As far as I know the behavior of the utmpx functions are not defined by
POSIX either.
http://pubs.opengroup.org/onlinepubs/009696899/functions/endutxent.html
And on that page utmpx is marked as an XSI extension. To my understanding
those are optional and not required to be implemented in POSIX-compliant
software.
The situation is more complicated than that, but that's not really my
point. They have a defined behavior; THAT is my point.
And if every OTHER Unix implements these functions, what does that
really tell you?
--Ken
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