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// this spawns a child process that listens for SIGHUP when the
// parent process exits, and after 200ms, sends a SIGKILL to the
// child, in case it did not terminate.
import { spawn } from 'child_process';
const watchdogCode = String.raw `
const pid = parseInt(process.argv[1], 10)
process.title = 'node (foreground-child watchdog pid=' + pid + ')'
if (!isNaN(pid)) {
let barked = false
// keepalive
const interval = setInterval(() => {}, 60000)
const bark = () => {
clearInterval(interval)
if (barked) return
barked = true
process.removeListener('SIGHUP', bark)
setTimeout(() => {
try {
process.kill(pid, 'SIGKILL')
setTimeout(() => process.exit(), 200)
} catch (_) {}
}, 500)
})
process.on('SIGHUP', bark)
}
`;
/**
* Pass in a ChildProcess, and this will spawn a watchdog process that
* will make sure it exits if the parent does, thus preventing any
* dangling detached zombie processes.
*
* If the child ends before the parent, then the watchdog will terminate.
*/
export const watchdog = (child) => {
let dogExited = false;
const dog = spawn(process.execPath, ['-e', watchdogCode, String(child.pid)], {
stdio: 'ignore',
});
dog.on('exit', () => (dogExited = true));
child.on('exit', () => {
if (!dogExited)
dog.kill('SIGKILL');
});
return dog;
};
//# sourceMappingURL=watchdog.js.map