Re: open SHM data only after cgps start

[Hans Kurscheidt]

Hi there,

>

At a guess, you have a systemd unit file for gpsd that does not start
gpsd, but only listens for a client to connect

<

If I'm not totally lucking LINUX knowledge, the statement below shows 
clearly that gpsd is running as a process (718), isn't it??

hk@orangepizero:~$ systemctl status gpsd
● gpsd.service - GPS (Global Positioning System) Daemon
   Loaded: loaded (/etc/systemd/system/gpsd.service; enabled; vendor 
preset: enabled)
   Active: active (running) since Fri 2021-02-05 20:04:03 CET; 53s ago
 Main PID: 718 (gpsd)
    Tasks: 2 (limit: 4915)
   CGroup: /system.slice/gpsd.service
           └─718 /usr/sbin/gpsd -N -n /dev/ttyACM0

Feb 05 20:04:03 orangepizero systemd[1]: Started GPS (Global Positioning 
System) Daemon.
hk@orangepizero:~$ ps -ef | grep gpsd
nobody     718     1  0 20:04 ?        00:00:00 /usr/sbin/gpsd -N -n 
/dev/ttyACM0

I therefore don't understand your statement.

Here's the UNIT file

[Unit]
Description=GPS (Global Positioning System) Daemon
Requires=gpsd.socket
# Needed with chrony SOCK refclock
#After=chronyd.service

[Service]
EnvironmentFile=-/etc/default/gpsd
EnvironmentFile=-/etc/sysconfig/gpsd
ExecStart=/usr/sbin/gpsd -N $GPSD_OPTIONS $DEVICES

[Install]
WantedBy=multi-user.target
Also=gpsd.socket


in the config file $GPSD_OPTIONS is "-n" and $DEVICES is "/dev/ttyACM0"

BR

hk


Am 06.02.2021 um 11:58 schrieb shouldbe q931:
> On Sat, Feb 6, 2021 at 10:43 AM Hans Kurscheidt <lve0200@gmail.com> wrote:
> > Bonjour Gary,
> >
> > What does not look correct to you?
> >
> > <
> >
> > As you can see, the unliked systemd starts gpsd w/ or w/out "-n" at boot. 4me therefore, 
> > systemd is not the culprit, but obviously I luck deeper understanding of the gpsd internals. 
> > However I would guess that gpsd, once started from systemd would wait for an "open" from 
> > some application wanting GPS data,
> A gpsd client and using SHM are two different things
>
> At a guess, you have a systemd unit file for gpsd that does not start
> gpsd, but only listens for a client to connect
>
> <snipped for brevity>
>
> If you posted your systemd unit file, those of us that use systemd
> might be able to help you resolve your issue.
>
> Cheers