[Bluez-users] nonblocking socket

[Bluez-users] nonblocking socket

[Jeff Wilson]

I am using bluez-libs-2.25 on 2.6.11-mh2 to develop BlueZ support for
a multithreaded process.  My BlueZ contribution opens a non-blocking
RFCOMM socket in one thread, and blocking SDP query in another.  So
far, I have RFCOMM support working, and I have also integrated
Bluetooth inquiry and SDP queries.

When I set RFCOMM to nonblocking, the sdp_connect returns an error,
with errno set to EALREADY.  Why does one thread affect the other?

This same SDP query worked fine before I change the RFCOMM to nonblocking.

I can provide hcidump or source code if needed.

    Thanks,
       Jeff

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Re: [Bluez-users] nonblocking socket

[Marcel Holtmann]

Hi Jeff,

> I am using bluez-libs-2.25 on 2.6.11-mh2 to develop BlueZ support for
> a multithreaded process.  My BlueZ contribution opens a non-blocking
> RFCOMM socket in one thread, and blocking SDP query in another.  So
> far, I have RFCOMM support working, and I have also integrated
> Bluetooth inquiry and SDP queries.
> 
> When I set RFCOMM to nonblocking, the sdp_connect returns an error,
> with errno set to EALREADY.  Why does one thread affect the other?
> 
> This same SDP query worked fine before I change the RFCOMM to nonblocking.

can you provide a simple test program for this? It sounds like a strange
bug with threading. However why do you need a non-blocking socket when
you are using threading?

Regards

Marcel



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Re: [Bluez-users] nonblocking socket

[Jeff Wilson]

I will put together an example and post it in the next day or two.  As
to "why nonblocking?" it's to service multiple sockets with a single
thread (event-based approach).

Thanks,
Jeff

On 8/3/06, Marcel Holtmann <marcel@holtmann.org> wrote:
> Hi Jeff,
>
> > I am using bluez-libs-2.25 on 2.6.11-mh2 to develop BlueZ support for
> > a multithreaded process.  My BlueZ contribution opens a non-blocking
> > RFCOMM socket in one thread, and blocking SDP query in another.  So
> > far, I have RFCOMM support working, and I have also integrated
> > Bluetooth inquiry and SDP queries.
> >
> > When I set RFCOMM to nonblocking, the sdp_connect returns an error,
> > with errno set to EALREADY.  Why does one thread affect the other?
> >
> > This same SDP query worked fine before I change the RFCOMM to nonblocking.
>
> can you provide a simple test program for this? It sounds like a strange
> bug with threading. However why do you need a non-blocking socket when
> you are using threading?
>
> Regards
>
> Marcel
>
>
>
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Re: [Bluez-users] nonblocking socket

[Jeff Wilson]

Never mind on the example program, no need to create one, I can
reproduce the problem with sdptool v2.25:

`sdptool browse <remote-addr>`

Failed to connect to SDP server on <remote-addr>: Operation already in progress

local hcidump -X -V

HCI sniffer - Bluetooth packet analyzer ver 1.30
device: hci0 snap_len: 1028 filter: 0xffffffff
< HCI Command: Create Connection (0x01|0x0005) plen 13
    bdaddr remote-addr ptype 0xcc18 rswitch 0x01 clkoffset 0x0000
    Packet type: DM1 DM3 DM5 DH1 DH3 DH5
> HCI Event: Command Status (0x0f) plen 4
    Create Connection (0x01|0x0005) status 0x0b ncmd 1
    Error: ACL Connection Already Exists

remote hcidump -X -V

(nothing)

Any ideas?  I have rebooted the client since this started up.  Thanks
for your time.

