SetReadDeadline is invalid for pty read, it will block

[creack]

Would you have more details? context? way to reproduce?

[itmisx]

eg

ptmx.SetReadDeadline(time.Now().Add(time.Second))
ptmx.Read(buf)

i set the read deadline one second, but if there is no new msg, the read will always block

[creack]

On what go version, what os/arch?

[creack]

Note that v1.1.21 reverted the non-block behavior introduced by #167, all os are now blocking, which mean SetReadDeadline will not work.

• On windows, non-block is not supported for the console.
• On OSX, non-block causes the read to use 100% CPU.
• On Linux, non-block causes races resulting in random silent failures of ioctl, read and write.

While there is nothing we can do about windows, if you believe it is really important, maybe we could add an optional flag or a different public method to use non-block on OSX and Linux.

Closing for now as it is an expected behavior.