| nbd_aio_opt_list_meta_context(3) | LIBNBD | nbd_aio_opt_list_meta_context(3) |
nbd_aio_opt_list_meta_context - request the server to list available meta contexts
#include <libnbd.h>
typedef struct {
int (*callback) (void *user_data, const char *name);
void *user_data;
void (*free) (void *user_data);
} nbd_context_callback;
typedef struct {
int (*callback) (void *user_data, int *error);
void *user_data;
void (*free) (void *user_data);
} nbd_completion_callback;
int nbd_aio_opt_list_meta_context (struct nbd_handle *h,
nbd_context_callback context_callback,
nbd_completion_callback completion_callback);
Request that the server list available meta contexts associated with the export 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.
To determine when the request completes, wait for nbd_aio_is_connecting(3) to return false. Or supply the optional "completion_callback" which will be invoked as described in "Completion callbacks" in libnbd(3), except that it is automatically retired regardless of return value. Note that detecting whether the server returns an error (as is done by the return value of the synchronous counterpart) is only possible with a completion callback.
This call returns an integer ≥ 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).
The handle must be negotiating, otherwise this call will return an error.
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_AIO_OPT_LIST_META_CONTEXT 1
nbd_aio_is_connecting(3), nbd_connect_uri(3), nbd_create(3), nbd_opt_list_meta_context(3), nbd_set_export_name(3), nbd_set_opt_mode(3), libnbd(3).
Eric Blake
Richard W.M. Jones
Copyright (C) 2019-2021 Red Hat Inc.
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
| 2023-01-04 | libnbd-1.14.2 |