nbd_set_uri_allow_transports - Man Page

set the allowed transports in NBD URIs


 #include <libnbd.h>

 int nbd_set_uri_allow_transports (
       struct nbd_handle *h, uint32_t mask


Set which transports are allowed to appear in NBD URIs.  The default is to allow any transport.

The mask parameter may contain any of the following flags ORed together:




For convenience, the constant LIBNBD_ALLOW_TRANSPORT_MASK is available to describe all transports recognized by this build of libnbd.  A future version of the library may add new flags.

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.

The following parameters must not be NULL: h. For more information see "Non-NULL parameters" in libnbd(3).

Handle State

nbd_set_uri_allow_transports can be called when the handle is in the following state:

 │ Handle created, before connecting   │ ✅ allowed              │
 │ Connecting                          │ ❌ error                │
 │ Connecting & handshaking (opt_mode) │ ❌ error                │
 │ Connected to the server             │ ❌ error                │
 │ Connection shut down                │ ❌ error                │
 │ Handle dead                         │ ❌ 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_connect_uri(3), nbd_create(3), nbd_set_uri_allow_tls(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_connect_uri(3), nbd_set_uri_allow_tls(3).

2024-04-04 libnbd-1.20.0