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       gnutls_ext_register - API function


       #include <gnutls/gnutls.h>

       int  gnutls_ext_register(const  char  *  name, int id, gnutls_ext_parse_type_t parse_type,
       gnutls_ext_recv_func          recv_func,          gnutls_ext_send_func          send_func,
       gnutls_ext_deinit_data_func       deinit_func,       gnutls_ext_pack_func       pack_func,
       gnutls_ext_unpack_func unpack_func);


       const char * name
                   the name of the extension to register

       int id      the numeric TLS id of the extension

       gnutls_ext_parse_type_t parse_type
                   the parse type of the extension (see gnutls_ext_parse_type_t)

       gnutls_ext_recv_func recv_func
                   a function to receive the data

       gnutls_ext_send_func send_func
                   a function to send the data

       gnutls_ext_deinit_data_func deinit_func
                   a function deinitialize any private data

       gnutls_ext_pack_func pack_func
                   a function which serializes the extension's  private  data  (used  on  session
                   packing for resumption)

       gnutls_ext_unpack_func unpack_func
                   a function which will deserialize the extension's private data


       This  function  will  register  a new extension type. The extension will remain registered
       until gnutls_global_deinit() is called. If the extension type is already  registered  then
       GNUTLS_E_ALREADY_REGISTERED will be returned.

       Each  registered  extension  can  store temporary data into the gnutls_session_t structure
       using gnutls_ext_set_data(), and they can be retrieved using gnutls_ext_get_data().

       Any extensions registered with this function are valid for the client  and  TLS1.2  server
       hello (or encrypted extensions for TLS1.3).

       This function is not thread safe.


       GNUTLS_E_SUCCESS on success, otherwise a negative error code.




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