Re: open SHM data only after cgps start

[Gary E. Miller]

Yo Frank!

+1

On Fri, 5 Feb 2021 10:40:30 -0500
Frank Nicholas <frank@nicholasfamilycentral.com> wrote:

> I think you have two issues:
> 1. Dirty system with multiple installations of various versions of
> GPSd 2. You are using SystemD, which with the most common service
> file, only launched GPSd when an app/client attempts to attach.  As
> long as GPSd is launched, and there is an attached client/consumer,
> it will continue to run, until there is nothing else using it and the
> last client closes the connection.
> 
> Gary Miller suggested adding the switch to make GPSd run as a daemon
> all the time (doesn’t exit when there are no clients attached).  This
> would also require something to change with the SystemD config file -
> you want SystemD to start GPSd at boot, not wait until there’s a
> client attempting to access it.  I think Gary even provided a one
> line command line that could be put in a startup script, anywhere you
> wanted, depending on the flavor of Linux you are using (this would
> not use SystemD).
> 
> For some reason all your messages are coming individually - not
> recognized as part of a discussion/thread.  Not sure if you can do
> something about that, but it makes it difficult to follow - that’s
> why I couldn’t easily find Gary’s suggestions.
> 
> Thanks,
> Frank
> 
> > On Feb 5, 2021, at 8:59 AM, Hans Kurscheidt <lve0200@gmail.com>
> > wrote:
> > 
> > Sorry, if I keep talking to myself here, but I'm crawling forward.
> > 
> > After I got gpsd running as service, I cleaned out all old
> > references to libgps and libgps-dev and cleaned Visual Studio's
> > cache.
> > 
> > Should be OK now.
> > 
> > There's no dpkg -l libgps* output anymore
> > 
> > VisualStudio finds the richgt gps.h under ../gpsd-master/..; there
> > is no other gps.h somewhere.
> > 
> > and the linker points to so.28
> > 
> > ldconfig -p | grep gps
> >         libgpsdpacket.so.28 (libc6,hard-float) =>
> > /usr/local/lib/libgpsdpacket.so.28 libgpsdpacket.so
> > (libc6,hard-float) => /usr/local/lib/libgpsdpacket.so libgps.so.28
> > (libc6,hard-float) => /usr/local/lib/libgps.so.28 libgps.so
> > (libc6,hard-float) => /usr/local/lib/libgps.so libQgpsmm.so.28
> > (libc6,hard-float) => /usr/local/lib/libQgpsmm.so.28 libQgpsmm.so
> > (libc6,hard-float) => /usr/local/lib/libQgpsmm.so
> > 
> > The compilation/linking is OK w/out errors or warnings and the
> > executable is runable
> > 
> > BUT, I still have the old problem. (assume gpsd service running and
> > fix available)
> > 
> > If I run my app after boot, No gps data is available and just once
> > I got an error message, which I cannot reproduce, saying something
> > like:
> > 
> > shared library error cannot ... data: No such file or directory
> > 
> > After running cgps once, data is available and remains 2b supplied
> > to my app, even if I close cgps. This is reproduceable.
> > 
> > RGDS
> > 
> > hk
> > 
> >   
> 
> 




RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  Tel:+1 541 382 8588

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    "If you can't measure it, you can't improve it." - Lord Kelvin

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