[Ns-bugs] [Bug 416] New: pcap traces not always closing cleanly at simulation end

[code@nsnam.ece.gatech.edu]

http://www.nsnam.org/bugzilla/show_bug.cgi?id=416

           Summary: pcap traces not always closing cleanly at simulation end
           Product: ns-3
           Version: ns-3-dev
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P3
         Component: helpers
        AssignedTo: craigdo at ee.washington.edu
        ReportedBy: tomh at tomh.org
                CC: ns-bugs at isi.edu
   Estimated Hours: 0.0


Created an attachment (id=308)
 --> (http://www.nsnam.org/bugzilla/attachment.cgi?id=308)
start of a patch to fix this

I noticed some non-deterministic output in the pcap tracing while debugging
something else, and I tracked it down to the fact that the destructor for
PcapWriter is not being called in most cases, and the ofstream is not being
flushed and closed.  

I saw some support in InternetStackHelper for scheduling a SimulatorDestroy()
event to cleanup and close these ofstreams.  However, there are two problems
that I see with that particular support:
- it tries to cause the destructor to be invoked by zeroing the smart pointer,
but my testing suggests that this is not sufficient (hence I added an explicit
Close() method in the attached patch)
- it only covers the case when EnablePcapAll() has been selected, but not when
Pcap is enabled with finer granularity.

Attached is a start of a patch to try to fix this behavior, but it would need
to be extended to all NetDevices (esp. WifiNetDevice) and it would need to
cover all of the entry points into Pcap tracing (rather than just
EnablePcapAll()).


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