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author | ed <ed@FreeBSD.org> | 2008-11-01 08:35:28 +0000 |
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committer | ed <ed@FreeBSD.org> | 2008-11-01 08:35:28 +0000 |
commit | c2c324d37976496417e7195d8daae3975be8eaa1 (patch) | |
tree | 92b387a3b5878c3317cf997130d7bc5769e5f6e5 /usr.sbin/pstat | |
parent | ec4658731c7b03d16de04acf5f20aa4dc53635cb (diff) | |
download | FreeBSD-src-c2c324d37976496417e7195d8daae3975be8eaa1.zip FreeBSD-src-c2c324d37976496417e7195d8daae3975be8eaa1.tar.gz |
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>
Diffstat (limited to 'usr.sbin/pstat')
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