/* Perform binary difference on all monitored ranges */
void check_monitored_ranges()
{
/* incremental update */
for(MemIntervalSet::const_iterator i=persistent.begin(); i!=persistent.end(); ++i)
{
/* Check whether range is already stored */
FlightRecStorage::iterator j = stored.find(*i);
if(j == stored.end())
{
/* Not in storage at all, write whole block. */
//printf("Not in storage at all, write whole block.\n");
write_mem_range(i->start, i->end);
/* Copy memory block to newly allocated storage,
* so that we can compare against it later. */
void *block = malloc(i->end - i->start);
memcpy(block, (void*)i->start, i->end - i->start);
stored.insert(std::make_pair(*i, block));
} else {
if(j->first.start != i->start || j->first.end != i->end)
{
/* Huh? Not exactly the same range, could do an intersection here but
* currently this is not supported, write the entire range */
//printf("Warning: stored block mismatch start1=%p start2=%p end1=%p end2=%p\n", j->first.start, i->start, j->first.end, i->end);
write_mem_range(i->start, i->end);
} else {
/* compare ranges and write differences */
/* copy new values to storage */
bdiff((size_t)j->second, i->start, i->end - i->start, diff_granularity);
memcpy(j->second, (void*)i->start, i->end - i->start);
}
}
}
}
~FlightRecorder()
{
if(valid)
{
close(fd);
pthread_mutex_destroy(&mutex);
// Free comparison blocks in stored
for(FlightRecStorage::iterator i=stored.begin(); i!=stored.end(); ++i)
{
free(i->second);
}
}
}
