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Date:	Mon, 11 Dec 2000 14:08:43 -0500
From:	Christopher Faylor <cgf AT redhat DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Why does scp leave ssh running? -- select() never returns
Message-ID:	<20001211140843.A7927@redhat.com>
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In-Reply-To:	<3A352393.4D8645EC@delcomsys.com>; from wpd@delcomsys.com on Mon, Dec 11, 2000 at 01:57:23PM -0500

On Mon, Dec 11, 2000 at 01:57:23PM -0500, Patrick Doyle wrote:
>Christopher Faylor wrote:
>> 
>> 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.
>> 
>My question is more of a philosophical one.  If I try it, and it happens
>to work on my W98 box, but it is listed as "unsupported" in the official
>Microsoft documentation, would you still want to incorporate it into
>cygwin?

I wouldn't suggest a test case if I wasn't willing to try it.

cgf

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