Function kern_kqueue

freebsd/kern/kern_event.c:972–1007

}

int
kern_kqueue(struct thread *td, int flags, struct filecaps *fcaps)
{
	struct filedesc *fdp;
	struct kqueue *kq;
	struct file *fp;
	struct ucred *cred;
	int fd, error;

	fdp = td->td_proc->p_fd;
	cred = td->td_ucred;
	if (!chgkqcnt(cred->cr_ruidinfo, 1, lim_cur(td, RLIMIT_KQUEUES)))
		return (ENOMEM);

	error = falloc_caps(td, &fp, &fd, flags, fcaps);
	if (error != 0) {
		chgkqcnt(cred->cr_ruidinfo, -1, 0);
		return (error);
	}

	/* An extra reference on `fp' has been held for us by falloc(). */
	kq = malloc(sizeof *kq, M_KQUEUE, M_WAITOK | M_ZERO);
	kqueue_init(kq);
	kq->kq_fdp = fdp;
	kq->kq_cred = crhold(cred);

	FILEDESC_XLOCK(fdp);
	TAILQ_INSERT_HEAD(&fdp->fd_kqlist, kq, kq_list);
	FILEDESC_XUNLOCK(fdp);

	finit(fp, FREAD | FWRITE, DTYPE_KQUEUE, kq, &kqueueops);
	fdrop(fp, td);

	td->td_retval[0] = fd;
	return (0);
}

struct g_kevent_args {
	int	fd;