---
name: "gnutls_x509_ext_export_basic_constraints"
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_x509_ext_export_basic_constraints"
---

# gnutls\_x509\_ext\_export\_basic\_constraints(3)

API function

## NAME

gnutls\_x509\_ext\_export\_basic\_constraints - API function

## SYNOPSIS

**#include \<gnutls/x509-ext.h\>**

**int gnutls\_x509\_ext\_export\_basic\_constraints(unsigned int** *ca***, int** *pathlen***, gnutls\_datum\_t \*** *ext***);**

## ARGUMENTS

- unsigned int ca

  non-zero for a CA

- int pathlen

  The path length constraint (set to -1 for no constraint)

- gnutls\_datum\_t \* ext

  The DER-encoded extension data; must be freed using **gnutls\_free()**.

## DESCRIPTION

This function will convert the parameters provided to a basic constraints DER encoded extension (2.5.29.19). The  *ext* data will be allocated using **gnutls\_malloc()**.

## RETURNS

On success, **GNUTLS\_E\_SUCCESS** (0) is returned, otherwise a negative error value.

## SINCE

3\.3.0

## 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/