---
name: "gnutls_certificate_server_set_retrieve_function"
section: "3"
platform: "linux"
package: "gnutls-doc"
version: "3.3.8-6+deb8u7"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/gnutls_certificate_server_set_retrieve_function"
---

# gnutls\_certificate\_server\_set\_retrieve\_function(3)

API function

## NAME

gnutls\_certificate\_server\_set\_retrieve\_function - API function

## SYNOPSIS

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

**void gnutls\_certificate\_server\_set\_retrieve\_function(gnutls\_certificate\_credentials\_t** *cred***, gnutls\_certificate\_server\_retrieve\_function \*** *func***);**

## ARGUMENTS

- gnutls\_certificate\_credentials\_t cred

  is a **gnutls\_certificate\_credentials\_t** structure.

- gnutls\_certificate\_server\_retrieve\_function \* func

  is the callback function

## DESCRIPTION

This function sets a callback to be called in order to retrieve the certificate to be used in the handshake. You are advised to use **gnutls\_certificate\_set\_retrieve\_function2()** because it is much more efficient in the processing it requires from gnutls.

The callback's function prototype is: int (\*callback)(gnutls\_session\_t, gnutls\_retr\_st\* st);

 *st* should contain the certificates and private keys.

If the callback function is provided then gnutls will call it, in the handshake, after the certificate request message has been received.

The callback function should set the certificate list to be sent, and return 0 on success.  The value (-1) indicates error and the handshake will be terminated.

## REPORTING BUGS

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

## COPYRIGHT

Copyright © 2001-2014 Free Software Foundation, Inc..\
 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

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

- http://www.gnutls.org/manual/