---
name: "gnutls_x509_trust_list_add_trust_file"
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_trust_list_add_trust_file"
---

# gnutls\_x509\_trust\_list\_add\_trust\_file(3)

API function

## NAME

gnutls\_x509\_trust\_list\_add\_trust\_file - API function

## SYNOPSIS

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

**int gnutls\_x509\_trust\_list\_add\_trust\_file(gnutls\_x509\_trust\_list\_t** *list***, const char \*** *ca\_file***, const char \*** *crl\_file***, gnutls\_x509\_crt\_fmt\_t** *type***, unsigned int** *tl\_flags***, unsigned int** *tl\_vflags***);**

## ARGUMENTS

- gnutls\_x509\_trust\_list\_t list

  The list

- const char \* ca\_file

  A file containing a list of CAs (optional)

- const char \* crl\_file

  A file containing a list of CRLs (optional)

- gnutls\_x509\_crt\_fmt\_t type

  The format of the certificates

- unsigned int tl\_flags

  flags from **gnutls\_trust\_list\_flags\_t**

- unsigned int tl\_vflags

  gnutls\_certificate\_verify\_flags if flags specifies GNUTLS\_TL\_VERIFY\_CRL

## DESCRIPTION

This function will add the given certificate authorities to the trusted list. PKCS **11** URLs are also accepted, instead of files, by this function. A PKCS **11** URL implies a trust database (a specially marked module in p11-kit); the URL "pkcs11:" implies all trust databases in the system. Only a single URL specifying trust databases can be set; they cannot be stacked with multiple calls.

## RETURNS

The number of added elements is returned.

## SINCE

3\.1

## 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/