mesos socket keepalive

gistfile1.txt

$ git diff
diff --git a/3rdparty/libprocess/include/process/network.hpp b/3rdparty/libprocess/include/process/network.hpp
index 61bfa82..32c14e3 100644
--- a/3rdparty/libprocess/include/process/network.hpp
+++ b/3rdparty/libprocess/include/process/network.hpp
@@ -44,6 +44,10 @@ inline Try<int> socket(int family, int type, int protocol)
     return ErrnoError();
   }
 #endif // __APPLE__
+  const int enable = 1;
+  if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &enable, sizeof(int)) == -1) {
+    return ErrnoError();
+  }

   return s;
 }