Document recvfrom() bug

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4399 7fd9a85b-ad96-42d3-883c-3090e2eb8679

nuttx/TODO

@@ -13,7 +13,7 @@ nuttx/
   (1)  pthreads (sched/)
   (2)  C++ Support
   (5)  Binary loaders (binfmt/)
- (17)  Network (net/, drivers/net)
+ (18)  Network (net/, drivers/net)
   (2)  USB (drivers/usbdev, drivers/usbhost)
   (8)  Libraries (lib/)
  (10)  File system/Generic drivers (fs/, drivers/)
@@ -437,6 +437,18 @@ o Network (net/, drivers/net)
   Status:      Open
   Priority:    Low unless you need it.
 
+  Title:       RECV/RECVFROM RETURN VALUE
+  Description: If the peer performs an orderly shutdown, then recvfrom currently returns
+               an error with errno set to ENOTCONN.  This is wrong.  There is a fine
+               distinction.  The ENOTCONN errno is intended for the case where the socket
+               was never connected.  In the case were the socket was connected then the
+               peer performs an order shutdown:  "...If no messages are available to be
+               received and the peer has performed an orderly shutdown, recv() shall
+               return 0. ..."
+  Status:      Open and there is a kludge in apps/netutils/ftpd/ftpdc.c work around this
+               bad return value.
+  Priority:    Medium
+
 o USB (drivers/usbdev, drivers/usbhost)
   ^^^^^^^^^^^^^^^^^^^^