From mboxrd@z Thu Jan  1 00:00:00 1970
From: Morten Welinder <mwelinder@gmail.com>
Subject: Re: [PATCH] mmap error handling
Date: Thu, 28 Jul 2005 19:29:57 -0400
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To: Pavel Roskin <proski@gnu.org>
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> I have verified that successful close() after failed mmap() won't reset
> the output of perror() to "Success".

Does $standard guarantee that?

In general, successful libc calls can set errno to whatever they
please, except zero.  And they sometimes do.  This follows from
C99.

Morten