kern_sendit
error = kern_sendit(td, uap->s, &msg, uap->flags, control,
error = kern_sendit(td, s, mp, linux_to_bsd_msg_flags(flags), control,
error = kern_sendit(td, s, mp, flags, control, UIO_USERSPACE);
int kern_sendit(struct thread *td, int s, struct msghdr *mp, int flags,