1 files changed, 2 insertions, 0 deletions
diff --git a/src/ip.hpp b/src/ip.hpp
index ec2db43..1d44325 100644
--- a/src/ip.hpp
+++ b/src/ip.hpp
@@ -49,6 +49,8 @@
 
 namespace zmq
 {
+    //  Same as socket(2), but allows for transparent tweaking the options.
+    int open_socket (int domain_, int type_, int protocol_);
 
     //  Resolves network interface name in <nic-name>:<port> format. Symbol "*"
     //  (asterisk) resolves to INADDR_ANY (all network interfaces).