Function pwritev
pub unsafe extern "C" fn pwritev(fd: c_int, iov: *const iovec, iovcnt: c_int, offset: off_t) -> ssize_tpwritevpub unsafe extern "C" fn pwritev(fd: c_int, iov: *const iovec, iovcnt: c_int, offset: off_t) -> ssize_t