function main returns exit status

bin/src/main.rs

@@ -71,10 +71,18 @@ enum MainError {
  BeginNewMain(UpgradeError),
  #[error("{0}")]
  Cli(CtlError),
+ #[error("paw io error: {0}")]
+ Io(std::io::Error),
+}
+
+impl From<std::io::Error> for MainError {
+ fn from(value: std::io::Error) -> Self {
+ Self::Io(value)
+ }
 }
 
 #[paw::main]
-fn main(args: Args) {
+fn main(args: Args) -> Result<(), MainError> {
  register_panic_hook();
 
  let result = match args.cmd {
@@ -119,10 +127,11 @@ fn main(args: Args) {
  }
  _ => ctl::ctl(args).map_err(MainError::Cli),
  };
- match result {
-  Ok(_) => {}
- Err(main_error) => println!("{}", main_error),
+
+ if let Err(main_error) = &result {
+ eprintln!("\n{main_error}\n");
  }
+ result
 }
 
 /// Set workers process affinity, see man sched_setaffinity