/*
* events.c: event loop integration
*
* Copyright (C) 2008-2012 Daniel P. Berrange
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Daniel P. Berrange <berrange@redhat.com>
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <glib.h>
#include <libvirt/libvirt.h>
#include "virt-viewer-events.h"
struct virt_viewer_events_handle
{
int watch;
int fd;
int events;
int enabled;
GIOChannel *channel;
guint source;
virEventHandleCallback cb;
void *opaque;
virFreeCallback ff;
};
static int nextwatch = 1;
static unsigned int nhandles = 0;
static struct virt_viewer_events_handle **handles = NULL;
static gboolean
virt_viewer_events_dispatch_handle(GIOChannel *source G_GNUC_UNUSED,
GIOCondition condition,
gpointer opaque)
{
struct virt_viewer_events_handle *data = opaque;
int events = 0;
if (condition & G_IO_IN)
events |= VIR_EVENT_HANDLE_READABLE;
if (condition & G_IO_OUT)
events |= VIR_EVENT_HANDLE_WRITABLE;
if (condition & G_IO_HUP)
events |= VIR_EVENT_HANDLE_HANGUP;
if (condition & G_IO_ERR)
events |= VIR_EVENT_HANDLE_ERROR;
DEBUG_LOG("Dispatch handler %d %d %p", data->fd, events, data->opaque);
(data->cb)(data->watch, data->fd, events, data->opaque);
return TRUE;
}
static
int virt_viewer_events_add_handle(int fd,
int events,
virEventHandleCallback cb,
void *opaque,
virFreeCallback ff)
{
struct virt_viewer_events_handle *data;
GIOCondition cond = 0;
handles = g_realloc(handles, sizeof(*handles)*(nhandles+1));
data = g_malloc(sizeof(*data));
memset(data, 0, sizeof(*data));
if (events & VIR_EVENT_HANDLE_READABLE)
cond |= G_IO_IN;
if (events & VIR_EVENT_HANDLE_WRITABLE)
cond |= G_IO_OUT;
data->watch = nextwatch++;
data->fd = fd;
data->events = events;
data->cb = cb;
data->opaque = opaque;
data->channel = g_io_channel_unix_new(fd);
data->ff = ff;
DEBUG_LOG("Add handle %d %d %p", data->fd, events, data->opaque);
data->source = g_io_add_watch(data->channel,
cond,
virt_viewer_events_dispatch_handle,
data);
handles[nhandles++] = data;
return data->watch;
}
static struct virt_viewer_events_handle *
virt_viewer_events_find_handle(int watch)
{
unsigned int i;
for (i = 0 ; i < nhandles ; i++)
if (handles[i]->watch == watch)
return handles[i];
return NULL;
}
static void
virt_viewer_events_update_handle(int watch,
int events)
{
struct virt_viewer_events_handle *data = virt_viewer_events_find_handle(watch);
if (!data) {
DEBUG_LOG("Update for missing handle watch %d", watch);
return;
}
if (events) {
GIOCondition cond = 0;
if (events == data->events)
return;
if (data->source)
g_source_remove(data->source);
cond |= G_IO_HUP;
if (events & VIR_EVENT_HANDLE_READABLE)
cond |= G_IO_IN;
if (events & VIR_EVENT_HANDLE_WRITABLE)
cond |= G_IO_OUT;
data->source = g_io_add_watch(data->channel,
cond,
virt_viewer_events_dispatch_handle,
data);
data->events = events;
} else {
if (!data->source)
return;
g_source_remove(data->source);
data->source = 0;
data->events = 0;
}
}
static gboolean
virt_viewer_events_cleanup_handle(gpointer user_data)
{
struct virt_viewer_events_handle *data = user_data;
DEBUG_LOG("Cleanup of handle %p", data);
g_return_val_if_fail(data != NULL, FALSE);
if (data->ff)
(data->ff)(data->opaque);
free(data);
return FALSE;
}
static int
virt_viewer_events_remove_handle(int watch)
{
struct virt_viewer_events_handle *data = virt_viewer_events_find_handle(watch);
