add sync tabs + refresh button

CMakeLists.txt

@@ -87,6 +87,14 @@ if(BUILD_TESTING)
     COMMAND renderer-fps-test $<TARGET_FILE:obs-webkit-renderer>)
   set_tests_properties(blur-transition-fps-test PROPERTIES TIMEOUT 20 SKIP_RETURN_CODE 77)
 
+  add_executable(shared-profile-test tests/shared-profile-test.c)
+  target_compile_features(shared-profile-test PRIVATE c_std_11)
+  target_compile_definitions(shared-profile-test PRIVATE _GNU_SOURCE)
+  target_include_directories(shared-profile-test PRIVATE src)
+  add_test(NAME shared-profile-test
+    COMMAND shared-profile-test $<TARGET_FILE:obs-webkit-renderer>)
+  set_tests_properties(shared-profile-test PROPERTIES TIMEOUT 30 SKIP_RETURN_CODE 77)
+
   add_executable(module-load-test tests/module-load-test.c)
   target_compile_features(module-load-test PRIVATE c_std_11)
   target_link_libraries(module-load-test PRIVATE PkgConfig::OBS)

README.md

@@ -21,8 +21,16 @@ DMA-BUF. Кадры передаются в OBS напрямую как BGRA, б
 - перезагрузка страницы и остановка renderer-процесса у скрытого source.
 - пользовательские web-панели в меню «Док-панели» OBS с сохранением URL в
   коллекции сцен, восстановлением после запуска и интерактивным вводом.
+- единый постоянный WebKit-профиль для источников на сцене и web-панелей: общие
+  cookies, HTTP cache, localStorage, IndexedDB, service workers и credentials;
+  страницы одного origin взаимодействуют штатными `storage`-событиями и
+  `BroadcastChannel`, как вкладки одного браузера.
 
 Звук страницы намеренно выключен: добавьте в OBS отдельный Application Audio Capture.
+Все WebView одной сессии OBS работают в общем renderer-процессе и одном
+`WebKitWebContext`; маленькие процессы-посредники сохраняют прежнюю независимую
+жизнь каждого source/dock и изоляцию от OBS. Профиль хранится в стандартных каталогах
+данных и cache пользователя (`obs-webkit-browser/profile`) и переживает перезапуск OBS.
 Renderer наследует X11/XWayland-дисплей OBS; его нативное окно имеет нулевую opacity,
 пустую input shape и не появляется на рабочем столе. Дополнительный display server не
 запускается. WebKit принудительно включает аппаратный compositor и выбирает доступный

data/locale/en-US.ini

@@ -17,3 +17,4 @@ Transparent="Transparent background"
 CustomCSS="Custom CSS"
 ShutdownWhenHidden="Shut down renderer when source is hidden"
 Reload="Reload page"
+Refresh="Refresh"

data/locale/ru-RU.ini

@@ -17,3 +17,4 @@ Transparent="Прозрачный фон"
 CustomCSS="Пользовательский CSS"
 ShutdownWhenHidden="Останавливать рендерер, когда источник скрыт"
 Reload="Перезагрузить страницу"
+Refresh="Обновить"

src/docks.cpp

@@ -6,6 +6,7 @@
 #include <QAction>
 #include <QApplication>
 #include <QByteArray>
+#include <QBoxLayout>
 #include <QContextMenuEvent>
 #include <QDialog>
 #include <QDialogButtonBox>
@@ -600,6 +601,8 @@ public:
 		/* OBS clears frontend callbacks and owns the dock wrappers before
 		 * unloading modules during shutdown. Calling frontend removal APIs
 		 * from obs_module_unload is therefore too late. */
+		refreshButtonTimer_.stop();
+		delete refreshButton_;
 		panels_.clear();
 		if (menuAction_)
 			delete menuAction_;
@@ -607,22 +610,96 @@ public:
 
 	void setupFrontend()
 	{
-		if (menuAction_ || !QApplication::instance())
+		if (!QApplication::instance())
 			return;
 		auto *main = static_cast<QMainWindow *>(obs_frontend_get_main_window());
 		if (!main)
 			return;
+		if (!menuAction_) {
 			menuAction_ = new QAction(text("CustomBrowserDocks"), main);
 			QObject::connect(menuAction_, &QAction::triggered, main, [this] { showEditor(); });
 			if (QMenu *docksMenu = main->findChild<QMenu *>("menuDocks"))
 				docksMenu->addAction(menuAction_);
 			else
 				main->menuBar()->addAction(menuAction_);
+		}
+		setupRefreshButton(main);
 		reconcile();
 	}
 
