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/*
* libvirt-stream.h
* Summary: APIs for management of streams
* Description: Provides APIs for the management of streams
* Author: Daniel Veillard <veillard@redhat.com>
*
* Copyright (C) 2006-2014 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 2.1 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, see
* <http://www.gnu.org/licenses/>.
*/
#ifndef __VIR_LIBVIRT_STREAM_H__
# define __VIR_LIBVIRT_STREAM_H__
# ifndef __VIR_LIBVIRT_H_INCLUDES__
# error "Don't include this file directly, only use libvirt/libvirt.h"
# endif
typedef enum {
VIR_STREAM_NONBLOCK = (1 << 0),
} virStreamFlags;
virStreamPtr virStreamNew(virConnectPtr conn,
unsigned int flags);
int virStreamRef(virStreamPtr st);
int virStreamSend(virStreamPtr st,
const char *data,
size_t nbytes);
int virStreamRecv(virStreamPtr st,
char *data,
size_t nbytes);
/**
* virStreamSourceFunc:
*
* @st: the stream object
* @data: preallocated array to be filled with data
* @nbytes: size of the data array
* @opaque: optional application provided data
*
* The virStreamSourceFunc callback is used together
* with the virStreamSendAll function for libvirt to
* obtain the data that is to be sent.
*
* The callback will be invoked multiple times,
* fetching data in small chunks. The application
* should fill the 'data' array with up to 'nbytes'
* of data and then return the number actual number
* of bytes. The callback will continue to be
* invoked until it indicates the end of the source
* has been reached by returning 0. A return value
* of -1 at any time will abort the send operation
*
* Returns the number of bytes filled, 0 upon end
* of file, or -1 upon error
*/
typedef int (*virStreamSourceFunc)(virStreamPtr st,
char *data,
size_t nbytes,
void *opaque);
int virStreamSendAll(virStreamPtr st,
virStreamSourceFunc handler,
void *opaque);
/**
* virStreamSinkFunc:
*
* @st: the stream object
* @data: preallocated array to be filled with data
* @nbytes: size of the data array
* @opaque: optional application provided data
*
* The virStreamSinkFunc callback is used together
* with the virStreamRecvAll function for libvirt to
* provide the data that has been received.
*
* The callback will be invoked multiple times,
* providing data in small chunks. The application
* should consume up 'nbytes' from the 'data' array
* of data and then return the number actual number
* of bytes consumed. The callback will continue to be
* invoked until it indicates the end of the stream
* has been reached. A return value of -1 at any time
* will abort the receive operation
*
* Returns the number of bytes consumed or -1 upon
* error
*/
typedef int (*virStreamSinkFunc)(virStreamPtr st,
const char *data,
size_t nbytes,
void *opaque);
int virStreamRecvAll(virStreamPtr st,
virStreamSinkFunc handler,
void *opaque);
typedef enum {
VIR_STREAM_EVENT_READABLE = (1 << 0),
VIR_STREAM_EVENT_WRITABLE = (1 << 1),
VIR_STREAM_EVENT_ERROR = (1 << 2),
VIR_STREAM_EVENT_HANGUP = (1 << 3),
} virStreamEventType;
/**
* virStreamEventCallback:
*
* @stream: stream on which the event occurred
* @events: bitset of events from virEventHandleType constants
* @opaque: user data registered with handle
*
* Callback for receiving stream events. The callback will
* be invoked once for each event which is pending.
*/
typedef void (*virStreamEventCallback)(virStreamPtr stream, int events, void *opaque);
int virStreamEventAddCallback(virStreamPtr stream,
int events,
virStreamEventCallback cb,
void *opaque,
virFreeCallback ff);
int virStreamEventUpdateCallback(virStreamPtr stream,
int events);
int virStreamEventRemoveCallback(virStreamPtr stream);
int virStreamFinish(virStreamPtr st);
int virStreamAbort(virStreamPtr st);
int virStreamFree(virStreamPtr st);
#endif /* __VIR_LIBVIRT_STREAM_H__ */
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