Waiting the tcp socket closed by remote client

So that the tcp socket are closed by debugger client first and
the debugger client won't receive socket are closed by remote error

JerryScript-DCO-1.0-Signed-off-by: Yonggang Luo luoyonggang@gmail.com

jerry-ext/debugger/debugger-tcp.c

@@ -146,6 +146,30 @@ jerryx_debugger_tcp_close (jerry_debugger_transport_header_t *header_p) /**< tcp
 
   jerryx_debugger_transport_tcp_t *tcp_p = (jerryx_debugger_transport_tcp_t *) header_p;
 
+  /* Waiting for the debug client close the tcp connection first. */
+  while (true)
+  {
+    char buf[8];
+    jerryx_socket_ssize_t result = recv (tcp_p->tcp_socket, buf, sizeof (buf), 0);
+    if (result == 0)
+    {
+      /**
+       * If result == 0, means the socket are closed by remote client, break the loop
+       */
+      break;
+    }
+    else if (result < 0 && jerryx_debugger_tcp_get_errno () != JERRYX_EWOULDBLOCK)
+    {
+      /* errno other than JERRYX_EWOULDBLOCK means socket have true error, break the loop */
+      break;
+    }
+    /**
+     * If result > 0, means that there is data available on the socket, waiting.
+     * If result < 0 and errno == JERRYX_EWOULDBLOCK, means have no data but
+     * the socket still available, waiting.
+     */
+  }
+
   JERRYX_DEBUG_MSG ("TCP connection closed.\n");
 
   jerryx_debugger_tcp_close_socket (tcp_p->tcp_socket);