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-rw-r--r--node_modules/signal-exit/index.js157
1 files changed, 157 insertions, 0 deletions
diff --git a/node_modules/signal-exit/index.js b/node_modules/signal-exit/index.js
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index 0000000..337f691
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+++ b/node_modules/signal-exit/index.js
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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.
+var assert = require('assert')
+var signals = require('./signals.js')
+
+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) {
+ 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
+}
+
+module.exports.unload = unload
+function unload () {
+ if (!loaded) {
+ return
+ }
+ loaded = false
+
+ signals.forEach(function (sig) {
+ try {
+ process.removeListener(sig, sigListeners[sig])
+ } catch (er) {}
+ })
+ process.emit = originalProcessEmit
+ process.reallyExit = originalProcessReallyExit
+ emitter.count -= 1
+}
+
+function emit (event, code, signal) {
+ 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 () {
+ // 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 */
+ process.kill(process.pid, sig)
+ }
+ }
+})
+
+module.exports.signals = function () {
+ return signals
+}
+
+module.exports.load = load
+
+var loaded = false
+
+function load () {
+ if (loaded) {
+ 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
+}
+
+var originalProcessReallyExit = process.reallyExit
+function processReallyExit (code) {
+ process.exitCode = code || 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
+function processEmit (ev, arg) {
+ if (ev === 'exit') {
+ if (arg !== undefined) {
+ process.exitCode = arg
+ }
+ var ret = originalProcessEmit.apply(this, arguments)
+ emit('exit', process.exitCode, null)
+ /* istanbul ignore next */
+ emit('afterexit', process.exitCode, null)
+ return ret
+ } else {
+ return originalProcessEmit.apply(this, arguments)
+ }
+}