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- // Note: since nyc uses this module to output coverage, any lines
- // that are in the direct sync flow of nyc's outputCoverage are
- // ignored, since we can never get coverage for them.
- // grab a reference to node's real process object right away
- var process = global.process
-
- const processOk = function (process) {
- return process &&
- typeof process === 'object' &&
- typeof process.removeListener === 'function' &&
- typeof process.emit === 'function' &&
- typeof process.reallyExit === 'function' &&
- typeof process.listeners === 'function' &&
- typeof process.kill === 'function' &&
- typeof process.pid === 'number' &&
- typeof process.on === 'function'
- }
-
- // some kind of non-node environment, just no-op
- /* istanbul ignore if */
- if (!processOk(process)) {
- module.exports = function () {
- return function () {}
- }
- } else {
- var assert = require('assert')
- var signals = require('./signals.js')
- var isWin = /^win/i.test(process.platform)
-
- var EE = require('events')
- /* istanbul ignore if */
- if (typeof EE !== 'function') {
- EE = EE.EventEmitter
- }
-
- var emitter
- if (process.__signal_exit_emitter__) {
- emitter = process.__signal_exit_emitter__
- } else {
- emitter = process.__signal_exit_emitter__ = new EE()
- emitter.count = 0
- emitter.emitted = {}
- }
-
- // Because this emitter is a global, we have to check to see if a
- // previous version of this library failed to enable infinite listeners.
- // I know what you're about to say. But literally everything about
- // signal-exit is a compromise with evil. Get used to it.
- if (!emitter.infinite) {
- emitter.setMaxListeners(Infinity)
- emitter.infinite = true
- }
-
- module.exports = function (cb, opts) {
- /* istanbul ignore if */
- if (!processOk(global.process)) {
- return function () {}
- }
- assert.equal(typeof cb, 'function', 'a callback must be provided for exit handler')
-
- if (loaded === false) {
- load()
- }
-
- var ev = 'exit'
- if (opts && opts.alwaysLast) {
- ev = 'afterexit'
- }
-
- var remove = function () {
- emitter.removeListener(ev, cb)
- if (emitter.listeners('exit').length === 0 &&
- emitter.listeners('afterexit').length === 0) {
- unload()
- }
- }
- emitter.on(ev, cb)
-
- return remove
- }
-
- var unload = function unload () {
- if (!loaded || !processOk(global.process)) {
- return
- }
- loaded = false
-
- signals.forEach(function (sig) {
- try {
- process.removeListener(sig, sigListeners[sig])
- } catch (er) {}
- })
- process.emit = originalProcessEmit
- process.reallyExit = originalProcessReallyExit
- emitter.count -= 1
- }
- module.exports.unload = unload
-
- var emit = function emit (event, code, signal) {
- /* istanbul ignore if */
- if (emitter.emitted[event]) {
- return
- }
- emitter.emitted[event] = true
- emitter.emit(event, code, signal)
- }
-
- // { <signal>: <listener fn>, ... }
- var sigListeners = {}
- signals.forEach(function (sig) {
- sigListeners[sig] = function listener () {
- /* 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)
- }
- }
- }
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