[Bluez-users] Exactly how the sockets are being used in between the user space and kernel?

["vaishali paisal" <vaishalipaisal@rediffmail.com>]

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  Hello Marcel,
Thanks for replying to my question.Can u please explain me how the socket communication is going on between the user space and kernel space?
I can find out the code defining new address familiy AF_BLUETOOTH.then new protocols for L2CAP,HCI and RFCOMM.
in bluez utilities i can find that in files like l2test.c the calls are being made to socket functions.
But i m unable to find out exactly how the other side i mean the kernel handles the socket calls.
If u can provide a sample code just expalining the socket concept i  would be grateful to u.

Regards
vaishali


On Tue, 05 Apr 2005 Marcel Holtmann wrote :
>Hi,
>
> > I have a small problem in understanding the blueZ source code for
> > kernel 2.6.11.I am unable to find out exactly how the kernel
> > implementations of the l2cap layer,hcilayer and rfcomm layer are
> > interacting amongst themselves ?As well as how they interact with the
> > user space libraries?
> >
> > I have seen some functions in l2cap.c calling functions from
> > hci_core.c which have been put as EXPORT_SYMBOL() in hci_core.c.
> > Is it the way they are communicating or am i missing something?
>
>the module interaction is done by the exported symbols as you already
>realized. The upper layer modules like RFCOMM, BNEP etc. are using the
>L2CAP socket interface inside the kernel. All userspace tools are using
>the ioctls and the socket interfaces.
>
>Regards
>
>Marcel
>
>
>
>
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