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Date:	Sat, 27 Nov 2004 14:06:49 -0500
From:	Christopher Faylor <cgf-no-personal-reply-please AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Cygwin files and devices philosophy
Message-ID:	<20041127190649.GA31577@trixie.casa.cgf.cx>
Reply-To:	cygwin AT cygwin DOT com
References:	<coaaes$q1c$1 AT sea DOT gmane DOT org> <Pine DOT GSO DOT 4 DOT 61 DOT 0411271310231 DOT 14489 AT slinky DOT cs DOT nyu DOT edu>
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On Sat, Nov 27, 2004 at 01:32:00PM -0500, Igor Pechtchanski wrote:
>>In my case, I provide an option for a terminal program what device
>>should be used to open the file.  I don't want to restrict what devices
>>are or are not allowed, except by using function calls to the Posix API
>>to determine if the required functionality can be met.
>
>"\\.\COM37" is not POSIX.  Cygwin is POSIX.  You're trying to use POSIX
>functions (isatty) on a non-POSIX device -- the result is unspecified
>(which means that the above behavior is perfectly valid, as is any
>other).  If you want to write portable code, why not use the equivalent
>POSIX devices?  "/dev/ttyS36" should work, and so should "/dev/com37"
>(according to the documentation).

And, in reality, isatty should (and does, AFAICT) return 0 for anything
opened with \\.\COMn.

cgf

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