getuser
login = getuser(user);
if ((user = getuser(getuid())) == NULL)
login = getuser((uid_t)buf.st_uid);
pp = getuser((uid_t)statptr->st_uid);
pp = getuser((user = getuid()));
extern char *getuser(uid_t);
pp = getuser(ruid);
pp = getuser(ruid);
while (!(ret = getuser(name)) && errno == EINTR)
USER * getuser ( char *);