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@deftypefun {int} {gnutls_ext_get_data} (gnutls_session_t @var{session}, unsigned @var{tls_id}, gnutls_ext_priv_data_t * @var{data})
@var{session}: a @code{gnutls_session_t} opaque pointer
@var{tls_id}: the numeric id of the extension
@var{data}: a pointer to the private data to retrieve
This function retrieves any data previously stored with @code{gnutls_ext_set_data()} .
@strong{Returns:} @code{GNUTLS_E_SUCCESS} on success, otherwise a negative error code.
@strong{Since:} 3.4.0
@end deftypefun
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