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must first attach to the traced process. If the tracing process exits without detaching, the traced process will be killed rather than continued. For the duration of the tracing session, the traced process is reparented to the tracing process (with resulting expected behaviors). It is permissible to trace more than one other process at a time. When using waitpid() to monitor the behavior of the traced process, signals are intercepted: they may optionally then be forwarded using ptrace(). Signals are generated normally by and for the process, but also by the tracing facility (SIGTRAP). Product of: Suffering Sponsored by: DARPA, AFRL