System.Posix.User.getAllUserEntries can be called only once

[Sascha Böhme]

Hello,

are there special constraints why the function

  System.Posix.User.getAllUserEntries

of the unix package can be called only once? Beginning with the second
call, it only returns the empty list. Thus, this function cannot be
used for a long running process which needs to query the user database
from time to time, again and again.

Thanks,
Sascha