Yo Hal! Let me make a quick retraction below:
> On Mon, 16 Sep 2019 14:09:45 -0700
> Hal Murray <hmur...@megapathdsl.net> wrote:
>
> > I think we should put the current stuff on the back burner and make
> > a new SHM interface where the clients are read only.
>
> ntpshmmon, from gpsd, is already read-only on the SHMs.
Double checking the gpsd/ntpshmread.c file, in ntp_read(), I
see that the code support read only and read-write.
/*
* An update consumer such as ntpd should zero the valid flag at this point.
* A program snooping the updates to collect statistics should not, lest
* it make the data unavailable for consumers.
*/
if (consume)
shm->valid = 0;
In gpsd only ntpshmmon uses ntp_read() and it dhas consume == false.
So you are correct that some clients may use the SHM protocol in
rw mode. Can't imagine why...
RGDS
GARY
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