On Thu, Feb 5, 2009 at 12:45 PM, Ulrich Drepper <[email protected]> wrote: > On Wed, Feb 4, 2009 at 3:05 PM, Andrew Morton <[email protected]> > 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 Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ git://git.kernel.org/pub/scm/docs/man-pages/man-pages.git man-pages online: http://www.kernel.org/doc/man-pages/online_pages.html Found a bug? http://www.kernel.org/doc/man-pages/reporting_bugs.html -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
