GitLab

Added ping error handling: timeout, ttl exceeded, and unknown.
 Values returned to ops are negative numbers. The meanings of these
 is listed in the top section of bgmon.pl
Note, that these changes have not been tested but were not complex.
testing is a definite TODO.

Commit the option I added to runbgmon/bgmon.pl that allows you to specify
which port iperf is to use (-i <port>).  Also fix a minor issue with latency
and bandwidth period option parsing.

Changes to bgmon and friends to allow specification of an alternate experiment
to listen/send with (expt event field).  This defaults to "__none".  I also
put in options for specifying bandwidth and latency periods, and generally
fixed up option parsing.

The runbgmon script has also been changed to autodetect the pid/eid and pass
this to bgmon.  You can override this with the "-e" switch.

* opsrecv sends an ack back to bgmon for each packet it receives.

* Rework caching code a bit, and rearrange slightly to deal with acks.

Note that opsrecv does not deal with duplicates yet ... still thinking
about that, but it actually does not matter too much if the info gets
duplicated in the DP; multiple entries with the same data and the same
timestamp *should* be harmless.

See:     #MARK_RELIABLE  sections

and libraries.