5 files changed, 62 insertions, 0 deletions

diff --git a/include/applets.h b/include/applets.h
index d6aee5599..e2fe25167 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 5d7c36551..dc8058a20 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 69a330058..6c68cd08e 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 d4c5ff76b..8c53104ed 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 000000000..7df35be3b
--- /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]);
+
+}