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SubjectRe: [rfc] epoll interface change and glibc bits ...
Davide Libenzi wrote:
>>I'd be happy to contribute better doc... has the man page
>>for sys_epoll been written yet?
>
> http://www.xmailserver.org/linux-patches/epoll.2
> http://www.xmailserver.org/linux-patches/epoll_create.2
> http://www.xmailserver.org/linux-patches/epoll_ctl.2
> http://www.xmailserver.org/linux-patches/epoll_wait.2
>
> it is going to change though with the latest talks about the interface.

Hmm. Right off the bat, I see a terminology problem.
The man page says

.SH NAME
epoll \- edge triggered asynchronous I/O facility

That's going to confuse some users. They might think
epoll can actually initiate I/O. Better to say

epoll \- edge triggered I/O readiness notification facility

Second, epoll_ctl(2) doesn't define the meaning of the
event mask. It should give the allowed bits and define
their meanings. If we use the traditional POLLIN etc, we
can say
POLLIN - the fd has become ready for reading
POLLOUT - the fd has become ready for writing
Note: If epoll tells you e.g. POLLIN, it means that
poll will tell you the same thing,
since poll gives the current status,
and epoll gives changes in status.

- Dan


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