Add Read/Write::can_read/write_vectored

When working with an arbitrary reader or writer, code that uses vectored
operations may end up being slower than code that copies into a single
buffer when the underlying reader or writer doesn't actually support
vectored operations. These new methods allow you to ask the reader or
witer up front if vectored operations are efficiently supported.

Currently, you have to use some heuristics to guess by e.g. checking if
the read or write only accessed the first buffer. Hyper is one concrete
example of a library that has to do this dynamically:
https://github.com/hyperium/hyper/blob/0eaf304644a396895a4ce1f0146e596640bb666a/src/proto/h1/io.rs#L582-L594

43 files changed, 556 insertions, 0 deletions

diff --git a/src/libstd/fs.rs b/src/libstd/fs.rs
index 119bdfcb0f4..cc2d79ee084 100644
--- a/src/libstd/fs.rs
+++ b/src/libstd/fs.rs
@@ -660,6 +660,11 @@ impl Read for File {
     }
 
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        self.inner.can_read_vectored()
+    }
+
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
@@ -674,6 +679,11 @@ impl Write for File {
         self.inner.write_vectored(bufs)
     }
 
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        self.inner.can_write_vectored()
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         self.inner.flush()
     }
@@ -695,6 +705,11 @@ impl Read for &File {
     }
 
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        self.inner.can_read_vectored()
+    }
+
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
@@ -709,6 +724,11 @@ impl Write for &File {
         self.inner.write_vectored(bufs)
     }
 
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        self.inner.can_write_vectored()
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         self.inner.flush()
     }
diff --git a/src/libstd/io/buffered.rs b/src/libstd/io/buffered.rs
index 16ca539b3c1..cabeaf4ae77 100644
--- a/src/libstd/io/buffered.rs
+++ b/src/libstd/io/buffered.rs
@@ -292,6 +292,10 @@ impl<R: Read> Read for BufReader<R> {
         Ok(nread)
     }
 
+    fn can_read_vectored(&self) -> bool {
+        self.inner.can_read_vectored()
+    }
+
     // we can't skip unconditionally because of the large buffer case in read.
     unsafe fn initializer(&self) -> Initializer {
         self.inner.initializer()
@@ -680,6 +684,10 @@ impl<W: Write> Write for BufWriter<W> {
         }
     }
 
+    fn can_write_vectored(&self) -> bool {
+        self.get_ref().can_write_vectored()
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         self.flush_buf().and_then(|()| self.get_mut().flush())
     }
diff --git a/src/libstd/io/cursor.rs b/src/libstd/io/cursor.rs
index f36aa1846a1..859431ea0ef 100644
--- a/src/libstd/io/cursor.rs
+++ b/src/libstd/io/cursor.rs
@@ -266,6 +266,10 @@ where
         Ok(nread)
     }
 
+    fn can_read_vectored(&self) -> bool {
+        true
+    }
+
     fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
         let n = buf.len();
         Read::read_exact(&mut self.fill_buf()?, buf)?;
@@ -373,6 +377,11 @@ impl Write for Cursor<&mut [u8]> {
     }
 
     #[inline]
+    fn can_write_vectored(&self) -> bool {
+        true
+    }
+
+    #[inline]
     fn flush(&mut self) -> io::Result<()> {
         Ok(())
     }
@@ -389,6 +398,11 @@ impl Write for Cursor<&mut Vec<u8>> {
     }
 
     #[inline]
+    fn can_write_vectored(&self) -> bool {
+        true
+    }
+
+    #[inline]
     fn flush(&mut self) -> io::Result<()> {
         Ok(())
     }
@@ -405,6 +419,11 @@ impl Write for Cursor<Vec<u8>> {
     }
 
     #[inline]
+    fn can_write_vectored(&self) -> bool {
+        true
+    }
+
+    #[inline]
     fn flush(&mut self) -> io::Result<()> {
         Ok(())
     }
@@ -423,6 +442,11 @@ impl Write for Cursor<Box<[u8]>> {
     }
 
     #[inline]
+    fn can_write_vectored(&self) -> bool {
+        true
+    }
+
+    #[inline]
     fn flush(&mut self) -> io::Result<()> {
         Ok(())
     }
diff --git a/src/libstd/io/impls.rs b/src/libstd/io/impls.rs
index b7f82e65299..1fb9f12dd90 100644
--- a/src/libstd/io/impls.rs
+++ b/src/libstd/io/impls.rs
@@ -21,6 +21,11 @@ impl<R: Read + ?Sized> Read for &mut R {
     }
 
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        (**self).can_read_vectored()
+    }
+
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         (**self).initializer()
     }
@@ -53,6 +58,11 @@ impl<W: Write + ?Sized> Write for &mut W {
     }
 
     #[inline]
+    fn can_write_vectored(&self) -> bool {
+        (**self).can_write_vectored()
+    }
+
+    #[inline]
     fn flush(&mut self) -> io::Result<()> {
         (**self).flush()
     }
@@ -110,6 +120,11 @@ impl<R: Read + ?Sized> Read for Box<R> {
     }
 
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        (**self).can_read_vectored()
+    }
+
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         (**self).initializer()
     }
@@ -142,6 +157,11 @@ impl<W: Write + ?Sized> Write for Box<W> {
     }
 
