hi, group
i have question in epoll functions.
as we know, user can use poll_wait() as follows:
for(;;) {
nfds = epoll_wait(kdpfd, events, maxevents, -1);
for(n = 0; n < nfds; ++n) {
do_my_function(events[n].data.fd);
}
}
that means we can get the new events from the parameter events from
epoll_wait().
Then i search the kernel, and find the new events comes from
ep_send_events() finally , through sys_poll_wait() and ep_poll().
the ep_send_evnets() shows as follows:
static int ep_send_events(struct eventpoll *ep, struct epoll_event
__user *events, int maxevents)
{
....
revents = epi->ffd.file->f_op->poll(epi->ffd.file, NULL); //in here,
revents = POLLIN | POLLRDNORM;
revents &= epi->event.events; // i wonder where changes the
epi->event.events??
}
So, the revents comes from epi->event.events. But, i wonder where
changes the epi->event.events? i find nothing from lxr.linux.no by
search "event.evnets" as keyword.
Can anybody help me?
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