Messages in this thread | | | Date | Fri, 27 Feb 1998 14:15:52 -0500 | From | "Theodore Y. Ts'o" <> | Subject | Re: GGI, EGCS/PGCC, Kernel source |
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From: alan@lxorguk.ukuu.org.uk (Alan Cox) Date: Fri, 27 Feb 1998 19:05:45 +0000 (GMT)
Nothing at the moment stops a line discipline calling another line discipline so long as its careful how it sets it up. Its not something you can do sanely for the general case but you can do it cleanly for the specific case and it avoids conditionals in the N_TTY paths
Not quite true. The line discplines make call backs to the driver for things like tty->driver.throttle, tty->driver.unthrottle on the input side. (Which is actually not as bad as I thought it would be; it's much worse if you're following the line discpline ---> tty driver path for tty output.)
This could get changed so that we had a more STREAMS-like approach, where the line discpline called the throttle and untrottled of its calling driver or line discpline, but that's not what we have today.
- Ted
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