linux-kernel - Re: [patch/rfc] eventfd semaphore-like behavior

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Message-ID: <cfd18e0f0902041549t393c76d0s635b5e8c17fee2d1@mail.gmail.com>
Date:	Thu, 5 Feb 2009 12:49:31 +1300
From:	Michael Kerrisk <mtk.manpages@...glemail.com>
To:	Ulrich Drepper <drepper@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Davide Libenzi <davidel@...ilserver.org>,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	linux-api@...r.kernel.org
Subject: Re: [patch/rfc] eventfd semaphore-like behavior

On Thu, Feb 5, 2009 at 12:45 PM, Ulrich Drepper <drepper@...il.com> wrote:
> On Wed, Feb 4, 2009 at 3:05 PM, Andrew Morton <akpm@...ux-foundation.org> wrote:
>> How would you recommend that userspace determine whether its kernel
>> supports this feature, bearing in mind that someone might backport this
>> patch into arbitrarily earlier kernel versions?
>
>   fd = eventfd2 (CNT, EFD_SEMAPHORE);
>   if (fd == -1 && errno == EINVAL)
>     puts("cannot handled EFD_SEMAPHORE");

Crossed mails.  Ulrich put the point more succinctly.


-- 
Michael Kerrisk
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