xiaoxiang781216 opened a new pull request, #19183:
URL: https://github.com/apache/nuttx/pull/19183
## Summary
Add `getgrouplist()` to the C library. It scans the group database for
a user's supplementary groups and always reports the primary group
(passed by the caller) first.
- With CONFIG_LIBC_GROUP_FILE, the group file is scanned and every group
whose member list contains the user is appended, skipping the primary
group to avoid duplicates.
- Without CONFIG_LIBC_GROUP_FILE, only the primary group is returned,
since no membership information is available.
- *ngroups is updated with the number of groups found; when the caller
buffer is too small the function returns -1 with *ngroups set to the
required count, following glibc.
The group file is read through lib_get_tempbuffer()/lib_put_tempbuffer()
to avoid a heap allocation on every lookup.
## Impact
New GNU/BSD API declared in <grp.h>. No change to existing behavior or
build for code that does not call getgrouplist(). Helps porting
third-party software that expects getgrouplist() to be available.
## Testing
Built the sim:nsh configuration on Linux (x86_64, GCC) with
CONFIG_LIBC_GROUP_FILE both enabled and disabled, and exercised
getgrouplist() against a crafted /etc/group with a user in multiple
groups (correct count and gid list; -1 with required count on a
too-small buffer). checkpatch.sh passes on the changed files.
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