Function t30_set_document_handler 

pub unsafe extern "C" fn t30_set_document_handler(
    s: *mut t30_state_t,
    handler: t30_document_handler_t,
    user_data: *mut c_void,
)

Set a callback function for T.30 end of document handling. \brief Set a callback function for T.30 end of document handling. \param s The T.30 context. \param handler The callback function. \param user_data An opaque pointer passed to the callback function.