From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Mayank Rana <mrana@codeaurora.org>
Cc: linux-serial@vger.kernel.org
Subject: Re: About changing Line Discipline from Kernel
Date: Wed, 22 Feb 2012 09:34:25 +0000 [thread overview]
Message-ID: <20120222093425.2efcbca0@pyramind.ukuu.org.uk> (raw)
In-Reply-To: <4F4493AC.5010405@codeaurora.org>
> 1. I understand that line discipline can be changed from user space
> application by opening the device and doing ioctl with required Line
> Discipline ID. Is it possible to do the same from kernel module who
> would be communicating with that line discipline ?
Not currently. You need something to hold the tty open anyway if you do
this.
> 2. Is it way to set default line discipline for particular tty device
> to required Line Discipline instead of N_TTY one ?
No. All tty devices start in N_TTY and return to N_TTY when closed.
That's a design assumption in the ldisc handling and in in the tty setup
and teardown code paths.
There is no API/ABI reason for the assumption so if someone did the work
they could remove that assumption.
Alan
prev parent reply other threads:[~2012-02-22 9:32 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-22 7:05 About changing Line Discipline from Kernel Mayank Rana
2012-02-22 8:22 ` Søren holm
2012-02-22 9:34 ` Alan Cox [this message]
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