Create socket in /var/run/user/${HOME}

Use the runtime dir from XDG Base Directory Specification for creating the
socket in a directory only the user can read and write.

clients/dnd.c

@@ -37,8 +37,6 @@
 
 #include "window.h"
 
-static const char socket_name[] = "\0wayland";
-
 struct dnd {
 	struct window *window;
 	struct display *display;

clients/image.c

@@ -38,9 +38,6 @@
 
 #include "window.h"
 
-static const char gem_device[] = "/dev/dri/card0";
-static const char socket_name[] = "\0wayland";
-
 struct image {
 	struct window *window;
 	struct display *display;

clients/screenshot.c

@@ -35,8 +35,6 @@
  * the compositor and serves as a test bed for implementing client
  * side marshalling outside libwayland.so */
 
-static const char socket_name[] = "\0wayland";
-
 static void
 handle_global(struct wl_display *display, uint32_t id,
 	      const char *interface, uint32_t version, void *data)
@@ -54,7 +52,7 @@ int main(int argc, char *argv[])
 	GSource *source;
 	struct wl_screenshooter *screenshooter;
 
-	display = wl_display_connect(socket_name, sizeof socket_name);
+	display = wl_display_connect(NULL);
 	if (display == NULL) {
 		fprintf(stderr, "failed to create display: %m\n");
 		return -1;

clients/view.c

@@ -42,9 +42,6 @@
 
 #include "window.h"
 
-static const char gem_device[] = "/dev/dri/card0";
-static const char socket_name[] = "\0wayland";
-
 struct view {
 	struct window *window;
 	struct display *display;

clients/window.c

@@ -1337,8 +1337,6 @@ display_handle_global(struct wl_display *display, uint32_t id,
 	}
 }
 
-static const char socket_name[] = "\0wayland";
-
 static void
 display_render_frame(struct display *d)
 {
@@ -1425,7 +1423,7 @@ display_create(int *argc, char **argv[], const GOptionEntry *option_entries)
 	if (d == NULL)
 		return NULL;
 
-	d->display = wl_display_connect(socket_name, sizeof socket_name);
+	d->display = wl_display_connect(NULL);
 	if (d->display == NULL) {
 		fprintf(stderr, "failed to create display: %m\n");
 		return NULL;

compositor/compositor-wayland.c

@@ -513,8 +513,6 @@ wayland_compositor_create(struct wl_display *display, int width, int height)
 	struct wayland_compositor *c;
 	struct wl_event_loop *loop;
 	int fd;
-	char *socket_name, *env;
-	int socket_name_size;
 
 	c = malloc(sizeof *c);
 	if (c == NULL)
@@ -522,11 +520,7 @@ wayland_compositor_create(struct wl_display *display, int width, int height)
 
 	memset(c, 0, sizeof *c);
 
-	env = getenv("WAYLAND_DISPLAY");
-	socket_name_size = asprintf(&socket_name, "%c%s", '\0', env) + 1;
-
-	c->parent.display = wl_display_connect(socket_name, socket_name_size);
-	free(socket_name);
+	c->parent.display = wl_display_connect(NULL);
 
 	if (c->parent.display == NULL) {
 		fprintf(stderr, "failed to create display: %m\n");

compositor/compositor.c

@@ -37,8 +37,7 @@
 /* The plan here is to generate a random anonymous socket name and
  * advertise that through a service on the session dbus.
  */
-static const char *option_socket_name = "wayland";
-
+static const char *option_socket_name = NULL;
 static const char *option_background = "background.jpg";
 static const char *option_geometry = "1024x640";
 static int option_connector = 0;
@@ -901,7 +900,7 @@ notify_key(struct wlsc_input_device *device,
 
 	switch (key | device->modifier_state) {
 	case KEY_BACKSPACE | MODIFIER_CTRL | MODIFIER_ALT:
-		kill(0, SIGTERM);
+		wl_display_terminate(device->ec->wl_display);
 		return;
 	}
 
@@ -1396,7 +1395,6 @@ wlsc_compositor_init(struct wlsc_compositor *ec, struct wl_display *display)
 	return 0;
 }
 
