One Hat Cyber Team
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systemtap
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examples
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Edit File:
dropwatch.stp
#!/usr/bin/stap ############################################################ # Dropwatch.stp # Author: Neil Horman <nhorman@redhat.com> # An example script to mimic the behavior of the dropwatch utility # http://fedorahosted.org/dropwatch ############################################################ # Array to hold the list of drop points we find global locations # Note when we turn the monitor on and off probe begin { printf("Monitoring for dropped packets\n") } probe end { printf("Stopping dropped packet monitor\n") } # increment a drop counter for every location we drop at probe kernel.trace("kfree_skb") { locations[$location] <<< 1 } # Every 5 seconds report our drop locations probe timer.sec(5) { printf("\n%s\n", ctime(gettimeofday_s())) foreach (l in locations-) { printf("%d packets dropped at %s\n", @count(locations[l]), symdata(l)) } delete locations }
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