weston/ivi-shell/ivi-shell.h

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/*
* Copyright (C) 2013 DENSO CORPORATION
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef WESTON_IVI_SHELL_H
#define WESTON_IVI_SHELL_H
#include <stdbool.h>
#include "compositor.h"
struct ivi_shell
{
struct wl_listener destroy_listener;
struct weston_compositor *compositor;
struct wl_list ivi_surface_list; /* struct ivi_shell_surface::link */
text_backend: make destructor call explicit We used to rely on the order in which the weston_compositor::destroy_signal callbacks happened, to not access freed memory. Don't know when, but this broke at least with ivi-shell, which caused crashes in random places on compositor shutdown. Valgrind found the following: Invalid write of size 8 at 0xC2EDC69: unbind_input_panel (input-panel-ivi.c:340) by 0x4E3B6BB: destroy_resource (wayland-server.c:537) by 0x4E3E085: for_each_helper.isra.0 (wayland-util.c:359) by 0x4E3E60D: wl_map_for_each (wayland-util.c:365) by 0x4E3BEC7: wl_client_destroy (wayland-server.c:675) by 0x4182F2: text_backend_notifier_destroy (text-backend.c:1047) by 0x4084FB: wl_signal_emit (wayland-server-core.h:264) by 0x4084FB: main (compositor.c:5465) Address 0x67ea360 is 208 bytes inside a block of size 232 free'd at 0x4C2A6BC: free (vg_replace_malloc.c:473) by 0x4084FB: wl_signal_emit (wayland-server-core.h:264) by 0x4084FB: main (compositor.c:5465) Invalid write of size 8 at 0x4E3E0D7: wl_list_remove (wayland-util.c:57) by 0xC2EDEE9: destroy_input_panel_surface (input-panel-ivi.c:191) by 0x4E3B6BB: destroy_resource (wayland-server.c:537) by 0x4E3BC7B: wl_resource_destroy (wayland-server.c:550) by 0x40DB8B: wl_signal_emit (wayland-server-core.h:264) by 0x40DB8B: weston_surface_destroy (compositor.c:1883) by 0x40DB8B: weston_surface_destroy (compositor.c:1873) by 0x4E3B6BB: destroy_resource (wayland-server.c:537) by 0x4E3E085: for_each_helper.isra.0 (wayland-util.c:359) by 0x4E3E60D: wl_map_for_each (wayland-util.c:365) by 0x4E3BEC7: wl_client_destroy (wayland-server.c:675) by 0x4182F2: text_backend_notifier_destroy (text-backend.c:1047) by 0x4084FB: wl_signal_emit (wayland-server-core.h:264) by 0x4084FB: main (compositor.c:5465) Address 0x67ea370 is 224 bytes inside a block of size 232 free'd at 0x4C2A6BC: free (vg_replace_malloc.c:473) by 0x4084FB: wl_signal_emit (wayland-server-core.h:264) by 0x4084FB: main (compositor.c:5465) Invalid write of size 8 at 0x4E3E0E7: wl_list_remove (wayland-util.c:58) by 0xC2EDEE9: destroy_input_panel_surface (input-panel-ivi.c:191) by 0x4E3B6BB: destroy_resource (wayland-server.c:537) by 0x4E3BC7B: wl_resource_destroy (wayland-server.c:550) by 0x40DB8B: wl_signal_emit (wayland-server-core.h:264) by 0x40DB8B: weston_surface_destroy (compositor.c:1883) by 0x40DB8B: weston_surface_destroy (compositor.c:1873) by 0x4E3B6BB: destroy_resource (wayland-server.c:537) by 0x4E3E085: for_each_helper.isra.0 (wayland-util.c:359) by 0x4E3E60D: wl_map_for_each (wayland-util.c:365) by 0x4E3BEC7: wl_client_destroy (wayland-server.c:675) by 0x4182F2: text_backend_notifier_destroy (text-backend.c:1047) by 0x4084FB: wl_signal_emit (wayland-server-core.h:264) by 0x4084FB: main (compositor.c:5465) Address 0x67ea368 is 216 bytes inside a block of size 232 free'd at 0x4C2A6BC: free (vg_replace_malloc.c:473) by 0x4084FB: wl_signal_emit (wayland-server-core.h:264) by 0x4084FB: main (compositor.c:5465) Looking at the first of these, unbind_input_panel() gets called when the text-backend destroys its helper client which has bound to input_panel interface. This happens after the shell's destroy_signal callback has been called, so the shell has already been freed. The other two errors come from wl_list_remove(&input_panel_surface->link); which has gone stale when the shell was destroyed (shell->input_panel.surfaces list). Rather than creating even more destroy listeners and hooking them up in spaghetti, modify text-backend to not hook up to the compositor destroy signal. Instead, make it the text_backend_init() callers' responsibility to also call text_backend_destroy() appropriately, before the shell goes away. This fixed all the above Valgrind errors, and avoid a crash with ivi-shell when exiting Weston. Also using desktop-shell exhibited similar Valgrind errors which are fixed by this patch, but those didn't happen to cause any crashes AFAIK. Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk> Reviewed-By: Derek Foreman <derekf@osg.samsung.com>
2015-06-24 16:09:17 +03:00
struct text_backend *text_backend;
struct wl_listener show_input_panel_listener;
struct wl_listener hide_input_panel_listener;
struct wl_listener update_input_panel_listener;
struct weston_layer input_panel_layer;
bool locked;
bool showing_input_panels;
struct {
struct weston_surface *surface;
pixman_box32_t cursor_rectangle;
} text_input;
struct {
struct wl_resource *binding;
struct wl_list surfaces;
} input_panel;
};
struct weston_view *
get_default_view(struct weston_surface *surface);
int
input_panel_setup(struct ivi_shell *shell);
void
input_panel_destroy(struct ivi_shell *shell);
#endif /* WESTON_IVI_SHELL_H */