I think I've found what I was after with xautolock Debian package or BSD's xidle.c which seems to implement the MIT-SCREEN-SAVER API with the help of x11proto-scrnsaver-dev Debian package.
by
alex789
2008-01-10 02:35
xscreensaver
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MIT-SCREEN-SAVER
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API
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xidle
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screensaver