/*
* 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 <inttypes.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <glib.h>
#ifdef G_OS_WIN32
#include <io.h>
#endif
#include <libvirt/libvirt.h>
#include "virt-viewer-events.h"
#include "virt-glib-compat.h"
static GMutex *eventlock = NULL;
struct virt_viewer_events_handle
{
int watch;
int fd;
int events;
int removed;
GIOChannel *channel;
guint source;
virEventHandleCallback cb;
void *opaque;
virFreeCallback ff;
};
static int nextwatch = 1;
static GPtrArray *handles;
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;
g_debug("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;
int ret;
g_mutex_lock(eventlock);
data = g_new0(struct virt_viewer_events_handle, 1);
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;
#ifdef G_OS_WIN32
g_debug("Converted fd %d to handle %"PRIiPTR, fd, _get_osfhandle(fd));
data->channel = g_io_channel_win32_new_socket(_get_osfhandle(fd));
#else
data->channel = g_io_channel_unix_new(fd);
#endif
data->ff = ff;
g_debug("Add handle %d %d %p", data->fd, events, data->opaque);
if (events != 0) {
data->source = g_io_add_watch(data->channel,
cond,
virt_viewer_events_dispatch_handle,
data);
}
g_ptr_array_add(handles, data);
ret = data->watch;
g_mutex_unlock(eventlock);
return ret;
}
static struct virt_viewer_events_handle *
virt_viewer_events_find_handle(int watch)
{
guint i;
for (i = 0 ; i < handles->len ; i++) {
struct virt_viewer_events_handle *h = g_ptr_array_index(handles, i);
if (h == NULL) {
g_warn_if_reached ();
continue;
}
if ((h->watch == watch) && !h->removed) {
return h;
}
}
return NULL;
}
static void
virt_viewer_events_update_handle(int watch,
int events)
{
struct virt_viewer_events_handle *data;
g_mutex_lock(eventlock);
data = virt_viewer_events_find_handle(watch);
if (!data) {
g_debug("Update for missing handle watch %d", watch);
goto cleanup;
}
if (events) {
GIOCondition cond = 0;
if (events == data->events)
goto cleanup;
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)
goto cleanup;
g_source_remove(data->source);
data->source = 0;
data->events = 0;
}
cleanup:
g_mutex_unlock(eventlock);
}
static gboolean
virt_viewer_events_cleanup_handle(gpointer user_data)
{
struct virt_viewer_events_handle *data = user_data;
g_debug("Cleanup of handle %p", data);
g_return_val_if_fail(data != NULL, FALSE);
if (data->ff)
(data->ff)(data->opaque);
g_mutex_lock(eventlock);
g_ptr_array_remove_fast(handles, data);
g_mutex_unlock(eventlock);
return FALSE;
}
static int
virt_viewer_events_remove_handle(int watch)
{
struct virt_viewer_events_handle *data;
int ret = -1;
g_mutex_lock(eventlock);
data = virt_viewer_events_find_handle(watch);
if (!data) {
g_debug("Remove of missing watch %d", watch);
goto cleanup;
}
g_debug("Remove handle %d %d", watch, data->fd);
if (data->source != 0) {
g_source_remove(data->source);
data->source = 0;
data->events = 0;
}
g_warn_if_fail(data->channel != NULL);
g_io_channel_unref(data->channel);
data->channel = NULL;
/* since the actual watch deletion is done asynchronously, a update_handle call may
* reschedule the watch before it's fully deleted, that's why we need to mark it as
* 'removed' to prevent reuse
*/
data->removed = TRUE;
g_idle_add(virt_viewer_events_cleanup_handle, data);
ret = 0;
cleanup:
g_mutex_unlock(eventlock);
return ret;
}
struct virt_viewer_events_timeout
{
int timer;
int interval;
int removed;
guint source;
virEventTimeoutCallback cb;
void *opaque;
virFreeCallback ff;
};
static int nexttimer = 1;
static GPtrArray *timeouts;
static gboolean
virt_viewer_events_dispatch_timeout(void *opaque)
{
struct virt_viewer_events_timeout *data = opaque;
g_debug("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;
int ret;
g_mutex_lock(eventlock);
data = g_new0(struct virt_viewer_events_timeout, 1);
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);
g_ptr_array_add(timeouts, data);
g_debug("Add timeout %p %d %p %p %d", data, interval, cb, opaque, data->timer);
ret = data->timer;
g_mutex_unlock(eventlock);
return ret;
}
static struct virt_viewer_events_timeout *
virt_viewer_events_find_timeout(int timer)
{
guint i;
g_return_val_if_fail(timeouts != NULL, NULL);
for (i = 0 ; i < timeouts->len ; i++) {
struct virt_viewer_events_timeout *t = g_ptr_array_index(timeouts, i);
if (t == NULL) {
g_warn_if_reached ();
continue;
}
if ((t->timer == timer) && !t->removed) {
return t;
}
}
return NULL;
}
static void
virt_viewer_events_update_timeout(int timer,
int interval)
{
struct virt_viewer_events_timeout *data;
g_mutex_lock(eventlock);
data = virt_viewer_events_find_timeout(timer);
if (!data) {
g_debug("Update of missing timer %d", timer);
goto cleanup;
}
g_debug("Update timeout %p %d %d", data, timer, interval);
if (interval >= 0) {
if (data->source)
g_source_remove(data->source);
data->interval = interval;
data->source = g_timeout_add(data->interval,
virt_viewer_events_dispatch_timeout,
data);
} else {
if (!data->source)
goto cleanup;
g_source_remove(data->source);
data->source = 0;
}
cleanup:
g_mutex_unlock(eventlock);
}
static gboolean
virt_viewer_events_cleanup_timeout(gpointer user_data)
{
struct virt_viewer_events_timeout *data = user_data;
g_debug("Cleanup of timeout %p", data);
g_return_val_if_fail(data != NULL, FALSE);
if (data->ff)
(data->ff)(data->opaque);
g_mutex_lock(eventlock);
g_ptr_array_remove_fast(timeouts, data);
g_mutex_unlock(eventlock);
return FALSE;
}
static int
virt_viewer_events_remove_timeout(int timer)
{
struct virt_viewer_events_timeout *data;
int ret = -1;
g_mutex_lock(eventlock);
data = virt_viewer_events_find_timeout(timer);
if (!data) {
g_debug("Remove of missing timer %d", timer);
goto cleanup;
}
g_debug("Remove timeout %p %d", data, timer);
if (data->source != 0) {
g_source_remove(data->source);
data->source = 0;
}
/* since the actual timeout deletion is done asynchronously, a update_timeout call may
* reschedule the timeout before it's fully deleted, that's why we need to mark it as
* 'removed' to prevent reuse
*/
data->removed = TRUE;
g_idle_add(virt_viewer_events_cleanup_timeout, data);
ret = 0;
cleanup:
g_mutex_unlock(eventlock);
return ret;
}
static gpointer event_register_once(gpointer data G_GNUC_UNUSED)
{
eventlock = g_mutex_new();
timeouts = g_ptr_array_new_with_free_func(g_free);
handles = g_ptr_array_new_with_free_func(g_free);
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);
return NULL;
}
void virt_viewer_events_register(void) {
static GOnce once = G_ONCE_INIT;
g_once(&once, event_register_once, NULL);
}
/*
* Local variables:
* c-indent-level: 4
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/