| 1 | const onlisten = require('on-net-listen')
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| 2 | const fs = require('fs')
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| 3 | const net = require('net')
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| 4 |
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| 5 | onlisten(function (addr) {
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| 6 | this.destroy()
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| 7 | const port = Buffer.from(addr.port + '')
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| 8 | fs.writeSync(3, port, 0, port.length)
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| 9 | signal(3, function () {
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| 10 | process.emit('beforeExit')
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| 11 | })
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| 12 | })
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| 13 |
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| 14 | function signal (fd, cb) {
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| 15 | const s = new net.Socket({ fd, readable: true, writable: false })
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| 16 | s.unref()
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| 17 | s.on('error', () => {})
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| 18 | s.on('close', cb)
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| 19 | }
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