---
name: "gnutls_register_custom_url"
section: "3"
platform: "linux"
package: "gnutls"
version: "3.8.13-3"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/gnutls_register_custom_url"
---

# gnutls\_register\_custom\_url(3)

API function

## NAME

gnutls\_register\_custom\_url - API function

## SYNOPSIS

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

**int gnutls\_register\_custom\_url(const gnutls\_custom\_url\_st \*** *st***);**

## ARGUMENTS

- const gnutls\_custom\_url\_st \* st

  A **gnutls\_custom\_url\_st** structure

## DESCRIPTION

Register a custom URL. This will affect the following functions: **gnutls\_url\_is\_supported()**, **gnutls\_privkey\_import\_url()**, gnutls\_pubkey\_import\_url, **gnutls\_x509\_crt\_import\_url()**  and all functions that depend on them, e.g., **gnutls\_certificate\_set\_x509\_key\_file2()**.

The provided structure and callback functions must be valid throughout the lifetime of the process. The registration of an existing URL type will fail with **GNUTLS\_E\_INVALID\_REQUEST**. Since GnuTLS 3.5.0 this function can be used to override the builtin URLs.

This function is not thread safe.

## RETURNS

returns zero if the given structure was imported or a negative value otherwise.

## SINCE

3\.4.0

## REPORTING BUGS

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

## 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

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/