[NaCl SDK] nacl_io: getsockname() should return non-zero port after bind.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3963
R=noelallen@chromium.org

Review URL: https://codereview.chromium.org/657933002

Cr-Commit-Position: refs/heads/master@{#299774}

native_client_sdk/src/libraries/nacl_io/socket/tcp_node.cc

@@ -455,6 +455,7 @@ Error TcpNode::Bind(const struct sockaddr* addr, socklen_t len) {
     return PPErrorToErrno(err);
   }
 
+  local_addr_ = TCPInterface()->GetLocalAddress(socket_resource_);
   return 0;
 }
 

native_client_sdk/src/tests/nacl_io_socket_test/socket_test.cc

@@ -679,6 +679,16 @@ TEST_F(SocketTestTCP, Listen) {
   ASSERT_EQ(0, ki_close(new_socket));
 }
 
+TEST_F(SocketTestTCP, BindAndGetSockName) {
+  sockaddr_in addr;
+  socklen_t addrlen = sizeof(addr);
+
+  // Bind
+  ASSERT_EQ(0, Bind(sock1_, LOCAL_HOST, 0));
+  EXPECT_EQ(0, ki_getsockname(sock1_, (struct sockaddr*)&addr, &addrlen));
+  EXPECT_NE(0, addr.sin_port);
+}
+
 TEST_F(SocketTestTCP, ListenNonBlocking) {
   int server_sock = sock1_;