[issue31711] ssl.SSLSocket.send(b"") fails

[Nathaniel Smith]

Nathaniel Smith <njs at pobox.com> added the comment:

My point is that SSL_write(3ssl) says "WARNING: When calling SSL_write() with num=0 bytes to be sent the behaviour is undefined."

Apparently on the particular openssl you're looking at, it gives SSL_ERROR_SYSCALL with error code == 0 and len == 0, but the openssl devs claim this is some arbitrary thing that shouldn't be depended on.

Just as a general principle it would be nice if performing ordinary operations on an SSLSocket from Python did not invoke undefined behavior :-)

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<https://bugs.python.org/issue31711>
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