Re: [Bluez-users] hci_inquiry problem

Thinking a bit more, I found the difference in the structure sizes due 
to a mismatch with arm abi/eabi interfaces (gcc mabi apcs-gnu/aapcs 
option). Probably only a my compiler version specific issue.

     Giulio Fedel

giulio fedel wrote:

Hi,
I'm working on an arm embedded system. It turn out that hci_inquiry in 
hci.c (libs) calls

--> buf = malloc(sizeof(*ir) + (sizeof(inquiry_info) * (nrsp)))
...
--> ioctl(dd, HCIINQUIRY, (unsigned long) buf)
...

My problem is that sizeof(struct hci_inquiry_req) is not the same in 
kernel space and in user space (nothing strange), so when in the kernel 
driver in hci_core.c we do:

--> hci_inquiry_req * ir;
...
--> ptr += sizeof(ir);
--> copy_to_user(ptr, buf, sizeof(struct inquiry_info) * ir.num_rsp)

and in the library code (hci_inquiry)

--> hci_inquiry_req * ir;
...
--> memcpy((void *) *ii, buf + sizeof(*ir), size);

the things do not work as aspected.
I solved my problem with __attribute__ ((packed)) in hci.h
in the kernel tree (include/net/bluetooth/) and in the library
(include/hci.h).

Regards.

     Giulio Fedel

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