     #[inline]
+    fn can_write_vectored(&self) -> bool {
+        (**self).can_write_vectored()
+    }
+
+    #[inline]
     fn flush(&mut self) -> io::Result<()> {
         (**self).flush()
     }
@@ -241,6 +261,11 @@ impl Read for &[u8] {
     }
 
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        true
+    }
+
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
@@ -317,6 +342,11 @@ impl Write for &mut [u8] {
     }
 
     #[inline]
+    fn can_write_vectored(&self) -> bool {
+        true
+    }
+
+    #[inline]
     fn write_all(&mut self, data: &[u8]) -> io::Result<()> {
         if self.write(data)? == data.len() {
             Ok(())
@@ -352,6 +382,11 @@ impl Write for Vec<u8> {
     }
 
     #[inline]
+    fn can_write_vectored(&self) -> bool {
+        true
+    }
+
+    #[inline]
     fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
         self.extend_from_slice(buf);
         Ok(())
diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index 5ab88260d6a..c6229fb39e0 100644
--- a/src/libstd/io/mod.rs
+++ b/src/libstd/io/mod.rs
@@ -580,6 +580,19 @@ pub trait Read {
         default_read_vectored(|b| self.read(b), bufs)
     }
 
+    /// Determines if this `Read`er has an efficient `read_vectored`
+    /// implementation.
+    ///
+    /// If a `Read`er does not override the default `read_vectored`
+    /// implementation, code using it may want to avoid the method all together
+    /// and coalesce writes into a single buffer for higher performance.
+    ///
+    /// The default implementation returns `false`.
+    #[unstable(feature = "can_vector", issue = "none")]
+    fn can_read_vectored(&self) -> bool {
+        false
+    }
+
     /// Determines if this `Read`er can work with buffers of uninitialized
     /// memory.
     ///
@@ -1304,6 +1317,19 @@ pub trait Write {
         default_write_vectored(|b| self.write(b), bufs)
     }
 
+    /// Determines if this `Write`er has an efficient `write_vectored`
+    /// implementation.
+    ///
+    /// If a `Write`er does not override the default `write_vectored`
+    /// implementation, code using it may want to avoid the method all together
+    /// and coalesce writes into a single buffer for higher performance.
+    ///
+    /// The default implementation returns `false`.
+    #[unstable(feature = "can_vector", issue = "none")]
+    fn can_write_vectored(&self) -> bool {
+        false
+    }
+
     /// Flush this output stream, ensuring that all intermediately buffered
     /// contents reach their destination.
     ///
diff --git a/src/libstd/io/stdio.rs b/src/libstd/io/stdio.rs
index a064c552c84..fd5a1291785 100644
--- a/src/libstd/io/stdio.rs
+++ b/src/libstd/io/stdio.rs
@@ -88,6 +88,11 @@ impl Read for StdinRaw {
     }
 
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        self.0.can_read_vectored()
+    }
+
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
@@ -101,6 +106,11 @@ impl Write for StdoutRaw {
         self.0.write_vectored(bufs)
     }
 
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        self.0.can_write_vectored()
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         self.0.flush()
     }
@@ -114,6 +124,11 @@ impl Write for StderrRaw {
         self.0.write_vectored(bufs)
     }
 
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        self.0.can_write_vectored()
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         self.0.flush()
     }
@@ -140,6 +155,14 @@ impl<W: io::Write> io::Write for Maybe<W> {
         }
     }
 
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        match self {
+            Maybe::Real(w) => w.can_write_vectored(),
+            Maybe::Fake => true,
+        }
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         match *self {
             Maybe::Real(ref mut w) => handle_ebadf(w.flush(), ()),
@@ -162,6 +185,14 @@ impl<R: io::Read> io::Read for Maybe<R> {
             Maybe::Fake => Ok(0),
         }
     }
+
+    #[inline]
+    fn can_read_vectored(&self) -> bool {
+        match self {
+            Maybe::Real(w) => w.can_read_vectored(),
+            Maybe::Fake => true,
+        }
+    }
 }
 
 fn handle_ebadf<T>(r: io::Result<T>, default: T) -> io::Result<T> {
@@ -352,6 +383,10 @@ impl Read for Stdin {
         self.lock().read_vectored(bufs)
     }
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        self.lock().can_read_vectored()
+    }
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
@@ -377,6 +412,11 @@ impl Read for StdinLock<'_> {
     }
 
