kern_exit
kern_exit(td, args->rval, 0);
kern_exit(td, args->error_code, 0);
kern_exit(td, 0, SIGABRT);
kern_exit(td, uap->rval, 0);
kern_exit(td, 0, SIGKILL);
kern_exit(td, 0, sig);
void kern_exit(struct thread *, int, int);