Re: [PATCH] /dev/epoll update ...

[Davide Libenzi]

On 19-Sep-2001 Christopher K. St. John wrote:
> Dan Kegel wrote:
>> 
>> I'm getting ready to stress-test /dev/epoll finally.
>> In porting my Poller_devpoll.{cc,h} to support /dev/epoll, I noticed
>> the following issues:
>> 
> 
>  Another issue to throw into the mix:
> 
>  The Banga, Mogul and Druschel[1] paper (which I understand
> was the inspiration for the Solaris /dev/poll which was the
> inspiration for /dev/epoll?) talks about having the poll
> return the current state of new descriptors. As far as I can
> tell, /dev/epoll only gives you events on state changes. So,
> for example, if you accept() a new socket and add it to the
> interest list, you (probably) won't get a POLLIN. That's
> not fatal, but it's awkward.

Being an event change notification you simply can't add the fd
to the "monitor" after you've issued the accept().
The skeleton for /dev/epoll usage is :

while (system_call(...) == FAIL) {

        wait_event();
}

- Davide