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        self.inner.can_read_vectored()
+    }
+
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
@@ -543,6 +583,10 @@ impl Write for Stdout {
     fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
         self.lock().write_vectored(bufs)
     }
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        self.lock().can_write_vectored()
+    }
     fn flush(&mut self) -> io::Result<()> {
         self.lock().flush()
     }
@@ -561,6 +605,10 @@ impl Write for StdoutLock<'_> {
     fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
         self.inner.borrow_mut().write_vectored(bufs)
     }
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        self.inner.borrow_mut().can_write_vectored()
+    }
     fn flush(&mut self) -> io::Result<()> {
         self.inner.borrow_mut().flush()
     }
@@ -709,6 +757,10 @@ impl Write for Stderr {
     fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
         self.lock().write_vectored(bufs)
     }
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        self.lock().can_write_vectored()
+    }
     fn flush(&mut self) -> io::Result<()> {
         self.lock().flush()
     }
@@ -727,6 +779,10 @@ impl Write for StderrLock<'_> {
     fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
         self.inner.borrow_mut().write_vectored(bufs)
     }
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        self.inner.borrow_mut().can_write_vectored()
+    }
     fn flush(&mut self) -> io::Result<()> {
         self.inner.borrow_mut().flush()
     }
diff --git a/src/libstd/io/util.rs b/src/libstd/io/util.rs
index b09161b97aa..01947cd8b89 100644
--- a/src/libstd/io/util.rs
+++ b/src/libstd/io/util.rs
@@ -180,6 +180,11 @@ impl Read for Repeat {
     }
 
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        true
+    }
+
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
@@ -236,6 +241,11 @@ impl Write for Sink {
     }
 
     #[inline]
+    fn can_write_vectored(&self) -> bool {
+        true
+    }
+
+    #[inline]
     fn flush(&mut self) -> io::Result<()> {
         Ok(())
     }
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 5fd15bb8fe4..ac07af5e278 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -243,6 +243,7 @@
 #![feature(box_syntax)]
 #![feature(c_variadic)]
 #![feature(cfg_accessible)]
+#![feature(can_vector)]
 #![feature(cfg_target_has_atomic)]
 #![feature(cfg_target_thread_local)]
 #![feature(char_error_internals)]
diff --git a/src/libstd/net/tcp.rs b/src/libstd/net/tcp.rs
index 5023d692408..86955a79759 100644
--- a/src/libstd/net/tcp.rs
+++ b/src/libstd/net/tcp.rs
@@ -577,6 +577,11 @@ impl Read for TcpStream {
     }
 
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        self.0.can_read_vectored()
+    }
+
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
@@ -591,6 +596,11 @@ impl Write for TcpStream {
         self.0.write_vectored(bufs)
     }
 
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        self.0.can_write_vectored()
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         Ok(())
     }
@@ -606,6 +616,11 @@ impl Read for &TcpStream {
     }
 
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        self.0.can_read_vectored()
+    }
+
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
@@ -620,6 +635,11 @@ impl Write for &TcpStream {
         self.0.write_vectored(bufs)
     }
 
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        self.0.can_write_vectored()
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         Ok(())
     }
diff --git a/src/libstd/process.rs b/src/libstd/process.rs
index 3eee45d000c..2d22eb4ceaf 100644
--- a/src/libstd/process.rs
+++ b/src/libstd/process.rs
@@ -245,6 +245,10 @@ impl Write for ChildStdin {
         self.inner.write_vectored(bufs)
     }
 
+    fn can_write_vectored(&self) -> bool {
+        self.inner.can_write_vectored()
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         Ok(())
     }
@@ -301,6 +305,11 @@ impl Read for ChildStdout {
     }
 
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        self.inner.can_read_vectored()
+    }
+
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
@@ -357,6 +366,11 @@ impl Read for ChildStderr {
     }
 
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        self.inner.can_read_vectored()
+    }
+
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
diff --git a/src/libstd/sys/cloudabi/shims/fs.rs b/src/libstd/sys/cloudabi/shims/fs.rs
index e6160d1457d..e34483447e9 100644
--- a/src/libstd/sys/cloudabi/shims/fs.rs
+++ b/src/libstd/sys/cloudabi/shims/fs.rs
@@ -202,6 +202,10 @@ impl File {
         match self.0 {}
     }
 
+    pub fn can_read_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn write(&self, _buf: &[u8]) -> io::Result<usize> {
         match self.0 {}
     }
@@ -210,6 +214,10 @@ impl File {
         match self.0 {}
     }
 
+    pub fn can_write_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn flush(&self) -> io::Result<()> {
         match self.0 {}
     }
diff --git a/src/libstd/sys/cloudabi/shims/net.rs b/src/libstd/sys/cloudabi/shims/net.rs
index 67c436fa795..22195661a2e 100644
--- a/src/libstd/sys/cloudabi/shims/net.rs
+++ b/src/libstd/sys/cloudabi/shims/net.rs
@@ -47,6 +47,10 @@ impl TcpStream {
         match self.0 {}
     }
 
+    pub fn can_read_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn write(&self, _: &[u8]) -> io::Result<usize> {
         match self.0 {}
     }
@@ -55,6 +59,10 @@ impl TcpStream {
         match self.0 {}
     }
 
+    pub fn can_write_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn peer_addr(&self) -> io::Result<SocketAddr> {
         match self.0 {}
     }
diff --git a/src/libstd/sys/cloudabi/shims/pipe.rs b/src/libstd/sys/cloudabi/shims/pipe.rs
index fb14dc59101..eed8d1fdd56 100644
--- a/src/libstd/sys/cloudabi/shims/pipe.rs
+++ b/src/libstd/sys/cloudabi/shims/pipe.rs
@@ -12,6 +12,10 @@ impl AnonPipe {
         match self.0 {}
     }
 
