linux-kernel - Re: [RFC] scripts: kerrno.sh

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Message-ID: <20150430122512.GE4996@twin.jikos.cz>
Date:	Thu, 30 Apr 2015 14:25:12 +0200
From:	David Sterba <dsterba@...e.cz>
To:	Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:	Richard Weinberger <richard.weinberger@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>
Subject: Re: [RFC] scripts: kerrno.sh - errno translator

On Thu, Apr 30, 2015 at 01:29:41PM +0200, Bartosz Golaszewski wrote:
> 2015-04-30 13:04 GMT+02:00 Richard Weinberger <richard.weinberger@...il.com>:
> > On Thu, Apr 30, 2015 at 12:53 PM, Bartosz Golaszewski
> > <bgolaszewski@...libre.com> wrote:
> >> Shell script allowing to find errno definitions and descriptions in the
> >> kernel source.
> >>
> >> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >> ---
> >> This is a simple script I use when seeing messages like:
> >>
> >>         some_func() failed: -123
> >
> > What is wrong with a one-liner like:
> > gcc -E -dD - < include/uapi/linux/errno.h |grep -E "^#define E.* 123$"
> 
> Nothing really - the output is less nice, that's all.

I'd find a helper script useful in situations where I don't know the
error code immediatelly and have to convert it from a hexa value first.
Eg. when RAX contains an error code after a BUG_ON:

RAX: 00000000ffffffe4

this translates to -28 == -ENOSPC.
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