Use recv/send instead of read/write
The recv/send calls are more portable than read/write, since unlike the latter, the former work with Windows sockets. We also check for EWOULDBLOCK instead of EAGAIN. On most Unices, EAGAIN and EWOULDBLBOCK are the same thing. However, on Windows they are different, and send/recv are expected to give EWOULDBLOCK for non-blocking sockets.
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