Re: ioctl

Okay,

It's what I have done so far but still, there is one thing I don't
understand.

Let's assume I add a method like:

static int ipw_get_status(struct net_device *dev, struct iwreq *wreq) {
	struct ipw_priv *priv = ieee80211_priv(dev);
	mutex_lock(&priv->mutex);
	wreq->u.uparam.value = priv->status;
	IPW_DEBUG_WX("Get status -> %d\n", wreq->u.param.value);
	mutex_unlock(&priv->mutex);
	return 0;
}

I also add the ioctl handler:

enum {
	IPW_PRIV_SET_POWER = SIOCIWFIRSTPRIV,
	IPW_PRIV_GET_POWER,
(...)
	IPW_PRIV_GET_STATUS
};

static struct iw_priv_args ipw_priv_args[] = {
	{
	 .cmd = IPW_PRIV_SET_POWER,
	 .set_args = IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1,
	 .name = "set_power"},
(...)
	{
	 .cmd = IPW_PRIV_GET_STATUS,
	 .get_args = IW_PRIV_TYPE_CHAR | IW_PRIV_SIZE_FIXED | MAX_WX_STRING,
	 .name = "get_status"},
};

static iw_handler ipw_priv_handler[] = {
	ipw_wx_set_powermode,
(..)
	ipw_get_status
};

I can call the method from a user-space process with something like:


int sock;
struct iwreq wrq;

sock = socket(AF_INET, SOCK_DGRAM, 0);
ioctl(sock, SIOCIWFIRSTPRIV + 10, &wrq);

And with debug, I clearly see the output "Get status -> 2"

Nevertheless, I cannot access it through wrq.u.param.value from the
user-space process. why?

Actually, what I don't understand is how arguments are handle,
especially in the case of zero, one or many args.

Can someone explain me the bitmask of the .set_args and .get_args?

Instead of using SIOCIWFIRSTPRIV + 10, is there another way to call the
method?

I am really sorry about all these questions but I cannot figure it out
by myself. I read the LDD book, wireless.h, iwpriv.h, wireless-tools
source (iwlib.h, iwlib.c, iwconfig.c) but it's still "dark" for me :)

Thanks!

Fred.

Pedro Ramalhais wrote:
> Paolo wrote:
>> On Sun, Oct 01, 2006 at 09:27:34PM +0200, Frederic wrote:
>>> I don't understand exactly how it's implemented in the ipw2200 driver.
>>> Indeed, it's not the same!
>> perhaps a look at how it's done in wireless-tools may help?
>>
>> -- paolo
> 
> or in wpa_supplicant (see driver_ipw.c)
> 

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