static void
kq_dealloc(struct event_base *base)
{
struct kqop *kqop = base->evbase;
evsig_dealloc(base);
kqop_free(kqop);
}
static void *
kq_init(struct event_base *base)
{
int kq = -1;
struct kqop *kqueueop = NULL;
if (!(kqueueop = mm_calloc(1, sizeof(struct kqop))))
return (NULL);
/* Initialize the kernel queue */
if ((kq = kqueue()) == -1) {
event_warn("kqueue");
goto err;
}
kqueueop->kq = kq;
kqueueop->pid = getpid();
/* Initialize fields */
kqueueop->changes = mm_calloc(NEVENT, sizeof(struct kevent));
if (kqueueop->changes == NULL)
goto err;
kqueueop->events = mm_calloc(NEVENT, sizeof(struct kevent));
if (kqueueop->events == NULL)
goto err;
kqueueop->events_size = kqueueop->changes_size = NEVENT;
/* Check for Mac OS X kqueue bug. */
memset(&kqueueop->changes[0], 0, sizeof kqueueop->changes[0]);
kqueueop->changes[0].ident = -1;
kqueueop->changes[0].filter = EVFILT_READ;
kqueueop->changes[0].flags = EV_ADD;
/*
* If kqueue works, then kevent will succeed, and it will
* stick an error in events[0]. If kqueue is broken, then
* kevent will fail.
*/
if (kevent(kq,
kqueueop->changes, 1, kqueueop->events, NEVENT, NULL) != 1 ||
kqueueop->events[0].ident != -1 ||
kqueueop->events[0].flags != EV_ERROR) {
event_warn("%s: detected broken kqueue; not using.", __func__);
goto err;
}
base->evsigsel = &kqsigops;
base->evsigbase = kqueueop;
return (kqueueop);
err:
if (kqueueop)
kqop_free(kqueueop);
return (NULL);
}