Exercises

1. Write a tapset that implements deferred and ``cancelable'' logging. Export a function that enqueues a text string (into some private array), returning an id token. Include a timer-based probe that periodically flushes the array to the standard log output. Export another function that, if the entry was not already flushed, allows a text string to be cancelled from the queue.

2. Create a ``relative timestamp'' tapset with functions return all the same values as the ones in the timestamp tapset, except that they are made relative to the start time of the script.

3. Create a tapset that exports a global array that contains a mapping of recently seen process ID numbers to process names. Intercept key system calls (execve?) to update the list incrementally.

4. Send your tapset ideas to the mailing list!