linux-kernel - Re: serial and tty driver

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Message-Id: <45D813EA.000008.23689@soapbox.yandex.ru>
Date:	Sun, 18 Feb 2007 11:52:58 +0300 (MSK)
From:	"Mockern" <Mockern@...dex.ru>
To:	tytso@....edu
Cc:	linux-kernel@...r.kernel.org
Subject: Re: serial and tty driver

Thank you for you respond.

I asked this question since I have one problem with my tty driver.
It based on serial_core.c. It works well except Linux cat operation:(.
(e.g. cat < ttyS10). I thought in tty driver there is no function
for this operation and I wanted to know that maybe serial driver has it.

Could it be the reason that cat operation in tty driver does not work
(but I can write and read from user space application!)?
Or maybe I need to implement a special function in my tty driver to support Linux
cat operation?

Thank you again 

  

>On Sat, Feb 17, 2007 at 12:24:22PM -0600, Paul Fulghum wrote:
>> Mockern wrote:
>> >I have a question, what is really difference between serial and tty
>> >drivers?
>> >
>> >As I understand tty is high level and communicates with user space. 
>> 
>> The serial core implements many of the details of a tty
>> driver in a common place so that individual hardware drivers
>> (serial drivers) only need implement the hardware specific code.
>> 
>> This prevents duplicating tty logic in many drivers,
>> with the possibility of mistakes/inconsistency in the
>> different tty drivers.
>> 
>> The stand alone tty drivers are mostly legacy code from
>> the time before serial core that have not been ported
>> to be a serial drivers.
>
>Not necessarily; there are a number of tty drivers, such as the
>console drivers and pseudo-tty drivers that have absolutely nothing to
>do with an RS-232 port.
>
>On the other side of the argument, another factorization of the layers
>that might have made sense was to move the functionality to the
>high-level tty layer (or in the case of hangup code, all the way up to
>the VFS layer as a generic sys_revoke functionality), but the reason
>why it didn't is largely historical.
>
>						- Ted
>-
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