From 4c6df516ae76a366f0ba34be8a50cbef62d83812 Mon Sep 17 00:00:00 2001
From: Vishnu Kannan <vishnuk@google.com>
Date: Wed, 19 Nov 2014 20:14:20 +0000
Subject: [PATCH] Set child sub reaper option on nsenter to help cleanup all
 processes orphaned via ExecIn.

Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)
---
 namespaces/nsenter/nsenter.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/namespaces/nsenter/nsenter.c b/namespaces/nsenter/nsenter.c
index 2869dd14..f060f63b 100644
--- a/namespaces/nsenter/nsenter.c
+++ b/namespaces/nsenter/nsenter.c
@@ -10,6 +10,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/prctl.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <getopt.h>
@@ -88,6 +89,11 @@ void nsenter()
 		return;
 	}
 
+	if (prctl(PR_SET_CHILD_SUBREAPER, 1, 0, 0, 0) == -1) {
+                fprintf(stderr, "nsenter: failed to set child subreaper: %s", strerror(errno));
+                exit(1);
+        }
+
 	static const struct option longopts[] = {
 		{"nspid", required_argument, NULL, 'n'},
 		{"console", required_argument, NULL, 't'},