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Date: Wed, 27 Jun 2012 11:51:28 +0200
From: Sascha Hauer <s.hauer@pengutronix.de>
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Subject: Re: is errno supposed to be positive or negative?
To: Uwe =?iso-8859-15?Q?Kleine-K=F6nig?= <u.kleine-koenig@pengutronix.de>
Cc: barebox@lists.infradead.org

On Wed, Jun 27, 2012 at 11:35:51AM +0200, Uwe Kleine-K=F6nig wrote:
> Hello,
> =

> Well, ok, errno is supposed to be zero, but in the rare cases where it's
> not, what is intended?
> =

> Assuming ESOMETHING is always positive, in userspace errno is
> positive, e.g. you test for errno =3D=3D EBADF.
> =

> In barebox however most assignments use
> =

> 	errno =3D -ESOMETHING
> =

> but there are also some tests and assignments without minus. barebox'
> perror expects a negative errno which is also different from POSIX'
> perror. strerror uses positive semantics in both barebox and POSIX.

Your tree is not up to date.

see:

commit 6188685091c58c9772b990cf0ca6ac522f97a9d0
Author: Sascha Hauer <s.hauer@pengutronix.de>
Date:   Sun May 13 12:43:58 2012 +0200

    Make errno a positive value
    =

    Normally errno contains a positive error value. A certain unnamed devel=
oper
    mixed this up while implementing U-Boot-v2. Also, normally errno is nev=
er
    set to zero by any library function. This patch fixes this.
    =

    Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Sascha

-- =

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