Re: n_tty: Check the other end of pty pair before returning EAGAIN on a read()

From	Marc Aurele La France <tsi@tuyoix.net>
Newsgroups	linux.kernel
Subject	Re: n_tty: Check the other end of pty pair before returning EAGAIN on a read()
Date	2015-12-18 15:40 +0100
Message-ID	<qH4mo-6QB-81@gated-at.bofh.it> (permalink)
References	(1 earlier) <qEaRk-7yx-21@gated-at.bofh.it> <qEic9-3Yp-9@gated-at.bofh.it> <qEjrA-519-7@gated-at.bofh.it> <qEw5s-52w-23@gated-at.bofh.it> <qEwoO-5c5-15@gated-at.bofh.it>
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On Fri, 11 Dec 2015, Peter Hurley wrote:
> On 12/11/2015 05:37 AM, Marc Aurele La France wrote:

>> I am not asking to read data before it has been produced.  I am puzzled
>> that despite knowing that the data exists, I can now be lied to when I
>> try to retrieve it, when I wasn't before.  We are talking about what is
>> essentially a two-way pipe, not some network or serial connection with
>> transmission delays userland has long experience in dealing with.

>> These previously internal additional delays, that are now exposed to
>> userland, are simply an implementation detail that userland did not,
>> and should not, need to worry about.
>
> Your mental model is that pseudo-terminals are a synchronous pipe, which
> is not true.
>
> But this argument is pointless because the regression needs to be fixed
> regardless of the merits.

Fair enough.

Anything new on this?

Thanks.

Marc.
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Re: n_tty: Check the other end of pty pair before returning EAGAIN  on a read() Marc Aurele La France <tsi@tuyoix.net> - 2015-12-18 15:40 +0100
  Re: n_tty: Check the other end of pty pair before returning EAGAIN on  a read() Peter Hurley <peter@hurleysoftware.com> - 2015-12-18 17:50 +0100
    Re: n_tty: Check the other end of pty pair before returning EAGAIN  on a read() Marc Aurele La France <tsi@tuyoix.net> - 2015-12-18 18:30 +0100

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