swaybar: Fix 100% cpu usage if dbus dies.

Currently, swaybar does not gracefully die if it detects
that the dbus connection was lost. Although it's not recommended
to restart dbus without restarting the compositor, it can very
easily happen. In the case it does, compositor's tray should
not consume 100% cpu until it has to be force killed.

apply suggestions

just setting the bar to not running will call teardown and unref the
dbus.

swaybar/bar.c

@@ -508,7 +508,7 @@ void bar_run(struct swaybar *bar) {
 	}
 #if HAVE_TRAY
 	if (bar->tray) {
-		loop_add_fd(bar->eventloop, bar->tray->fd, POLLIN, tray_in, bar->tray->bus);
+		loop_add_fd(bar->eventloop, bar->tray->fd, POLLIN, tray_in, bar);
 	}
 #endif
 	while (bar->running) {

swaybar/ipc.c

@@ -518,8 +518,7 @@ static bool handle_barconfig_update(struct swaybar *bar, const char *payload,
 #if HAVE_TRAY
 	if (oldcfg->tray_hidden && !newcfg->tray_hidden) {
 		bar->tray = create_tray(bar);
-		loop_add_fd(bar->eventloop, bar->tray->fd, POLLIN, tray_in,
-				bar->tray->bus);
+		loop_add_fd(bar->eventloop, bar->tray->fd, POLLIN, tray_in, bar);
 	} else if (bar->tray && newcfg->tray_hidden) {
 		loop_remove_fd(bar->eventloop, bar->tray->fd);
 		destroy_tray(bar->tray);

swaybar/tray/tray.c

@@ -1,4 +1,5 @@
 #include <cairo.h>
+#include <poll.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
@@ -90,9 +91,16 @@ void destroy_tray(struct swaybar_tray *tray) {
 }
 
 void tray_in(int fd, short mask, void *data) {
-	sd_bus *bus = data;
+	struct swaybar *bar = data;
 	int ret;
-	while ((ret = sd_bus_process(bus, NULL)) > 0) {
+
+	if (mask & (POLLHUP | POLLERR)) {
+        sway_log(SWAY_ERROR, "D-Bus connection closed unexpectedly");
+		bar->running = false;
+		return;
+    }
+
+	while ((ret = sd_bus_process(bar->tray->bus, NULL)) > 0) {
 		// This space intentionally left blank
 	}
 	if (ret < 0) {