getgrent_r & getpwent_r are curious relics whose names imply they'd be thread-safe, but which have internal iterator state making them no better than getgrent & getpwent.
Today in brilliantly non-portable: reimplementing getgrouplist in terms of getgrent_r because the former is "not portable" (neither is and the latter is broken-by-design). https://sourceforge.net/p/opensaf/code/ci/develop/tree/src/base/osaf_secutil.c#l371 …
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