Re: epoll vs stdin/stdout

[Eric Varsanyi <e0216@foo21.com>]

On Tue, Jul 08, 2003 at 08:42:29AM -0700, Davide Libenzi wrote:
> It is not that events are delivered per-fd. If 3 and 4 refer to the same
> file* and you register both 3 and 4 with EPOLLIN, you'll get two events if
> an EPOLLIN happen. One for 3 and one for 4.

Agreed 100%, this is roughly what would happen with select() as well which      
IMO is good (not surprising behaviour) for event loop writers: it would         
return with both bits set. The EEXIST we were getting before this patch         
would be analogous to select() returning an error if you set 2 bits that        
where for fd's sharing an object (even across read/write bit vectors).          
                                                                                
One could argue at the logic of having 2 fd's get read events on a              
shared underlying object, but one read and the other write certainly            
makes sense as discussed earlier.                                               
                                                                                
Thanks again,                                                                   
-Eric Varsanyi