[openib-general] Re: [PATCH] signal driven io support for ib_uverbs

[Gleb Natapov]

On Thu, Jul 07, 2005 at 09:04:12AM -0700, Roland Dreier wrote:
>     Gleb> The question is what is the right way? Do it from the kernel
>     Gleb> or left it to userspace? Parts of the kernel do f_setown()
>     Gleb> from the kernel others don't.
> 
> I think that userspace is supposed to do the fcntl.  For example, the
> code at <http://kegel.com/c10k.html> looks like:
> 
> 	/* For each file descriptor, invoke F_SETOWN, F_SETSIG, and set O_ASYNC. */
> 	fcntl(fd, F_SETOWN, (int) getpid());
> 	fcntl(fd, F_SETSIG, signum);
> 	flags = fcntl(fd, F_GETFL);
> 	flags |= O_NONBLOCK|O_ASYNC;
> 	fcntl(fd, F_SETFL, flags);
> 

The kernel is inconsistent in this respect so correct program should set
owner anyway. Lets use your patch.

--
			Gleb.