linux-kernel - Re: Linux should define ENOTSUP

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Message-ID: <4576F368.4070804@zytor.com>
Date:	Wed, 06 Dec 2006 08:44:24 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Samuel Thibault <samuel.thibault@...-lyon.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Linux should define ENOTSUP

Samuel Thibault wrote:
> H. Peter Anvin, le Wed 06 Dec 2006 07:35:49 -0800, a écrit :
>> Samuel Thibault wrote:
>>>> The two can't be done at the same time.  In fact, the two probably can't 
>>>> be done without a period of quite a few *years* between them.
>>> Not a reason for not doing it ;)
>> No, but breakage is.  There has to be a major benefit to justify the 
>> cost, and you, at least, have not provided such a justification.
> 
> Well, as I said, existing code like
> 
> switch(errno) {
> 	case ENOTSUP:
> 		foo();
> 		break;
> 	case EOPNOTSUP:
> 		bar();
> 		break;
> }
> 

That's pretty weak, though.

	-hpa
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