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os: OpenFile issue on darwin: 100% CPU on pty master read #22099
os.OpenFile calls os.newFile with
On darwin, open
My guess is that having the slave in non-blocking mode is the reason why read on the master takes 100% CPU.
Details of the issue: kr/pty#52
Is it expected always set the poller when using os.OpenFile? Maybe we should take a look at the flags and see if there is O_NONBLOCK instead of forcing it or maybe introduce a new flag to toggle the poller?
To reproduce on darwin: https://play.golang.org/p/rq8pJGL3ey
On Darwin we use the poller when the operating system permits us to use
The workaround of using