psk_use_session_cb
SSL_CTX_set_psk_use_session_callback(ctx, psk_use_session_cb);
&& sc->psk_use_session_cb == NULL)
&& (sc->psk_use_session_cb == NULL))) {
sc->psk_use_session_cb = cb;
ctx->psk_use_session_cb = cb;
s->psk_use_session_cb = ctx->psk_use_session_cb;
SSL_psk_use_session_cb_func psk_use_session_cb;
SSL_psk_use_session_cb_func psk_use_session_cb;
if (s->psk_use_session_cb != NULL
&& (!s->psk_use_session_cb(ussl, handmd, &id, &idlen, &psksess)