1 files changed, 158 insertions, 0 deletions
diff --git a/capplets/accessibility/at-properties/dm-util.c b/capplets/accessibility/at-properties/dm-util.c
new file mode 100644
index 00000000..79c5e6e5
--- /dev/null
+++ b/capplets/accessibility/at-properties/dm-util.c
@@ -0,0 +1,158 @@
+/* vi: set sw=4 ts=4 wrap ai: */
+/*
+ * dm-util.c: This file is part of mate-control-center.
+ *
+ * Copyright (C) 2019 Wu Xiaotian <[email protected]>
+ *
+ * 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;
+}