Re: open SHM data only after cgps start

[Hans Kurscheidt]

Yeah, but help me,

if I need something like gpsd running from cold boot, what shall I do in 
my app? Calling system("gpsd ....") during init ??


Am 05.02.2021 um 19:58 schrieb Frank Nicholas:
> Most people who have a long history with Unix do not like SystemD - it tries to 
> do too many things and does most of them poorly.  It often gets in the way - 
> THIS HAS BEEN ALL OF YOUR ISSUES.
>
> I avoid systems with it, if I can.
>
> Thanks,
> Frank
>
> > On Feb 5, 2021, at 1:56 PM, Hans Kurscheidt <lve0200@gmail.com> wrote:
> >
> > Hi,
> >
> > mails are crossing!
> >
> > Last question, I don't know what you mean with systemD (UMB) (UMCest) etc.
> >
> > RGDS
> >
> > hk
> >
> >
> > Am 05.02.2021 um 19:51 schrieb Gary E. Miller:
> > > Yo Hans!
> > >
> > > On Fri, 5 Feb 2021 18:52:19 +0100
> > > Hans Kurscheidt <lve0200@gmail.com> wrote:
> > >
> > > > I am now more than ever convinced that there's an issue in gpsd!
> > > I think Fred has the answer, he knows much more about systemd(umb) tha I do.
> > >
> > > > 1): fresh & clean boot; sudo lsof | grep /dev/ttyACM0 (my device
> > > > (ublox 6 via USB)) => nothing open.
> > > Not so fast.  As Fred said, systemd does not start gpsd until the
> > > first network client connection.  SHM connections are ignored by
> > > systemd(ubmer).
> > >
> > > You can verity this way:
> > >
> > > netstat -apn | fgrep :2947
> > >
> > >
> > > > 2) starting my app; sudo lsof | grep /dev/ttyACM0 (my device (ublox
> > > > 6)) => nothing open
> > > Ditto above.
> > >   
> > > > starting cgps in parallel; sudo lsof | grep /dev/ttyACM0
> > > > gpsd        700           nobody    9u      CHR      166,0 0t0
> > > > 14619 /dev/ttyACM0
> > > >
> > > > my app starts to receive data as well, like cgps.
> > > Ditto above.  Fred explained this.
> > >
> > > > after a while, my app does not receive anymore data (most likely when
> > > > buffer has become empty); sudo lsof | grep /dev/ttyACM0 (my device
> > > > (ublox 6)) => nothing open.
> > > No.  Systemd(umbest) say no network connections and killed gpsd.
> > >
> > > RGDS
> > > GARY
> > > ---------------------------------------------------------------------------
> > > Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
> > >         gem@rellim.com  Tel:+1 541 382 8588
> > >
> > >             Veritas liberabit vos. -- Quid est veritas?
> > >      "If you can't measure it, you can't improve it." - Lord Kelvin