1 files changed, 44 insertions, 0 deletions
diff --git a/third_party/rust/mio-0.6.23/src/sys/unix/uio.rs b/third_party/rust/mio-0.6.23/src/sys/unix/uio.rs
new file mode 100644
index 0000000000..e38cd4983b
--- /dev/null
+++ b/third_party/rust/mio-0.6.23/src/sys/unix/uio.rs
@@ -0,0 +1,44 @@
+use std::cmp;
+use std::io;
+use std::os::unix::io::AsRawFd;
+use libc;
+use iovec::IoVec;
+use iovec::unix as iovec;
+
+pub trait VecIo {
+    fn readv(&self, bufs: &mut [&mut IoVec]) -> io::Result<usize>;
+
+    fn writev(&self, bufs: &[&IoVec]) -> io::Result<usize>;
+}
+
+impl<T: AsRawFd> VecIo for T {
+    fn readv(&self, bufs: &mut [&mut IoVec]) -> io::Result<usize> {
+        unsafe {
+            let slice = iovec::as_os_slice_mut(bufs);
+            let len = cmp::min(<libc::c_int>::max_value() as usize, slice.len());
+            let rc = libc::readv(self.as_raw_fd(),
+                                 slice.as_ptr(),
+                                 len as libc::c_int);
+            if rc < 0 {
+                Err(io::Error::last_os_error())
+            } else {
+                Ok(rc as usize)
+            }
+        }
+    }
+
+    fn writev(&self, bufs: &[&IoVec]) -> io::Result<usize> {
+        unsafe {
+            let slice = iovec::as_os_slice(bufs);
+            let len = cmp::min(<libc::c_int>::max_value() as usize, slice.len());
+            let rc = libc::writev(self.as_raw_fd(),
+                                  slice.as_ptr(),
+                                  len as libc::c_int);
+            if rc < 0 {
+                Err(io::Error::last_os_error())
+            } else {
+                Ok(rc as usize)
+            }
+        }
+    }
+}
+\ No newline at end of file