Fastest way by far:

• seek() to a position, relative to end-of-file, that you are quite sure is long enough to fit. ...
• Read a string starting from that position.
• Use a regex anchored at end-of-string to carve off the last three digits, e.g. /(\d+)\n(\d+)\n(\d+)$/ this assuming there are no whitespaces.
• The numbers you want are $1, $2, $3. (If they aren't, then die() because your assumption about "what you are quite sure is long enough" wasn't.)

You don't need to slog through an arbitrarily-long random access file just to find out what's at the end of it.

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