+    pub fn can_read_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn write(&self, _buf: &[u8]) -> io::Result<usize> {
         match self.0 {}
     }
@@ -20,6 +24,10 @@ impl AnonPipe {
         match self.0 {}
     }
 
+    pub fn can_write_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn diverge(&self) -> ! {
         match self.0 {}
     }
diff --git a/src/libstd/sys/hermit/fs.rs b/src/libstd/sys/hermit/fs.rs
index 287a0390667..8d9a359f94b 100644
--- a/src/libstd/sys/hermit/fs.rs
+++ b/src/libstd/sys/hermit/fs.rs
@@ -301,6 +301,11 @@ impl File {
         crate::io::default_read_vectored(|buf| self.read(buf), bufs)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        false
+    }
+
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         self.0.write(buf)
     }
@@ -309,6 +314,11 @@ impl File {
         crate::io::default_write_vectored(|buf| self.write(buf), bufs)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        false
+    }
+
     pub fn flush(&self) -> io::Result<()> {
         Ok(())
     }
diff --git a/src/libstd/sys/hermit/net.rs b/src/libstd/sys/hermit/net.rs
index 377c3132c5a..a8a82dba62e 100644
--- a/src/libstd/sys/hermit/net.rs
+++ b/src/libstd/sys/hermit/net.rs
@@ -99,6 +99,11 @@ impl TcpStream {
         Ok(size)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        true
+    }
+
     pub fn write(&self, buffer: &[u8]) -> io::Result<usize> {
         self.write_vectored(&[IoSlice::new(buffer)])
     }
@@ -114,6 +119,11 @@ impl TcpStream {
         Ok(size)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        true
+    }
+
     pub fn peer_addr(&self) -> io::Result<SocketAddr> {
         Err(io::Error::new(ErrorKind::Other, "peer_addr isn't supported"))
     }
diff --git a/src/libstd/sys/hermit/pipe.rs b/src/libstd/sys/hermit/pipe.rs
index fb14dc59101..eed8d1fdd56 100644
--- a/src/libstd/sys/hermit/pipe.rs
+++ b/src/libstd/sys/hermit/pipe.rs
@@ -12,6 +12,10 @@ impl AnonPipe {
         match self.0 {}
     }
 
+    pub fn can_read_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn write(&self, _buf: &[u8]) -> io::Result<usize> {
         match self.0 {}
     }
@@ -20,6 +24,10 @@ impl AnonPipe {
         match self.0 {}
     }
 
+    pub fn can_write_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn diverge(&self) -> ! {
         match self.0 {}
     }
diff --git a/src/libstd/sys/hermit/stdio.rs b/src/libstd/sys/hermit/stdio.rs
index 2eb011ccb39..ba72775e145 100644
--- a/src/libstd/sys/hermit/stdio.rs
+++ b/src/libstd/sys/hermit/stdio.rs
@@ -20,6 +20,11 @@ impl Stdin {
         //    .read(data)
         Ok(0)
     }
+
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        true
+    }
 }
 
 impl Stdout {
@@ -51,6 +56,11 @@ impl Stdout {
         }
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        true
+    }
+
     pub fn flush(&self) -> io::Result<()> {
         Ok(())
     }
@@ -85,6 +95,11 @@ impl Stderr {
         }
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        true
+    }
+
     pub fn flush(&self) -> io::Result<()> {
         Ok(())
     }
diff --git a/src/libstd/sys/sgx/fd.rs b/src/libstd/sys/sgx/fd.rs
index 7da2424a642..6cc7adde4d1 100644
--- a/src/libstd/sys/sgx/fd.rs
+++ b/src/libstd/sys/sgx/fd.rs
@@ -34,6 +34,11 @@ impl FileDesc {
         usercalls::read(self.fd, bufs)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        true
+    }
+
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         usercalls::write(self.fd, &[IoSlice::new(buf)])
     }
@@ -42,6 +47,11 @@ impl FileDesc {
         usercalls::write(self.fd, bufs)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        true
+    }
+
     pub fn flush(&self) -> io::Result<()> {
         usercalls::flush(self.fd)
     }
diff --git a/src/libstd/sys/sgx/fs.rs b/src/libstd/sys/sgx/fs.rs
index e6160d1457d..e34483447e9 100644
--- a/src/libstd/sys/sgx/fs.rs
+++ b/src/libstd/sys/sgx/fs.rs
@@ -202,6 +202,10 @@ impl File {
         match self.0 {}
     }
 
+    pub fn can_read_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn write(&self, _buf: &[u8]) -> io::Result<usize> {
         match self.0 {}
     }
@@ -210,6 +214,10 @@ impl File {
         match self.0 {}
     }
 