 private:
 	static QString dockId(const QString &id) { return QString::fromUtf8(kDockPrefix) + id; }
+	static constexpr const char *kSourceId = "webkit_browser_source";
+
+	obs_source_t *currentContextSource() const
+	{
+		if (!contextSourceLabel_)
+			return nullptr;
+		QByteArray name = contextSourceLabel_->text().toUtf8();
+		return obs_get_source_by_name(name.constData());
+	}
+
+	void updateRefreshButton()
+	{
+		if (!refreshButton_)
+			return;
+
+		bool visible = false;
+		obs_source_t *source = currentContextSource();
+		if (source) {
+			const char *id = obs_source_get_unversioned_id(source);
+			visible = id && strcmp(id, kSourceId) == 0;
+			obs_source_release(source);
+		}
+
+		refreshButton_->setVisible(visible);
+		if (sourceInteractButton_)
+			refreshButton_->setText(sourceInteractButton_->text().isEmpty() ? QString() : text("Refresh"));
+	}
+
+	void setupRefreshButton(QMainWindow *main)
+	{
+		if (refreshButton_)
+			return;
+
+		sourceInteractButton_ = main->findChild<QPushButton *>("sourceInteractButton");
+		contextSourceLabel_ = main->findChild<QLabel *>("contextSourceLabel");
+		if (!sourceInteractButton_ || !contextSourceLabel_)
+			return;
+
+		auto *layout = qobject_cast<QBoxLayout *>(sourceInteractButton_->parentWidget()->layout());
+		if (!layout)
+			return;
+
+		refreshButton_ = new QPushButton(text("Refresh"), sourceInteractButton_->parentWidget());
+		refreshButton_->setObjectName("webkitBrowserRefreshButton");
+		refreshButton_->setMinimumHeight(22);
+		refreshButton_->setToolTip(text("Refresh"));
+		refreshButton_->setIcon(QIcon(":/res/images/refresh.svg"));
+		refreshButton_->setProperty("class", "icon-refresh");
+		layout->insertWidget(layout->indexOf(sourceInteractButton_) + 1, refreshButton_);
+
+		QObject::connect(refreshButton_, &QPushButton::clicked, main, [this] {
+			obs_source_t *source = currentContextSource();
+			if (!source)
+				return;
+			const char *id = obs_source_get_unversioned_id(source);
+			if (id && strcmp(id, kSourceId) == 0) {
+				obs_properties_t *properties = obs_source_properties(source);
+				obs_property_t *reload = properties ? obs_properties_get(properties, "reload") : nullptr;
+				if (reload)
+					obs_property_button_clicked(reload, source);
+				if (properties)
+					obs_properties_destroy(properties);
+			}
+			obs_source_release(source);
+		});
+
+		refreshButtonTimer_.setInterval(100);
+		QObject::connect(&refreshButtonTimer_, &QTimer::timeout, main, [this] { updateRefreshButton(); });
+		refreshButtonTimer_.start();
+		updateRefreshButton();
+	}
 
 	static void eventCallback(obs_frontend_event event, void *opaque)
 	{
@@ -803,6 +880,10 @@ private:
 	QVector<DockDefinition> definitions_;
 	QHash<QString, QPointer<WebPanel>> panels_;
 	QPointer<QAction> menuAction_;
+	QPointer<QPushButton> sourceInteractButton_;
+	QPointer<QLabel> contextSourceLabel_;
+	QPointer<QPushButton> refreshButton_;
+	QTimer refreshButtonTimer_;
 };
 
 DockManager *manager = nullptr;

src/renderer.c

@@ -14,15 +14,19 @@
 #include <limits.h>
 #include <pthread.h>
 #include <signal.h>
+#include <stdarg.h>
 #include <stdatomic.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/mman.h>
+#include <sys/socket.h>
 #include <sys/stat.h>
+#include <sys/un.h>
 #include <sys/ipc.h>
 #include <sys/shm.h>
+#include <sys/wait.h>
 #include <unistd.h>
 
 #include "protocol.h"
@@ -40,6 +44,13 @@ struct renderer {
 	struct config config;
 	GtkWidget *window;
 	WebKitWebView *web_view;
+	int control_fd;
+	int frame_fd;
+	int log_fd;
+	int shared_fd;
+	int client_fd;
+	guint control_source;
+	guint client_source;
 	struct owb_shared_frames *shared;
 	size_t shared_size;
 	uint64_t next_sequence;
@@ -59,6 +70,22 @@ struct renderer {
 	bool capture_attached;
 };
 
+static GList *renderers;
+static WebKitWebContext *shared_context;
+static guint idle_source;
+
+static void destroy_renderer(struct renderer *renderer);
+
+static void renderer_log(struct renderer *renderer, const char *format, ...)
+{
+	if (!renderer || renderer->log_fd < 0)
+		return;
+	va_list arguments;
+	va_start(arguments, format);
+	vdprintf(renderer->log_fd, format, arguments);
+	va_end(arguments);
+}
+
 static bool read_exact(int fd, void *data, size_t size)
 {
 	uint8_t *cursor = data;
@@ -74,10 +101,10 @@ static bool read_exact(int fd, void *data, size_t size)
 	return true;
 }
 
-static bool read_config(struct config *config)
+static bool read_config(int fd, struct config *config)
 {
 	struct owb_config_header header;
-	if (!read_exact(STDIN_FILENO, &header, sizeof(header)) || header.magic != OWB_CONFIG_MAGIC ||
+	if (!read_exact(fd, &header, sizeof(header)) || header.magic != OWB_CONFIG_MAGIC ||
 	    header.version != OWB_PROTOCOL_VERSION || header.width < 2 || header.height < 2 ||
 	    header.width > 8192 || header.height > 8192 || header.fps < 1 || header.fps > 60 ||
 	    header.url_length > OWB_MAX_STRING || header.css_length > OWB_MAX_STRING)
@@ -93,8 +120,8 @@ static bool read_config(struct config *config)
 	config->css = calloc((size_t)header.css_length + 1, 1);
 	if (!config->url || !config->css)
 		return false;
-	return read_exact(STDIN_FILENO, config->url, header.url_length) &&
-	       read_exact(STDIN_FILENO, config->css, header.css_length);
+	return read_exact(fd, config->url, header.url_length) &&
+	       read_exact(fd, config->css, header.css_length);
 }
 
 static char *normalize_uri(const char *value)
@@ -162,10 +189,10 @@ static bool map_shared_frames(struct renderer *renderer)
 {
 	struct stat info;
 	renderer->shared_size = owb_shared_size(renderer->config.width, renderer->config.height);
-	if (fstat(OWB_SHARED_FRAME_FD, &info) != 0 || (size_t)info.st_size < renderer->shared_size)
+	if (fstat(renderer->shared_fd, &info) != 0 || (size_t)info.st_size < renderer->shared_size)
 		return false;
 	renderer->shared = mmap(NULL, renderer->shared_size, PROT_READ | PROT_WRITE, MAP_SHARED,
-				OWB_SHARED_FRAME_FD, 0);
+				renderer->shared_fd, 0);
 	if (renderer->shared == MAP_FAILED)
 		return false;
 	return renderer->shared->magic == OWB_SHARED_MAGIC &&
@@ -299,7 +326,7 @@ static void publish_frame(struct renderer *renderer, const uint8_t *pixels, int
 	}
 	__atomic_store_n(&renderer->shared->sequence[slot], complete_sequence, __ATOMIC_RELEASE);
 	uint8_t notification = (uint8_t)slot;
-	ssize_t ignored = write(STDOUT_FILENO, &notification, sizeof(notification));
+	ssize_t ignored = write(renderer->frame_fd, &notification, sizeof(notification));
 	(void)ignored;
 }
 
