Re: ioctl arg passing

From: Matt (madmatt@bits.bris.ac.uk)
Date: Mon Apr 23 2001 - 17:09:44 EST


Matt mentioned the following:

| struct instruction_t {
| __s16 code;
| __s16 rxlen;
| __s16 *rxbuf;
| __s16 txlen;
| __s16 *txbuf;
| };

So far, I now know I can grab stuff across the user <-> kernel divide as I
planned. The only problem I'm left with, which was kindly pointed out to
me, is a question of packing with respect to both kernel & user-space.

Can anyone suggest a method of either assuring the above structure is
always packed the same, or alterations so that the problem is
minimised? Either splitting the one ioctl into many, etc.

Thanks

Matt

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Mon Apr 23 2001 - 21:00:47 EST