ALLOW_FAIL
int allow_fail = ((flags & ALLOW_FAIL) != 0);
flags &= ~(uint64_t)ALLOW_FAIL;
OP_C_NEW_STREAM_BIDI_EX(a, ANY_ID, ALLOW_FAIL | SSL_STREAM_FLAG_NO_BLOCK)
OP_C_NEW_STREAM_UNI_EX(a, ANY_ID, ALLOW_FAIL | SSL_STREAM_FLAG_NO_BLOCK)