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const {
FunctionPrototypeBind,
SafeMap,
} = primordials;
const {
errnoException,
} = require('internal/errors');
const { signals } = internalBinding('constants').os;
let Signal;
const signalWraps = new SafeMap();
function isSignal(event) {
return typeof event === 'string' && signals[event] !== undefined;
}
// Detect presence of a listener for the special signal types
function startListeningIfSignal(type) {
if (isSignal(type) && !signalWraps.has(type)) {
if (Signal === undefined)
Signal = internalBinding('signal_wrap').Signal;
const wrap = new Signal();
wrap.unref();
wrap.onsignal = FunctionPrototypeBind(process.emit, process, type, type);
const signum = signals[type];
const err = wrap.start(signum);
if (err) {
wrap.close();
throw errnoException(err, 'uv_signal_start');
}
signalWraps.set(type, wrap);
}
}
function stopListeningIfSignal(type) {
const wrap = signalWraps.get(type);
if (wrap !== undefined && process.listenerCount(type) === 0) {
wrap.close();
signalWraps.delete(type);
}
}
module.exports = {
startListeningIfSignal,
stopListeningIfSignal
};
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