extern "c" fn copy_file_range(fd_in: fd_t, off_in: ?*i64, fd_out: fd_t, off_out: ?*i64, len: usize, flags: c_uint) isize
fd_in: fd_t
off_in: ?*i64
fd_out: fd_t
off_out: ?*i64
len: usize
flags: c_uint
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