xiaoxiang781216 opened a new pull request, #19182:
URL: https://github.com/apache/nuttx/pull/19182
## Summary
Add `getgroups()` to the C library. POSIX requires `getgroups()` to
return the supplementary group IDs of the calling process. NuttX has no
notion of supplementary group IDs, so the calling process is treated as
belonging to a single group: its effective group ID.
Behavior:
- gidsetsize == 0: return the number of group IDs (1) without writing to
grouplist, per POSIX.
- gidsetsize < 0: fail with EINVAL.
- otherwise: store the effective group ID (getegid()) in grouplist[0]
and return 1.
It is declared in <unistd.h> and always built, since it only depends on
the public getegid().
## Impact
New public POSIX API. No change to existing behavior or build for code
that does not call getgroups(). Helps porting third-party software that
expects getgroups() to be available.
## Testing
Built the sim:nsh configuration on Linux (x86_64, GCC) with
CONFIG_LIBC_GROUP_FILE both enabled and disabled. checkpatch.sh passes
on the changed files.
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