From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Mon,  7 Dec 2009 12:10:50 -0500
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From: Eoghan Sherry <ejsherry@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] keyboard events in sam
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The keyboard is handled in src/cmd/devdraw which could be considered
the plan9port
equivalent of the Plan 9 kernel (at least the keyboard, mouse, and
graphics part).

The X11 version of devdraw maps the X notion of a keyboard to the Plan 9 one in
__xtoplan9kbd (src/cmd/devdraw/x11-itrans.c).
In particular, this function contains,

        /* Do control mapping ourselves if translator doesn't */
        if(e->xkey.state&ControlMask && k != Kalt)
                k &= 0x9f;

So, for instance, Ctrl-[0Pp] all map to 0x10.

Not sure what the convention should be, but that's where it's enforced.

Eoghan