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SubjectRe: [PATCH] EPOLL_CTL_SET operatin for epoll_ctl when using EPOLLONESHOT
On Thu, 24 Sep 2009, Carlo Marcelo Arenas Belon wrote:

> Simplify userspace by eliminating the need to track whether a specific
> filehandle was added to epoll already and only needs to be re-arm
> after being internally disabled by EPOLLONESHOT.
> EPOLL_CLT_SET can be used to add or modify a filehandle in epoll
> using the kernel's internal tracking to apply the right equivalent
> operation to EPOLL_CTL_ADD or EPOLL_CTL_MOD.

Applications (except poorly written ones) usually know what's in the
epoll set and what's not, in their bookkeeping.
I'm sorry, but I see no use of this code.

- Davide

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