[docs] [issue34115] code.InteractiveConsole.interact() closes stdin

[Yonatan Zunger]

Yonatan Zunger <zunger at humu.com> added the comment:

Eryk: Thanks for finding that! So that I'm sure I understand, if 34187 is
resolved, does that mean the stdin.close() is no longer required at all in
_Quitter?

On Sun, Jul 22, 2018 at 2:12 AM Eryk Sun <report at bugs.python.org> wrote:

>
> Eryk Sun <eryksun at gmail.com> added the comment:
>
> > On Windows Console, sys.stdin.close() does not prevent a second
> > interact call.  This might be considered a bug.
>
> This is a bug in io._WindowsConsoleIO.
>
> In Python 3, the sys.std* file objects that get created at startup use
> closefd=False:
>
>     >>> sys.stdin.buffer.raw.closefd
>     False
>     >>> sys.stdout.buffer.raw.closefd
>     False
>     >>> sys.stderr.buffer.raw.closefd
>     False
>
> Since the REPL uses C FILE streams (or in 3.6+ the underlying console file
> handle in Windows), closing sys.stdin does not cause the REPL to exit, and
> the PyOS_ReadLine call in the interactive loop continues to work in both
> POSIX and Windows.
>
> That said, closing sys.stdin should cause input() to raise ValueError due
> to sys.stdin.fileno() failing (i.e. take the non-tty path) and subsequently
> sys.stdin.readline() failing. A second call to
> code.InteractiveConsole.interact() should thus fail. The issue is that the
> fileno() method of _WindowsConsoleIO isn't raising ValueError like it
> should when the file is closed and closefd is false. I've created issue
> 34187 with a suggested fix.
>
> ----------
> nosy: +eryksun
>
> _______________________________________
> Python tracker <report at bugs.python.org>
> <https://bugs.python.org/issue34115>
> _______________________________________
>

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34115>
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