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SubjectRE: OT: why no file copy() libc/syscall ??
(Among the other N objections, add things like the lack of any sort of
control or option parameters)
N += 1: Sparse Copying (e.g. seeking past blocks of zeros)
N += 1: Unlink or overwrite or what?
N += 1: In-Kernel locking and resolution for pages that are mandatory
N += 1: No fine-grained control for concurrency issues (multiple writers)

Start with doing a cp --help and move on from there for an unbounded list of
issues that sys_copy(int fd1, int fd2) does not even come close to

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