50 lines
1.2 KiB
JavaScript
50 lines
1.2 KiB
JavaScript
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const runningProcs = new Set()
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let handlersInstalled = false
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// NOTE: these signals aren't actually forwarded anywhere. they're trapped and
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// ignored until all child processes have exited. in our next breaking change
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// we should rename this
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const forwardedSignals = [
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'SIGINT',
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'SIGTERM',
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]
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// no-op, this is so receiving the signal doesn't cause us to exit immediately
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// instead, we exit after all children have exited when we re-send the signal
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// to ourselves. see the catch handler at the bottom of run-script-pkg.js
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// istanbul ignore next - this function does nothing
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const handleSignal = () => {}
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const setupListeners = () => {
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for (const signal of forwardedSignals) {
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process.on(signal, handleSignal)
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}
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handlersInstalled = true
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}
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const cleanupListeners = () => {
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if (runningProcs.size === 0) {
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for (const signal of forwardedSignals) {
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process.removeListener(signal, handleSignal)
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}
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handlersInstalled = false
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}
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}
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const add = proc => {
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runningProcs.add(proc)
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if (!handlersInstalled) {
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setupListeners()
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}
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proc.once('exit', () => {
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runningProcs.delete(proc)
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cleanupListeners()
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})
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}
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module.exports = {
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add,
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handleSignal,
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forwardedSignals,
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}
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