Date: Thu, 18 Jun 1998 00:13:05 +0100 From: Richard Tobin <richard@cogsci.ed.ac.uk> To: Warner Losh <imp@village.org>, Terry Lambert <tlambert@primenet.com> Cc: current@FreeBSD.ORG Subject: Re: Bogus errno twiddling by lstat... Message-ID: <22587.199806172313@cockburn.cogsci.ed.ac.uk> In-Reply-To: Warner Losh's message of Wed, 17 Jun 1998 11:30:21 -0600
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> No. When a system call returns success, the value of errno is
> undefined.
No! A successful system call leaves it *unchanged*. From intro(2):
Successful calls never set errno; once set, it remains
until another error occurs.
I believe ANSI C has a similar requirement.
You should only examine errno after an error, but you are allowed to have
had intervening successful system calls.
-- Richard
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