[issue17552] Add a new socket.sendfile() method

[Charles-François Natali]

Charles-François Natali added the comment:

> Looking back at this I think a "send_blocksize" argument is necessary after all. shutil.copyfileobj() has it, so is ftplib.FTP.storbinary() and  httplib (issue 13559) which will both be using socket.sendfile() once it gets included.

Those APIs are really poor, please don't cripple sendfile() to mirror them.

Once again, a send_blocksize argument doesn't make sense, you won't
find it anywhere else. All that's needed is start offset and a
size/length argument.

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<http://bugs.python.org/issue17552>
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