Class File

Lib/test/test_socket.py:2096–2101

    @unittest.skipUnless(hasattr(os, 'sendfile'), 'test needs os.sendfile()')
    def test__sendfile_use_sendfile(self):
        class File:
            def __init__(self, fd):
                self.fd = fd

            def fileno(self):
                return self.fd
        with socket.socket() as sock:
            fd = os.open(os.curdir, os.O_RDONLY)
            os.close(fd)