Provided by: libnbd-dev_1.14.1-1_amd64 bug

NAME
       nbd_get_nr_meta_contexts - return the current number of requested meta contexts


SYNOPSIS
        #include <libnbd.h>

        ssize_t nbd_get_nr_meta_contexts (struct nbd_handle *h);


DESCRIPTION
       During connection libnbd can negotiate zero or more metadata contexts with the server.
       Metadata contexts are features (such as "base:allocation") which describe information
       returned by the nbd_block_status(3) command (for "base:allocation" this is whether blocks
       of data are allocated, zero or sparse).

       This command returns how many meta contexts have been added to the list to request from
       the server via nbd_add_meta_context(3).  The server is not obligated to honor all of the
       requests; to see what it actually supports, see nbd_can_meta_context(3).


RETURN VALUE
       This call returns an integer size ≥ 0.


ERRORS
       On error "-1" is returned.

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


VERSION
       This function first appeared in libnbd 1.6.

       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_NR_META_CONTEXTS 1


SEE ALSO
       nbd_add_meta_context(3), nbd_block_status(3), nbd_can_meta_context(3),
       nbd_clear_meta_contexts(3), nbd_create(3), nbd_get_meta_context(3), libnbd(3).


AUTHORS
       Eric Blake

       Richard W.M. Jones


COPYRIGHT
       Copyright (C) 2019-2021 Red Hat Inc.


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