@@ -352,7 +379,7 @@ static void *capture_loop(void *opaque)
 					None, None);
 			bool published = publish_x11_frame(renderer);
 			if (published && !transport_reported && process_uses_drm_render_node()) {
-				fprintf(stderr, "DRM render node: active\n");
+				renderer_log(renderer, "DRM render node: active\n");
 				transport_reported = true;
 			}
 			first_frame = false;
@@ -498,7 +525,8 @@ static gboolean control_ready(gint fd, GIOCondition condition, gpointer opaque)
 {
 	struct renderer *renderer = opaque;
 	if (condition & (G_IO_HUP | G_IO_ERR)) {
-		gtk_main_quit();
+		renderer->control_source = 0;
+		destroy_renderer(renderer);
 		return G_SOURCE_REMOVE;
 	}
 	for (;;) {
@@ -509,7 +537,8 @@ static gboolean control_ready(gint fd, GIOCondition condition, gpointer opaque)
 		if (count < 0 && (errno == EAGAIN || errno == EWOULDBLOCK))
 			return G_SOURCE_CONTINUE;
 		if (count <= 0) {
-			gtk_main_quit();
+			renderer->control_source = 0;
+			destroy_renderer(renderer);
 			return G_SOURCE_REMOVE;
 		}
 		renderer->command_used += (size_t)count;
@@ -530,22 +559,14 @@ static gboolean clear_window(GtkWidget *widget, cairo_t *context, gpointer unuse
 	return FALSE;
 }
 
-static gboolean terminate_renderer(gpointer opaque)
-{
-	struct renderer *renderer = opaque;
-	atomic_store_explicit(&renderer->stopping, true, memory_order_release);
-	gtk_main_quit();
-	return G_SOURCE_REMOVE;
-}
-
 static void script_message_received(WebKitUserContentManager *manager,
-				    WebKitJavascriptResult *message, gpointer unused)
+				    WebKitJavascriptResult *message, gpointer opaque)
 {
 	(void)manager;
-	(void)unused;
+	struct renderer *renderer = opaque;
 	JSCValue *value = webkit_javascript_result_get_js_value(message);
 	char *text = jsc_value_to_string(value);
-	fprintf(stderr, "Page: %s\n", text ? text : "(empty message)");
+	renderer_log(renderer, "Page: %s\n", text ? text : "(empty message)");
 	g_free(text);
 }
 
@@ -554,34 +575,102 @@ static gboolean load_failed(WebKitWebView *view, WebKitLoadEvent event, const ch
 {
 	(void)view;
 	(void)event;
-	(void)unused;
-	fprintf(stderr, "Page load failed for %s: %s\n", uri, error->message);
+	struct renderer *renderer = unused;
+	renderer_log(renderer, "Page load failed for %s: %s\n", uri, error->message);
 	return FALSE;
 }
 
-int main(void)
+static gboolean exit_when_idle(gpointer unused)
 {
-	struct renderer renderer = {0};
-	atomic_init(&renderer.stopping, false);
-	if (!read_config(&renderer.config)) {
-		fprintf(stderr, "Invalid renderer configuration\n");
-		return 2;
+	(void)unused;
+	idle_source = 0;
+	if (!renderers)
+		gtk_main_quit();
+	return G_SOURCE_REMOVE;
+}
+
+static void destroy_renderer(struct renderer *renderer)
+{
+	if (!renderer)
+		return;
+	renderers = g_list_remove(renderers, renderer);
+	if (renderer->control_source)
+		g_source_remove(renderer->control_source);
+	if (renderer->client_source)
+		g_source_remove(renderer->client_source);
+	atomic_store_explicit(&renderer->stopping, true, memory_order_release);
+	if (renderer->capture_thread_started)
+		pthread_join(renderer->capture_thread, NULL);
+	destroy_x11_capture(renderer);
+	if (renderer->window)
+		gtk_widget_destroy(renderer->window);
+	if (renderer->shared && renderer->shared != MAP_FAILED)
+		munmap(renderer->shared, renderer->shared_size);
+	if (renderer->control_fd >= 0)
+		close(renderer->control_fd);
+	if (renderer->frame_fd >= 0)
+		close(renderer->frame_fd);
+	if (renderer->log_fd >= 0)
+		close(renderer->log_fd);
+	if (renderer->shared_fd >= 0)
+		close(renderer->shared_fd);
+	if (renderer->client_fd >= 0)
+		close(renderer->client_fd);
+	free(renderer->config.url);
+	free(renderer->config.css);
+	free(renderer);
+	if (!renderers && !idle_source)
+		idle_source = g_timeout_add_seconds(2, exit_when_idle, NULL);
+}
+
+static gboolean client_ready(gint fd, GIOCondition condition, gpointer opaque)
+{
+	struct renderer *renderer = opaque;
+	if (condition & (G_IO_HUP | G_IO_ERR | G_IO_NVAL)) {
+		renderer->client_source = 0;
+		destroy_renderer(renderer);
+		return G_SOURCE_REMOVE;
 	}
-	prepare_webkit();
-	if (!map_shared_frames(&renderer)) {
-		fprintf(stderr, "Cannot map shared frame transport\n");
-		return 4;
+	char ignored[16];
+	ssize_t count = recv(fd, ignored, sizeof(ignored), MSG_DONTWAIT);
+	if (count == 0) {
+		renderer->client_source = 0;
+		destroy_renderer(renderer);
+		return G_SOURCE_REMOVE;
 	}
-	if (!gtk_init_check(NULL, NULL)) {
-		fprintf(stderr, "GTK could not connect to the OBS display\n");
-		return 5;
+	return G_SOURCE_CONTINUE;
+}
+
+static struct renderer *create_renderer(int client_fd, const int descriptors[4])
+{
+	struct renderer *renderer = calloc(1, sizeof(*renderer));
+	if (!renderer) {
+		for (size_t index = 0; index < 4; index++)
+			close(descriptors[index]);
+		close(client_fd);
+		return NULL;
+	}
+	renderer->control_fd = descriptors[0];
+	renderer->frame_fd = descriptors[1];
+	renderer->log_fd = descriptors[2];
+	renderer->shared_fd = descriptors[3];
+	renderer->client_fd = client_fd;
+	renderer->capture_shm.shmid = -1;
+	atomic_init(&renderer->stopping, false);
+	if (!read_config(renderer->control_fd, &renderer->config)) {
+		renderer_log(renderer, "Invalid renderer configuration\n");
+		goto fail;
+	}
+	if (!map_shared_frames(renderer)) {
+		renderer_log(renderer, "Cannot map shared frame transport\n");
+		goto fail;
 	}
 
