- struct timespec timeout = { 0, 0 };
- struct kevent ev[2];
- unsigned int changed;
- int nev = 0;
- unsigned int fl = 0;
-
- changed = fd->kqflags ^ flags;
- if (changed & ULOOP_EDGE_TRIGGER)
- changed |= flags;
-
- if (changed & ULOOP_READ) {
- uint16_t kflags = get_flags(flags, ULOOP_READ);
- EV_SET(&ev[nev++], fd->fd, EVFILT_READ, kflags, 0, 0, fd);
- }
-
- if (changed & ULOOP_WRITE) {
- uint16_t kflags = get_flags(flags, ULOOP_WRITE);
- EV_SET(&ev[nev++], fd->fd, EVFILT_WRITE, kflags, 0, 0, fd);
- }
-
- if (!flags)
- fl |= EV_DELETE;
-
- if (nev && (kevent(poll_fd, ev, nev, NULL, fl, &timeout) == -1))
- return -1;
-
- fd->kqflags = flags;
- return 0;