Initial D-Bus signal support.

example/main.c

@@ -81,15 +81,9 @@ int timer_done(void *data) {
 	return 1;
 }
 
-int dpms_on(void *data) {
+int timer_change_vt(void *data) {
-	struct wlr_backend *backend = data;
+	struct wlr_session *session = data;
-	wlr_drm_backend_dpms(backend, false);
+	wlr_session_change_vt(session, 7);
-	return 1;
-}
-
-int dpms_off(void *data) {
-	struct wlr_backend *backend = data;
-	wlr_drm_backend_dpms(backend, true);
 	return 1;
 }
 
@@ -117,7 +111,7 @@ int main() {
 	struct wl_display *display = wl_display_create();
 	struct wl_event_loop *event_loop = wl_display_get_event_loop(display);
 
-	struct wlr_session *session = wlr_session_start();
+	struct wlr_session *session = wlr_session_start(display);
 	if (!session) {
 		return 1;
 	}
@@ -132,14 +126,11 @@ int main() {
 	bool done = false;
 	struct wl_event_source *timer = wl_event_loop_add_timer(event_loop,
 		timer_done, &done);
-	struct wl_event_source *timer_dpms_on = wl_event_loop_add_timer(event_loop,
+	struct wl_event_source *timer_vt = wl_event_loop_add_timer(event_loop,
-		dpms_on, wlr);
+		timer_change_vt, session);
-	struct wl_event_source *timer_dpms_off = wl_event_loop_add_timer(event_loop,
-		dpms_off, wlr);
 
-	wl_event_source_timer_update(timer, 20000);
+	wl_event_source_timer_update(timer, 30000);
-	wl_event_source_timer_update(timer_dpms_on, 5000);
+	wl_event_source_timer_update(timer_vt, 5000);
-	wl_event_source_timer_update(timer_dpms_off, 10000);
 
 	while (!done) {
 		wl_event_loop_dispatch(event_loop, 0);

include/session/interface.h

@@ -4,11 +4,12 @@
 struct wlr_session;
 
 struct session_interface {
-	struct wlr_session *(*start)(void);
+	struct wlr_session *(*start)(struct wl_display *disp);
 	void (*finish)(struct wlr_session *session);
 	int (*open)(struct wlr_session *restrict session,
 		const char *restrict path);
 	void (*close)(struct wlr_session *session, int fd);
+	bool (*change_vt)(struct wlr_session *session, int vt);
 };
 
 struct wlr_session {

include/wlr/session.h

@@ -1,12 +1,15 @@
 #ifndef WLR_SESSION_H
 #define WLR_SESSION_H
 
+#include <wayland-server.h>
+
 struct wlr_session;
 
-struct wlr_session *wlr_session_start(void);
+struct wlr_session *wlr_session_start(struct wl_display *disp);
 void wlr_session_finish(struct wlr_session *session);
 int wlr_session_open_file(struct wlr_session *restrict session,
 	const char *restrict path);
 void wlr_session_close_file(struct wlr_session *session, int fd);
+bool wlr_session_change_vt(struct wlr_session *session, int vt);
 
 #endif

session/direct.c

@@ -2,6 +2,7 @@
 
 #include <errno.h>
 #include <stdlib.h>
+#include <stdbool.h>
 #include <string.h>
 #include <fcntl.h>
 #include <unistd.h>
@@ -23,13 +24,18 @@ static void direct_session_close(struct wlr_session *base, int fd) {
 	close(fd);
 }
 
+static bool direct_change_vt(struct wlr_session *base, int vt) {
+	// TODO
+	return false;
+}
+
 static void direct_session_finish(struct wlr_session *base) {
 	struct direct_session *session = wl_container_of(base, session, base);
 
 	free(session);
 }
 
-static struct wlr_session *direct_session_start(void) {
+static struct wlr_session *direct_session_start(struct wl_display *disp) {
 	struct direct_session *session = calloc(1, sizeof(*session));
 	if (!session) {
 		wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
@@ -47,4 +53,5 @@ const struct session_interface session_direct_iface = {
 	.finish = direct_session_finish,
 	.open = direct_session_open,
 	.close = direct_session_close,
+	.change_vt = direct_change_vt,
 };

session/logind.c

@@ -20,6 +20,7 @@ struct logind_session {
 	struct wlr_session base;
 
 	sd_bus *bus;
+	struct wl_event_source *event;
 
 	char *id;
 	char *path;
@@ -53,7 +54,7 @@ static int logind_take_device(struct wlr_session *restrict base,
 	int paused = 0;
 	ret = sd_bus_message_read(msg, "hb", &fd, &paused);
 	if (ret < 0) {
-		wlr_log(L_ERROR, "Failed to parse DBus response for '%s': %s",
+		wlr_log(L_ERROR, "Failed to parse D-Bus response for '%s': %s",
 			path, strerror(-ret));
 		goto error;
 	}
@@ -97,6 +98,25 @@ static void logind_release_device(struct wlr_session *base, int fd) {
 	sd_bus_message_unref(msg);
 }
 