 	WebKitUserContentManager *manager = webkit_user_content_manager_new();
 	g_signal_connect(manager, "script-message-received::owbLog",
-			 G_CALLBACK(script_message_received), NULL);
+			 G_CALLBACK(script_message_received), renderer);
 	if (!webkit_user_content_manager_register_script_message_handler(manager, "owbLog"))
-		fprintf(stderr, "Cannot register page diagnostic message handler\n");
+		renderer_log(renderer, "Cannot register page diagnostic message handler\n");
 	static const char error_reporter[] =
 		"(()=>{const p=(k,v)=>{try{window.webkit.messageHandlers.owbLog.postMessage(k+': '+v)}catch{}};"
 		"addEventListener('error',e=>p('error',e.message+' @ '+e.filename+':'+e.lineno));"
@@ -592,7 +681,7 @@ int main(void)
 		NULL, NULL);
 	webkit_user_content_manager_add_script(manager, reporter);
 	webkit_user_script_unref(reporter);
-	if (renderer.config.transparent) {
+	if (renderer->config.transparent) {
 		static const char transparent_page_css[] =
 			"html,body{background:transparent!important}";
 		WebKitUserStyleSheet *transparent_sheet = webkit_user_style_sheet_new(
@@ -601,96 +690,303 @@ int main(void)
 		webkit_user_content_manager_add_style_sheet(manager, transparent_sheet);
 		webkit_user_style_sheet_unref(transparent_sheet);
 	}
-	if (*renderer.config.css) {
-		WebKitUserStyleSheet *sheet = webkit_user_style_sheet_new(renderer.config.css,
+	if (*renderer->config.css) {
+		WebKitUserStyleSheet *sheet = webkit_user_style_sheet_new(renderer->config.css,
 			WEBKIT_USER_CONTENT_INJECT_ALL_FRAMES, WEBKIT_USER_STYLE_LEVEL_USER, NULL, NULL);
 		webkit_user_content_manager_add_style_sheet(manager, sheet);
 		webkit_user_style_sheet_unref(sheet);
 	}
-	renderer.web_view = WEBKIT_WEB_VIEW(webkit_web_view_new_with_user_content_manager(manager));
-	g_signal_connect(renderer.web_view, "load-failed", G_CALLBACK(load_failed), NULL);
+	renderer->web_view = WEBKIT_WEB_VIEW(g_object_new(
+		WEBKIT_TYPE_WEB_VIEW, "web-context", shared_context,
+		"user-content-manager", manager, NULL));
+	g_signal_connect(renderer->web_view, "load-failed", G_CALLBACK(load_failed), renderer);
 	g_object_unref(manager);
-	WebKitSettings *settings = webkit_web_view_get_settings(renderer.web_view);
+	WebKitSettings *settings = webkit_web_view_get_settings(renderer->web_view);
+	webkit_settings_set_enable_html5_local_storage(settings, TRUE);
 	webkit_settings_set_enable_webgl(settings, TRUE);
 	webkit_settings_set_enable_page_cache(settings, TRUE);
 	webkit_settings_set_enable_smooth_scrolling(settings, TRUE);
 	webkit_settings_set_media_playback_requires_user_gesture(settings, FALSE);
 	webkit_settings_set_hardware_acceleration_policy(settings,
 						 WEBKIT_HARDWARE_ACCELERATION_POLICY_ALWAYS);
-	webkit_web_view_set_is_muted(renderer.web_view, TRUE);
-	GdkRGBA background = renderer.config.transparent ? (GdkRGBA){0, 0, 0, 0} : (GdkRGBA){1, 1, 1, 1};
-	webkit_web_view_set_background_color(renderer.web_view, &background);
+	webkit_web_view_set_is_muted(renderer->web_view, TRUE);
+	GdkRGBA background = renderer->config.transparent ? (GdkRGBA){0, 0, 0, 0} : (GdkRGBA){1, 1, 1, 1};
+	webkit_web_view_set_background_color(renderer->web_view, &background);
 
