<br><br><div class="gmail_quote">2008/12/15 Dino Viehland <span dir="ltr"><<a href="mailto:dinov@microsoft.com">dinov@microsoft.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Presumably CPython is linking against msvcrt and is using the C abstraction rather than calling the Win32 APIs which return handles directly.<br>
<br>
As Curt said the biggest problem for us is that .NET does not expose C file descriptors. Therefore we could fix this by P/Invoking out to msvcrt. For users on other platforms we'd need to either add support for their platform or hope that their handles == C runtime file descriptors. For something like fileno maybe this is ok because it's an interop point only - or are there any non-interop uses of fileno in the world?<br>
<br>
What do people think of this? This would be the 1st place where we would add a P/Invoke so I'd want to tread lightly and make sure this is really the right thing to do.</blockquote><div><br><br>Well, some way of doing this is needed if certain Python C extensions are to work with Ironclad. Perhaps a global or per engine setting that allows file handles to be associated with a C descriptor. Users of Ironclad could switch it on if they wished and take the consequences.<br>
<br>Michael Foord<br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
<div><div></div><div class="Wj3C7c"><br>
-----Original Message-----<br>
From: <a href="mailto:users-bounces@lists.ironpython.com">users-bounces@lists.ironpython.com</a> [mailto:<a href="mailto:users-bounces@lists.ironpython.com">users-bounces@lists.ironpython.com</a>] On Behalf Of Slide<br>
Sent: Monday, December 15, 2008 10:21 AM<br>
To: Discussion of IronPython<br>
Subject: Re: [IronPython] IronPython and file descriptors<br>
<br>
On Mon, Dec 15, 2008 at 11:18 AM, Tom Wright<br>
<<a href="mailto:tom.wright@resolversystems.com">tom.wright@resolversystems.com</a>> wrote:<br>
> Agreed. It is certainly possible with some work to get a file descriptor and<br>
> pass it to C code.<br>
><br>
> This is not the problem, however. Ironclad's aim (eventually) is to allow<br>
> *arbitrary* C extensions to work with Ironpython without changing the<br>
> extensions. Ctypes aim is to allow arbitrary C code to be run by python<br>
> (possibly in other python libraries which you really don't want to modify).<br>
><br>
> In CPython .fileno() is a file descriptor and some modules use this fact<br>
> (specifically PIL) by passing file descriptors as integers into C code. I do<br>
> not know how one can make this code work in IronPython unless .fileno()<br>
> returns a file descriptor.<br>
><br>
> The game here is not making a particular C library work with IronPython by<br>
> modifying this library but making as many libraries as possible work without<br>
> modification. Of course whether this is worthwhile depends on how many<br>
> libraries rely on this fact.<br>
><br>
> Sorry - I hope this is a little clearer.<br>
><br>
> Tom<br>
<br>
<br>
How does CPython get the file descriptor for fileno()? Does it just<br>
return the HANDLE on Windows?<br>
<br>
slide<br>
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