4a5a31edc6
To silence code-style-check complains.
Fixes d44f02ba64
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3018>
220 lines
6.4 KiB
C
220 lines
6.4 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
|
|
|
|
/*
|
|
* Copyright (C) 2014 Red Hat, Inc.
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
/*
|
|
* restart:
|
|
*
|
|
* Smoothly restart the compositor
|
|
*
|
|
* There are some cases where we need to restart Mutter in order
|
|
* to deal with changes in state - the particular case inspiring
|
|
* this is enabling or disabling stereo output. To make this
|
|
* fairly smooth for the user, we need to do two things:
|
|
*
|
|
* - Display a message to the user and make sure that it is
|
|
* actually painted before we exit.
|
|
* - Use a helper program so that the Composite Overlay Window
|
|
* isn't unmapped and mapped.
|
|
*
|
|
* This handles both of these.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <gio/gunixinputstream.h>
|
|
|
|
#include "clutter/clutter.h"
|
|
#include "core/display-private.h"
|
|
#include "core/util-private.h"
|
|
#include "meta/main.h"
|
|
#include "x11/meta-x11-display-private.h"
|
|
|
|
static gboolean restart_helper_started = FALSE;
|
|
static gboolean restart_message_shown = FALSE;
|
|
static gboolean is_restart = FALSE;
|
|
|
|
void
|
|
meta_set_is_restart (gboolean whether)
|
|
{
|
|
is_restart = whether;
|
|
}
|
|
|
|
static void
|
|
restart_check_ready (MetaContext *context)
|
|
{
|
|
if (restart_helper_started && restart_message_shown)
|
|
{
|
|
MetaDisplay *display = meta_context_get_display (context);
|
|
|
|
if (!meta_display_request_restart (display))
|
|
meta_display_show_restart_message (display, NULL);
|
|
}
|
|
}
|
|
|
|
static void
|
|
restart_helper_read_line_callback (GObject *source_object,
|
|
GAsyncResult *res,
|
|
gpointer user_data)
|
|
{
|
|
MetaContext *context = user_data;
|
|
GError *error = NULL;
|
|
gsize length;
|
|
char *line = g_data_input_stream_read_line_finish_utf8 (G_DATA_INPUT_STREAM (source_object),
|
|
res,
|
|
&length, &error);
|
|
if (line == NULL)
|
|
{
|
|
meta_warning ("Failed to read output from restart helper%s%s",
|
|
error ? ": " : NULL,
|
|
error ? error->message : NULL);
|
|
}
|
|
else
|
|
g_free (line); /* We don't actually care what the restart helper outputs */
|
|
|
|
g_object_unref (source_object);
|
|
|
|
restart_helper_started = TRUE;
|
|
restart_check_ready (context);
|
|
}
|
|
|
|
static gboolean
|
|
restart_message_painted (gpointer user_data)
|
|
{
|
|
MetaContext *context = user_data;
|
|
|
|
restart_message_shown = TRUE;
|
|
restart_check_ready (context);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
static void
|
|
child_setup (gpointer user_data)
|
|
{
|
|
MetaDisplay *display = user_data;
|
|
MetaContext *context = meta_display_get_context (display);
|
|
|
|
meta_context_restore_rlimit_nofile (context, NULL);
|
|
}
|
|
|
|
/**
|
|
* meta_restart:
|
|
* @message: (allow-none): message to display to the user, or %NULL
|
|
* @context: a #MetaContext
|
|
*
|
|
* Starts the process of restarting the compositor.
|
|
*
|
|
* Note that Mutter's involvement here is to make the restart
|
|
* visually smooth for the user - it cannot itself safely
|
|
* reexec a program that embeds libmuttter.
|
|
*
|
|
* So in order for this to work, the compositor must handle two
|
|
* signals
|
|
*
|
|
* - [signal@Meta.Display::show-restart-message], to display the
|
|
* message passed here on the Clutter stage
|
|
* - [signal@Meta.Display::restart] to actually reexec the compositor.
|
|
*/
|
|
void
|
|
meta_restart (const char *message,
|
|
MetaContext *context)
|
|
{
|
|
MetaDisplay *display;
|
|
GInputStream *unix_stream;
|
|
GDataInputStream *data_stream;
|
|
GError *error = NULL;
|
|
int helper_out_fd;
|
|
|
|
static const char * const helper_argv[] = {
|
|
MUTTER_LIBEXECDIR "/mutter-restart-helper", NULL
|
|
};
|
|
|
|
g_return_if_fail (META_IS_CONTEXT (context));
|
|
|
|
display = meta_context_get_display (context);
|
|
|
|
if (message && meta_display_show_restart_message (display, message))
|
|
{
|
|
/* Wait until the stage was painted */
|
|
clutter_threads_add_repaint_func_full (CLUTTER_REPAINT_FLAGS_POST_PAINT,
|
|
restart_message_painted,
|
|
context, NULL);
|
|
}
|
|
else
|
|
{
|
|
/* Can't show the message, show the message as soon as the
|
|
* restart helper starts
|
|
*/
|
|
restart_message_painted (context);
|
|
}
|
|
|
|
/* We also need to wait for the restart helper to get its
|
|
* reference to the Composite Overlay Window.
|
|
*/
|
|
if (!g_spawn_async_with_pipes (NULL, /* working directory */
|
|
(char **)helper_argv,
|
|
NULL, /* envp */
|
|
G_SPAWN_DEFAULT,
|
|
child_setup, display,
|
|
NULL, /* child_pid */
|
|
NULL, /* standard_input */
|
|
&helper_out_fd,
|
|
NULL, /* standard_error */
|
|
&error))
|
|
{
|
|
meta_warning ("Failed to start restart helper: %s", error->message);
|
|
goto error;
|
|
}
|
|
|
|
unix_stream = g_unix_input_stream_new (helper_out_fd, TRUE);
|
|
data_stream = g_data_input_stream_new (unix_stream);
|
|
g_object_unref (unix_stream);
|
|
|
|
g_data_input_stream_read_line_async (data_stream, G_PRIORITY_DEFAULT,
|
|
NULL, restart_helper_read_line_callback,
|
|
context);
|
|
|
|
return;
|
|
|
|
error:
|
|
/* If starting the restart helper fails, then we just go ahead and restart
|
|
* immediately. We won't get a smooth transition, since the overlay window
|
|
* will be destroyed and recreated, but otherwise it will work fine.
|
|
*/
|
|
restart_helper_started = TRUE;
|
|
restart_check_ready (context);
|
|
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* meta_is_restart:
|
|
*
|
|
* Returns %TRUE if this instance of Mutter comes from Mutter
|
|
* restarting itself (for example to enable/disable stereo.)
|
|
*
|
|
* See [func@Meta.restart]. If this is the case, any startup visuals
|
|
* or animations should be suppressed.
|
|
*/
|
|
gboolean
|
|
meta_is_restart (void)
|
|
{
|
|
return is_restart;
|
|
}
|