On Thu, 2 Feb 2017 at 04:25, Marce= l Holtmann <marcel@holtmann.org> wrote:

Hi Carlo,

>>> ---
>>> tools/btattach.c | 10 +++++++++-
>>> 1 file changed, 9 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/tools/btattach.c b/tools/btattach.c
>>> index 5adbc8d..f1f115d 100644
>>> --- a/tools/btattach.c
>>> +++ b/tools/btattach.c
>>> @@ -194,6 +194,7 @@ static void usage(void)
>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "\t-P, --= protocol <proto> Specify protocol type\n"
>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "\t-S, --= speed <baudrate> Specify which baudrate to use\n"
>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "\t-N, --= noflowctl=C2=A0 =C2=A0 =C2=A0 =C2=A0 Disable flow control\n"
>>> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0"\t-D, -= -detach=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Open device and then fork\n= "
>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "\t-h, --= help=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Show help options\n=E2= =80=9D);
>>
>> And is this really a good idea. I think that I had removed all the= fork calls from the standard tools. Mainly since we fail to maintain the s= ignals and more important child signals correctly. So we quickly end up wit= h zombies or orphaned processes. My thinking instead was to leave this to s= ystemd to handle.
>
> Interesting. Any pointer how to achieve that?
> The problem is that I have btattach called by a systemd unit file to > download the firmware to the bluetooth transceiver. I also have
> another systemd unit that must be called strictly after btattach has > done uploading the firmware. Since btattach is hanging on the port
> AFAIU there is no way I can tell exactly when it is done uploading the=
> firmware. That's why I was adding this detach option, to mark the = unit
> as 'Type=3Dforking' and enforcing the ordering with
> 'Before=3Dnext.service`.
> Anything I am missing?

why do you need to know when the firmware uploading has completed? What har= dware is this?

The hardware is a custom ARM= board based on an Amlogic SOC.

More specifically I need btattach= systemd unit to run before systemd-rfkill. This is because the rfkill driv= er is actually driving the GPIO enable of the transceiver, so if systemd-rf= kill runs before btattach has completed telling to disable the radio (becau= se we rebooted with the BT off) this just interrupts the firmware downloadi= ng leaving the transceiver in a non-working state.