+    pub fn can_write_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn flush(&self) -> io::Result<()> {
         match self.0 {}
     }
diff --git a/src/libstd/sys/sgx/net.rs b/src/libstd/sys/sgx/net.rs
index bd0652ab464..12a9a1289df 100644
--- a/src/libstd/sys/sgx/net.rs
+++ b/src/libstd/sys/sgx/net.rs
@@ -149,6 +149,11 @@ impl TcpStream {
         self.inner.inner.read_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        self.inner.inner.can_read_vectored()
+    }
+
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         self.inner.inner.write(buf)
     }
@@ -157,6 +162,11 @@ impl TcpStream {
         self.inner.inner.write_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        self.inner.inner.can_write_vectored()
+    }
+
     pub fn peer_addr(&self) -> io::Result<SocketAddr> {
         addr_to_sockaddr(&self.peer_addr)
     }
diff --git a/src/libstd/sys/sgx/pipe.rs b/src/libstd/sys/sgx/pipe.rs
index fb14dc59101..eed8d1fdd56 100644
--- a/src/libstd/sys/sgx/pipe.rs
+++ b/src/libstd/sys/sgx/pipe.rs
@@ -12,6 +12,10 @@ impl AnonPipe {
         match self.0 {}
     }
 
+    pub fn can_read_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn write(&self, _buf: &[u8]) -> io::Result<usize> {
         match self.0 {}
     }
@@ -20,6 +24,10 @@ impl AnonPipe {
         match self.0 {}
     }
 
+    pub fn can_write_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn diverge(&self) -> ! {
         match self.0 {}
     }
diff --git a/src/libstd/sys/unix/ext/net.rs b/src/libstd/sys/unix/ext/net.rs
index 4c3cb67c9ee..60ec73d9de2 100644
--- a/src/libstd/sys/unix/ext/net.rs
+++ b/src/libstd/sys/unix/ext/net.rs
@@ -614,6 +614,11 @@ impl io::Read for UnixStream {
     }
 
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        io::Read::can_read_vectored(&&*self)
+    }
+
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
@@ -630,6 +635,11 @@ impl<'a> io::Read for &'a UnixStream {
     }
 
     #[inline]
+    fn can_read_vectored(&self) -> bool {
+        self.0.can_read_vectored()
+    }
+
+    #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
@@ -645,6 +655,11 @@ impl io::Write for UnixStream {
         io::Write::write_vectored(&mut &*self, bufs)
     }
 
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        io::Write::can_write_vectored(&&*self)
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         io::Write::flush(&mut &*self)
     }
@@ -660,6 +675,11 @@ impl<'a> io::Write for &'a UnixStream {
         self.0.write_vectored(bufs)
     }
 
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        self.0.can_write_vectored()
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         Ok(())
     }
diff --git a/src/libstd/sys/unix/fd.rs b/src/libstd/sys/unix/fd.rs
index 1bba56e334a..7083785f426 100644
--- a/src/libstd/sys/unix/fd.rs
+++ b/src/libstd/sys/unix/fd.rs
@@ -64,6 +64,11 @@ impl FileDesc {
         Ok(ret as usize)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        true
+    }
+
     pub fn read_to_end(&self, buf: &mut Vec<u8>) -> io::Result<usize> {
         let mut me = self;
         (&mut me).read_to_end(buf)
@@ -116,6 +121,11 @@ impl FileDesc {
         Ok(ret as usize)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        true
+    }
+
     pub fn write_at(&self, buf: &[u8], offset: u64) -> io::Result<usize> {
         #[cfg(target_os = "android")]
         use super::android::cvt_pwrite64;
diff --git a/src/libstd/sys/unix/fs.rs b/src/libstd/sys/unix/fs.rs
index a233aa47dff..1e8bbd4325b 100644
--- a/src/libstd/sys/unix/fs.rs
+++ b/src/libstd/sys/unix/fs.rs
@@ -828,6 +828,11 @@ impl File {
         self.0.read_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        self.0.can_read_vectored()
+    }
+
     pub fn read_at(&self, buf: &mut [u8], offset: u64) -> io::Result<usize> {
         self.0.read_at(buf, offset)
     }
@@ -840,6 +845,11 @@ impl File {
         self.0.write_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        self.0.can_write_vectored()
+    }
+
     pub fn write_at(&self, buf: &[u8], offset: u64) -> io::Result<usize> {
         self.0.write_at(buf, offset)
     }
diff --git a/src/libstd/sys/unix/l4re.rs b/src/libstd/sys/unix/l4re.rs
index c6e4f5693ed..8510e56af37 100644
--- a/src/libstd/sys/unix/l4re.rs
+++ b/src/libstd/sys/unix/l4re.rs
@@ -55,6 +55,10 @@ pub mod net {
             unimpl!();
         }
 
+        pub fn can_read_vectored(&self) -> bool {
+            unimpl!();
+        }
+
         pub fn peek(&self, _: &mut [u8]) -> io::Result<usize> {
             unimpl!();
         }
@@ -75,6 +79,10 @@ pub mod net {
             unimpl!();
         }
 
+        pub fn can_write_vectored(&self) -> bool {
+            unimpl!();
+        }
+
         pub fn set_timeout(&self, _: Option<Duration>, _: libc::c_int) -> io::Result<()> {
             unimpl!();
         }
@@ -171,6 +179,10 @@ pub mod net {
             unimpl!();
         }
 
+        pub fn can_read_vectored(&self) -> bool {
+            unimpl!();
+        }
+
         pub fn write(&self, _: &[u8]) -> io::Result<usize> {
             unimpl!();
         }
@@ -179,6 +191,10 @@ pub mod net {
             unimpl!();
         }
 
