Cleaned up the code. Added client exception for error handling.

src/net/socket_msg.h

@@ -27,6 +27,10 @@
 #define ERR_SOCK_RESOLVE_FAILED			12
 #define ERR_SOCK_CONNECT_FAILED			13
 
+// This is an internal message which is not reported.
+#define MSG_SOCK_INTERNAL_PENDING		0
+
+// The following messages are reported.
 #define MSG_SOCK_INIT_DONE				1
 #define MSG_SOCK_RESOLVE_DONE			2
 #define MSG_SOCK_CONNECT_DONE			3