gh-65920: Implement socket.sendfile with TransmitFile on Windows
#112337
+169
−36
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Overlapped.TransmitFilein_overlappedmodule to implementsocket.sendfile;Overlapped.getresultexto implement the timeout functionality, which have almost the same codes as existsOverlapped.getresult, just with diffenernt arguments. I split theOverlapped.getresultin to another function to share the codes.And some thought on
os.sendfile: #102898 (comment)