-	renderer.window = gtk_window_new(GTK_WINDOW_POPUP);
+	renderer->window = gtk_window_new(GTK_WINDOW_POPUP);
 	GdkScreen *screen = gdk_screen_get_default();
-	GdkVisual *visual = renderer.config.transparent ? gdk_screen_get_rgba_visual(screen)
+	GdkVisual *visual = renderer->config.transparent ? gdk_screen_get_rgba_visual(screen)
 							 : gdk_screen_get_system_visual(screen);
 	if (visual)
-		gtk_widget_set_visual(renderer.window, visual);
-	gtk_widget_set_app_paintable(renderer.window, renderer.config.transparent);
-	if (renderer.config.transparent)
-		g_signal_connect(renderer.window, "draw", G_CALLBACK(clear_window), NULL);
-	gtk_window_set_decorated(GTK_WINDOW(renderer.window), FALSE);
-	gtk_window_set_resizable(GTK_WINDOW(renderer.window), FALSE);
-	gtk_window_set_skip_taskbar_hint(GTK_WINDOW(renderer.window), TRUE);
-	gtk_window_set_skip_pager_hint(GTK_WINDOW(renderer.window), TRUE);
-	gtk_window_set_accept_focus(GTK_WINDOW(renderer.window), FALSE);
-	gtk_window_set_focus_on_map(GTK_WINDOW(renderer.window), FALSE);
-	gtk_window_move(GTK_WINDOW(renderer.window), 0, 0);
-	gtk_window_set_default_size(GTK_WINDOW(renderer.window), (int)renderer.config.width,
-				    (int)renderer.config.height);
-	gtk_widget_set_size_request(GTK_WIDGET(renderer.web_view), (int)renderer.config.width,
-				    (int)renderer.config.height);
-	gtk_container_add(GTK_CONTAINER(renderer.window), GTK_WIDGET(renderer.web_view));
-	gtk_widget_realize(renderer.window);
-	GdkWindow *renderer_window = gtk_widget_get_window(renderer.window);
+		gtk_widget_set_visual(renderer->window, visual);
+	gtk_widget_set_app_paintable(renderer->window, renderer->config.transparent);
+	if (renderer->config.transparent)
+		g_signal_connect(renderer->window, "draw", G_CALLBACK(clear_window), NULL);
+	gtk_window_set_decorated(GTK_WINDOW(renderer->window), FALSE);
+	gtk_window_set_resizable(GTK_WINDOW(renderer->window), FALSE);
+	gtk_window_set_skip_taskbar_hint(GTK_WINDOW(renderer->window), TRUE);
+	gtk_window_set_skip_pager_hint(GTK_WINDOW(renderer->window), TRUE);
+	gtk_window_set_accept_focus(GTK_WINDOW(renderer->window), FALSE);
+	gtk_window_set_focus_on_map(GTK_WINDOW(renderer->window), FALSE);
+	gtk_window_move(GTK_WINDOW(renderer->window), 0, 0);
+	gtk_window_set_default_size(GTK_WINDOW(renderer->window), (int)renderer->config.width,
+				    (int)renderer->config.height);
+	gtk_widget_set_size_request(GTK_WIDGET(renderer->web_view), (int)renderer->config.width,
+				    (int)renderer->config.height);
+	gtk_container_add(GTK_CONTAINER(renderer->window), GTK_WIDGET(renderer->web_view));
+	gtk_widget_realize(renderer->window);
+	GdkWindow *renderer_window = gtk_widget_get_window(renderer->window);
 	if (!renderer_window || gdk_window_get_window_type(renderer_window) == GDK_WINDOW_OFFSCREEN) {
-		fprintf(stderr, "GTK did not create the native window required for GPU rendering\n");
-		return 6;
+		renderer_log(renderer, "GTK did not create the native window required for GPU rendering\n");
+		goto fail;
 	}
 	cairo_region_t *empty_input = cairo_region_create();
 	gdk_window_input_shape_combine_region(renderer_window, empty_input, 0, 0);
 	cairo_region_destroy(empty_input);
 	gdk_window_set_opacity(renderer_window, 0.0);
-	gtk_widget_show_all(renderer.window);
+	gtk_widget_show_all(renderer->window);
 	while (gtk_events_pending())
 		gtk_main_iteration();
-	if (!initialize_x11_capture(&renderer)) {
-		fprintf(stderr, "Cannot initialize XComposite/XDamage/XShm GPU capture\n");
-		return 7;
+	if (!initialize_x11_capture(renderer)) {
+		renderer_log(renderer, "Cannot initialize XComposite/XDamage/XShm GPU capture\n");
+		goto fail;
 	}
 
-	int output_flags = fcntl(STDOUT_FILENO, F_GETFL, 0);
+	int output_flags = fcntl(renderer->frame_fd, F_GETFL, 0);
 	if (output_flags >= 0)
-		fcntl(STDOUT_FILENO, F_SETFL, output_flags | O_NONBLOCK);
+		fcntl(renderer->frame_fd, F_SETFL, output_flags | O_NONBLOCK);
 
