---
name: "nbd_supports_vsock"
section: "3"
platform: "linux"
package: "libnbd"
version: "1.24.4-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/nbd_supports_vsock"
---

# nbd\_supports\_vsock(3)

true if libnbd was compiled with support for AF\_VSOCK

## NAME

nbd\_supports\_vsock - true if libnbd was compiled with support for AF\_VSOCK

## SYNOPSIS

```
 #include <libnbd.h>
 int nbd_supports_vsock (
       struct nbd_handle *h
     );
```

## DESCRIPTION

Returns true if libnbd was compiled with support for the `"AF_VSOCK"` family of sockets, or false if not.

Note that on the Linux operating system, this returns true if there is compile-time support, but you may still need runtime support for some aspects of AF\_VSOCK usage; for example, use of `"VMADDR_CID_LOCAL"` as the server name requires that the *vsock\_loopback* kernel module is loaded.

## RETURN VALUE

This call returns a boolean value.

## ERRORS

This function does not fail.

The following parameters must not be NULL: `"h"`. For more information see "Non-NULL parameters" in [**libnbd**(3)](/libnbd/3.md).

## VERSION

This function first appeared in libnbd 1.16.

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

```
 #define LIBNBD_HAVE_NBD_SUPPORTS_VSOCK 1
```

## SEE ALSO

[**nbd\_connect\_uri**(3)](/nbd_connect_uri/3.md), [**nbd\_connect\_vsock**(3)](/nbd_connect_vsock/3.md), [**nbd\_create**(3)](/nbd_create/3.md), [**libnbd**(3)](/libnbd/3.md).

## AUTHORS

Eric Blake

Richard W.M. Jones

## COPYRIGHT

Copyright Red Hat

## LICENSE

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