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To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>, Bruno Haible <bruno AT clisp DOT org>
Subject: RE: [EXTERNAL] Re: /dev/null regression in Cygwin 3.6.1
Thread-Topic: [EXTERNAL] Re: /dev/null regression in Cygwin 3.6.1
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Date: Mon, 14 Apr 2025 15:08:06 +0000
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From: "Lavrentiev, Anton \(NIH/NLM/NCBI\) \[C\] via Cygwin" <cygwin AT cygwin DOT com>
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Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

> (correct me if I'm wrong), READING from /dev/null is
> undefined and may result in undetermined behavior.

That's an incorrect recollection of facts, unfortunately.
Reading from /dev/null should result in an immediate EOF
(0 returned from read()).

> But "< /dev/null" literally means "don't read from STDIN".

No, it means that stdin in going to contain no data.

HTH,

Anton Lavrentiev
Contractor NIH/NLM/NCBI


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