SLP_LAST_CALL
cb(hp, NULL, SLP_LAST_CALL, cookie);
cb(hp, NULL, SLP_LAST_CALL, cookie);
cb(hp, NULL, SLP_LAST_CALL, cookie);
cb(hp, NULL, SLP_LAST_CALL, cookie);
cb(hp, NULL, 0, SLP_LAST_CALL, cookie);
cb(hp, NULL, 0, SLP_LAST_CALL, cookie);
cb(hp, NULL, 0, SLP_LAST_CALL, cookie);
cb(hSLP, NULL, SLP_LAST_CALL, cookie);
if (err == SLP_LAST_CALL) {