-	int flags = fcntl(STDIN_FILENO, F_GETFL, 0);
+	int flags = fcntl(renderer->control_fd, F_GETFL, 0);
 	if (flags >= 0)
-		fcntl(STDIN_FILENO, F_SETFL, flags | O_NONBLOCK);
-	g_unix_fd_add(STDIN_FILENO, G_IO_IN | G_IO_HUP | G_IO_ERR, control_ready, &renderer);
-	char *uri = normalize_uri(renderer.config.url);
-	webkit_web_view_load_uri(renderer.web_view, uri);
+		fcntl(renderer->control_fd, F_SETFL, flags | O_NONBLOCK);
+	renderer->control_source = g_unix_fd_add(renderer->control_fd,
+		G_IO_IN | G_IO_HUP | G_IO_ERR, control_ready, renderer);
+	renderer->client_source = g_unix_fd_add(renderer->client_fd,
+		G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL, client_ready, renderer);
+	char *uri = normalize_uri(renderer->config.url);
+	webkit_web_view_load_uri(renderer->web_view, uri);
 	g_free(uri);
-	if (pthread_create(&renderer.capture_thread, NULL, capture_loop, &renderer) != 0) {
-		fprintf(stderr, "Cannot start GPU capture thread\n");
-		return 8;
+	if (pthread_create(&renderer->capture_thread, NULL, capture_loop, renderer) != 0) {
+		renderer_log(renderer, "Cannot start GPU capture thread\n");
+		goto fail;
 	}
-	renderer.capture_thread_started = true;
-	fprintf(stderr, "Ready: WebKitGTK %u.%u.%u, %ux%u@%u, GPU DMA-BUF, XComposite/XShm capture\n",
+	renderer->capture_thread_started = true;
+	renderers = g_list_prepend(renderers, renderer);
+	if (idle_source) {
+		g_source_remove(idle_source);
+		idle_source = 0;
+	}
+	renderer_log(renderer, "Ready: WebKitGTK %u.%u.%u, %ux%u@%u, shared profile, GPU DMA-BUF, XComposite/XShm capture\n",
 		webkit_get_major_version(),
-		webkit_get_minor_version(), webkit_get_micro_version(), renderer.config.width,
-		renderer.config.height, renderer.config.fps);
-	fflush(stderr);
-	g_unix_signal_add(SIGTERM, terminate_renderer, &renderer);
-	g_unix_signal_add(SIGINT, terminate_renderer, &renderer);
+		webkit_get_minor_version(), webkit_get_micro_version(), renderer->config.width,
+		renderer->config.height, renderer->config.fps);
+	return renderer;
+
+fail:
+	destroy_renderer(renderer);
+	return NULL;
+}
+
+static gboolean accept_client(gint server_fd, GIOCondition condition, gpointer unused)
+{
+	(void)unused;
+	if (condition & (G_IO_HUP | G_IO_ERR | G_IO_NVAL)) {
+		gtk_main_quit();
+		return G_SOURCE_REMOVE;
+	}
+	for (;;) {
+		int client_fd = accept4(server_fd, NULL, NULL, SOCK_CLOEXEC);
+		if (client_fd < 0 && errno == EINTR)
+			continue;
+		if (client_fd < 0 && (errno == EAGAIN || errno == EWOULDBLOCK))
+			return G_SOURCE_CONTINUE;
+		if (client_fd < 0)
+			return G_SOURCE_CONTINUE;
+
+		int descriptors[4] = {-1, -1, -1, -1};
+		char byte;
+		struct iovec payload = {.iov_base = &byte, .iov_len = sizeof(byte)};
+		char control[CMSG_SPACE(sizeof(descriptors))];
+		struct msghdr message = {0};
+		message.msg_iov = &payload;
+		message.msg_iovlen = 1;
+		message.msg_control = control;
+		message.msg_controllen = sizeof(control);
+		ssize_t received = recvmsg(client_fd, &message, 0);
+		struct cmsghdr *header = received == 1 ? CMSG_FIRSTHDR(&message) : NULL;
+		if (!header || header->cmsg_level != SOL_SOCKET || header->cmsg_type != SCM_RIGHTS ||
+		    header->cmsg_len != CMSG_LEN(sizeof(descriptors))) {
+			close(client_fd);
+			continue;
+		}
+		memcpy(descriptors, CMSG_DATA(header), sizeof(descriptors));
+		for (size_t index = 0; index < 4; index++) {
+			int flags = fcntl(descriptors[index], F_GETFD);
+			if (flags >= 0)
+				fcntl(descriptors[index], F_SETFD, flags | FD_CLOEXEC);
+		}
+		create_renderer(client_fd, descriptors);
+	}
+}
+
+static gboolean terminate_daemon(gpointer unused)
+{
+	(void)unused;
+	gtk_main_quit();
+	return G_SOURCE_REMOVE;
+}
+
+static socklen_t daemon_address(struct sockaddr_un *address, pid_t owner)
+{
+	memset(address, 0, sizeof(*address));
+	address->sun_family = AF_UNIX;
+	g_snprintf(address->sun_path + 1, sizeof(address->sun_path) - 1,
+		    "obs-webkit-browser-%lu-%ld", (unsigned long)getuid(), (long)owner);
+	return (socklen_t)(offsetof(struct sockaddr_un, sun_path) + 1 +
+			   strlen(address->sun_path + 1));
+}
+
+static int open_daemon_socket(pid_t owner)
+{
+	int fd = socket(AF_UNIX, SOCK_SEQPACKET | SOCK_CLOEXEC, 0);
+	if (fd < 0)
+		return -1;
+	struct sockaddr_un address;
+	socklen_t length = daemon_address(&address, owner);
+	if (connect(fd, (struct sockaddr *)&address, length) == 0)
+		return fd;
+	close(fd);
+	return -1;
+}
+
+static int daemon_main(pid_t owner)
+{
+	if (setsid() < 0)
+		return 10;
+	prepare_webkit();
+	if (!gtk_init_check(NULL, NULL))
+		return 5;
+
+	int server_fd = socket(AF_UNIX, SOCK_SEQPACKET | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
+	if (server_fd < 0)
+		return 10;
+	struct sockaddr_un address;
+	socklen_t address_length = daemon_address(&address, owner);
+	if (bind(server_fd, (struct sockaddr *)&address, address_length) != 0 ||
+	    listen(server_fd, 32) != 0) {
+		close(server_fd);
+		return 10;
+	}
+
+	char *data_directory = g_build_filename(g_get_user_data_dir(),
+						"obs-webkit-browser", "profile", NULL);
+	char *cache_directory = g_build_filename(g_get_user_cache_dir(),
+						 "obs-webkit-browser", "profile", NULL);
+	g_mkdir_with_parents(data_directory, 0700);
+	g_mkdir_with_parents(cache_directory, 0700);
+	WebKitWebsiteDataManager *data_manager = webkit_website_data_manager_new(
+		"base-data-directory", data_directory,
+		"base-cache-directory", cache_directory, NULL);
+	webkit_website_data_manager_set_persistent_credential_storage_enabled(data_manager, TRUE);
+	WebKitCookieManager *cookie_manager =
+		webkit_website_data_manager_get_cookie_manager(data_manager);
+	char *cookie_file = g_build_filename(data_directory, "cookies.sqlite", NULL);
+	webkit_cookie_manager_set_persistent_storage(cookie_manager, cookie_file,
+					     WEBKIT_COOKIE_PERSISTENT_STORAGE_SQLITE);
+	webkit_cookie_manager_set_accept_policy(cookie_manager, WEBKIT_COOKIE_POLICY_ACCEPT_ALWAYS);
+	shared_context = webkit_web_context_new_with_website_data_manager(data_manager);
+	webkit_web_context_set_cache_model(shared_context, WEBKIT_CACHE_MODEL_WEB_BROWSER);
+	g_object_unref(data_manager);
+	g_free(cookie_file);
+	g_free(data_directory);
+	g_free(cache_directory);
+
+	/* The first proxy inherited these descriptors when it forked this daemon.
+	 * Only the SCM_RIGHTS copies accepted above may own an individual view. */
+	close(STDIN_FILENO);
+	close(STDOUT_FILENO);
+	close(STDERR_FILENO);
+	close(OWB_SHARED_FRAME_FD);
+
+	g_unix_fd_add(server_fd, G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
+		      accept_client, NULL);
+	g_unix_signal_add(SIGTERM, terminate_daemon, NULL);
+	g_unix_signal_add(SIGINT, terminate_daemon, NULL);
 	gtk_main();
 
