RTEMS 4.9.3 On-Line Library

Process Environment Manager getgroups - Get Supplementary Group IDs

RTEMS POSIX API User's Guide

int getgroups(
  int    gidsetsize,
  gid_t  grouplist[]
);

This service is not implemented as RTEMS has no notion of supplemental groups.

If supported, this routine would only be allowed for the super-user.

RTEMS POSIX API User's Guide