std: Add `{read,write}_vectored` for more types

This commit implements the `{read,write}_vectored` methods on more types
in the standard library, namely:

* `std::fs::File`
* `std::process::ChildStd{in,out,err}`
* `std::io::Std{in,out,err}`
* `std::io::Std{in,out,err}Lock`
* `std::io::Std{in,out,err}Raw`

Where supported the OS implementations hook up to native support,
otherwise it falls back to the already-defaulted implementation.

1 files changed, 15 insertions, 1 deletions

diff --git a/src/libstd/process.rs b/src/libstd/process.rs
index e0c9b7cad86..ef5626700e8 100644
--- a/src/libstd/process.rs
+++ b/src/libstd/process.rs
@@ -111,7 +111,7 @@ use crate::io::prelude::*;
 use crate::ffi::OsStr;
 use crate::fmt;
 use crate::fs;
-use crate::io::{self, Initializer};
+use crate::io::{self, Initializer, IoVec, IoVecMut};
 use crate::path::Path;
 use crate::str;
 use crate::sys::pipe::{read2, AnonPipe};
@@ -225,6 +225,10 @@ impl Write for ChildStdin {
         self.inner.write(buf)
     }
 
+    fn write_vectored(&mut self, bufs: &[IoVec<'_>]) -> io::Result<usize> {
+        self.inner.write_vectored(bufs)
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         Ok(())
     }
@@ -271,6 +275,11 @@ impl Read for ChildStdout {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
         self.inner.read(buf)
     }
+
+    fn read_vectored(&mut self, bufs: &mut [IoVecMut<'_>]) -> io::Result<usize> {
+        self.inner.read_vectored(bufs)
+    }
+
     #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
@@ -318,6 +327,11 @@ impl Read for ChildStderr {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
         self.inner.read(buf)
     }
+
+    fn read_vectored(&mut self, bufs: &mut [IoVecMut<'_>]) -> io::Result<usize> {
+        self.inner.read_vectored(bufs)
+    }
+
     #[inline]
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()