-	atomic_store_explicit(&renderer.stopping, true, memory_order_release);
-	if (renderer.capture_thread_started)
-		pthread_join(renderer.capture_thread, NULL);
-	destroy_x11_capture(&renderer);
-	munmap(renderer.shared, renderer.shared_size);
-	free(renderer.config.url);
-	free(renderer.config.css);
+	while (renderers)
+		destroy_renderer(renderers->data);
+	if (idle_source) {
+		g_source_remove(idle_source);
+		idle_source = 0;
+	}
+	g_object_unref(shared_context);
+	shared_context = NULL;
+	close(server_fd);
+	return 0;
+}
+
+static bool pass_view_descriptors(int client_fd)
+{
+	int descriptors[4] = {STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO,
+			      OWB_SHARED_FRAME_FD};
+	char byte = 1;
+	struct iovec payload = {.iov_base = &byte, .iov_len = sizeof(byte)};
+	char control[CMSG_SPACE(sizeof(descriptors))];
+	memset(control, 0, sizeof(control));
+	struct msghdr message = {0};
+	message.msg_iov = &payload;
+	message.msg_iovlen = 1;
+	message.msg_control = control;
+	message.msg_controllen = sizeof(control);
+	struct cmsghdr *header = CMSG_FIRSTHDR(&message);
+	header->cmsg_level = SOL_SOCKET;
+	header->cmsg_type = SCM_RIGHTS;
+	header->cmsg_len = CMSG_LEN(sizeof(descriptors));
+	memcpy(CMSG_DATA(header), descriptors, sizeof(descriptors));
+	return sendmsg(client_fd, &message, MSG_NOSIGNAL) == 1;
+}
+
+int main(void)
+{
+	pid_t owner = getppid();
+	pid_t launched_daemon = 0;
+	int client_fd = open_daemon_socket(owner);
+	if (client_fd < 0) {
+		launched_daemon = fork();
+		if (launched_daemon < 0)
+			return 10;
+		if (launched_daemon == 0)
+			_exit(daemon_main(owner));
+		for (unsigned attempt = 0; attempt < 200 && client_fd < 0; attempt++) {
+			struct timespec pause = {.tv_nsec = 10000000L};
+			nanosleep(&pause, NULL);
+			client_fd = open_daemon_socket(owner);
+		}
+	}
+	if (client_fd < 0) {
+		int status = 0;
+		if (launched_daemon > 0 && waitpid(launched_daemon, &status, WNOHANG) == launched_daemon &&
+		    WIFEXITED(status))
+			return WEXITSTATUS(status);
+		fprintf(stderr, "Cannot start the shared WebKit renderer process\n");
+		return 10;
+	}
+	if (launched_daemon > 0)
+		waitpid(launched_daemon, NULL, WNOHANG);
+	if (!pass_view_descriptors(client_fd)) {
+		fprintf(stderr, "Cannot attach view to the shared WebKit renderer process\n");
+		close(client_fd);
+		return 11;
+	}
+
+	close(STDIN_FILENO);
+	close(STDOUT_FILENO);
+	close(STDERR_FILENO);
+	close(OWB_SHARED_FRAME_FD);
+	char ignored;
+	while (recv(client_fd, &ignored, sizeof(ignored), 0) < 0 && errno == EINTR) {
+	}
+	close(client_fd);
 	return 0;
 }

