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/** @dir test4
This example probe tracks file opens, reads and writes.
It demonstrates maps, stats, and iterators.
This is a translation of on an old dtr probe. Original source is
\verbatim
global {
long @opens[string];
sum @reads[string], @writes[string];
}
probe sys_open:entry {
@opens[current->comm]++;
}
probe sys_read:entry {
@reads[current->comm] << count;
}
probe sys_write:entry {
@writes[current->comm] << count;
}
\endverbatim
*/
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