strings.o
 MISCUTILS-$(CONFIG_TIME)        += time.o
 MISCUTILS-$(CONFIG_WATCHDOG)    += watchdog.o
diff --git a/miscutils/setsid.c b/miscutils/setsid.c
new file mode 100644
index 0000000..7df35be
--- /dev/null
+++ b/miscutils/setsid.c
@@ -0,0 +1,46 @@
+/*
+ * setsid.c -- execute a command in a new session
+ * Rick Sladkey <jrs@world.std.com>
+ * In the public domain.
+ *
+ * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
+ * - added Native Language Support
+ *
+ * 2001-01-18 John Fremlin <vii@penguinpowered.com>
+ * - fork in case we are process group leader
+ *
+ * 2004-11-12 Paul Fox
+ * - busyboxed
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include "busybox.h"
+
+int
+setsid_main(int argc, char *argv[]) {
+	
+	if (argc < 2) {
+		bb_show_usage();
+	}
+
+	if (getpgrp() == getpid()) {
+		switch(fork()){
+		case -1:
+			bb_perror_msg_and_die("fork");
+		case 0:
+			break;
+		default:	/* parent */
+			exit(0);
+		}
+		/* child falls through */
+	}
+
+	setsid();  /* no error possible */
+
+	execvp(argv[1], argv + 1);
+
+	bb_perror_msg_and_die(argv[1]);
+
+}
-- 
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