NAME

       nbd_get_uri - construct an NBD URI for a connection

SYNOPSIS

        #include <libnbd.h>

        char * nbd_get_uri (
                 struct nbd_handle *h
               );

DESCRIPTION

       This makes a best effort attempt to construct an NBD URI which could be used to connect
       back to the same server (using nbd_connect_uri(3)).

       In some cases there is not enough information in the handle to successfully create a URI
       (eg. if you connected with nbd_connect_socket(3)).  In such cases the call returns "NULL"
       and further diagnostic information is available via nbd_get_errno(3) and nbd_get_error(3)
       as usual.

       Even if a URI is returned it is not guaranteed to work, and it may not be optimal.

       nbdinfo(1) --uri option is a way to access this API from shell scripts.

RETURN VALUE

       This call returns a string.  The caller must free the returned string to avoid a memory
       leak.

ERRORS

       On error "NULL" 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_get_uri can be called when the handle is in the following states:

        ┌─────────────────────────────────────┬─────────────────────────┐
        │ Handle created, before connecting   │ ❌ error                │
        │ Connecting                          │ ✅ allowed              │
        │ Connecting & handshaking (opt_mode) │ ✅ allowed              │
        │ Connected to the server             │ ✅ allowed              │
        │ Connection shut down                │ ✅ allowed              │
        │ Handle dead                         │ ✅ allowed              │
        └─────────────────────────────────────┴─────────────────────────┘

VERSION

       This function first appeared in libnbd 1.8.

       If you need to test if this function is available at compile time check if the following
       macro is defined:

        #define LIBNBD_HAVE_NBD_GET_URI 1

SEE ALSO

       nbd_aio_connect_uri(3), nbd_connect_socket(3), nbd_connect_uri(3), nbd_create(3),
       nbd_get_errno(3), nbd_get_error(3), nbd_supports_uri(3), libnbd(3), nbdinfo(1).

AUTHORS

       Eric Blake

       Richard W.M. Jones

COPYRIGHT

       Copyright Red Hat

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