nbd\_supports\_vsock(3) LIBNBD nbd\_supports\_vsock(3)

# [NAME](#NAME)

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

# [SYNOPSIS](#SYNOPSIS)

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

# [DESCRIPTION](#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](#RETURN_VALUE)

This call returns a boolean value.

# [ERRORS](#ERRORS)

This function does not fail.

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

# [VERSION](#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](#SEE_ALSO)

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

# [AUTHORS](#AUTHORS)

Eric Blake

Richard W.M. Jones

# [COPYRIGHT](#COPYRIGHT)

Copyright Red Hat

# [LICENSE](#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

2026-10-11 libnbd-1.25.7

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Document: nbd_supports_vsock(3) from libnbd 1.25.7-r3 (Chainguard OS)