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Date: Mon, 11 Dec 2000 13:36:05 -0500
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin <cygwin AT cygwin DOT com>
Subject: Re: Why does scp leave ssh running? -- select() never returns
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In-Reply-To: <3A351ADE.EF54C845@delcomsys.com>; from wpd@delcomsys.com on Mon, Dec 11, 2000 at 01:20:14PM -0500

On Mon, Dec 11, 2000 at 01:20:14PM -0500, Patrick Doyle wrote:
>So far, the most elegant solution I have come up with is to reimplement
>'select()' so that it calls 'ReadFileEx()' with a suitable 'OVERLAPPED'
>structure, thus eliminating the separate thread that wakes up every 10
>ms.  Of course, if I read a byte from the pipe, I would have to buffer
>it somewhere and fix 'read()' so that it checks for the "readahead" byte
>first, but that is basically solvable.  If the call to 'select()'
>returned for some other reason (i.e. another fd was made ready), then
>call 'CancelIo()' to terminate the asynchronous read.

I'm pretty sure that overlapped I/O does not work with any flavor of pipe.
It should be possible to make a simple test case, to verify though.

cgf

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