usb_moded-systemd.c
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@file usb_moded-systemd.c
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Copyright (C) 2013-2016 Jolla oy. All rights reserved.
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@author: Philippe De Swert <philippe.deswert@jollamobile.com>
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@author: Simo Piiroinen <simo.piiroinen@jollamobile.com>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the Lesser GNU General Public License
version 2 as published by the Free Software Foundation.
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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.
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You should have received a copy of the Lesser GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <dbus/dbus.h>
#include <dbus/dbus-glib.h>
#include <dbus/dbus-glib-lowlevel.h>
#include "usb_moded-dbus.h"
#include "usb_moded-dbus-private.h"
#include "usb_moded.h"
#include "usb_moded-log.h"
#include "usb_moded-systemd.h"
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#define SYSTEMD_DBUS_SERVICE "org.freedesktop.systemd1"
#define SYSTEMD_DBUS_PATH "/org/freedesktop/systemd1"
#define SYSTEMD_DBUS_INTERFACE "org.freedesktop.systemd1.Manager"
/* SystemBus connection ref used for systemd control ipc */
static DBusConnection *systemd_con = NULL;
// QDBusObjectPath org.freedesktop.systemd1.Manager.StartUnit(QString name, QString mode)
// QDBusObjectPath org.freedesktop.systemd1.Manager.StopUnit(QString name, QString mode)
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// mode = replace
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// method = StartUnit or StopUnit
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gboolean systemd_control_service(const char *name, const char *method)
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DBusMessage *req = NULL;
DBusMessage *rsp = NULL;
DBusError err = DBUS_ERROR_INIT;
const char *arg = "replace";
const char *res = 0;
log_debug("%s(%s) ...", method, name);
if( !systemd_con ) {
log_err("not connected to system bus; skip systemd unit control");
goto EXIT;
}
req = dbus_message_new_method_call(SYSTEMD_DBUS_SERVICE,
SYSTEMD_DBUS_PATH,
SYSTEMD_DBUS_INTERFACE,
method);
if( !req ) {
log_err("failed to construct %s.%s request",
SYSTEMD_DBUS_INTERFACE,
method);
goto EXIT;
}
if( !dbus_message_append_args(req,
DBUS_TYPE_STRING, &name,
DBUS_TYPE_STRING, &arg,
DBUS_TYPE_INVALID))
{
log_debug("error appending arguments");
goto EXIT;
}
rsp = dbus_connection_send_with_reply_and_block(systemd_con, req, -1, &err);
if( !rsp ) {
log_err("no reply to %s.%s request: %s: %s",
SYSTEMD_DBUS_INTERFACE,
method,
err.name, err.message);
goto EXIT;
}
if( dbus_set_error_from_message(&err, rsp) ) {
log_err("got error reply to %s.%s request: %s: %s",
SYSTEMD_DBUS_INTERFACE,
method,
err.name, err.message);
goto EXIT;
}
if( !dbus_message_get_args(rsp, &err,
DBUS_TYPE_OBJECT_PATH, &res,
DBUS_TYPE_INVALID) ) {
log_err("failed to parse reply to %s.%s request: %s: %s",
SYSTEMD_DBUS_INTERFACE,
method,
err.name, err.message);
goto EXIT;
}
EXIT:
dbus_error_free(&err);
if( rsp ) dbus_message_unref(rsp);
if( req ) dbus_message_unref(req);
log_debug("%s(%s) -> %s", method, name, res ?: "N/A");
return res != 0;
}
/* ========================================================================= *
* start/stop systemd control availability
* ========================================================================= */
gboolean
systemd_control_start(void)
{
gboolean ack = FALSE;
log_debug("starting systemd control");
/* Get connection ref */
if( (systemd_con = usb_moded_dbus_get_connection()) == 0 )
{
log_err("Could not connect to dbus for systemd control\n");
goto cleanup;
}
ack = TRUE;
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cleanup:
return ack;
}
void
systemd_control_stop(void)
{
log_debug("stopping systemd control");
if(systemd_con)
{
/* Let go of connection ref */
dbus_connection_unref(systemd_con),
systemd_con = 0;
}