stmf_copyin_iocdata
ret = stmf_copyin_iocdata(data, mode, &iocd, &ibuf, &obuf);
ret = stmf_copyin_iocdata(data, mode, &iocd, &ibuf, &obuf);
ret = stmf_copyin_iocdata(data, mode, &iocd, &ibuf, &obuf);
int stmf_copyin_iocdata(intptr_t data, int mode, stmf_iocdata_t **iocd,