Proposal: check and read /etc/{passwd,group} less frequently.

[Kazuhiro Fujieda]

I feel that there is no need to check and read
/etc/{passwd,group} on every getpw* and getgw* functions.

Is it enough frequent that the check is held only in internal_getlogin?
If so, read_etc_{passwd,group} don't need to support multi threads
and can be more simple.
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  | AIST      Kazuhiro Fujieda <fujieda@jaist.ac.jp>
  | HOKURIKU  Center for Information Science
o_/ 1990      Japan Advanced Institute of Science and Technology