htytus@shell1.iglou.com (Hul Tytus) writes:

> comp.os.minix
> finding number of characters in keyboard buffer?
>
> What's a convenient way to find the number of characters in the keyboard
> buffer?

I'm convinced there is none: Only the tty driver knows about those
(it's not a keyboard buffer, but quite probably a buffer in the tty
driver) and AFAIK he doesn't give the information to other processes
(no interface for that). You could implement a new ioctl in the tty
driver, though ...

Regards -- Markus

Markus - I'd come to the same conclusion, although hoping to avoid writing more
code at the same time.

Hul


M E Leypold wrote:

> htytus@shell1.iglou.com (Hul Tytus) writes:

> > comp.os.minix
> > finding number of characters in keyboard buffer?
> >
> > What's a convenient way to find the number of characters in the keyboard
> > buffer?

> I'm convinced there is none: Only the tty driver knows about those
> (it's not a keyboard buffer, but quite probably a buffer in the tty
> driver) and AFAIK he doesn't give the information to other processes
> (no interface for that). You could implement a new ioctl in the tty
> driver, though ...

> Regards -- Markus

Hul Tytus wrote:
> comp.os.minix
> finding number of characters in keyboard buffer?
>
> What's a convenient way to find the number of characters in the keyboard
> buffer?
>
> Hul
It would be best to just real all the data from the keyboard (or
standard input, whichever), and manage the data from a buffer from
within your program. This is the most portable (and thus best) approach
to this task.


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How do you avoid getting lost in a getchar() type function when there is
nothing left in the keyboard buffer? Stated differently, what function
will report when the buffer is empty?

I tried using read("fd for /dev/tty", c, 1) but there was echoing and a
confusion visable on the screen that required rebooting. Possibly
setttyattributes(roughly) could be used for allowing read() access?

Hul

Segin wrote:
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> Hul Tytus wrote:
> > comp.os.minix
> > finding number of characters in keyboard buffer?
> >
> > What's a convenient way to find the number of characters in the keyboard
> > buffer?
> >
> > Hul
> It would be best to just real all the data from the keyboard (or
> standard input, whichever), and manage the data from a buffer from
> within your program. This is the most portable (and thus best) approach
> to this task.


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