Can single-buffer blocking WSASend deliver partial data?

Posted by CodeAngry on Stack Overflow See other posts from Stack Overflow or by CodeAngry
Published on 2014-04-02T19:30:45Z Indexed on 2014/05/29 3:27 UTC
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c++

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winapi

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winsock

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winsock2

I've pretty much always used send() with sockets and now I'm moving onto the WSA functions. With send(), I have a sendall() helper that ensured all data is delivered even if it didn't happen in one try and a partial send occurred on first call.

So, instead of learning the hard way or over-complicating code when I don't have to, decided to ask you:

Can a blocking WSASend() send partial data or does it send everything before it returns or fails? Or should I check the bytes sent vs. expected to send and keep at it until everything is delivered?

ANSWER: Overlapped WSASend() does not send partial data but if it does, it means the connection has terminated. I've never encountered the case yet.

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