ydotoold: check $DISPLAY env before invoking xinput

Author: ReimuNotMoe

Daemon/ydotoold.c

@@ -356,18 +356,20 @@ int main(int argc, char **argv) {
 
 	const char *xinput_path = "/usr/bin/xinput";
 
-	if (stat(xinput_path, &sbuf) == 0) {
-		pid_t npid = vfork();
-
-		if (npid == 0) {
-			execl(xinput_path, "xinput", "--set-prop", "pointer:ydotoold virtual device", "libinput Accel Profile Enabled", "0,", "1", NULL);
-			perror("failed to run xinput command");
-			_exit(2);
-		} else if (npid == -1) {
-			perror("failed to fork");
+	if (getenv("DISPLAY")) {
+		if (stat(xinput_path, &sbuf) == 0) {
+			pid_t npid = vfork();
+
+			if (npid == 0) {
+				execl(xinput_path, "xinput", "--set-prop", "pointer:ydotoold virtual device", "libinput Accel Profile Enabled", "0,", "1", NULL);
+				perror("failed to run xinput command");
+				_exit(2);
+			} else if (npid == -1) {
+				perror("failed to fork");
+			}
+		} else {
+			printf("xinput command not found in `%s', not disabling mouser pointer acceleration", xinput_path);
 		}
-	} else {
-		printf("xinput command not found in `%s', not disabling mouser pointer acceleration", xinput_path);
 	}
 
 	puts("READY");