[Openslp-users] Registrations and server restarts

[Gavin L. <ga...@co...>]

Hi all,

I have a fairly simple test network setup at the moment with one Windows
machine and four Linux machines running OpenSLP (all with the same code,
which is one of the just-immediately-prior-to-release 2.0 betas); and there
are no DAs.  The four Linux machines all run the same app which is supposed
to have a permanent SLP registration.

Today I noticed while running an unrelated soak test (so everything had been
running for several hours, in some cases days) that two of the four machines
were no longer responding with the service info for that app.  The app is
still running, and slpd is still running.  However logs show that (at
different times) the slpd service on both of the affected machines shut down
and was restarted one second later, for no readily apparent reason.  (In
particular, the slpd.log appears to show a normal shutdown / startup banner,
but there's no other apparent cause for the restart.)

The app normally makes a single call to SLPReg on startup with
SLP_LIFETIME_MAXIMUM.  On rare occasions it'll call SLPReg again to change
one or more of its attributes.  Only when the app exits does it SLPDereg and
SLPClose.  No errors were returned from these APIs.

So, two points puzzle me:

1. why did slpd restart?
2. why, following the restart, didn't it reload the registration made
previously?

(For #2, I'm assuming the app shouldn't have to manually refresh the
registration since AFAIK it has no way to tell whether slpd has restarted or
not.)

If the assumption in #2 isn't valid, is there something the app should be
doing to keep this registration alive?  (Preferably without spamming SLPReg
or making it find itself.)