// Note: since nyc uses this module to output coverage, any lines
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// that are in the direct sync flow of nyc's outputCoverage are
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// ignored, since we can never get coverage for them.
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// grab a reference to node's real process object right away
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var process = global.process
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const processOk = function (process) {
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return process &&
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typeof process === 'object' &&
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typeof process.removeListener === 'function' &&
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typeof process.emit === 'function' &&
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typeof process.reallyExit === 'function' &&
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typeof process.listeners === 'function' &&
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typeof process.kill === 'function' &&
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typeof process.pid === 'number' &&
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typeof process.on === 'function'
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}
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// some kind of non-node environment, just no-op
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/* istanbul ignore if */
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if (!processOk(process)) {
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module.exports = function () {
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return function () {}
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}
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} else {
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var assert = require('assert')
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var signals = require('./signals.js')
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var isWin = /^win/i.test(process.platform)
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var EE = require('events')
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/* istanbul ignore if */
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if (typeof EE !== 'function') {
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EE = EE.EventEmitter
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}
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var emitter
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if (process.__signal_exit_emitter__) {
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emitter = process.__signal_exit_emitter__
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} else {
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emitter = process.__signal_exit_emitter__ = new EE()
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emitter.count = 0
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emitter.emitted = {}
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}
|
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// Because this emitter is a global, we have to check to see if a
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// previous version of this library failed to enable infinite listeners.
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// I know what you're about to say. But literally everything about
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// signal-exit is a compromise with evil. Get used to it.
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if (!emitter.infinite) {
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emitter.setMaxListeners(Infinity)
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emitter.infinite = true
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}
|
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module.exports = function (cb, opts) {
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/* istanbul ignore if */
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if (!processOk(global.process)) {
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return function () {}
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}
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assert.equal(typeof cb, 'function', 'a callback must be provided for exit handler')
|
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if (loaded === false) {
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load()
|
}
|
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var ev = 'exit'
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if (opts && opts.alwaysLast) {
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ev = 'afterexit'
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}
|
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var remove = function () {
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emitter.removeListener(ev, cb)
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if (emitter.listeners('exit').length === 0 &&
|
emitter.listeners('afterexit').length === 0) {
|
unload()
|
}
|
}
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emitter.on(ev, cb)
|
|
return remove
|
}
|
|
var unload = function unload () {
|
if (!loaded || !processOk(global.process)) {
|
return
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}
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loaded = false
|
|
signals.forEach(function (sig) {
|
try {
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process.removeListener(sig, sigListeners[sig])
|
} catch (er) {}
|
})
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process.emit = originalProcessEmit
|
process.reallyExit = originalProcessReallyExit
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emitter.count -= 1
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}
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module.exports.unload = unload
|
|
var emit = function emit (event, code, signal) {
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/* istanbul ignore if */
|
if (emitter.emitted[event]) {
|
return
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}
|
emitter.emitted[event] = true
|
emitter.emit(event, code, signal)
|
}
|
|
// { <signal>: <listener fn>, ... }
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var sigListeners = {}
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signals.forEach(function (sig) {
|
sigListeners[sig] = function listener () {
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/* istanbul ignore if */
|
if (!processOk(global.process)) {
|
return
|
}
|
// If there are no other listeners, an exit is coming!
|
// Simplest way: remove us and then re-send the signal.
|
// We know that this will kill the process, so we can
|
// safely emit now.
|
var listeners = process.listeners(sig)
|
if (listeners.length === emitter.count) {
|
unload()
|
emit('exit', null, sig)
|
/* istanbul ignore next */
|
emit('afterexit', null, sig)
|
/* istanbul ignore next */
|
if (isWin && sig === 'SIGHUP') {
|
// "SIGHUP" throws an `ENOSYS` error on Windows,
|
// so use a supported signal instead
|
sig = 'SIGINT'
|
}
|
/* istanbul ignore next */
|
process.kill(process.pid, sig)
|
}
|
}
|
})
|
|
module.exports.signals = function () {
|
return signals
|
}
|
|
var loaded = false
|
|
var load = function load () {
|
if (loaded || !processOk(global.process)) {
|
return
|
}
|
loaded = true
|
|
// This is the number of onSignalExit's that are in play.
|
// It's important so that we can count the correct number of
|
// listeners on signals, and don't wait for the other one to
|
// handle it instead of us.
|
emitter.count += 1
|
|
signals = signals.filter(function (sig) {
|
try {
|
process.on(sig, sigListeners[sig])
|
return true
|
} catch (er) {
|
return false
|
}
|
})
|
|
process.emit = processEmit
|
process.reallyExit = processReallyExit
|
}
|
module.exports.load = load
|
|
var originalProcessReallyExit = process.reallyExit
|
var processReallyExit = function processReallyExit (code) {
|
/* istanbul ignore if */
|
if (!processOk(global.process)) {
|
return
|
}
|
process.exitCode = code || /* istanbul ignore next */ 0
|
emit('exit', process.exitCode, null)
|
/* istanbul ignore next */
|
emit('afterexit', process.exitCode, null)
|
/* istanbul ignore next */
|
originalProcessReallyExit.call(process, process.exitCode)
|
}
|
|
var originalProcessEmit = process.emit
|
var processEmit = function processEmit (ev, arg) {
|
if (ev === 'exit' && processOk(global.process)) {
|
/* istanbul ignore else */
|
if (arg !== undefined) {
|
process.exitCode = arg
|
}
|
var ret = originalProcessEmit.apply(this, arguments)
|
/* istanbul ignore next */
|
emit('exit', process.exitCode, null)
|
/* istanbul ignore next */
|
emit('afterexit', process.exitCode, null)
|
/* istanbul ignore next */
|
return ret
|
} else {
|
return originalProcessEmit.apply(this, arguments)
|
}
|
}
|
}
|
