SSL_CTX_set_psk_use_session_callback
SSL_CTX_set_psk_use_session_callback(ctx, psk_use_session_cb);
void SSL_CTX_set_psk_use_session_callback(SSL_CTX *ctx,
SSL_CTX_set_psk_use_session_callback(cctx, use_session_cb);
SSL_CTX_set_psk_use_session_callback(*cctx, use_session_cb);
SSL_CTX_set_psk_use_session_callback(cctx, use_session_cb);