In article <ann5s4$87a$1@ncc1701.cistron.net>,
Miquel van Smoorenburg <miquels@cistron.nl> wrote:
>So you need to know what the _real_ console is so you can write
>a copy to the real console. The only way to find that out is
>to call TIOCGDEV on /dev/console, then scan /dev. That is
>what bootlogd does, I've tried to get TIOCGDEV in the kernel
>since 2.2 days but gave up because it was ignored. So bootlogd
>has always been 'experimental', though it is very useful,
>since it has no kernel support.
>
>Now, to solve this particular problem, there are a few
>alternatives.
>
>One is a TIOCCONS_COPY ioctl, so that output is not redirected
>but copied to the pty.
>
>Another, perhaps more elegant solution is that writes
>to the pty slave that receives the console output should
>go to the real console. A swap instead of a redirect.
That doesn't work since other OSes redirect both input and
output, and while we don't do that we don't want to change
semantics too much.
How about _not_ doing the redirect for filehandles opened
with O_DIRECT ?
--- linux-2.4.19/drivers/char/tty_io.c.orig Sat Aug 3 02:39:43 2002
+++ linux-2.4.19/drivers/char/tty_io.c Wed Oct 9 20:01:26 2002
@@ -755,7 +755,7 @@
is_console = (inode->i_rdev == SYSCONS_DEV ||
inode->i_rdev == CONSOLE_DEV);
- if (is_console && redirect)
+ if (is_console && redirect && !(file->f_flags & O_DIRECT))
tty = redirect;
else
tty = (struct tty_struct *)file->private_data;
Mike.
-
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This archive was generated by hypermail 2b29 : Tue Oct 15 2002 - 22:00:32 EST