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 [email protected]

Author: lygstate

jerry-ext/debugger/debugger-tcp.c

@@ -144,6 +144,27 @@ 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 the debug client close the tcp connection first */
+  for (;;)
+  {
+    char buf[8];
+    jerryx_socket_ssize_t result = recv (tcp_p->tcp_socket, buf, sizeof (buf), 0);
+    if (result == 0)
+    {
+      /**
+       * If result >= 0, this means that there is either data available on the socket, or the socket
+       * has been closed. So waiting the socket closed by remote client by result == 0
+       */
+      break;
+    }
+    else if (result < 0 && jerryx_debugger_tcp_get_errno () != JERRYX_EWOULDBLOCK)
+    {
+      /* errno other than JERRYX_EWOULDBLOCK means socket have true error */
+      break;
+    }
+  }
+
   JERRYX_DEBUG_MSG ("TCP connection closed.\n");
 
   jerryx_debugger_tcp_close_socket (tcp_p->tcp_socket);