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#include <sys/epoll.h>
static int epoll_fd = -1;
static void
epoll_modify (int fd, int oev, int nev)
{
int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL;
struct epoll_event ev;
ev.data.fd = fd;
ev.events =
(nev & EV_READ ? EPOLLIN : 0)
| (nev & EV_WRITE ? EPOLLOUT : 0);
epoll_ctl (epoll_fd, mode, fd, &ev);
}
void epoll_postfork_child (void)
{
int fd;
epoll_fd = epoll_create (256);
fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
/* re-register interest in fds */
for (fd = 0; fd < anfdmax; ++fd)
if (anfds [fd].wev)
epoll_modify (fd, EV_NONE, anfds [fd].wev);
}
static struct epoll_event *events;
static int eventmax;
static void epoll_poll (ev_tstamp timeout)
{
int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.));
int i;
if (eventcnt < 0)
return;
for (i = 0; i < eventcnt; ++i)
fd_event (
events [i].data.fd,
(events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0)
| (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0)
);
/* if the receive array was full, increase its size */
if (eventcnt == eventmax)
{
free (events);
eventmax += eventmax >> 1;
events = malloc (sizeof (struct epoll_event) * eventmax);
}
}
void epoll_init (int flags)
{
epoll_fd = epoll_create (256);
if (epoll_fd < 0)
return;
fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
ev_method = EVMETHOD_EPOLL;
method_fudge = 1e-3; /* needed to compensate for epoll returning early */
method_modify = epoll_modify;
method_poll = epoll_poll;
eventmax = 64; /* intiial number of events receivable per poll */
events = malloc (sizeof (struct epoll_event) * eventmax);
}
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