Re: n_tty_ioctl usage question

From: Theodore Y. Ts'o (tytso@MIT.EDU)
Date: Mon May 29 2000 - 18:06:42 EST


   Date: Mon, 29 May 2000 16:02:16 -0600
   From: Prarit <prarit@youtwo.net>

   Does anyone have driver (any driver!) code using n_tty_ioctl that
   they could send me? I'm trying to use the "open" command to get
   an fd in a driver -- but can't (obviously because it's not in
   the ksyms listing) ...

Huh? What are you doing? n_tty_ioctl the ioctl handler for the N_TTY.
If you are writing a tty driver, you don't need to worry about
n_tty_ioctl; if the tty's line discpline is N_TTY, it gets called
automatically.

As for trying to get a fd in a driver, you can't do that. File
descriptors are userspace entities; you can't have fd in kernel space.
What precisely, are you trying to do? If I had to guess you probably
need to be creating a tty line discpline, but until you state exactly
what it is you're trying to do, I can't be sure.

                                                - Ted

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