#include <libnbd.h> int nbd_connect_vsock (struct nbd_handle *h, uint32_t cid, uint32_t port);
Connect (synchronously) over the
AF_VSOCK protocol from a virtual machine to an NBD server, usually running on the host. The
port parameters specify the server address. Usually
cid should be
2 (to connect to the host), and
port might be
10809 or another port number assigned to you by the host administrator.
Not all systems support
AF_VSOCK; to determine if libnbd was built on a system with vsock support, see nbd_supports_vsock(3).
This call returns when the connection has been made. By default, this proceeds all the way to transmission phase, but nbd_set_opt_mode(3) can be used for manual control over option negotiation performed before transmission phase.
If the call is successful the function returns
-1 is returned.
Refer to “ERROR HANDLING” in libnbd(3) for how to get further details of the error.
The handle must be newly created, otherwise this call will return an error.
This function first appeared in libnbd 1.2.
If you need to test if this function is available at compile time check if the following macro is defined:
#define LIBNBD_HAVE_NBD_CONNECT_VSOCK 1
nbd_aio_connect_vsock(3), nbd_create(3), nbd_set_opt_mode(3), nbd_supports_vsock(3), libnbd(3).
Richard W.M. Jones
Copyright (C) 2019-2021 Red Hat Inc.
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
libnbd(3), libnbd-release-notes-1.2(1), NBD(3), nbd_aio_connect_vsock(3), nbd_connect_uri(3), nbdfuse(1), nbd_supports_vsock(3), nbdublk(1).