+        pub fn can_write_vectored(&self) -> bool {
+            unimpl!();
+        }
+
         pub fn peer_addr(&self) -> io::Result<SocketAddr> {
             unimpl!();
         }
diff --git a/src/libstd/sys/unix/net.rs b/src/libstd/sys/unix/net.rs
index d18c22b0573..ed97ddf333f 100644
--- a/src/libstd/sys/unix/net.rs
+++ b/src/libstd/sys/unix/net.rs
@@ -226,6 +226,11 @@ impl Socket {
         self.0.read_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        self.0.can_read_vectored()
+    }
+
     fn recv_from_with_flags(
         &self,
         buf: &mut [u8],
@@ -263,6 +268,11 @@ impl Socket {
         self.0.write_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        self.0.can_write_vectored()
+    }
+
     pub fn set_timeout(&self, dur: Option<Duration>, kind: libc::c_int) -> io::Result<()> {
         let timeout = match dur {
             Some(dur) => {
diff --git a/src/libstd/sys/unix/pipe.rs b/src/libstd/sys/unix/pipe.rs
index 2a861c87801..d8ac36df9ec 100644
--- a/src/libstd/sys/unix/pipe.rs
+++ b/src/libstd/sys/unix/pipe.rs
@@ -64,6 +64,11 @@ impl AnonPipe {
         self.0.read_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        self.0.can_read_vectored()
+    }
+
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         self.0.write(buf)
     }
@@ -72,6 +77,11 @@ impl AnonPipe {
         self.0.write_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        self.0.can_write_vectored()
+    }
+
     pub fn fd(&self) -> &FileDesc {
         &self.0
     }
diff --git a/src/libstd/sys/unix/stdio.rs b/src/libstd/sys/unix/stdio.rs
index b9c56963885..4026dd4e497 100644
--- a/src/libstd/sys/unix/stdio.rs
+++ b/src/libstd/sys/unix/stdio.rs
@@ -20,6 +20,11 @@ impl io::Read for Stdin {
     fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
         ManuallyDrop::new(FileDesc::new(libc::STDIN_FILENO)).read_vectored(bufs)
     }
+
+    #[inline]
+    fn can_read_vectored(&self) -> bool {
+        true
+    }
 }
 
 impl Stdout {
@@ -37,6 +42,11 @@ impl io::Write for Stdout {
         ManuallyDrop::new(FileDesc::new(libc::STDOUT_FILENO)).write_vectored(bufs)
     }
 
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        true
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         Ok(())
     }
@@ -57,6 +67,11 @@ impl io::Write for Stderr {
         ManuallyDrop::new(FileDesc::new(libc::STDERR_FILENO)).write_vectored(bufs)
     }
 
+    #[inline]
+    fn can_write_vectored(&self) -> bool {
+        true
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         Ok(())
     }
diff --git a/src/libstd/sys/vxworks/fd.rs b/src/libstd/sys/vxworks/fd.rs
index 65c67dabc1a..0593db65047 100644
--- a/src/libstd/sys/vxworks/fd.rs
+++ b/src/libstd/sys/vxworks/fd.rs
@@ -54,6 +54,11 @@ impl FileDesc {
         Ok(ret as usize)
     }
 
