From 24e634c970ceec6a1ef5d8f7e5013d1e42a61fb6 Mon Sep 17 00:00:00 2001
From: Jose <jose@zeroc.com>
Date: Tue, 30 Jul 2013 23:28:02 +0200
Subject: ICE-5330 - reset "/dev/urandom" state at fork.

---
 cpp/src/IceUtil/Random.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'cpp/src/IceUtil/Random.cpp')

diff --git a/cpp/src/IceUtil/Random.cpp b/cpp/src/IceUtil/Random.cpp
index 5da54df01e7..8bd61f41270 100644
--- a/cpp/src/IceUtil/Random.cpp
+++ b/cpp/src/IceUtil/Random.cpp
@@ -47,6 +47,18 @@ Mutex* staticMutex = 0;
 HCRYPTPROV context = 0;
 #else
 int fd = -1;
+//
+// Callback to use with pthread_atfork to reset the "/dev/urandom"  
+// fd state. We don't need to close the fd here as that is done 
+// during static destruction.
+//
+void childAtFork()
+{
+    if(fd != -1)
+    {
+        fd = -1;
+    }
+}
 #endif
 
 class Init
@@ -56,6 +68,13 @@ public:
     Init()
     {
         staticMutex = new IceUtil::Mutex;
+#ifndef _WIN32
+        //
+        // Register a callback to reset the "/dev/urandom" fd 
+        // state after fork.
+        //
+        pthread_atfork(0, 0, &childAtFork);
+#endif
     }
     
     ~Init()
-- 
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