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Date: Thu, 8 Aug 2002 16:32:59 -0400
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: OpenSSH and WinCVS in Windows 9x
Message-ID: <20020808203259.GB14854@redhat.com>
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References: <20020806140534 DOT 757a155a DOT steven DOT obrien2 AT ntlworld DOT com> <200208081932 DOT 25737 DOT laurent DOT pinchart AT capflow DOT com> <20020808175335 DOT GG11425 AT redhat DOT com> <200208082048 DOT 14548 DOT laurent DOT pinchart AT capflow DOT com>
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On Thu, Aug 08, 2002 at 08:48:14PM +0200, Laurent Pinchart wrote:
>> The problem is not in cygwin.  If you are communicating with pipes
>> between non-cygwin application and a cygwin application and expecting
>> EOF notification on pipes you are not going to get it.  Microsoft
>> doesn't provide any reliable way of finding that information on Windows
>> 9x.
>
>That's bad news :-(
>
>From the cygwin code (peek_pipe AT select DOT cc), I assume that PeekNamedPipe 
>returns a negative value for lpTotalBytesAvail on EOF in win2k, and 0 in 
>win9x.
>
>I'll write a simple application to check that tomorrow.
>
>BTW I looked at the putty code, and it uses a thread to read from stdin.
>
>Well, I still think it should be possible to get notified of such an event. 
>feof() from mscvrt manages to do so...

feof on msvcrt is not interruptible by a signal using the UNIX paradigm
and probably doesn't use PeekNamedPipe before performing a ReadFile.

If you're just using a ReadFile to read from a pipe, then it will, of
course handle an eof.  Cygwin can't do things that simply.

cgf

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