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Try to diagnose errors due to Ubuntu's ptrace_scope sysctl.
Check for Linux in an #ifdef for clarity.
Break out prototypes into a header file.
Better error reporting if attaching to a child fails.
Add a minimal usage message.
Improve error-reporting on attach failures somewhat.
Remove superfluous define of _XOPEN_SOURCE.
Checkpoint working version.
Checkpoint attach work-in-progress.
Initial import. Mostly able to run barnowl.