🥅 Clean exit if XOpenDisplay fails

src/aswm/aswm.c

@@ -17,14 +17,20 @@
 Aswm _aswm;
 
 void aswm_open(const char* zlog_conf) {
+	atexit(aswm_close);
+
 	set_up_logger(zlog_conf);
 
+	XSetErrorHandler(aswm_error_handler);
+
 	_aswm.display = XOpenDisplay(NULL);
 	_aswm.desktops = malloc(0);
 	_aswm.desktops_count = 0;
 
-	XSetErrorHandler(aswm_error_handler);
+	if(_aswm.display == NULL) {
-
+		aswm_error("Cannot open X Display. Check the DISPLAY environement variable, and ensure an X server is running for the corresponding DISPLAY.");
+		exit(1);
+	}
 	Window x_root_window = DefaultRootWindow(_aswm.display);
 	XWindowAttributes x_root_attributes;
 	XGetWindowAttributes(_aswm.display, x_root_window, &x_root_attributes);
@@ -50,8 +56,6 @@ void aswm_open(const char* zlog_conf) {
 	aswm_debug("ASWM Root window %lu", _aswm.root_window);
 
 	aswm_log_tree(aswm_debug, &_aswm, DefaultRootWindow(_aswm.display), 1);
-
-	atexit(aswm_close);
 }
 
 void aswm_create_workspace() {
@@ -153,7 +157,8 @@ void aswm_event_loop() {
 void aswm_close() {
 	free(_aswm.desktops);
 	tear_down_logger();
-	XCloseDisplay(_aswm.display);
+	if(_aswm.display != NULL)
+		XCloseDisplay(_aswm.display);
 }
 
 Window aswm_currently_active() {

test/test_set_up.c

@@ -34,7 +34,7 @@ void set_up_test_logger(void) {
 		printf("Init test zlog failed\n");
 	}
 
-	test_log = zlog_get_category("test_log");
+	test_log = zlog_get_category("test");
 	if (!test_log) {
 		printf("Get zlog test_log category failed\n");
 	}