Felix-KM wrote:
I think that could work (only an idea, not tested):
struct Region
{
void * p;
size_t s;
};
#define IOBIG _IOWR ('b', 123, struct Region)
userland:
char data[1000];
struct Region r;
r.p = data;
r.s = sizeof data;
int error = ioctl (fd, IOBIG, &r);
kernel:
int my_ioctl(..., caddr_t data, ...)
{
...
char data[1000];
...
return copyout(data, ((struct Region *) data)->p, ((struct Region *)
data)->s);
}
Have a try and tell us if it works.
Norbert
Yes! Now the program works!
I have changed the code in this way:
struct Region
{
void * p;
size_t s;
};
#define IOBIG _IOWR ('b', 123, struct Region)
Unless your ioctl handler is going to modify values in the Region struct
and pass them back out to userland, you should just use _IOR instead of
_IORW.
Scott
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