Auto merge of #37702 - redox-os:redox, r=brson

Redox Support Preview

# Important - This is only a preview of a working `sys::redox`.

Compiling the Redox default distribution with this `libstd` results in a fully functioning distribution. As such, all further changes would be cosmetic or implementing features that have not been used by the default distribution (of which there are only a small number).

I do not expect this to be merged, but would like to discuss how it may be improved and get feedback.

There are a few `unimplemented!()` - `cloexec` for example. I have documented them below. These would be resolved before desiring a merge.

There are also issues with how the Redox syscall library is called - currently I am using a re-export in `libc` but that probably would not be desired.

1 files changed, 12 insertions, 1 deletions

diff --git a/src/libstd/sys/windows/stdio.rs b/src/libstd/sys/windows/stdio.rs
index 72788776ded..a74e7699ba0 100644
--- a/src/libstd/sys/windows/stdio.rs
+++ b/src/libstd/sys/windows/stdio.rs
@@ -156,6 +156,10 @@ impl Stdout {
     pub fn write(&self, data: &[u8]) -> io::Result<usize> {
         write(&self.0, data)
     }
+
+    pub fn flush(&self) -> io::Result<()> {
+        Ok(())
+    }
 }
 
 impl Stderr {
@@ -166,6 +170,10 @@ impl Stderr {
     pub fn write(&self, data: &[u8]) -> io::Result<usize> {
         write(&self.0, data)
     }
+
+    pub fn flush(&self) -> io::Result<()> {
+        Ok(())
+    }
 }
 
 // FIXME: right now this raw stderr handle is used in a few places because
@@ -175,7 +183,10 @@ impl io::Write for Stderr {
     fn write(&mut self, data: &[u8]) -> io::Result<usize> {
         Stderr::write(self, data)
     }
-    fn flush(&mut self) -> io::Result<()> { Ok(()) }
+
+    fn flush(&mut self) -> io::Result<()> {
+        Stderr::flush(self)
+    }
 }
 
 impl NoClose {