Enum StartupAction 

pub enum StartupAction {
    Proceed,
    ExitAlreadyRunning,
    Fail(String),
}

What the daemon startup should do after the single-instance check.

Why: separating the decision from the I/O lets us unit-test the logic with injected probe results rather than spinning up real TCP listeners. What: three variants covering the full decision tree. Test: startup_action_from_probe_result_* tests in this module.

Variants

Proceed

Proceed to bind the socket and start serving.

ExitAlreadyRunning

Another healthy instance is already running — exit 0 cleanly so launchd does not respawn.

Fail(String)

A probe attempt failed with an unexpected error — propagate as a startup failure so the operator sees a real error in the launchd log. Launchd respawns, correctly, because this is a genuine failure.

Nothing constructs this today: socket_is_serving answers a bool, so every failure it can have is “nothing is serving”. The variant stays because the caller in main.rs branches on it and a future probe that can distinguish a permission error from an absence has somewhere to report it.

Trait Implementations

impl Clone for StartupAction

fn clone(&self) -> StartupAction

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for StartupAction

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for StartupAction

impl PartialEq for StartupAction

fn eq(&self, other: &StartupAction) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for StartupAction