hvc_console: Escape magic sysrq key

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The ctrl-o (^O) is a common control key used by several applications,
such as vim, but hvc_console uses ^O as the magic-sysrq key.  This
commit allows users to send ^O to applications by pressing ^O twice
in succession.

To implement this, this commit introduces a check if ^O is pressed
again if the sysrq_pressed variable is already set.  In this case,
clear sysrq_pressed state and flip the ^O character to the tty.  (The
old behavior has always set "sysrq_pressed" if ^O has been entered,
and it has not flipped the ^O character to the tty.)

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

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This commit is contained in:

Hendrik Brueckner 2008-12-16 00:09:38 +00:00 • committed by Paul Mackerras

parent 532774ec7f

commit 368c1e3249

1 changed files with 5 additions and 2 deletions

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drivers/char/hvc_console.c

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