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Re: Flush stdin

From Marko Rauhamaa <marko@pacujo.net>
Newsgroups comp.lang.python
Subject Re: Flush stdin
Date 2014-10-22 13:57 +0300
Organization A noiseless patient Spider
Message-ID <87y4s8wew7.fsf@elektro.pacujo.net> (permalink)
References (4 earlier) <mailman.15012.1413845578.18130.python-list@python.org> <87mw8qfhza.fsf@elektro.pacujo.net> <mailman.15019.1413851421.18130.python-list@python.org> <87h9yyf318.fsf@elektro.pacujo.net> <mailman.15049.1413933396.18130.python-list@python.org>

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Dan Stromberg <drsalists@gmail.com>:

> On Mon, Oct 20, 2014 at 9:41 PM, Marko Rauhamaa <marko@pacujo.net> wrote:
>> Terminal devices support line buffering on write.
> Yes, though that's not the only place it's useful.
>
>> Line buffering on read is an illusion created by higher-level libraries.
>> The low-level read function reads in blocks of bytes.
>
> Actually, doesn't line buffering sometimes exist inside an OS kernel?
> stty/termios/termio/sgtty relate here, for *ix examples.  Supporting
> code: http://stromberg.dnsalias.org/~strombrg/ttype/  It turns on
> character-at-a-time I/O in the tty driver via a variety of methods for
> portability.  I wrote it in C before I took an interest in Python.

I was being sloppy in my TTY terminology. A TTY device is running inside
the kernel and thus "writes" by copying bytes from its kernel buffer
into the user space when the user space process calls read(2).


Marko

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Thread

Re: Flush stdin Cameron Simpson <cs@zip.com.au> - 2014-10-20 14:56 +1100
  Re: Flush stdin Marko Rauhamaa <marko@pacujo.net> - 2014-10-20 07:45 +0300
    Re: Flush stdin Dan Stromberg <drsalists@gmail.com> - 2014-10-20 14:59 -0700
      Re: Flush stdin Marko Rauhamaa <marko@pacujo.net> - 2014-10-21 01:54 +0300
    Re: Flush stdin Dan Stromberg <drsalists@gmail.com> - 2014-10-20 15:52 -0700
      Re: Flush stdin Marko Rauhamaa <marko@pacujo.net> - 2014-10-21 02:18 +0300
        Re: Flush stdin Dan Stromberg <drsalists@gmail.com> - 2014-10-20 17:30 -0700
          Re: Flush stdin Marko Rauhamaa <marko@pacujo.net> - 2014-10-21 07:41 +0300
            Re: Flush stdin Dan Stromberg <drsalists@gmail.com> - 2014-10-21 16:16 -0700
              Re: Flush stdin Marko Rauhamaa <marko@pacujo.net> - 2014-10-22 08:38 +0300
                Re: Flush stdin Chris Angelico <rosuav@gmail.com> - 2014-10-22 17:23 +1100
              Re: Flush stdin Marko Rauhamaa <marko@pacujo.net> - 2014-10-22 13:57 +0300
            Re: Flush stdin random832@fastmail.us - 2014-10-22 11:01 -0400
              Re: Flush stdin Marko Rauhamaa <marko@pacujo.net> - 2014-10-22 18:28 +0300

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