Track supplementary GIDs per task group, wire setgroups/getgroups
syscalls when CONFIG_SCHED_NGROUPS > 0, and honor them in DAC checks
via nxsched_has_gid(). When NGROUPS is 0, libc provides getgroups/
setgroups stubs. initgroups() fails instead of silently truncating
when membership exceeds CONFIG_SCHED_NGROUPS.
Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>
Add getgroups() to the C library. NuttX has no supplementary group
IDs, so it reports a single group, the effective group ID, and follows
POSIX for the gidsetsize == 0 and short-buffer (EINVAL) cases.
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