+    #[inline]
+    fn can_read_vectored(&self) -> bool {
+        true
+    }
+
     pub fn read_to_end(&self, buf: &mut Vec<u8>) -> io::Result<usize> {
         let mut me = self;
         (&mut me).read_to_end(buf)
@@ -99,6 +104,11 @@ impl FileDesc {
         Ok(ret as usize)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        true
+    }
+
     pub fn write_at(&self, buf: &[u8], offset: u64) -> io::Result<usize> {
         unsafe fn cvt_pwrite(
             fd: c_int,
diff --git a/src/libstd/sys/vxworks/fs.rs b/src/libstd/sys/vxworks/fs.rs
index 68f2c133170..449431f23d9 100644
--- a/src/libstd/sys/vxworks/fs.rs
+++ b/src/libstd/sys/vxworks/fs.rs
@@ -351,6 +351,11 @@ impl File {
         self.0.read_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        self.0.can_read_vectored()
+    }
+
     pub fn read_at(&self, buf: &mut [u8], offset: u64) -> io::Result<usize> {
         self.0.read_at(buf, offset)
     }
@@ -363,6 +368,11 @@ impl File {
         self.0.write_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        self.0.can_write_vectored()
+    }
+
     pub fn write_at(&self, buf: &[u8], offset: u64) -> io::Result<usize> {
         self.0.write_at(buf, offset)
     }
diff --git a/src/libstd/sys/vxworks/net.rs b/src/libstd/sys/vxworks/net.rs
index 7d4e5624f7e..455bbf3683f 100644
--- a/src/libstd/sys/vxworks/net.rs
+++ b/src/libstd/sys/vxworks/net.rs
@@ -163,6 +163,11 @@ impl Socket {
         self.0.read_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        self.0.can_read_vectored()
+    }
+
     fn recv_from_with_flags(
         &self,
         buf: &mut [u8],
@@ -200,6 +205,11 @@ impl Socket {
         self.0.write_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        self.0.can_write_vectored()
+    }
+
     pub fn set_timeout(&self, dur: Option<Duration>, kind: libc::c_int) -> io::Result<()> {
         let timeout = match dur {
             Some(dur) => {
diff --git a/src/libstd/sys/vxworks/pipe.rs b/src/libstd/sys/vxworks/pipe.rs
index 0990cb8e83c..eb99eba9888 100644
--- a/src/libstd/sys/vxworks/pipe.rs
+++ b/src/libstd/sys/vxworks/pipe.rs
@@ -24,10 +24,16 @@ impl AnonPipe {
     pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
         self.0.read(buf)
     }
+
     pub fn read_vectored(&self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
         self.0.read_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        self.0.can_read_vectored()
+    }
+
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         self.0.write(buf)
     }
@@ -36,6 +42,11 @@ impl AnonPipe {
         self.0.write_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        self.0.can_write_vectored()
+    }
+
     pub fn fd(&self) -> &FileDesc {
         &self.0
     }
diff --git a/src/libstd/sys/wasi/fs.rs b/src/libstd/sys/wasi/fs.rs
index a11f61fdd69..eaf8d3e0ae8 100644
--- a/src/libstd/sys/wasi/fs.rs
+++ b/src/libstd/sys/wasi/fs.rs
@@ -399,6 +399,11 @@ impl File {
         self.fd.read(bufs)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        true
+    }
+
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         self.write_vectored(&[IoSlice::new(buf)])
     }
@@ -407,6 +412,11 @@ impl File {
         self.fd.write(bufs)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        true
+    }
+
     pub fn flush(&self) -> io::Result<()> {
         Ok(())
     }
diff --git a/src/libstd/sys/wasi/net.rs b/src/libstd/sys/wasi/net.rs
index 8a69028ff1d..ac4f55f5f86 100644
--- a/src/libstd/sys/wasi/net.rs
+++ b/src/libstd/sys/wasi/net.rs
@@ -48,6 +48,10 @@ impl TcpStream {
         unsupported()
     }
 
+    pub fn can_read_vectored(&self) -> bool {
+        unsupported()
+    }
+
     pub fn write(&self, _: &[u8]) -> io::Result<usize> {
         unsupported()
     }
@@ -56,6 +60,10 @@ impl TcpStream {
         unsupported()
     }
 
+    pub fn can_write_vectored(&self) -> bool {
+        unsupported()
+    }
+
     pub fn peer_addr(&self) -> io::Result<SocketAddr> {
         unsupported()
     }
diff --git a/src/libstd/sys/wasi/pipe.rs b/src/libstd/sys/wasi/pipe.rs
index fb14dc59101..eed8d1fdd56 100644
--- a/src/libstd/sys/wasi/pipe.rs
+++ b/src/libstd/sys/wasi/pipe.rs
@@ -12,6 +12,10 @@ impl AnonPipe {
         match self.0 {}
     }
 
+    pub fn can_read_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn write(&self, _buf: &[u8]) -> io::Result<usize> {
         match self.0 {}
     }
@@ -20,6 +24,10 @@ impl AnonPipe {
         match self.0 {}
     }
 
+    pub fn can_write_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn diverge(&self) -> ! {
         match self.0 {}
     }
diff --git a/src/libstd/sys/wasi/stdio.rs b/src/libstd/sys/wasi/stdio.rs
index 1d53884f2d6..01b041141a7 100644
--- a/src/libstd/sys/wasi/stdio.rs
+++ b/src/libstd/sys/wasi/stdio.rs
@@ -19,6 +19,11 @@ impl Stdin {
         ManuallyDrop::new(unsafe { WasiFd::from_raw(self.as_raw_fd()) }).read(data)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        true
+    }
+
     pub fn as_raw_fd(&self) -> u32 {
         0
     }
@@ -37,6 +42,11 @@ impl Stdout {
         ManuallyDrop::new(unsafe { WasiFd::from_raw(self.as_raw_fd()) }).write(data)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        true
+    }
+
     pub fn flush(&self) -> io::Result<()> {
         Ok(())
     }
@@ -59,6 +69,11 @@ impl Stderr {
         ManuallyDrop::new(unsafe { WasiFd::from_raw(self.as_raw_fd()) }).write(data)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        true
+    }
+
     pub fn flush(&self) -> io::Result<()> {
         Ok(())
     }
diff --git a/src/libstd/sys/wasm/fs.rs b/src/libstd/sys/wasm/fs.rs
index e6160d1457d..e34483447e9 100644
--- a/src/libstd/sys/wasm/fs.rs
+++ b/src/libstd/sys/wasm/fs.rs
@@ -202,6 +202,10 @@ impl File {
         match self.0 {}
     }
 
+    pub fn can_read_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn write(&self, _buf: &[u8]) -> io::Result<usize> {
         match self.0 {}
     }
@@ -210,6 +214,10 @@ impl File {
         match self.0 {}
     }
 
