Function nginx::copy_file_range

pub unsafe extern "C" fn copy_file_range(
    __infd: c_int, 
    __pinoff: *mut __off64_t, 
    __outfd: c_int, 
    __poutoff: *mut __off64_t, 
    __length: size_t, 
    __flags: c_uint
) -> ssize_t