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Date:   Mon, 30 Jul 2018 11:08:42 -0700
From:   Matthew Wilcox <willy@infradead.org>
To:     Pavel Machek <pavel@ucw.cz>
Cc:     David Howells <dhowells@redhat.com>, viro@zeniv.linux.org.uk,
        torvalds@linux-foundation.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 36/38] vfs: Add a sample program for the new mount API
 [ver #10]
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On Mon, Jul 30, 2018 at 04:31:04PM +0200, Pavel Machek wrote:
> Well, I guess errors should have numbers, and catalog explaining what
> error means what. That way userspace can translate, and it is what we
> do with errno.
> 
> I believe numbers are best. If you hate numbers, you can still use
> strings, as long as you can enumerate them in docs (but it will be
> strange design).

Have you looked at how gettext() works?  It uses the english text as
a search string and replaces it with the localised string.  This is
a very common design!