if (!data) {
DEBUG_LOG("Remove of missing watch %d", watch);
return -1;
}
DEBUG_LOG("Remove handle %d %d", watch, data->fd);
if (!data->source)
return -1;
g_source_remove(data->source);
data->source = 0;
data->events = 0;
g_idle_add(virt_viewer_events_cleanup_handle, data);
return 0;
}
struct virt_viewer_events_timeout
{
int timer;
int interval;
guint source;
virEventTimeoutCallback cb;
void *opaque;
virFreeCallback ff;
};
static int nexttimer = 1;
static unsigned int ntimeouts = 0;
static struct virt_viewer_events_timeout **timeouts = NULL;
static gboolean
virt_viewer_events_dispatch_timeout(void *opaque)
{
struct virt_viewer_events_timeout *data = opaque;
DEBUG_LOG("Dispatch timeout %p %p %d %p", data, data->cb, data->timer, data->opaque);
(data->cb)(data->timer, data->opaque);
return TRUE;
}
static int
virt_viewer_events_add_timeout(int interval,
virEventTimeoutCallback cb,
void *opaque,
virFreeCallback ff)
{
struct virt_viewer_events_timeout *data;
timeouts = g_realloc(timeouts, sizeof(*timeouts)*(ntimeouts+1));
data = g_malloc(sizeof(*data));
memset(data, 0, sizeof(*data));
data->timer = nexttimer++;
data->interval = interval;
data->cb = cb;
data->opaque = opaque;
data->ff = ff;
if (interval >= 0)
data->source = g_timeout_add(interval,
virt_viewer_events_dispatch_timeout,
data);
timeouts[ntimeouts++] = data;
DEBUG_LOG("Add timeout %p %d %p %p %d", data, interval, cb, opaque, data->timer);
return data->timer;
}
static struct virt_viewer_events_timeout *
virt_viewer_events_find_timeout(int timer)
{
unsigned int i;
for (i = 0 ; i < ntimeouts ; i++)
if (timeouts[i]->timer == timer)
return timeouts[i];
return NULL;
}
static void
virt_viewer_events_update_timeout(int timer,
int interval)
{
struct virt_viewer_events_timeout *data = virt_viewer_events_find_timeout(timer);
if (!data) {
DEBUG_LOG("Update of missing timer %d", timer);
return;
}
DEBUG_LOG("Update timeout %p %d %d", data, timer, interval);
if (interval >= 0) {
if (data->source)
return;
data->interval = interval;
data->source = g_timeout_add(data->interval,
virt_viewer_events_dispatch_timeout,
data);
} else {
if (!data->source)
return;
g_source_remove(data->source);
data->source = 0;
}
}
static gboolean
virt_viewer_events_cleanup_timeout(gpointer user_data)
{
struct virt_viewer_events_timeout *data = user_data;
DEBUG_LOG("Cleanup of timeout %p", data);
g_return_val_if_fail(data != NULL, FALSE);
if (data->ff)
(data->ff)(data->opaque);
free(data);
return FALSE;
}
static int
virt_viewer_events_remove_timeout(int timer)
{
struct virt_viewer_events_timeout *data = virt_viewer_events_find_timeout(timer);
if (!data) {
DEBUG_LOG("Remove of missing timer %d", timer);
return -1;
}
DEBUG_LOG("Remove timeout %p %d", data, timer);
if (!data->source)
return -1;
g_source_remove(data->source);
data->source = 0;
g_idle_add(virt_viewer_events_cleanup_timeout, data);
return 0;
}
void virt_viewer_events_register(void) {
virEventRegisterImpl(virt_viewer_events_add_handle,
virt_viewer_events_update_handle,
virt_viewer_events_remove_handle,
virt_viewer_events_add_timeout,
virt_viewer_events_update_timeout,
virt_viewer_events_remove_timeout);
}
/*
* Local variables:
* c-indent-level: 4
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/