Yu Watanabe
06ef663ac0
Provides a Tokio-like #[tokio::main] entry point for binaries that want
to run their main function inside a fiber on a default sd_event loop.
DEFINE_MAIN_FUNCTION_FIBER(impl) mirrors DEFINE_MAIN_FUNCTION but routes
impl through a new run_main_fiber() helper, which:
- allocates the default sd_event,
- enables exit-on-idle so the loop terminates once all event sources
drain (structured concurrency: impl is expected to cancel and reap
whatever it spawned before returning),
- spawns impl as a fiber named after program_invocation_short_name,
- installs SIGINT/SIGTERM handlers that cancel the main fiber (and
disable themselves so the loop can go idle once the fiber unwinds),
- runs sd_event_loop and propagates impl's return value via
sd_future_result, normalising -ECANCELED to 0 since that just
represents an orderly signal-driven shutdown.
System and Service Manager
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