+    pub fn can_write_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn flush(&self) -> io::Result<()> {
         match self.0 {}
     }
diff --git a/src/libstd/sys/wasm/net.rs b/src/libstd/sys/wasm/net.rs
index b7c3108f172..b9c54f4612e 100644
--- a/src/libstd/sys/wasm/net.rs
+++ b/src/libstd/sys/wasm/net.rs
@@ -44,6 +44,10 @@ impl TcpStream {
         match self.0 {}
     }
 
+    pub fn can_read_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn write(&self, _: &[u8]) -> io::Result<usize> {
         match self.0 {}
     }
@@ -52,6 +56,10 @@ impl TcpStream {
         match self.0 {}
     }
 
+    pub fn can_write_vectored(&self) -> bool {
+        match self.0 {}
+    }
+
     pub fn peer_addr(&self) -> io::Result<SocketAddr> {
         match self.0 {}
     }
diff --git a/src/libstd/sys/windows/fs.rs b/src/libstd/sys/windows/fs.rs
index 427f4b684e1..70134439290 100644
--- a/src/libstd/sys/windows/fs.rs
+++ b/src/libstd/sys/windows/fs.rs
@@ -409,6 +409,11 @@ impl File {
         self.handle.read_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        self.handle.can_read_vectored()
+    }
+
     pub fn read_at(&self, buf: &mut [u8], offset: u64) -> io::Result<usize> {
         self.handle.read_at(buf, offset)
     }
@@ -421,6 +426,11 @@ impl File {
         self.handle.write_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        self.handle.can_write_vectored()
+    }
+
     pub fn write_at(&self, buf: &[u8], offset: u64) -> io::Result<usize> {
         self.handle.write_at(buf, offset)
     }
diff --git a/src/libstd/sys/windows/handle.rs b/src/libstd/sys/windows/handle.rs
index d00381792e3..15a8af71d7f 100644
--- a/src/libstd/sys/windows/handle.rs
+++ b/src/libstd/sys/windows/handle.rs
@@ -92,6 +92,11 @@ impl RawHandle {
         crate::io::default_read_vectored(|buf| self.read(buf), bufs)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        false
+    }
+
     pub fn read_at(&self, buf: &mut [u8], offset: u64) -> io::Result<usize> {
         let mut read = 0;
         let len = cmp::min(buf.len(), <c::DWORD>::max_value() as usize) as c::DWORD;
@@ -171,6 +176,11 @@ impl RawHandle {
         crate::io::default_write_vectored(|buf| self.write(buf), bufs)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        false
+    }
+
     pub fn write_at(&self, buf: &[u8], offset: u64) -> io::Result<usize> {
         let mut written = 0;
         let len = cmp::min(buf.len(), <c::DWORD>::max_value() as usize) as c::DWORD;
diff --git a/src/libstd/sys/windows/net.rs b/src/libstd/sys/windows/net.rs
index d8d4fdfce2f..1b4411e38aa 100644
--- a/src/libstd/sys/windows/net.rs
+++ b/src/libstd/sys/windows/net.rs
@@ -266,6 +266,11 @@ impl Socket {
         }
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        true
+    }
+
     pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
         self.recv_with_flags(buf, c::MSG_PEEK)
     }
@@ -324,6 +329,11 @@ impl Socket {
         Ok(nwritten as usize)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        true
+    }
+
     pub fn set_timeout(&self, dur: Option<Duration>, kind: c_int) -> io::Result<()> {
         let timeout = match dur {
             Some(dur) => {
diff --git a/src/libstd/sys/windows/pipe.rs b/src/libstd/sys/windows/pipe.rs
index 992e634dea5..f6358cf9efd 100644
--- a/src/libstd/sys/windows/pipe.rs
+++ b/src/libstd/sys/windows/pipe.rs
@@ -182,6 +182,11 @@ impl AnonPipe {
         self.inner.read_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        self.inner.can_read_vectored()
+    }
+
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         self.inner.write(buf)
     }
@@ -189,6 +194,11 @@ impl AnonPipe {
     pub fn write_vectored(&self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
         self.inner.write_vectored(bufs)
     }
+
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        self.inner.can_write_vectored()
+    }
 }
 
 pub fn read2(p1: AnonPipe, v1: &mut Vec<u8>, p2: AnonPipe, v2: &mut Vec<u8>) -> io::Result<()> {
diff --git a/src/libstd/sys_common/net.rs b/src/libstd/sys_common/net.rs
index cdd3d2edf1f..bfa93cb4e2c 100644
--- a/src/libstd/sys_common/net.rs
+++ b/src/libstd/sys_common/net.rs
@@ -265,6 +265,11 @@ impl TcpStream {
         self.inner.read_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_read_vectored(&self) -> bool {
+        self.inner.can_read_vectored()
+    }
+
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         let len = cmp::min(buf.len(), <wrlen_t>::max_value() as usize) as wrlen_t;
         let ret = cvt(unsafe {
@@ -277,6 +282,11 @@ impl TcpStream {
         self.inner.write_vectored(bufs)
     }
 
+    #[inline]
+    pub fn can_write_vectored(&self) -> bool {
+        self.inner.can_write_vectored()
+    }
+
     pub fn peer_addr(&self) -> io::Result<SocketAddr> {
         sockname(|buf, len| unsafe { c::getpeername(*self.inner.as_inner(), buf, len) })
     }