[gnutls-devel] GnuTLS | kTLS gets desynchronised when sending (in gnutls_record_send) (#1470)

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Daniel P_ Berrangé commented on a discussion: https://gitlab.com/gnutls/gnutls/-/issues/1470#note_1308870699

I concur, the lines

```
			case EINTR:
				return GNUTLS_E_INTERRUPTED;
			case EAGAIN:
				return GNUTLS_E_AGAIN;
```

both have broken semantics AFAICT.  Those two error codes must *ONLY* be returned if 'data_size == 0', otherwise the caller has no knowledge of fact that some bytes were successfully sent.

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