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Date: Fri, 09 Mar 2012 14:31:29 +0200
From: Eli Zaretskii <eliz AT gnu DOT org>
Subject: Re: errno returned by open()
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> From: Martin Strömberg <ams AT ludd DOT ltu DOT se>
> Date: Fri, 9 Mar 2012 12:53:19 +0100 (MET)
> 
> According to Juan Manuel Guerrero:
> > Am Mittwoch, 7. März 2012 schrieb Eli Zaretskii:
> [ errno setting stuff. ]
> 
> This sounds weird to me. If you call a function that sets errno on
> failure (open e. g.), you must be prepared for that errno is changed.

Not if there was no error.  It is a curtesy to the caller to leave
errno alone in that case.

(Btw, your mail falsely claims to be encoded in Latin-1, whereas it
really uses UTF-8.)