Date: Sun, 22 Nov 1998 19:27:25 +0200 (SAT) From: Robert Nordier <rnordier@nordier.com> To: nectar@FreeBSD.ORG Cc: hackers@FreeBSD.ORG Subject: Re: errno Message-ID: <199811221727.TAA07219@ceia.nordier.com> In-Reply-To: <XFMail.981122100421.nectar@FreeBSD.ORG> from "nectar@FreeBSD.ORG" at "Nov 22, 98 10:04:21 am"
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nectar@FreeBSD.ORG wrote:
> The following code snippet won't compile on -CURRENT, or on -STABLE with
> _THREAD_SAFE defined due to ``errno'' being a macro in <errno.h>:
>
> #include <errno.h>
> struct example {
> int errno;
> };
>
> I understand why, but is this code incorrect ANSI C? I'm just
> trying to find a reference that prohibits this use.
7.1.4: .... It is unspecified whether errno is a macro or an
identifier declared with external linkage. If a macro definition
is suppressed in order to access an actual object, or a program
defines an identifier with the name errno, the behavior is
undefined.
--
Robert Nordier
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