Networking: Start the network monitor for a socket when a TCP socket is dup'ed.

net/socket/net_clone.c

@@ -38,7 +38,6 @@
  ****************************************************************************/
 
 #include <nuttx/config.h>
-#ifdef CONFIG_NET
 
 #include <sys/socket.h>
 #include <errno.h>
@@ -48,8 +47,11 @@
 #include <nuttx/net/net.h>
 #include <nuttx/net/udp.h>
 
+#include "tcp/tcp.h"
 #include "socket/socket.h"
 
+#ifdef CONFIG_NET
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -101,6 +103,15 @@ int net_clone(FAR struct socket *psock1, FAR struct socket *psock2)
   DEBUGASSERT(psock2->s_sockif != NULL && psock2->s_sockif->si_addref != NULL);
   psock2->s_sockif->si_addref(psock2);
 
+#ifdef NET_TCP_HAVE_STACK
+  /* For connected socket types, it is necessary to also start the network monitor so
+   * that the newly cloned socket can receive a notification if the network connection
+   * is lost.
+   */
+
+  ret = tcp_start_monitor(psock2);
+#endif
+
   net_unlock();
   return ret;
 }

net/socket/socket.h

@@ -354,5 +354,24 @@ int net_timeo(systime_t start_time, socktimeo_t timeo);
 ssize_t psock_send(FAR struct socket *psock, FAR const void *buf, size_t len,
                    int flags);
 
+/****************************************************************************
+ * Name: net_clone
+ *
+ * Description:
+ *   Performs the low level, common portion of net_dupsd() and net_dupsd2()
+ *
+ * Input Parameters:
+ *   psock1 - The existing socket that is being cloned.
+ *   psock2 - A reference to an uninitialized socket structure alloated by
+ *            the caller.
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; a negated errno value is returned on
+ *   any failure.
+ *
+ ****************************************************************************/
+
+int net_clone(FAR struct socket *psock1, FAR struct socket *psock2);
+
 #endif /* CONFIG_NET */
 #endif /* _NET_SOCKET_SOCKET_H */