Networking: Separate TCP poll logic out of net/sockets/net_poll.c and move it into the new net/tcp/tcp_netpoll.c.

net/tcp/tcp.h

@@ -275,6 +275,7 @@ extern "C"
 
 struct sockaddr;  /* Forward reference */
 struct socket;    /* Forward reference */
+struct pollfd;    /* Forward reference */
 
 /****************************************************************************
  * Name: tcp_initialize
@@ -1063,6 +1064,46 @@ void tcp_wrbuffer_dump(FAR const char *msg, FAR struct tcp_wrbuffer_s *wrb,
 #endif
 #endif /* CONFIG_NET_TCP_WRITE_BUFFERS */
 
+/****************************************************************************
+ * Function: tcp_pollsetup
+ *
+ * Description:
+ *   Setup to monitor events on one TCP/IP socket
+ *
+ * Input Parameters:
+ *   psock - The TCP/IP socket of interest
+ *   fds   - The structure describing the events to be monitored, OR NULL if
+ *           this is a request to stop monitoring events.
+ *
+ * Returned Value:
+ *  0: Success; Negated errno on failure
+ *
+ ****************************************************************************/
+
+#ifdef HAVE_TCP_POLL
+int tcp_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds);
+#endif
+
+/****************************************************************************
+ * Function: tcp_pollteardown
+ *
+ * Description:
+ *   Teardown monitoring of events on an TCP/IP socket
+ *
+ * Input Parameters:
+ *   psock - The TCP/IP socket of interest
+ *   fds   - The structure describing the events to be monitored, OR NULL if
+ *           this is a request to stop monitoring events.
+ *
+ * Returned Value:
+ *  0: Success; Negated errno on failure
+ *
+ ****************************************************************************/
+
+#ifdef HAVE_TCP_POLL
+int tcp_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds);
+#endif
+
 #undef EXTERN
 #ifdef __cplusplus
 }