uv-poll

It's like UV_POLL_T but javascript

This is ripped from node serialport internals. It's an event emitter wrapper for libuv's UV_POLL_T struct.

The underlying event stream is continuous so instead of emitting all of them we ask for the next one. This can be done two ways.

• poll.once(event, callback) this automatically calls poll() for the correct event
• poll.poll(eventInt) asks uv_poll_start to poll for these additional events

const fd = fs.openSync('file')
const poll = new Poller(fd)
poll.once('readable', () => console.log(`fd ${fd} is now readable`))
poll.once('writable', () => console.log(`fd ${fd} is now writable`))
poll.once('disconnect', () => console.log(`fd ${fd} is now disconnect`)) // means not readable or writable

This is tested pretty heavily in serialport. Happy to land any any improvements, tests, or fixes.