-
 int main(int argc, char *argv[])
 {
 	struct wl_display *display;
@@ -1404,8 +1402,6 @@ int main(int argc, char *argv[])
 	GError *error = NULL;
 	GOptionContext *context;
 	int width, height;
-	char *socket_name;
-	int socket_name_size;
 
 	g_type_init(); /* GdkPixbuf needs this, it seems. */
 
@@ -1435,16 +1431,14 @@ int main(int argc, char *argv[])
 		exit(EXIT_FAILURE);
 	}
 
-	socket_name_size =
-		asprintf(&socket_name, "%c%s", '\0', option_socket_name) + 1;
-
-	if (wl_display_add_socket(display, socket_name, socket_name_size)) {
+	if (wl_display_add_socket(display, option_socket_name)) {
 		fprintf(stderr, "failed to add socket: %m\n");
 		exit(EXIT_FAILURE);
 	}
-	free(socket_name);
 
 	wl_display_run(display);
 
+	wl_display_destroy(display);
+
 	return 0;
 }

wayland/wayland-client.c

@@ -38,8 +38,6 @@
 #include "wayland-util.h"
 #include "wayland-client.h"
 
-static const char socket_name[] = "\0wayland";
-
 struct wl_global_listener {
 	wl_display_global_func_t handler;
 	void *data;
@@ -330,11 +328,13 @@ static const struct wl_display_listener display_listener = {
 };
 
 WL_EXPORT struct wl_display *
-wl_display_connect(const char *name, size_t name_size)
+wl_display_connect(const char *name)
 {
 	struct wl_display *display;
 	struct sockaddr_un addr;
 	socklen_t size;
+	const char *runtime_dir;
+	size_t name_size;
 
 	display = malloc(sizeof *display);
 	if (display == NULL)
@@ -347,8 +347,24 @@ wl_display_connect(const char *name, size_t name_size)
 		return NULL;
 	}
 
+	runtime_dir = getenv("XDG_RUNTIME_DIR");
+	if (runtime_dir == NULL) {
+		runtime_dir = ".";
+		fprintf(stderr,
+			"XDG_RUNTIME_DIR not set, falling back to %s\n",
+			runtime_dir);
+	}
+
+	if (name == NULL)
+		name = getenv("WAYLAND_DISPLAY");
+	if (name == NULL)
+		name = "wayland-0";
+
+	memset(&addr, 0, sizeof addr);
 	addr.sun_family = AF_LOCAL;
-	memcpy(addr.sun_path, name, name_size);
+	name_size =
+		snprintf(addr.sun_path, sizeof addr.sun_path,
+			 "%s/%s", runtime_dir, name) + 1;
 
 	size = offsetof (struct sockaddr_un, sun_path) + name_size;
 

wayland/wayland-client.h

@@ -37,7 +37,7 @@ typedef int (*wl_display_update_func_t)(uint32_t mask, void *data);
 typedef void (*wl_display_sync_func_t)(void *data);
 typedef void (*wl_display_frame_func_t)(void *data, uint32_t time);
 
-struct wl_display *wl_display_connect(const char *name, size_t name_size);
+struct wl_display *wl_display_connect(const char *name);
 void wl_display_destroy(struct wl_display *display);
 int wl_display_get_fd(struct wl_display *display,
 		      wl_display_update_func_t update, void *data);

wayland/wayland-server.c

@@ -38,6 +38,12 @@
 #include "wayland-server-protocol.h"
 #include "connection.h"
 
+struct wl_socket {
+	int fd;
+	struct sockaddr_un addr;
+	struct wl_list link;
+};
+
 struct wl_client {
 	struct wl_connection *connection;
 	struct wl_event_source *source;
@@ -50,12 +56,14 @@ struct wl_display {
 	struct wl_object base;
 	struct wl_event_loop *loop;
 	struct wl_hash_table *objects;
+	int run;
 
 	struct wl_list frame_list;
 	uint32_t client_id_range;
 	uint32_t id;
 
 	struct wl_list global_list;
+	struct wl_list socket_list;
 };
 
 struct wl_frame_listener {
@@ -425,6 +433,7 @@ wl_display_create(void)
 
 	wl_list_init(&display->frame_list);
 	wl_list_init(&display->global_list);
+	wl_list_init(&display->socket_list);
 
