ioctl(RFCOMMCREATEDEV) failed: File descriptor in bad state

ioctl(RFCOMMCREATEDEV) failed: File descriptor in bad state

[Zhang, Zhenhua]

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Re: ioctl(RFCOMMCREATEDEV) failed: File descriptor in bad state

[Marcel Holtmann]

Hi,

> I am calling ioctl(RFCOMMCREATEDEV) to create tty device from a rfcomm fd 
> using hands-free profile. If the HF send connection request to AG and make
> rfcomm connect, the tty could be made successfully. However, if the 
> AG(mobile) side make request to create rfcomm connection, the rfcomm could
> be created but fail to create the tty device. The kernel returns error 
> because socket is not connected, see below code. Any idea? Thanks much!

why do you wanna create the TTY in the first place? Going via the TTY
layer is pretty bad idea. Don't even think about doing that. Use the
RFCOMM socket.

Regards

Marcel

RE: ioctl(RFCOMMCREATEDEV) failed: File descriptor in bad state

[Zhang, Zhenhua]

Hi Marcel,

Marcel Holtmann wrote:
> Hi,
> 
>> I am calling ioctl(RFCOMMCREATEDEV) to create tty device from a
>> rfcomm fd using hands-free profile. If the HF send connection
>> request to AG and make rfcomm connect, the tty could be made
>> successfully. However, if the AG(mobile) side make request to create
>> rfcomm connection, the rfcomm could be created but fail to create
>> the tty device. The kernel returns error because socket is not
>> connected, see below code. Any idea? Thanks much! 
> 
> why do you wanna create the TTY in the first place? Going via the TTY
> layer is pretty bad idea. Don't even think about doing that. Use the
> RFCOMM socket.
> 
> Regards
> 
> Marcel

I want to create TTY and expose it to Ofono as /dev/rfcomm0. Ofono side 
could treat bluetooth connection as a TTY device, and create 
GAtChat *chat by using g_at_chat_new_from_tty(tty, syntax).

Regards,
Zhenhua

RE: ioctl(RFCOMMCREATEDEV) failed: File descriptor in bad state

[Marcel Holtmann]

Hi,

> >> I am calling ioctl(RFCOMMCREATEDEV) to create tty device from a
> >> rfcomm fd using hands-free profile. If the HF send connection
> >> request to AG and make rfcomm connect, the tty could be made
> >> successfully. However, if the AG(mobile) side make request to create
> >> rfcomm connection, the rfcomm could be created but fail to create
> >> the tty device. The kernel returns error because socket is not
> >> connected, see below code. Any idea? Thanks much! 
> > 
> > why do you wanna create the TTY in the first place? Going via the TTY
> > layer is pretty bad idea. Don't even think about doing that. Use the
> > RFCOMM socket.
>
> I want to create TTY and expose it to Ofono as /dev/rfcomm0. Ofono side 
> could treat bluetooth connection as a TTY device, and create 
> GAtChat *chat by using g_at_chat_new_from_tty(tty, syntax).

and that is just wrong to begin with. Write an oFono plugin that uses
Bluetooth RFCOMM sockets directly. I really don't understand why you
wanna make your life so complicated. Within oFono you have to do a
non-blocking RFCOMM connect() anyway using GIOChannel. And once you have
the GIOChannel you can just hand it to g_at_chat_new(). Plain and
simple. Just extend modemconf.c to support a "bluetooth" driver and then
you can even configure address and channel.

Regards

Marcel