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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 16444x 16444x 16444x 22x 22x 16444x 16444x 163x 163x 163x 163x 163x 163x 163x 163x 163x 163x 163x 163x 163x 163x 16444x 22x 543x 543x 543x 38x 38x 38x 543x 22x 22x 22x 22x 22x | 'use strict'; 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 }; |