1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
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
157
158
|
/* vi: set sw=4 ts=4 wrap ai: */
/*
* dm-util.c: This file is part of mate-control-center.
*
* Copyright (C) 2019 Wu Xiaotian <yetist@gmail.com>
*
* This program 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 2 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/>.
* */
#include <gio/gio.h>
#include "dm-util.h"
static GDBusProxy *get_sys_proxy (void)
{
GError *error = NULL;
GDBusProxy *proxy = NULL;
proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
G_DBUS_PROXY_FLAGS_NONE,
NULL,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
NULL,
&error);
if (proxy == NULL) {
g_warning ("Couldn't connect to system bus: %s", error->message);
g_error_free (error);
}
return proxy;
}
static gboolean dm_is_running (void)
{
GDBusProxy *proxy;
GError *error = NULL;
GVariant *ret;
gboolean running = FALSE;
proxy = get_sys_proxy ();
if (proxy == NULL)
return FALSE;
ret = g_dbus_proxy_call_sync (proxy,
"NameHasOwner",
g_variant_new ("(s)", "org.freedesktop.DisplayManager"),
G_DBUS_CALL_FLAGS_NONE,
-1,
NULL,
&error);
if (ret == NULL) {
g_warning ("Couldn't call dbus method: %s", error->message);
g_error_free (error);
} else {
g_variant_get (ret, "(b)", &running);
g_variant_unref (ret);
}
if (proxy)
g_object_unref (proxy);
return running;
}
static gint
dm_get_pid (GError **err)
{
GDBusProxy *proxy;
GError *error = NULL;
GVariant *ret;
guint32 pid = 0;
proxy = get_sys_proxy ();
if (proxy == NULL)
return FALSE;
ret = g_dbus_proxy_call_sync (proxy,
"GetConnectionUnixProcessID",
g_variant_new ("(s)", "org.freedesktop.DisplayManager"),
G_DBUS_CALL_FLAGS_NONE,
-1,
NULL,
&error);
if (ret == NULL) {
g_propagate_error (err, error);
} else {
g_variant_get (ret, "(u)", &pid);
g_variant_unref (ret);
}
if (proxy)
g_object_unref (proxy);
return pid;
}
static gchar* get_cmdline_from_pid (gint pid)
{
gchar path[255];
gchar *text = NULL;
gchar *cmdline = NULL;
GError *error = NULL;
g_snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
if (!g_file_get_contents (path, &text, NULL, &error)) {
g_warning ("get cmdline error: %s\n", error->message);
g_error_free (error);
return NULL;
} else {
cmdline = g_path_get_basename (text);
g_free (text);
}
return cmdline;
}
DMType dm_get_type(void)
{
gint pid;
gchar *cmdline;
DMType dmtype = DM_TYPE_UNKNOWN;
if (!dm_is_running()) {
goto ret;
}
pid = dm_get_pid (NULL);
if (pid <= 1) {
goto ret;
}
cmdline = get_cmdline_from_pid (pid);
if (cmdline == NULL) {
goto ret;
}
if (g_strcmp0(cmdline, "lightdm") == 0) {
dmtype = DM_TYPE_LIGHTDM;
} else if (g_strcmp0(cmdline, "mdm") == 0) {
dmtype = DM_TYPE_MDM;
} else if (g_strcmp0(cmdline, "gdm") == 0) {
dmtype = DM_TYPE_GDM;
}
g_free (cmdline);
ret:
return dmtype;
}
|
