F Routines that have not been implemented

This is an alphabetical list of POSIX routines that have been considered for implementation as PSX routines and have been rejected as unnecessary. Any routine that has not been implemented, yet is not in the following list has simply not yet been looked at and may well be done in the future.

If you have a need for any routine that has not been implemented, for whatever the reason, then please contact the author of this document, who will endeavour to change this.

GETGROUPS

Get the supplementary group IDs of the calling process
SETGID

Sets the real and effective group ID
SETUID

Sets the real and effective user ID