       Regards,
          Jeff

On 8/3/06, Jeff Wilson <jazzbotley@gmail.com> wrote:
> I will put together an example and post it in the next day or two.  As
> to "why nonblocking?" it's to service multiple sockets with a single
> thread (event-based approach).
>
> Thanks,
> Jeff
>
> On 8/3/06, Marcel Holtmann <marcel@holtmann.org> wrote:
> > Hi Jeff,
> >
> > > I am using bluez-libs-2.25 on 2.6.11-mh2 to develop BlueZ support for
> > > a multithreaded process.  My BlueZ contribution opens a non-blocking
> > > RFCOMM socket in one thread, and blocking SDP query in another.  So
> > > far, I have RFCOMM support working, and I have also integrated
> > > Bluetooth inquiry and SDP queries.
> > >
> > > When I set RFCOMM to nonblocking, the sdp_connect returns an error,
> > > with errno set to EALREADY.  Why does one thread affect the other?
> > >
> > > This same SDP query worked fine before I change the RFCOMM to nonblocking.
> >
> > can you provide a simple test program for this? It sounds like a strange
> > bug with threading. However why do you need a non-blocking socket when
> > you are using threading?
> >
> > Regards
> >
> > Marcel
> >
> >
> >
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> >
>

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Re: [Bluez-users] nonblocking socket

[Jeff Wilson]

No, I'm not directly creating HCI connections.  I use
socket(...,BTPROTO_RFCOMM) and then use that fd with read()/write()

On a hunch, I rebuilt my bluez-lib from the 2.25 tgz, re-installed,
then restarted hcid, sdpd, etc.  I can now use sdptool without error.

I guess libbluetooth got corrupted by a power-interruption reset?

Thanks for the feedback.  Sorry for the noise.

        Best regards,
          Jeff

On 8/3/06, Marcel Holtmann <marcel@holtmann.org> wrote:
> Hi Jeff,
>
> > Never mind on the example program, no need to create one, I can
> > reproduce the problem with sdptool v2.25:
> >
> > `sdptool browse <remote-addr>`
> >
> > Failed to connect to SDP server on <remote-addr>: Operation already in progress
> >
> > local hcidump -X -V
> >
> > HCI sniffer - Bluetooth packet analyzer ver 1.30
> > device: hci0 snap_len: 1028 filter: 0xffffffff
> > < HCI Command: Create Connection (0x01|0x0005) plen 13
> >     bdaddr remote-addr ptype 0xcc18 rswitch 0x01 clkoffset 0x0000
> >     Packet type: DM1 DM3 DM5 DH1 DH3 DH5
> > > HCI Event: Command Status (0x0f) plen 4
> >     Create Connection (0x01|0x0005) status 0x0b ncmd 1
> >     Error: ACL Connection Already Exists
>
> can you test it with latest 2.6.17-mh5 kernel?
>
> This error indicates that an ACL already exists. Are you playing with
> HCI connection creation from userspace? If you do so, then don't.
>
> Regards
>
> Marcel
>
>
>
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Re: [Bluez-users] nonblocking socket

[Marcel Holtmann]

Hi Jeff,

> Never mind on the example program, no need to create one, I can
> reproduce the problem with sdptool v2.25:
> 
> `sdptool browse <remote-addr>`
> 
> Failed to connect to SDP server on <remote-addr>: Operation already in progress
> 
> local hcidump -X -V
> 
> HCI sniffer - Bluetooth packet analyzer ver 1.30
> device: hci0 snap_len: 1028 filter: 0xffffffff
> < HCI Command: Create Connection (0x01|0x0005) plen 13
>     bdaddr remote-addr ptype 0xcc18 rswitch 0x01 clkoffset 0x0000
>     Packet type: DM1 DM3 DM5 DH1 DH3 DH5
> > HCI Event: Command Status (0x0f) plen 4
>     Create Connection (0x01|0x0005) status 0x0b ncmd 1
>     Error: ACL Connection Already Exists

can you test it with latest 2.6.17-mh5 kernel?

This error indicates that an ACL already exists. Are you playing with
HCI connection creation from userspace? If you do so, then don't.

Regards

Marcel



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