 	display->client_id_range = 256; /* Gah, arbitrary... */
 
@@ -441,6 +450,23 @@ wl_display_create(void)
 	return display;
 }
 
+WL_EXPORT void
+wl_display_destroy(struct wl_display *display)
+{
+	struct wl_socket *s, *next;
+
+	wl_event_loop_destroy(display->loop);
+	wl_hash_table_destroy(display->objects);
+	
+	wl_list_for_each_safe(s, next, &display->socket_list, link) {
+		close(s->fd);
+		unlink(s->addr.sun_path);
+		free(s);
+	}
+
+	free(display);
+}
+
 WL_EXPORT void
 wl_display_add_object(struct wl_display *display, struct wl_object *object)
 {
@@ -483,10 +509,18 @@ wl_display_get_event_loop(struct wl_display *display)
 	return display->loop;
 }
 
+WL_EXPORT void
+wl_display_terminate(struct wl_display *display)
+{
+	display->run = 0;
+}
+
 WL_EXPORT void
 wl_display_run(struct wl_display *display)
 {
-	while (1)
+	display->run = 1;
+
+	while (display->run)
 		wl_event_loop_dispatch(display->loop, -1);
 }
 
@@ -507,30 +541,50 @@ socket_data(int fd, uint32_t mask, void *data)
 }
 
 WL_EXPORT int
-wl_display_add_socket(struct wl_display *display,
-		      const char *name, size_t name_size)
+wl_display_add_socket(struct wl_display *display, const char *name)
 {
-	struct sockaddr_un addr;
-	int sock;
-	socklen_t size;
+	struct wl_socket *s;
+	socklen_t size, name_size;
+	const char *runtime_dir;
+
+	s = malloc(sizeof *s);
+	if (socket == NULL)
+		return -1;
 
-	sock = socket(PF_LOCAL, SOCK_STREAM, 0);
-	if (sock < 0)
+	s->fd = socket(PF_LOCAL, SOCK_STREAM, 0);
+	if (s->fd < 0)
 		return -1;
 
-	addr.sun_family = AF_LOCAL;
-	memcpy(addr.sun_path, name, name_size);
+	runtime_dir = getenv("XDG_RUNTIME_DIR");
+	if (runtime_dir == NULL) {
+		runtime_dir = ".";
+		fprintf(stderr,
+			"XDG_RUNTIME_DIR not set, falling back to %s\n",
+			runtime_dir);
+	}
+
+	if (name == NULL)
+		name = getenv("WAYLAND_DISPLAY");
+	if (name == NULL)
+		name = "wayland-0";
+
+	memset(&s->addr, 0, sizeof s->addr);
+	s->addr.sun_family = AF_LOCAL;
+	name_size = snprintf(s->addr.sun_path, sizeof s->addr.sun_path,
+			     "%s/%s", runtime_dir, name) + 1;
+	fprintf(stderr, "using socket %s\n", s->addr.sun_path);
 
 	size = offsetof (struct sockaddr_un, sun_path) + name_size;
-	if (bind(sock, (struct sockaddr *) &addr, size) < 0)
+	if (bind(s->fd, (struct sockaddr *) &s->addr, size) < 0)
 		return -1;
 
-	if (listen(sock, 1) < 0)
+	if (listen(s->fd, 1) < 0)
 		return -1;
 
-	wl_event_loop_add_fd(display->loop, sock,
+	wl_event_loop_add_fd(display->loop, s->fd,
 			     WL_EVENT_READABLE,
 			     socket_data, display);
+	wl_list_insert(display->socket_list.prev, &s->link);
 
 	return 0;
 }

wayland/wayland-server.h

@@ -81,8 +81,10 @@ struct wl_display;
 struct wl_input_device;
 
 struct wl_display *wl_display_create(void);
+void wl_display_destroy(struct wl_display *display);
 struct wl_event_loop *wl_display_get_event_loop(struct wl_display *display);
-int wl_display_add_socket(struct wl_display *display, const char *name, size_t name_size);
+int wl_display_add_socket(struct wl_display *display, const char *name);
+void wl_display_terminate(struct wl_display *display);
 void wl_display_run(struct wl_display *display);
 
 void wl_display_add_object(struct wl_display *display, struct wl_object *object);