process._debugProcess(process.pid)
process._debugPause()
process._debugEnd()
process.debugPort : is getter and setter of debugport
See:
Commits:
https://github.com/joyent/node/commit/829735e738d34d880ba35c0e114cf9cff4dfedaf
https://github.com/joyent/node/commit/b0388ccad08ca94cd409dbf02996687770637fb8
https://github.com/joyent/node/commit/3f43b1c039727e12c7a27fb31010aa309a4a35d8