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/*
* virdbus.c: helper for using DBus
*
* Copyright (C) 2012 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/>.
*
*/
#include <config.h>
#include "virdbus.h"
#include "memory.h"
#include "virterror_internal.h"
#include "logging.h"
#include "threads.h"
#define VIR_FROM_THIS VIR_FROM_DBUS
#ifdef HAVE_DBUS
static DBusConnection *systembus = NULL;
static virOnceControl once = VIR_ONCE_CONTROL_INITIALIZER;
static DBusError dbuserr;
static dbus_bool_t virDBusAddWatch(DBusWatch *watch, void *data);
static void virDBusRemoveWatch(DBusWatch *watch, void *data);
static void virDBusToggleWatch(DBusWatch *watch, void *data);
static void virDBusSystemBusInit(void)
{
/* Allocate and initialize a new HAL context */
dbus_connection_set_change_sigpipe(FALSE);
dbus_threads_init_default();
dbus_error_init(&dbuserr);
if (!(systembus = dbus_bus_get(DBUS_BUS_SYSTEM, &dbuserr)))
return;
dbus_connection_set_exit_on_disconnect(systembus, FALSE);
/* Register dbus watch callbacks */
if (!dbus_connection_set_watch_functions(systembus,
virDBusAddWatch,
virDBusRemoveWatch,
virDBusToggleWatch,
NULL, NULL)) {
systembus = NULL;
return;
}
}
DBusConnection *virDBusGetSystemBus(void)
{
if (virOnce(&once, virDBusSystemBusInit) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Unable to run one time DBus initializer"));
return NULL;
}
if (!systembus) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to get DBus system bus connection: %s"),
dbuserr.message ? dbuserr.message : "watch setup failed");
return NULL;
}
return systembus;
}
static void virDBusWatchCallback(int fdatch ATTRIBUTE_UNUSED,
int fd ATTRIBUTE_UNUSED,
int events, void *opaque)
{
DBusWatch *watch = opaque;
int dbus_flags = 0;
if (events & VIR_EVENT_HANDLE_READABLE)
dbus_flags |= DBUS_WATCH_READABLE;
if (events & VIR_EVENT_HANDLE_WRITABLE)
dbus_flags |= DBUS_WATCH_WRITABLE;
if (events & VIR_EVENT_HANDLE_ERROR)
dbus_flags |= DBUS_WATCH_ERROR;
if (events & VIR_EVENT_HANDLE_HANGUP)
dbus_flags |= DBUS_WATCH_HANGUP;
(void)dbus_watch_handle(watch, dbus_flags);
while (dbus_connection_dispatch(systembus) == DBUS_DISPATCH_DATA_REMAINS)
/* keep dispatching while data remains */;
}
static int virDBusTranslateWatchFlags(int dbus_flags)
{
unsigned int flags = 0;
if (dbus_flags & DBUS_WATCH_READABLE)
flags |= VIR_EVENT_HANDLE_READABLE;
if (dbus_flags & DBUS_WATCH_WRITABLE)
flags |= VIR_EVENT_HANDLE_WRITABLE;
if (dbus_flags & DBUS_WATCH_ERROR)
flags |= VIR_EVENT_HANDLE_ERROR;
if (dbus_flags & DBUS_WATCH_HANGUP)
flags |= VIR_EVENT_HANDLE_HANGUP;
return flags;
}
struct virDBusWatch
{
int watch;
};
static void virDBusWatchFree(void *data) {
struct virDBusWatch *info = data;
VIR_FREE(info);
}
static dbus_bool_t virDBusAddWatch(DBusWatch *watch,
void *data ATTRIBUTE_UNUSED)
{
int flags = 0;
int fd;
struct virDBusWatch *info;
if (VIR_ALLOC(info) < 0)
return 0;
if (dbus_watch_get_enabled(watch))
flags = virDBusTranslateWatchFlags(dbus_watch_get_flags(watch));
# if HAVE_DBUS_WATCH_GET_UNIX_FD
fd = dbus_watch_get_unix_fd(watch);
# else
fd = dbus_watch_get_fd(watch);
# endif
info->watch = virEventAddHandle(fd, flags,
virDBusWatchCallback,
watch, NULL);
if (info->watch < 0) {
VIR_FREE(info);
return 0;
}
dbus_watch_set_data(watch, info, virDBusWatchFree);
return 1;
}
static void virDBusRemoveWatch(DBusWatch *watch,
void *data ATTRIBUTE_UNUSED)
{
struct virDBusWatch *info;
info = dbus_watch_get_data(watch);
(void)virEventRemoveHandle(info->watch);
}
static void virDBusToggleWatch(DBusWatch *watch,
void *data ATTRIBUTE_UNUSED)
{
int flags = 0;
struct virDBusWatch *info;
if (dbus_watch_get_enabled(watch))
flags = virDBusTranslateWatchFlags(dbus_watch_get_flags(watch));
info = dbus_watch_get_data(watch);
(void)virEventUpdateHandle(info->watch, flags);
}
#else /* ! HAVE_DBUS */
DBusConnection *virDBusGetSystemBus(void)
{
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("DBus support not compiled into this binary"));
return NULL;
}
#endif /* ! HAVE_DBUS */
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