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We called sendfile with 16kb (a.k.a. COPY_BUFFER_SIZE) as the maximum number of bytes to copy. This seems rather inefficient, especially with large files. Instead, call sendfile with a "large" maximum. What "large" max means is a bit tricky: current file offset + max must fit in loff_t. This means that as we call sendfile more than once, we have to lower the max size. With this patch, test-copy calls sendfile twice, e.g.: sendfile(4, 3, NULL, 9223372036854775807) = 738760 sendfile(4, 3, NULL, 9223372036854037047) = 0 The second call is necessary to determine EOF.
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