Date: Sun, 26 Jan 1997 20:59:33 +1100 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, dgy@rtd.com Cc: freebsd-hackers@freefall.freebsd.org Subject: Re: suggestion for kernel printk() ? Message-ID: <199701260959.UAA25500@godzilla.zeta.org.au>
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>> Yes, it would steal characters from the foreground console unless the >> keyboard is dedicated to low-level console input. > >I guess a single character pushback isn't supported at that level? >--don Right. The low level console driver is very primitive. It does no buffering. Doing anything in it would have reentrancy problems, since it may be called from interrupt handlers. BTW, there _are_ reentrancy problems in the syscons and pcvt output routines. Don't use /dev/ttyv0 in syscons if you want the system to stay up forever. Bruce
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