nbd_set_tls_priority(3)

📦
version 1.24.4 · 9 versions
, in arch rolling

NAME 🌸

nbd_set_tls_priority(3) from the LIBNBD manual — set the TLS priority string ✨

SYNOPSIS 🎀

#include <libnbd.h>

int nbd_set_tls_priority (
      struct nbd_handle *h, const char *priority
    );

DESCRIPTION 💅

Okay bestie, so this function sets the TLS priority string. That string is the main-character energy for TLS: it controls which ciphers, key exchange methods and MACs are used, and in what order 🔥.

For the full lore, see "Priority strings" in the GnuTLS manual.

The default is picked at compile time, either using ./configure --with-tls-priority=PRIORITY, or — if that wasn’t set — then NORMAL.

Not recommended to change this unless you know what you are doing. Like, fr fr.

⚠️ It may be dangerous to set this from an untrusted source, since it may allow you to read some local configuration files, and possibly downgrade TLS security. 💀

This function may be called regardless of whether TLS is supported, but will have no effect unless nbd_set_tls(3) is also used to request or require TLS.

RETURN VALUE 🫶

If the call is successful the function returns 0 ✨

ERRORS 😭

On error -1 is returned.

Refer to "ERROR HANDLING" in libnbd(3) for how to get further details of the error.

The following parameters must not be NULL: h, priority. For more information see "Non-NULL parameters" in libnbd(3).

HANDLE STATE 👑

nbd_set_tls_priority can be called when the handle is in the following state:

  • Handle created, before connecting — ✅ allowed
  • Connecting — ❌ error
  • Connecting & handshaking (opt_mode) — ❌ error
  • Connected to the server — ❌ error
  • Connection shut down — ❌ error
  • Handle dead — ❌ error

VERSION 🦋

This function first appeared in libnbd 1.24.

If you need to test if this function is available at compile time check if the following macro is defined:

#define LIBNBD_HAVE_NBD_SET_TLS_PRIORITY 1

SEE ALSO 🌈

AUTHORS 💖

  • Eric Blake
  • Richard W.M. Jones

Copyright Red Hat

LICENSE 🧚

Legal text, verbatim because rules are rules:

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

That’s the whole page, bestie — libnbd-1.24.4, dated 2026-10-13, and yes the footer says nbd_set_tls_priority(3) 💅✨

📦 where this page comes from