nbdkit_shutdown - Man Page
request shutdown or client disconnection
Synopsis
#include <nbdkit-plugin.h> void nbdkit_shutdown (void); void nbdkit_disconnect (int force);
Description
Plugins and filters can call exit(3) in the configuration phase (before and including .get_ready, but not in connected callbacks).
Once nbdkit has started serving connections, plugins and filters should not call exit(3). However they may instruct nbdkit to shut down by calling nbdkit_shutdown, or to disconnect a single client by calling nbdkit_disconnect.
nbdkit_shutdown
nbdkit_shutdown requests nbdkit to shut down asynchronously and returns (note that it does not exit the process immediately).
It ensures that the plugin and all filters are unloaded cleanly which may take some time. Further callbacks from nbdkit into the plugin or filter may occur after you have called this.
nbdkit_disconnect
nbdkit_disconnect requests that the current client connection be disconnected. It does not affect other connections, and it does not stop the same client from trying to reconnect.
It is only useful from connected callbacks — that is, after (but not including) .open, and before .close. To reject a client in .preconnect, .open or .list_exports you should return an error instead.
If force is true, nbdkit will disconnect the client immediately, and the client will not receive any response to the current command or any other commands in flight in parallel threads. If force is false, nbdkit will not accept any new commands from the client (failing all commands other than NBD_CMD_DISC with ESHUTDOWN), but will allow existing commands to complete gracefully. Either way, the next callback for the current connection should be .close.
Language Bindings
NBDKit.shutdown : unit -> unit NBDKit.disconnect : bool -> unit
import nbdkit nbdkit.shutdown() nbdkit.disconnect(force)
In nbdkit-rust-plugin(3):
use nbdkit::*; pub fn shutdown() pub fn disconnect(force: bool)
In nbdkit-sh-plugin(3), there are various magic error codes that can be returned to indicate that shutdown or disconnection is needed. See that documentation for a full description.
History
nbdkit_shutdown was added in nbdkit 1.20. nbdkit_disconnect was added in nbdkit 1.34.
See Also
Authors
Eric Blake
Richard W.M. Jones
Copyright
Copyright Red Hat
License
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
- Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
- Neither the name of Red Hat nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Referenced By
NBDKit(3), nbdkit_nanosleep(3), nbdkit-plugin(3), nbdkit-sh-plugin(3), nbdkit-time-limit-filter(1).
The man page nbdkit_disconnect(3) is an alias of nbdkit_shutdown(3).