Die if uinput module is neither loaded nor built into the kernel

readme.md

@@ -130,7 +130,7 @@ i↑ ⟶ up↑
 rightalt↑ ⟶ ∅
 ```
 
-Load uinput module (**kbct will not function but will not produce an error if the uinput module is not loaded**)
+Load uinput module
 
 ```bash
 sudo modprobe uinput

src/main.rs

@@ -267,7 +267,32 @@ impl EventObserver for KeyLogger {
 	}
 }
 
+fn check_uinput_loaded() -> bool {
+	let mut kernel_version = std::fs::read_to_string("/proc/version").unwrap();
+	kernel_version = kernel_version.to_string().split(' ').nth(2).unwrap().to_string();
+
+	let built_in_modules = std::fs::read_to_string(String::from("/lib/modules/") + &kernel_version + &String::from("/modules.builtin")).unwrap();
+	for line in built_in_modules.lines() {
+		if line.eq("kernel/drivers/input/misc/uinput.ko") {
+			info!("'uinput' is built into running kernel version: {}", kernel_version);
+			return true;
+		}
+	}
+
+	let modules = std::fs::read_to_string("/proc/modules").unwrap();
+	for line in modules.lines() {
+		if line.starts_with("uinput ") {
+			info!("'uinput' module is loaded");
+			return true;
+		}
+	}
+	return false;
+}
+
 fn start_mapper_from_file_conf(config_file: String) -> Result<()> {
+	if !check_uinput_loaded() {
+		panic!("'uinput' module must be loaded OR built into the kernel");
+	}
 	let config = serde_yaml::from_str(
 		&*std::fs::read_to_string(config_file.as_str())
 			.expect(&format!("Could not open file {}", config_file)))