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

[Ulrich Drepper]

On Wed, Feb 4, 2009 at 3:05 PM, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> 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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