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

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Message-ID: <a36005b50902041545qb9ce459y710bb3b9b8949b17@mail.gmail.com>
Date:	Wed, 4 Feb 2009 15:45:47 -0800
From:	Ulrich Drepper <drepper@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	mtk.manpages@...il.com, linux-api@...r.kernel.org
Subject: Re: [patch/rfc] eventfd semaphore-like behavior

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");
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