=head1 NAME

nbd_supports_vsock - true if libnbd was compiled with support for
AF_VSOCK

=head1 SYNOPSIS

 #include <libnbd.h>

 int nbd_supports_vsock (
       struct nbd_handle *h
     );

=head1 DESCRIPTION

Returns true if libnbd was compiled with
support for the C<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
C<VMADDR_CID_LOCAL> as the server name requires that the
I<vsock_loopback> kernel module is loaded.

=head1 RETURN VALUE

This call returns a boolean value.

=head1 ERRORS

This function does not fail.

The following parameters must not be NULL: C<h>.
For more information see L<libnbd(3)/Non-NULL parameters>.

=head1 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

=head1 SEE ALSO

L<nbd_connect_uri(3)>,
L<nbd_connect_vsock(3)>,
L<nbd_create(3)>,
L<libnbd(3)>.

=head1 AUTHORS

Eric Blake

Richard W.M. Jones

=head1 COPYRIGHT

Copyright Red Hat
