Re: Unexpected logging from gpsd

[Gary E. Miller]

Yo Mick!

On Sun, 10 Oct 2021 15:45:58 +0100
Mick Durkin <mickdurkinuk@gmail.com> wrote:

> That still leaves me unclear why gpsd is outputting debug data all
> the time.

All the time?  I thought you said only for PPS stuff?

> When we want debugging to be active we specify the level
> with the -D n option at startup.

Yes.

> This output is only coming from the
> ppsthread code within gpsd, so why would that code be different?

As the name says, the PPS code is in a thread.  C code in a thread has
to be written differently than non-threaed C code because C is not
inherently safe with threads.

Alsoat all the gpsd code uses GPSD_LOG() for logging.  But to avoid
I/O and buffer contention, the PPS thread code uses pps_thread->log_hook().

log_hook() points to ppsthread_log90 in gpsd/libgpsd_core.c

It uses similar log levels to GPSD_LOG():

log_hook() levels:

#define THREAD_ERROR    0
#define THREAD_WARN     1
#define THREAD_INF      2
#define THREAD_PROG     3
#define THREAD_RAW      4

GPSD_LOG() levels:

/* logging levels */
#define LOG_ERROR       -1      /* errors, display always */
#define LOG_SHOUT       0       /* not an error but we should always see it */
#define LOG_WARN        1       /* not errors but may indicate a problem */
#define LOG_CLIENT      2       /* log JSON reports to clients */
#define LOG_INF         3       /* key informative messages */
#define LOG_PROG        4       /* progress messages */
#define LOG_IO          5       /* IO to and from devices */
#define LOG_DATA        6       /* log data management messages */
#define LOG_SPIN        7       /* logging for catching spin bugs */
#define LOG_RAW         8       /* raw low-level I/O */
#define LOG_RAW1        9       // rawer
#define LOG_RAW2       10       // rawest

If you are getting debug level logs from log_hook() and not from GPSD_LOG()
then that points to some problem in log_hook() decding what to send
to the logs.

I'd still like the output of gpsdebuginfo.

https://gpsd.io/gpsdebuginfo

And be sure that all traces of any previous gpsd installation have been
removed and that you started your build from a clean tree.


RGDS
GARY
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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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