Add support for TCP/IP connection backlog

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1294 42af7a65-404d-4744-a932-0658087f49c3

examples/README.txt

@@ -118,6 +118,11 @@ examples/poll
   CONFIG_EXAMPLE_POLL_DRIPADDR      - Default router IP addess
   CONFIG_EXAMPLE_POLL_NETMASK       - Network mask
 
+  In order to for select to work with incoming connections, you
+  must also select:
+
+  CONFIG_NET_TCPBACKLOG             - Incoming connections pend in a backlog until accept() is called.
+
   In additional to the target device-side example, there is also
   a host-side application in this directory.  It can be compiled under
   Linux or Cygwin as follows:

examples/poll/Makefile

@@ -70,6 +70,6 @@ clean:
 	$(call CLEAN)
 
 distclean: clean
-	@rm -f Make.dep .depend
+	@rm -f Make.dep .depend host
 
 -include Make.dep

examples/poll/poll_main.c

@@ -156,7 +156,7 @@ int user_start(int argc, char *argv[])
     }
 
 #ifdef HAVE_NETPOLL
-#if 0 /* select doesn't work for connections yet */
+#ifdef CONFIG_NET_TCPBACKLOG
   message("user_start: Starting net_listener thread\n");
 
   ret = pthread_create(&tid3, NULL, net_listener, NULL);