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/* 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>
* Copyright (C) 2019-2021 MATE developers
*
* 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;
}
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