Date: Sat, 1 Nov 2008 08:35:28 +0000 (UTC) From: Ed Schouten <ed@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/conf files src/sys/kern kern_cons.c tty.c tty_cons.c src/sys/sys tty.h Message-ID: <200811010836.mA18adPZ004913@repoman.freebsd.org>
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ed 2008-11-01 08:35:28 UTC
FreeBSD src repository
Modified files:
sys/conf files
sys/kern tty.c
sys/sys tty.h
Added files:
sys/kern kern_cons.c
Removed files:
sys/kern tty_cons.c
Log:
SVN rev 184521 on 2008-11-01 08:35:28Z by ed
Reimplement the /dev/console device node.
One of the pieces of code that I had left alone during the development
of the MPSAFE TTY layer, was tty_cons.c. This file actually has two
different functions:
- It contains low-level console input/output routines (cnputc(), etc).
- It creates /dev/console and wraps all its cdevsw calls to the
appropriate TTY.
This commit reimplements the second set of functions by moving it
directly into the TTY layer. /dev/console is now a character device node
that's basically a regular TTY, but does a lookup of `si_drv1' each time
you open it. d_write has also been changed to call log_console().
d_close() is not present, because we must make sure we don't revoke the
TTY after writing a log message to it.
Even though I'm not convinced this is in line with the future directions
of our console code, it is a good move for now. It removes recursive
locking from the top half of the TTY layer. The previous implementation
called into the TTY layer with Giant held.
I'm renaming tty_cons.c to kern_cons.c now. The code hardly contains any
TTY related bits, so we'd better give it a less misleading name.
Tested by: Andrzej Tobola <ato iem pw edu pl>,
Carlos A.M. dos Santos <unixmania gmail com>,
Eygene Ryabinkin <rea-fbsd codelabs ru>
Revision Changes Path
1.1344 +1 -1 src/sys/conf/files
1.1 +566 -0 src/sys/kern/kern_cons.c (new)
1.296 +87 -9 src/sys/kern/tty.c
1.146 +0 -796 src/sys/kern/tty_cons.c (dead)
1.111 +3 -0 src/sys/sys/tty.h
help
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