linux-kernel - Re: Question on tty line discipline

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Date:	Sat, 03 Mar 2007 21:00:43 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Christopher Meller <cmeller@...ominate.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Question on tty line discipline

Am 28.02.2007 14:47 schrieb Christopher Meller:
> 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. 

Is that really so? While testing a line discipline I have written
myself (N_GIGASET_M101) I came to the opposite conclusion.

Specifically, when I set the line discipline on eg. /dev/ttyS1 to
N_GIGASET_M101 from the user space daemon I have written for that
purpose, and that user space daemon exits, my line discipline is
removed, ie. its .close method is called. That is true even if I
kill the user space daemon by sending it an uncaught signal.

-- 
Tilman Schmidt                          E-Mail: tilman@...p.cc
Bonn, Germany
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