+static bool logind_change_vt(struct wlr_session *base, int vt) {
+	struct logind_session *session = wl_container_of(base, session, base);
+
+	int ret;
+	sd_bus_message *msg = NULL;
+	sd_bus_error error = SD_BUS_ERROR_NULL;
+
+	ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
+		"/org/freedesktop/login1/seat/self", "org.freedesktop.login1.Seat", "SwitchTo",
+		&error, &msg, "u", (uint32_t)vt);
+	if (ret < 0) {
+		wlr_log(L_ERROR, "Failed to change to vt '%d'", vt);
+	}
+
+	sd_bus_error_free(&error);
+	sd_bus_message_unref(msg);
+	return ret >= 0;
+}
+
 static bool session_activate(struct logind_session *session) {
 	int ret;
 	sd_bus_message *msg = NULL;
@@ -152,6 +172,7 @@ static void logind_session_finish(struct wlr_session *base) {
 
 	release_control(session);
 
+	wl_event_source_remove(session->event);
 	sd_bus_unref(session->bus);
 	free(session->id);
 	free(session->path);
@@ -159,7 +180,62 @@ static void logind_session_finish(struct wlr_session *base) {
 	free(session);
 }
 
-static struct wlr_session *logind_session_start(void) {
+static int session_removed(sd_bus_message *msg, void *userdata, sd_bus_error *ret_error) {
+	wlr_log(L_INFO, "SessionRemoved signal received");
+	return 0;
+}
+
+static int pause_device(sd_bus_message *msg, void *userdata, sd_bus_error *ret_error) {
+	wlr_log(L_INFO, "PauseDevice signal received");
+	return 0;
+}
+
+static int resume_device(sd_bus_message *msg, void *userdata, sd_bus_error *ret_error) {
+	wlr_log(L_INFO, "ResumeDevice signal received");
+	return 0;
+}
+
+static bool add_signal_matches(struct logind_session *session) {
+	int ret;
+
+	char str[256];
+	const char *fmt = "type='signal',"
+		"sender='org.freedesktop.login1',"
+		"interface='org.freedesktop.login1.%s',"
+		"member='%s',"
+		"path='%s'";
+
+	snprintf(str, sizeof(str), fmt, "Manager", "SesssionRemoved", "/org/freedesktop/login1");
+	ret = sd_bus_add_match(session->bus, NULL, str, session_removed, session);
+	if (ret < 0) {
+		wlr_log(L_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
+		return false;
+	}
+
+	snprintf(str, sizeof(str), fmt, "Session", "PauseDevice", session->path);
+	ret = sd_bus_add_match(session->bus, NULL, str, pause_device, session);
+	if (ret < 0) {
+		wlr_log(L_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
+		return false;
+	}
+
+	snprintf(str, sizeof(str), fmt, "Session", "ResumeDevice", session->path);
+	ret = sd_bus_add_match(session->bus, NULL, str, resume_device, session);
+	if (ret < 0) {
+		wlr_log(L_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
+		return false;
+	}
+
+	return true;
+}
+
+static int dbus_event(int fd, uint32_t mask, void *data) {
+	sd_bus *bus = data;
+	while (sd_bus_process(bus, NULL) > 0);
+	return 1;
+}
+
+static struct wlr_session *logind_session_start(struct wl_display *disp) {
 	int ret;
 	struct logind_session *session = calloc(1, sizeof(*session));
 	if (!session) {
@@ -183,22 +259,33 @@ static struct wlr_session *logind_session_start(void) {
 	int len = snprintf(NULL, 0, fmt, session->id);
 
 	session->path = malloc(len + 1);
-	if (!session->path)
+	if (!session->path) {
 		goto error;
+	}
 
 	sprintf(session->path, fmt, session->id);
 
 	ret = sd_bus_default_system(&session->bus);
 	if (ret < 0) {
-		wlr_log(L_ERROR, "Failed to open DBus connection: %s", strerror(-ret));
+		wlr_log(L_ERROR, "Failed to open D-Bus connection: %s", strerror(-ret));
 		goto error;
 	}
 
-	if (!session_activate(session))
+	if (!add_signal_matches(session)) {
 		goto error_bus;
+	}
 
-	if (!take_control(session))
+	struct wl_event_loop *event_loop = wl_display_get_event_loop(disp);
+	session->event = wl_event_loop_add_fd(event_loop, sd_bus_get_fd(session->bus),
+		WL_EVENT_READABLE, dbus_event, session->bus);
+
+	if (!session_activate(session)) {
 		goto error_bus;
+	}
+
+	if (!take_control(session)) {
+		goto error_bus;
+	}
 
 	wlr_log(L_INFO, "Successfully loaded logind session");
 
@@ -220,4 +307,5 @@ const struct session_interface session_logind_iface = {
 	.finish = logind_session_finish,
 	.open = logind_take_device,
 	.close = logind_release_device,
+	.change_vt = logind_change_vt,
 };

session/session.c

@@ -13,11 +13,11 @@ static const struct session_interface *ifaces[] = {
 	NULL,
 };
 
-struct wlr_session *wlr_session_start(void) {
+struct wlr_session *wlr_session_start(struct wl_display *disp) {
 	const struct session_interface **iter;
 
 	for (iter = ifaces; *iter; ++iter) {
-		struct wlr_session *session = (*iter)->start();
+		struct wlr_session *session = (*iter)->start(disp);
 		if (session) {
 			return session;
 		}
@@ -40,3 +40,7 @@ int wlr_session_open_file(struct wlr_session *restrict session,
 void wlr_session_close_file(struct wlr_session *session, int fd) {
 	session->iface.close(session, fd);
 }
+
+bool wlr_session_change_vt(struct wlr_session *session, int vt) {
+	return session->iface.change_vt(session, vt);
+}