1 files changed, 68 insertions, 0 deletions
diff --git a/third_party/rust/iovec/src/unix.rs b/third_party/rust/iovec/src/unix.rs
new file mode 100644
index 0000000000..3ef3728bb0
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+++ b/third_party/rust/iovec/src/unix.rs
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+//! IoVec extensions for Unix platforms.
+//!
+//! These functions provide conversions to unix specific representations of the
+//! vectored data.
+//!
+//! # Examples
+//!
+//! ```
+//! use iovec::IoVec;
+//! use iovec::unix;
+//!
+//! let a = b"hello".to_vec();
+//! let b = b"world".to_vec();
+//!
+//! let bufs: &[&IoVec] = &[(&a[..]).into(), (&b[..]).into()];
+//! let os_bufs = unix::as_os_slice(&bufs[..]);
+//!
+//! // Use the `os_bufs` slice with `writev`.
+//! ```
+
+use IoVec;
+use libc;
+
+use std::mem;
+
+/// Convert a slice of `IoVec` refs to a slice of `libc::iovec`.
+///
+/// The return value can be passed to `writev` bindings.
+///
+/// # Examples
+///
+/// ```
+/// use iovec::IoVec;
+/// use iovec::unix;
+///
+/// let a = b"hello".to_vec();
+/// let b = b"world".to_vec();
+///
+/// let bufs: &[&IoVec] = &[a[..].into(), b[..].into()];
+/// let os_bufs = unix::as_os_slice(bufs);
+///
+/// // Use the `os_bufs` slice with `writev`.
+/// ```
+pub fn as_os_slice<'a>(iov: &'a [&IoVec]) -> &'a [libc::iovec] {
+    unsafe { mem::transmute(iov) }
+}
+
+/// Convert a mutable slice of `IoVec` refs to a mutable slice of `libc::iovec`.
+///
+/// The return value can be passed to `readv` bindings.
+///
+/// # Examples
+///
+/// ```
+/// use iovec::IoVec;
+/// use iovec::unix;
+///
+/// let mut a = [0; 10];
+/// let mut b = [0; 10];
+///
+/// let bufs: &mut [&mut IoVec] = &mut [(&mut a[..]).into(), (&mut b[..]).into()];
+/// let os_bufs = unix::as_os_slice_mut(bufs);
+///
+/// // Use the `os_bufs` slice with `readv`.
+/// ```
+pub fn as_os_slice_mut<'a>(iov: &'a mut [&mut IoVec]) -> &'a mut [libc::iovec] {
+    unsafe { mem::transmute(iov) }
+}