dev_im.c

static int dev_im_mq;
static int hb_param_idx;
static int hb_param_type;

int SetDeviceState(fd_ctxt *fd, int *buf)
{
    /* ... */
    switch(buf[0])
    {
    /* ... */
    case 3:
        hb_param_idx = buf[2];
        hb_param_type = buf[1];
    /* ... */
    }
    /* ... */
}

int GetHomeButtonParams(int *buf)
{
    buf[0] = hb_param_type;
    buf[1] = hb_param_idx;
    return 0;
}

int dev_im_handler(...)
{
    while(!recv_msg(dev_im_mq, &req, 0))
    {
        switch(req->cmd)
        {
        /* ... */
        case 4:
            /* ... */
            SetDeviceState(fd_ctxt, (int *)req->vecs[0].phys);
            /* ... */
        case 7:
            /* ... */
            GetHomeButtonParams((int *)req->vecs[0].phys);
            /* ... */
        /* ... */
        }
        /* ... */
    }
    /* ... */
}