SSL_CTX_flush_sessions_ex
void SSL_CTX_flush_sessions_ex(SSL_CTX *ctx, time_t tm);
SSL_CTX_flush_sessions_ex(a, 0);
SSL_CTX_flush_sessions_ex(s->session_ctx, time(NULL));
SSL_CTX_flush_sessions_ex(s, (time_t)t);
SSL_CTX_flush_sessions_ex(ctx, 0);
SSL_CTX_flush_sessions_ex(ctx, now + TIMEOUT - 1);
SSL_CTX_flush_sessions_ex(ctx, now + TIMEOUT + 1);
SSL_CTX_flush_sessions_ex(ctx, now + TIMEOUT + 11);