gnutls_session_ext_register(3)     gnutls     gnutls_session_ext_register(3)

NAME         top

       gnutls_session_ext_register - API function

SYNOPSIS         top

       #include <gnutls/gnutls.h>

       int gnutls_session_ext_register(gnutls_session_t session, const char
       * name, int type, 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, unsigned flags);

ARGUMENTS         top

       gnutls_session_t session
                   the session for which this extension will be set

       const char * name
                   the name of the extension to register

       int type    the numeric id of the extension

       gnutls_ext_parse_type_t parse_type
                   the parse type of the extension (see

       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

       unsigned flags
                   must be zero or flags from gnutls_ext_flags_t

DESCRIPTION         top

       This function will register a new extension type. The extension will
       be only usable within the registered session. If the extension type
       is already registered then GNUTLS_E_ALREADY_REGISTERED will be
       returned, unless the flag GNUTLS_EXT_FLAG_OVERRIDE_INTERNAL is
       specified. The latter flag when specified can be used to override
       certain extensions introduced after 3.6.0. It is expected to be used
       by applications which handle custom extensions that are not currently
       supported in GnuTLS, but direct support for them may be added in the

       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().

RETURNS         top

       GNUTLS_E_SUCCESS on success, otherwise a negative error code.

SINCE         top


REPORTING BUGS         top

       Report bugs to <>.
       Home page:

COPYRIGHT         top

       Copyright © 2001-2018 Free Software Foundation, Inc., and others.
       Copying and distribution of this file, with or without modification,
       are permitted in any medium without royalty provided the copyright
       notice and this notice are preserved.

SEE ALSO         top

       The full documentation for gnutls is maintained as a Texinfo manual.
       If the /usr/share/doc/gnutls/ directory does not contain the HTML
       form visit 

COLOPHON         top

       This page is part of the GnuTLS (GnuTLS Transport Layer Security
       Library) project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, send it to  This page was obtained from the
       tarball gnutls-3.6.2.tar.xz fetched from
       ⟨⟩ on 2018-04-30.  If you discover
       any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
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gnutls                              3.6.2     gnutls_session_ext_register(3)