func (p poller) Add(fd int, flags Flags) error {
var ev C.struct_epoll_event
if flags&In != 0 {
ev.events |= C.EPOLLIN
}
if flags&Out != 0 {
ev.events |= C.EPOLLOUT
}
if flags&OneShot != 0 {
ev.events |= C.EPOLLONESHOT
}
var dataFd = (*C.int)(unsafe.Pointer(&ev.data))
*dataFd = C.int(fd)
ok, err := C.epoll_ctl(C.int(p), C.EPOLL_CTL_ADD, C.int(fd), &ev)
if ok < 0 && err != nil {
if err == syscall.EEXIST {
// Try MOD
ok, err = C.epoll_ctl(C.int(p), C.EPOLL_CTL_MOD, C.int(fd), &ev)
}
}
if ok >= 0 {
err = nil
}
return err
}
func (p poller) Delete(fd int) error {
var ev C.struct_epoll_event
// event must be non-NULL in kernels < 2.6.9
ok, err := C.epoll_ctl(C.int(p), C.EPOLL_CTL_DEL, C.int(fd), &ev)
if ok < 0 {
return err
}
return nil
}