@deftypefun {ssize_t} {gnutls_record_send_early_data} (gnutls_session_t @var{session}, const void * @var{data}, size_t @var{data_size})
@var{session}: is a @code{gnutls_session_t} type.
@var{data}: contains the data to send
@var{data_size}: is the length of the data
This function can be used by a client to send data early in the
handshake processes when resuming a session. This is used to
implement a zero-roundtrip (0-RTT) mode. It has the same semantics
as @code{gnutls_record_send()} .
There may be a limit to the amount of data sent as early data. Use
@code{gnutls_record_get_max_early_data_size()} to check the limit. If the
limit exceeds, this function returns
@code{GNUTLS_E_RECORD_LIMIT_REACHED} .
@strong{Returns:} The number of bytes sent, or a negative error code. The
number of bytes sent might be less than @code{data_size} . The maximum
number of bytes this function can send in a single call depends
on the negotiated maximum record size.
@strong{Since:} 3.6.5
@end deftypefun