gnutls_init(3) — Linux manual page


gnutls_init(3)                   gnutls                   gnutls_init(3)

NAME         top

       gnutls_init - API function

SYNOPSIS         top

       #include <gnutls/gnutls.h>

       int gnutls_init(gnutls_session_t * session, unsigned int flags);

ARGUMENTS         top

       gnutls_session_t * session
                   is a pointer to a gnutls_session_t type.

       unsigned int flags
                   indicate if this session is to be used for server or

DESCRIPTION         top

       This function initializes the provided session. Every session
       must be initialized before use, and after successful
       initialization and use must be deinitialized by calling

        flags can be any combination of flags from gnutls_init_flags_t.

       Note that since version 3.1.2 this function enables some common
       TLS extensions such as session tickets and OCSP certificate
       status request in client side by default. To prevent that use the

       Note that it is never mandatory to use gnutls_deinit() after this
       function fails.  Since gnutls 3.8.0, it is safe to
       unconditionally use gnutls_deinit() even after failure regardless
       of whether the memory was initialized prior to gnutls_init();
       however, clients wanting to be portable to older versions of the
       library should either skip deinitialization on failure, or
       pre-initialize the memory passed in to gnutls_init() to all
       zeroes via memset() or similar.

RETURNS         top

       GNUTLS_E_SUCCESS on success, or an error code.

REPORTING BUGS         top

       Report bugs to <>.
       Home page:

COPYRIGHT         top

       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         top

       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

COLOPHON         top

       This page is part of the GnuTLS (GnuTLS Transport Layer Security
       Library) project.  Information about the project can be found at
       ⟨⟩.  If you have a bug report for this
       manual page, send it to  This page was obtained
       from the tarball gnutls-3.8.2.tar.xz fetched from
       ⟨⟩ on 2023-12-22.  If you
       discover any rendering problems in this HTML version of the page,
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       manual page), send a mail to

gnutls                            3.8.2                   gnutls_init(3)