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The winsock2 library provides functions that work on different data types than file descriptors, therefore we wrap them. But that is not the only difference: they also do not set `errno` but expect the callers to enquire about errors via `WSAGetLastError()`. Let's translate that into appropriate `errno` values whenever the socket operations fail so that Git's code base does not have to change its expectations. This closes https://github.com/git-for-windows/git/issues/2404 Helped-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>