gnutls\_supplemental\_register(3) gnutls gnutls\_supplemental\_register(3)

# [NAME](#NAME)

gnutls\_supplemental\_register - API function

# [SYNOPSIS](#SYNOPSIS)

**#include <gnutls/gnutls.h>**

**int gnutls\_supplemental\_register(const char * name, gnutls\_supplemental\_data\_format\_type\_t type, gnutls\_supp\_recv\_func recv\_func, gnutls\_supp\_send\_func send\_func);**

# [ARGUMENTS](#ARGUMENTS)

[const char * name](#const)

the name of the supplemental data to register

[gnutls\_supplemental\_data\_format\_type\_t type](#gnutls_supplemental_data_format_type_t)

the type of the supplemental data format

[gnutls\_supp\_recv\_func recv\_func](#gnutls_supp_recv_func)

the function to receive the data

[gnutls\_supp\_send\_func send\_func](#gnutls_supp_send_func)

the function to send the data

# [DESCRIPTION](#DESCRIPTION)

This function will register a new supplemental data type (rfc4680). The registered data will remain until **gnutls\_global\_deinit()** is called. The provided *type* must be an unassigned type in **gnutls\_supplemental\_data\_format\_type\_t**. If the type is already registered or handled by GnuTLS internally **GNUTLS\_E\_ALREADY\_REGISTERED** will be returned.

This function is not thread safe. As supplemental data are not defined under TLS 1.3, this function will disable TLS 1.3 support globally.

# [RETURNS](#RETURNS)

**GNUTLS\_E\_SUCCESS** on success, otherwise a negative error code.

# [SINCE](#SINCE)

3.4.0

# [REPORTING BUGS](#REPORTING_BUGS)

Report bugs to <bugs@gnutls.org>.  
Home page: https://www.gnutls.org

# [COPYRIGHT](#COPYRIGHT)

Copyright © 2001-2023 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](#SEE_ALSO)

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

[https://www.gnutls.org/manual/](https://www.gnutls.org/manual/)

3.8.13 gnutls

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Document: gnutls_supplemental_register(3) from gnutls 3.8.13-r3 (Chainguard OS)
Source: https://gitlab.com/gnutls/gnutls