Re: proposed change to getty

[Robert Elz <kre%munnari.OZ.AU@localhost>]

    Date:        Mon, 11 Oct 2021 18:09:23 -0300 (ADT)
    From:        Jared McNeill <jmcneill%invisible.ca@localhost>
    Message-ID:  <5ab793c9-8cab-2e79-e6ba-8017d924bdc2%invisible.ca@localhost>

  | There's a 2 second sleep in getty before opening the tty
  | that has been there since before NetBSD

I don't recall if that was there when this
version of getty was created or not -- probably,
in which case it was probably also in the 7th
edition getty.   That all got done about 40
years ago, far too long to remember.

2 secs back then was the smallest sleep that
was guaranteed to be > 0 (the delay for sleep(n)
was between n-1 and n secs).  Since that is
no longer true, the smallest change that should
happen is s/2/1/, or use usleep() or nanosleep()
and make the delay even smaller, 200ms should
be enough for any modem.

Doing it in the driver is OK as well, but
probably needs to remain in getty until we are
sure that all drivers do this correctly.
Since you are handling this by blocking open
until long enough after the close had passed,
also delaying the open in getty should have
no real effect.

kre