pub(crate) fn tee(
fd_in: BorrowedFd<'_>,
fd_out: BorrowedFd<'_>,
len: usize,
flags: SpliceFlags,
) -> Result<usize>
pub(crate) fn tee(
fd_in: BorrowedFd<'_>,
fd_out: BorrowedFd<'_>,
len: usize,
flags: SpliceFlags,
) -> Result<usize>