Re: Question on tty line discipline

From: Alan <alan@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 28 Feb 2007 15:37:02 +0000

On Wed, 28 Feb 2007 14:47:12 +0100
Christopher Meller <cmeller@xxxxxxxxxxxxxx> wrote:

Hi,

I have a question concerning the line discipline behaviour for serial
devices.
When the line discipline is set via ioctl from user space to e.g. N_PPP and the userspace program returns without resetting the line discipline back to N_TTY, the serial device cannot be used (ENODV) until an appropriate ioctl (to N_TTY) is performed. Is there any reason for the fact that the line discipline is not reset by the kernel , when closing the device.

No special reason, it has simply always been that way. Getty and friends
are expected to put the tty back into a sane state.
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References:
- Question on tty line discipline
  - From: Christopher Meller

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