getusername
user = getusername(stb.st_uid, target, opts);
if (strcmp(owner, getusername(statp->st_uid,
getusername(statp->st_uid,
char *getusername(uid_t, char *, opt_t);
if ((cp = getusername(stb.st_uid, target, o))
(cp = getusername(stb.st_uid,
getusername(stb.st_uid, target, options),