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/*
* libdevice-node
*
* Copyright (c) 2015 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include <hw/systemd.h>
#include <systemd/sd-bus.h>
#define SYSTEMD_DBUS_SERVICE "org.freedesktop.systemd1"
#define SYSTEMD_DBUS_PATH "/org/freedesktop/systemd1"
#define SYSTEMD_DBUS_MANAGER_IFACE "org.freedesktop.systemd1.Manager"
#define SYSTEMD_SOCKET_SUFFIX ".socket"
#define MAX_SOCKET_NAME 1024
#define SYSTEMD_SERVICE_SUFFIX ".service"
#define MAX_SERVICE_NAME 1024
#ifndef EXPORT
#define EXPORT __attribute__ ((visibility("default")))
#endif
struct bus_ctx {
const char *unit;
sd_event *loop;
};
static int socket_started(sd_bus_message *m, void *userdata,
sd_bus_error *ret_error)
{
struct bus_ctx *ctx = userdata;
char *signal_unit;
int ret;
ret = sd_bus_message_read(m, "uoss", NULL, NULL, &signal_unit, NULL);
if (ret < 0) {
sd_event_exit(ctx->loop, ret);
return 0;
}
if (!strcmp(signal_unit, ctx->unit))
sd_event_exit(ctx->loop, 0);
return 0;
}
static int systemd_unit_interface_sync(const char *method, const char *unit,
bool wait)
{
sd_bus *bus = NULL;
sd_event *loop = NULL;
struct bus_ctx ctx;
int ret;
ret = sd_bus_open_system(&bus);
if (ret < 0)
return ret;
if (wait) {
ret = sd_event_new(&loop);
if (ret < 0)
goto unref_bus;
ctx.loop = loop;
ctx.unit = unit;
ret = sd_bus_attach_event(bus, loop, SD_EVENT_PRIORITY_NORMAL);
if (ret < 0)
goto unref_loop;
ret = sd_bus_add_match(bus, NULL,
"type='signal',"
"sender='" SYSTEMD_DBUS_SERVICE "',"
"interface='" SYSTEMD_DBUS_MANAGER_IFACE "',"
"member='JobRemoved',"
"path_namespace='" SYSTEMD_DBUS_PATH "'",
socket_started,
&ctx);
if (ret < 0)
goto unref_loop;
}
ret = sd_bus_call_method(bus,
SYSTEMD_DBUS_SERVICE,
SYSTEMD_DBUS_PATH,
SYSTEMD_DBUS_MANAGER_IFACE,
method,
NULL,
NULL,
"ss",
unit,
"replace");
if (ret < 0)
goto unref_loop;
if (wait)
ret = sd_event_loop(loop);
unref_loop:
if (wait)
sd_event_unref(loop);
unref_bus:
sd_bus_unref(bus);
return ret;
}
EXPORT int systemd_start_service(const char *service_name)
{
char unit[MAX_SERVICE_NAME];
int ret;
ret = snprintf(unit, sizeof(unit), "%s" SYSTEMD_SERVICE_SUFFIX,
service_name);
if (ret < 0 || ret >= sizeof(unit))
return -ENAMETOOLONG;
return systemd_unit_interface_sync("StartUnit", unit, true);
}
EXPORT int systemd_stop_service(const char *service_name)
{
char unit[MAX_SERVICE_NAME];
int ret;
ret = snprintf(unit, sizeof(unit), "%s" SYSTEMD_SERVICE_SUFFIX,
service_name);
if (ret < 0 || ret >= sizeof(unit))
return -ENAMETOOLONG;
return systemd_unit_interface_sync("StopUnit", unit, false);
}
EXPORT int systemd_start_socket(const char *socket_name)
{
char unit[MAX_SOCKET_NAME];
int ret;
ret = snprintf(unit, sizeof(unit), "%s" SYSTEMD_SOCKET_SUFFIX,
socket_name);
if (ret < 0 || ret >= sizeof(unit))
return -ENAMETOOLONG;
return systemd_unit_interface_sync("StartUnit", unit, true);
}
EXPORT int systemd_stop_socket(const char *socket_name)
{
char unit[MAX_SOCKET_NAME];
int ret;
ret = snprintf(unit, sizeof(unit), "%s" SYSTEMD_SOCKET_SUFFIX,
socket_name);
if (ret < 0 || ret >= sizeof(unit))
return -ENAMETOOLONG;
return systemd_unit_interface_sync("StopUnit", unit, false);
}
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