tests/shared-profile-test.c

@@ -0,0 +1,202 @@
+#include "protocol.h"
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <poll.h>
+#include <signal.h>
+#include <spawn.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+extern char **environ;
+
+struct view {
+	pid_t pid;
+	int control;
+	int frames;
+	int shared_fd;
+	struct owb_shared_frames *shared;
+	size_t shared_size;
+};
+
+static bool write_all(int fd, const void *data, size_t size)
+{
+	const uint8_t *cursor = data;
+	while (size) {
+		ssize_t count = write(fd, cursor, size);
+		if (count < 0 && errno == EINTR)
+			continue;
+		if (count <= 0)
+			return false;
+		cursor += (size_t)count;
+		size -= (size_t)count;
+	}
+	return true;
+}
+
+static void serve_pages(int server)
+{
+	static const char page[] =
+		"<!doctype html><style>html,body{margin:0;width:100%;height:100%;background:rgb(2,3,5)}</style>"
+		"<script>const p=new URL(location.href),t=p.searchParams.get('token'),"
+		"k='owb-shared-profile-test',b=new BroadcastChannel(k);"
+		"if(p.pathname==='/writer'){setInterval(()=>{localStorage.setItem(k,t);b.postMessage(t)},100)}"
+		"else{let heard=false;b.onmessage=e=>{if(e.data===t)heard=true};"
+		"setInterval(()=>{if(heard&&localStorage.getItem(k)===t)"
+		"document.body.style.background='rgb(17,231,43)'},50)}</script>";
+	char response[2048];
+	int length = snprintf(response, sizeof(response),
+		"HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nCache-Control: no-store\r\n"
+		"Connection: close\r\nContent-Length: %zu\r\n\r\n%s",
+		strlen(page), page);
+	for (;;) {
+		int client = accept(server, NULL, NULL);
+		if (client < 0 && errno == EINTR)
+			continue;
+		if (client < 0)
+			_exit(0);
+		char request[1024];
+		ssize_t ignored = read(client, request, sizeof(request));
+		(void)ignored;
+		write_all(client, response, (size_t)length);
+		close(client);
+	}
+}
+
+static bool start_view(struct view *view, const char *renderer, const char *url)
+{
+	memset(view, 0, sizeof(*view));
+	view->pid = 0;
+	view->control = view->frames = view->shared_fd = -1;
+	int control[2] = {-1, -1};
+	int frames[2] = {-1, -1};
+	if (socketpair(AF_UNIX, SOCK_STREAM, 0, control) != 0 || pipe(frames) != 0)
+		return false;
+	const uint32_t width = 64, height = 64;
+	view->shared_size = owb_shared_size(width, height);
+	view->shared_fd = memfd_create("shared-profile-test", MFD_CLOEXEC);
+	if (view->shared_fd < 0 || ftruncate(view->shared_fd, (off_t)view->shared_size) != 0)
+		return false;
+	view->shared = mmap(NULL, view->shared_size, PROT_READ | PROT_WRITE, MAP_SHARED,
+			    view->shared_fd, 0);
+	if (view->shared == MAP_FAILED)
+		return false;
+	memset(view->shared, 0, sizeof(*view->shared));
+	view->shared->magic = OWB_SHARED_MAGIC;
+	view->shared->version = OWB_PROTOCOL_VERSION;
+	view->shared->width = width;
+	view->shared->height = height;
+	view->shared->stride = width * 4;
+	view->shared->slot_count = OWB_SHARED_FRAME_SLOTS;
+
+	posix_spawn_file_actions_t actions;
+	posix_spawn_file_actions_init(&actions);
+	posix_spawn_file_actions_adddup2(&actions, control[1], STDIN_FILENO);
+	posix_spawn_file_actions_adddup2(&actions, frames[1], STDOUT_FILENO);
+	posix_spawn_file_actions_adddup2(&actions, view->shared_fd, OWB_SHARED_FRAME_FD);
+	char *arguments[] = {(char *)renderer, NULL};
+	int error = posix_spawn(&view->pid, renderer, &actions, NULL, arguments, environ);
+	posix_spawn_file_actions_destroy(&actions);
+	close(control[1]);
+	close(frames[1]);
+	if (error)
+		return false;
+	view->control = control[0];
+	view->frames = frames[0];
+	struct owb_config_header config = {
+		.magic = OWB_CONFIG_MAGIC, .version = OWB_PROTOCOL_VERSION,
+		.width = width, .height = height, .fps = 20, .transparent = 0,
+		.hardware_acceleration = 1, .url_length = (uint32_t)strlen(url), .css_length = 0,
+	};
+	return write_all(view->control, &config, sizeof(config)) &&
+	       write_all(view->control, url, strlen(url));
+}
+
+static int stop_view(struct view *view)
+{
+	int status = 0;
+	if (view->control >= 0) {
+		shutdown(view->control, SHUT_RDWR);
+		close(view->control);
+	}
+	if (view->frames >= 0)
+		close(view->frames);
+	if (view->shared && view->shared != MAP_FAILED)
+		munmap(view->shared, view->shared_size);
+	if (view->shared_fd >= 0)
+		close(view->shared_fd);
+	if (view->pid > 0) {
+		kill(view->pid, SIGTERM);
+		while (waitpid(view->pid, &status, 0) < 0 && errno == EINTR) {
+		}
+	}
+	return status;
+}
+
+int main(int argc, char **argv)
+{
+	if (argc != 2)
+		return 2;
+	int server = socket(AF_INET, SOCK_STREAM, 0);
+	int enabled = 1;
+	setsockopt(server, SOL_SOCKET, SO_REUSEADDR, &enabled, sizeof(enabled));
+	struct sockaddr_in address = {.sin_family = AF_INET, .sin_addr.s_addr = htonl(INADDR_LOOPBACK)};
+	if (server < 0 || bind(server, (struct sockaddr *)&address, sizeof(address)) != 0 ||
+	    listen(server, 16) != 0)
+		return 77;
+	socklen_t address_size = sizeof(address);
+	if (getsockname(server, (struct sockaddr *)&address, &address_size) != 0)
+		return 2;
+	pid_t http_server = fork();
+	if (http_server == 0)
+		serve_pages(server);
+	close(server);
+
+	char writer_url[256], reader_url[256];
+	unsigned port = ntohs(address.sin_port);
+	snprintf(writer_url, sizeof(writer_url), "http://127.0.0.1:%u/writer?token=%ld", port,
+		 (long)getpid());
+	snprintf(reader_url, sizeof(reader_url), "http://127.0.0.1:%u/reader?token=%ld", port,
+		 (long)getpid());
+	struct view writer, reader;
+	bool started_writer = start_view(&writer, argv[1], writer_url);
+	bool started_reader = started_writer && start_view(&reader, argv[1], reader_url);
+	bool shared = false;
+	for (unsigned attempt = 0; started_reader && attempt < 200; attempt++) {
+		struct pollfd item = {.fd = reader.frames, .events = POLLIN};
+		if (poll(&item, 1, 100) <= 0)
+			continue;
+		uint8_t slot;
+		if (read(reader.frames, &slot, sizeof(slot)) != 1 || slot >= OWB_SHARED_FRAME_SLOTS)
+			continue;
+		uint8_t *frame = owb_shared_slot(reader.shared, slot);
+		size_t center = ((size_t)32 * 64 + 32) * 4;
+		uint8_t *bgra = frame + center;
+		if (bgra[0] < 55 && bgra[1] > 210 && bgra[2] < 35 && bgra[3] == 255) {
+			shared = true;
+			break;
+		}
+	}
+	int reader_status = started_reader ? stop_view(&reader) : 0;
+	int writer_status = started_writer ? stop_view(&writer) : 0;
+	kill(http_server, SIGTERM);
+	waitpid(http_server, NULL, 0);
+	if (!started_writer || !started_reader)
+		return 2;
+	if ((WIFEXITED(reader_status) && WEXITSTATUS(reader_status) == 5) ||
+	    (WIFEXITED(writer_status) && WEXITSTATUS(writer_status) == 5))
+		return 77;
+	if (!shared) {
+		fprintf(stderr, "two renderer views did not share localStorage and BroadcastChannel\n");
+		return 1;
+	}
+	return 0;
+}