sys_undelete
int sys_undelete(struct lwp *, const struct sys_undelete_args *, register_t *);
.sy_call = (sy_call_t *)sys_undelete
return sys_undelete(l, &ua, retval);
.sy_call = (sy_call_t *)sys_undelete
check_syscall_args(sys_undelete)
int sys_undelete(struct lwp *, const struct sys_undelete_args *, register_t *);