[issue10882] Add os.sendfile()

[Ross Lagerwall]

Ross Lagerwall <rosslagerwall at gmail.com> added the comment:

OK, updated documentation and tests.

> Why special case these? Why can't Mac OS X and FreeBSD write those manually into the output file descriptor.

These can be a crucial part of certain protocols such as HTTP to ensure that a minimal amount of TCP packets are sent. Also, the posix module is supposed to expose the OS functionality transparently. Besides, if you don't want to use headers/trailers, they can simply be left out.

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Added file: http://bugs.python.org/file20597/sendfile_v5.patch

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