[issue21430] Document ssl.pending()

[Antoine Pitrou]

Antoine Pitrou added the comment:

> So to make use of select with SSL the application would have to check first
> with pending, if there are already buffered data,

What's the point of checking? Just call SSL_read() and catch the SSL_ERROR_WANT_{READ,WRITE} to determine that no data is available; as a bonus it also tells you whether you have to select() for read or for write.

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<http://bugs.python.org/issue21430>
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