@deftypefun {int} {gnutls_psk_server_get_username2} (gnutls_session_t @var{session}, gnutls_datum_t * @var{username})
@var{session}: is a gnutls session

@var{username}: a datum that will be filled in by this function

Return a pointer to the username of the peer in the supplied datum. Does not
need to be null-terminated.

This should only be called in case of PSK authentication and in
case of a server.

The returned pointer should be considered constant (do not free) and valid 
for the lifetime of the session.

@strong{Returns:} @code{GNUTLS_E_SUCCESS} , or a negative value in case of an error.
@end deftypefun