



@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
