> Hello!
>
> I have:
>
> int ziva_ioctl(dev_t dev, u_long cmd, caddr_t arg, int flag, struct
> proc* pr)
>
> when this function catches a ioctl from userspace, called as:
> int foo = 199;
> ioctl(fd, 10, &foo);
>
> the u_long cmd contains 10, which is correct (so the ioctl-handler is
> called correctly).
>
> However, I can't get the value of the int.
>
> I tried something like:
> if (*((int *) arg) == 199)
> <bleh>.
>
> But this doesn't work, <bleh> is not executed. Somehow, I can't access
> the memory this way.
>
> Anyone knows, what I'm doing wrong?
The request parameter to ioctl needs to contain length information.
I think you want something like:
#define ZIVA_IOCTL _IOW('c', 10, int)
int foo = 199;
ioctl(fd, ZIVA_IOCTL, &foo);
Then arg should be right. See iocomm.h.
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