Libmonitor: A tool for first-party monitoring

Libmonitor is a library that provides hooks into a program and provides callback functions for monitoring the begin and end of processes and threads and maintains control across fork, exec and in the presence of signals. It provides a layer on which to build first-party profiling tools for performance or correctness. Libmonitor is lightweight, fully scalable, easy to use and does not require access to an application’s source code.