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/*
* inhibit_screensaver.h
*
* Copyright © 2013 Thomas White <taw@bitwiz.org.uk>
* Copyright © 2009-2012 Rémi Denis-Courmont
* Copyright © 2007-2012 Rafaël Carré
*
* This file is part of Colloquium.
*
* Colloquium is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* >>> This file is based on dbus.c from VLC. The original licence is below. <<<
*
*/
/*****************************************************************************
* dbus.c: power management inhibition using D-Bus
*****************************************************************************
* Copyright © 2009-2012 Rémi Denis-Courmont
* Copyright © 2007-2012 Rafaël Carré
*
* This program 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 program 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 program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*
* Based on freedesktop Power Management Specification version 0.2
* http://people.freedesktop.org/~hughsient/temp/power-management-spec-0.2.html
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <dbus/dbus.h>
enum inhibit_api
{
FDO_SS, /**< KDE >= 4 and GNOME >= 3.6 */
FDO_PM, /**< KDE and GNOME <= 2.26 */
MATE, /**< >= 1.0 */
GNOME, /**< GNOME 2.26..3.4 */
};
#define MAX_API (GNOME+1)
/* Currently, all services have identical service and interface names. */
static const char dbus_service[][40] =
{
[FDO_SS] = "org.freedesktop.ScreenSaver",
[FDO_PM] = "org.freedesktop.PowerManagement.Inhibit",
[MATE] = "org.mate.SessionManager",
[GNOME] = "org.gnome.SessionManager",
};
static const char dbus_path[][33] =
{
[FDO_SS] = "/ScreenSaver",
[FDO_PM] = "/org/freedesktop/PowerManagement",
[MATE] = "/org/mate/SessionManager",
[GNOME] = "/org/gnome/SessionManager",
};
static const char dbus_method_uninhibit[][10] =
{
[FDO_SS] = "UnInhibit",
[FDO_PM] = "UnInhibit",
[MATE] = "Uninhibit",
[GNOME] = "Uninhibit",
};
struct inhibit_sys
{
DBusConnection *conn;
DBusPendingCall *pending;
dbus_uint32_t cookie;
enum inhibit_api api;
};
void do_inhibit(struct inhibit_sys *sys, int flags)
{
enum inhibit_api type = sys->api;
/* Receive reply from previous request, possibly hours later ;-) */
if ( sys->pending != NULL ) {
DBusMessage *reply;
/* NOTE: Unfortunately, the pending reply cannot simply be
* cancelled. Otherwise, the cookie would be lost and
* inhibition would remain on (until complete disconnection from
* the bus). */
dbus_pending_call_block(sys->pending);
reply = dbus_pending_call_steal_reply(sys->pending);
dbus_pending_call_unref(sys->pending);
sys->pending = NULL;
if ( reply != NULL ) {
if ( !dbus_message_get_args(reply, NULL,
DBUS_TYPE_UINT32,
&sys->cookie,
DBUS_TYPE_INVALID))
{
sys->cookie = 0;
}
dbus_message_unref(reply);
}
}
/* FIXME: This check is incorrect if flags change from one non-zero value
* to another one. But the D-Bus API cannot currently inhibit suspend
* independently from the screensaver. */
if ( !sys->cookie == !flags ) return; /* nothing to do */
/* Send request */
const char *method = flags ? "Inhibit" : dbus_method_uninhibit[type];
dbus_bool_t ret;
DBusMessage *msg = dbus_message_new_method_call(dbus_service[type],
dbus_path[type],
dbus_service[type],
method);
if ( msg == NULL ) return;
if (flags)
{
const char *app = PACKAGE;
const char *reason = "Presentation in progress";
assert(sys->cookie == 0);
switch (type)
{
case MATE:
case GNOME:
{
dbus_uint32_t xid = 0; // FIXME ?
dbus_uint32_t gflags = 0xC;
ret = dbus_message_append_args(msg, DBUS_TYPE_STRING, &app,
DBUS_TYPE_UINT32, &xid,
DBUS_TYPE_STRING, &reason,
DBUS_TYPE_UINT32, &gflags,
DBUS_TYPE_INVALID);
break;
}
default:
ret = dbus_message_append_args(msg, DBUS_TYPE_STRING, &app,
DBUS_TYPE_STRING, &reason,
DBUS_TYPE_INVALID);
break;
}
if (!ret
|| !dbus_connection_send_with_reply(sys->conn, msg, &sys->pending, -1))
sys->pending = NULL;
}
else
{
assert(sys->cookie != 0);
if (!dbus_message_append_args(msg, DBUS_TYPE_UINT32, &sys->cookie,
DBUS_TYPE_INVALID)
|| !dbus_connection_send (sys->conn, msg, NULL))
sys->cookie = 0;
}
dbus_connection_flush(sys->conn);
dbus_message_unref(msg);
}
void inhibit_cleanup(struct inhibit_sys *sys)
{
if ( sys->pending != NULL ) {
dbus_pending_call_cancel(sys->pending);
dbus_pending_call_unref(sys->pending);
}
dbus_connection_close(sys->conn);
dbus_connection_unref(sys->conn);
free(sys);
}
struct inhibit_sys *inhibit_prepare()
{
struct inhibit_sys *sys;
DBusError err;
int i;
sys = malloc(sizeof(struct inhibit_sys));
if ( sys == NULL ) {
fprintf(stderr, "Failed to allocate inhibit.\n");
return NULL;
}
dbus_error_init(&err);
sys->conn = dbus_bus_get_private(DBUS_BUS_SESSION, &err);
if ( sys->conn == NULL ) {
fprintf(stderr, "cannot connect to session bus: %s\n",
err.message);
dbus_error_free(&err);
free(sys);
return NULL;
}
sys->pending = NULL;
sys->cookie = 0;
for ( i=0; i<MAX_API; i++ ) {
if ( dbus_bus_name_has_owner(sys->conn, dbus_service[i], NULL) )
{
sys->api = i;
return sys;
}
fprintf(stderr, "cannot find service %s\n", dbus_service[i]);
}
inhibit_cleanup(sys);
return NULL;
}
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