Re: [Bluez-users] Timeout for connections

[Marcel Holtmann <marcel@holtmann.org>]

Hi Mikael,

> > > I would like to be able to set a timeout for service discoveries (and
> > > eventually for rfcomm connections as well, but so far I've been
> > > experimenting with service discoveries). For this I use non blocking
> > > sockets by passing SDP_NON_BLOCKING to sdp_connect. Then I use select
> > > with a timeout on the socket, and if it times out I call sdp_close.
> > >
> > > The problem is that after I have done this I can't use the bluetooth
> > > chip for other connections for some time. Dumping the traffic with
> > > hcidump, I saw that this is because even though the l2cap socket is
> > > closed, the bluetooth chip is still doing the connection in the
> > > background. For this connection to actually get canceled the chip
> > > needs to be sent a HCI_Create_Connection_Cancel command, but it is not
> > > sent when the socket is closed.
> >
> > use a 2.6.19 kernel and this command will be sent.
> >
> 
> Oh ok... Haven't had to build my own kernel before but I guess there
> is a first time for everything... I'm using ubuntu and they say it
> won't be available until next version in april... Problem is that
> there are people who I can't tell "build the latest kernel" who relies
> on the software I'm developing... what to do...

there is a chance that Fedora Core will update their kernel to 2.6.19
very soon. Otherwise you are out of luck.

> Is there another way I can set a timeout for connections?

No. Only the kernel can keep track of connections. If you try to do it
by yourself in userspace you will break more than you fix. The reference
count for the ACL link is tricky and only the kernel has all needed
information to do it right.

Regards

Marcel



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