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