_ioctlv_new.c

int _ioctlv(int fd, int cmd, u32 num_in, u32 num_io, ioctlv_vec *vec, ...)
{
    /* ... */
    dev_ctxt *dev = get_dev(...);
    u32 num_total = num_int + num_out;
    /* ... */
    if(num_total <= dev->max_vecs)
    {
        /* Copy in vectors if num_total <= 8 else use external vectors. */
        /* Check vector buffer addrs. */
    }
    else
        res = -11;
    /* ... */
}

int _dev_register(char *path, int mqid, int pid)
{
    /* ... */
    dev->max_vecs = 8;
    /* ... */
}

int syscall_2E_set_ioctlv_max_vecs(char *name, u16 num)
{
    /* ... */
    dev->max_vecs = num;
    /* ... */
}