Function vmsplice

pub unsafe fn vmsplice<PipeFd: AsFd>(
    fd: PipeFd,
    bufs: &[IoSliceRaw<'_>],
    flags: SpliceFlags,
) -> Result<usize>

vmsplice(fd, bufs, flags)—Transfer data between memory and a pipe.

If fd is the write end of the pipe, the function maps the memory pointer at by bufs to the pipe.

If fd is the read end of the pipe, the function writes data from the pipe to said memory.

Safety

If the memory must not be mutated (such as when bufs were originally immutable slices), it is up to the caller to ensure that the write end of the pipe is placed in fd.

Additionally if SpliceFlags::GIFT is set, the caller must also ensure that the contents of bufs in never modified following the call, and that all of the pointers in bufs are page aligned, and the lengths are multiples of a page size in bytes.

References

• Linux