getgrent_r
int getgrent_r(struct group *, char *, size_t, struct group **);
return (getgrent_r(grp, buffer, bufsize, res));
getgrent_r(grp, buffer, bufsize, result)
getgrent_r(&sts, bufs, sizeof(bufs), &grps);
getgrent_r(&sts, bufs, sizeof(bufs), &grps);
getgrent_r(&sts, bufs, sizeof(bufs), &grps);