proc

Graceful shutdown and environment variables. proc.shutdown_requested() turns true once the process receives SIGTERM or SIGINT; a blocked net.accept()/net.recv()/net.dial() on the main thread is interrupted the instant the signal arrives (an err result, not a hang), so a listener loop notices without needing select or a timeout. proc.active_tasks() counts currently-running spawned tasks. proc.wait_idle() parks until that count is zero, so a shutting-down program can drain in-flight work without polling.

import "net";
import "proc";
import "time";

fn accept_and_serve(lfd: i32) {
    let ar: result[i32, str] = net.accept(lfd);
    guard let cfd = ar else { return; } // interrupted, or a real error
    spawn serve(cfd);
}

let lr: result[i32, str] = net.listen(8080);
guard let lfd = lr else { exit(1); }

while !proc.shutdown_requested() {
    accept_and_serve(lfd);
}

proc.wait_idle();

proc.getenv(name) reads an environment variable, returning opt[str] (none if unset). proc.args() is the process argument list ([str]); args[0] is the executable path. proc.cwd() is the working directory as result[str, str].

API#