1 files changed, 52 insertions, 0 deletions
diff --git a/third_party/rust/iovec/src/sys/unix.rs b/third_party/rust/iovec/src/sys/unix.rs
new file mode 100644
index 0000000000..4dbc0674f8
--- /dev/null
+++ b/third_party/rust/iovec/src/sys/unix.rs
@@ -0,0 +1,52 @@
+use libc;
+use std::{mem, slice, usize};
+
+pub struct IoVec {
+    inner: [u8],
+}
+
+pub const MAX_LENGTH: usize = usize::MAX;
+
+impl IoVec {
+    pub fn as_ref(&self) -> &[u8] {
+        unsafe {
+            let vec = self.iovec();
+            slice::from_raw_parts(vec.iov_base as *const u8, vec.iov_len)
+        }
+    }
+
+    pub fn as_mut(&mut self) -> &mut [u8] {
+        unsafe {
+            let vec = self.iovec();
+            slice::from_raw_parts_mut(vec.iov_base as *mut u8, vec.iov_len)
+        }
+    }
+
+    unsafe fn iovec(&self) -> libc::iovec {
+        mem::transmute(&self.inner)
+    }
+}
+
+impl<'a> From<&'a [u8]> for &'a IoVec {
+    fn from(src: &'a [u8]) -> Self {
+        assert!(src.len() > 0);
+        unsafe {
+            mem::transmute(libc::iovec {
+                iov_base: src.as_ptr() as *mut _,
+                iov_len: src.len(),
+            })
+        }
+    }
+}
+
+impl<'a> From<&'a mut [u8]> for &'a mut IoVec {
+    fn from(src: &'a mut [u8]) -> Self {
+        assert!(src.len() > 0);
+        unsafe {
+            mem::transmute(libc::iovec {
+                iov_base: src.as_ptr() as *mut _,
+                iov_len: src.len(),
+            })
+        }
+    }
+}