nbd_connect_socket - Man Page

connect directly to a connected socket


 #include <libnbd.h>

 int nbd_connect_socket (struct nbd_handle *h, int sock);


Pass a connected socket (file descriptor) which libnbd will talk to.  The program is responsible for connecting this somehow to an NBD server.  Once the socket is passed to libnbd it is the responsibility of libnbd.  Libnbd may read and write to it, set it to non-blocking, etc., and will finally close it when the handle is closed.  The program must no longer use the socket.

Return Value

If the call is successful the function returns 0.


On error -1 is returned.

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

Handle State

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:


See Also

nbd_create(3), libnbd(3).


Eric Blake

Richard W.M. Jones


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

Referenced By

libnbd(3), libnbd-release-notes-1.2(1), NBD(3), nbd_aio_connect_socket(3), nbdfuse(1), nbdkit-nbd-plugin(1).

2020-10-05 libnbd-1.5.4