Provided by: libnbd-dev_1.10.5-1_amd64 bug

NAME
       nbd_opt_info - request the server for information about an export


SYNOPSIS
        #include <libnbd.h>

        int nbd_opt_info (struct nbd_handle *h);


DESCRIPTION
       Request that the server supply information about the export name previously specified by the most recent
       nbd_set_export_name(3) or nbd_connect_uri(3).  This can only be used if nbd_set_opt_mode(3) enabled
       option mode.

       If successful, functions like nbd_is_read_only(3) and nbd_get_size(3) will report details about that
       export.  In general, if nbd_opt_go(3) is called next, that call will likely succeed with the details
       remaining the same, although this is not guaranteed by all servers.

       Not all servers understand this request, and even when it is understood, the server might fail the
       request even when a corresponding nbd_opt_go(3) would succeed.


RETURN VALUE
       If the call is successful the function returns 0.


ERRORS
       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 negotiating, otherwise this call will return an error.


VERSION
       This function first appeared in libnbd 1.4.

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

        #define LIBNBD_HAVE_NBD_OPT_INFO 1


SEE ALSO
       nbd_aio_opt_info(3), nbd_connect_uri(3), nbd_create(3), nbd_get_size(3), nbd_is_read_only(3),
       nbd_opt_go(3), nbd_set_export_name(3), nbd_set_opt_mode(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