@deftypefun {size_t} {gnutls_record_check_pending} (gnutls_session_t @var{session})
@var{session}: is a @code{gnutls_session_t}  type.

This function checks if there are unread data
in the gnutls buffers. If the return value is
non-zero the next call to @code{gnutls_record_recv()} 
is guaranteed not to block.

@strong{Returns:} Returns the size of the data or zero.
@end deftypefun