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From GitBox <...@apache.org>
Subject [GitHub] [incubator-nuttx] anchao commented on a change in pull request #1054: net/conn: generate port base dynamically
Date Fri, 15 May 2020 13:34:16 GMT

anchao commented on a change in pull request #1054:
URL: https://github.com/apache/incubator-nuttx/pull/1054#discussion_r425805217



##########
File path: net/tcp/tcp_conn.c
##########
@@ -263,6 +260,20 @@ static FAR struct tcp_conn_s *
 static int tcp_selectport(uint8_t domain, FAR const union ip_addr_u *ipaddr,
                           uint16_t portno)
 {
+  static uint16_t g_last_tcp_port;
+
+  /* Generate port base dynamically */
+
+  if (g_last_tcp_port == 0)
+    {
+      g_last_tcp_port = clock_systime_ticks() % 32000;
+
+      if (g_last_tcp_port < 4096)
+        {
+          g_last_tcp_port += 4096;
+        }
+    }
+

Review comment:
       This can not be completely avoided if the time for creating the port between the two
OS starts coincides exactly.




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