AIO now also supports socket transfers

include/aio.h

@@ -125,7 +125,7 @@ struct aiocb
   FAR volatile void *aio_buf;    /* Location of buffer */
   off_t aio_offset;              /* File offset */
   size_t aio_nbytes;             /* Length of transfer */
-#if CONFIG_NFILE_DESCRIPTORS > 127
+#if (CONFIG_NFILE_DESCRIPTORS + CONFIG_NSOCKET_DESCRIPTORS) > 127
   int16_t aio_fildes;            /* File descriptor (should be int) */
 #else
   int8_t aio_fildes;             /* File descriptor (should be int) */

include/nuttx/net/net.h

@@ -302,16 +302,17 @@ void net_initlist(FAR struct socketlist *list);
 void net_releaselist(FAR struct socketlist *list);
 
 /****************************************************************************
- * Name: sockfd_release
+ * Name: sockfd_socket
  *
  * Description:
- *   Free the socket by its socket descriptor.
+ *   Given a socket descriptor, return the underlying socket structure.
  *
  * Input Parameters:
- *   sockfd - Socket descriptor identifies the socket to be released.
+ *   sockfd - The socket descriptor index o use.
  *
  * Returned Value:
- *   None
+ *   On success, a reference to the socket structure associated with the
+ *   the socket descriptor is returned.  NULL is returned on any failure.
  *
  ****************************************************************************/