usb_moded-systemd.c
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
* @file usb_moded-systemd.c
*
* Copyright (C) 2013-2018 Jolla oy. All rights reserved.
*
* @author: Philippe De Swert <philippe.deswert@jollamobile.com>
* @author: Slava Monich <slava.monich@jolla.com>
* @author: Simo Piiroinen <simo.piiroinen@jollamobile.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the Lesser GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* 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 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
*/
24
25
26
27
28
29
30
31
32
33
34
35
36
#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-private.h"
#include "usb_moded.h"
#include "usb_moded-log.h"
#include "usb_moded-systemd.h"
37
38
39
40
/* ========================================================================= *
* Constants
* ========================================================================= */
41
42
43
44
#define SYSTEMD_DBUS_SERVICE "org.freedesktop.systemd1"
#define SYSTEMD_DBUS_PATH "/org/freedesktop/systemd1"
#define SYSTEMD_DBUS_INTERFACE "org.freedesktop.systemd1.Manager"
45
46
47
48
49
50
51
52
53
54
55
56
57
/* ========================================================================= *
* Prototypes
* ========================================================================= */
/* -- systemd -- */
gboolean systemd_control_service(const char *name, const char *method);
gboolean systemd_control_start (void);
void systemd_control_stop (void);
/* ========================================================================= *
* Data
* ========================================================================= */
58
59
60
61
/* SystemBus connection ref used for systemd control ipc */
static DBusConnection *systemd_con = NULL;
62
63
64
65
/* ========================================================================= *
* Functions
* ========================================================================= */
66
67
68
// QDBusObjectPath org.freedesktop.systemd1.Manager.StartUnit(QString name, QString mode)
// QDBusObjectPath org.freedesktop.systemd1.Manager.StopUnit(QString name, QString mode)
69
// mode = replace
70
// method = StartUnit or StopUnit
71
gboolean systemd_control_service(const char *name, const char *method)
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
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 */
157
if( (systemd_con = umdbus_get_connection()) == 0 )
158
159
160
161
162
{
log_err("Could not connect to dbus for systemd control\n");
goto cleanup;
}
ack = TRUE;
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
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;
}