Rollup merge of rust-lang#59512 - euclio:stdio-locks, r=sfackler

implement `AsRawFd` for stdio locks

cc rust-lang/rfcs#2074.

Author: Centril

src/libstd/sys/redox/ext/io.rs

@@ -115,6 +115,21 @@ impl AsRawFd for io::Stderr {
     fn as_raw_fd(&self) -> RawFd { 2 }
 }
 
+#[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
+impl<'a> AsRawFd for io::StdinLock<'a> {
+    fn as_raw_fd(&self) -> RawFd { 0 }
+}
+
+#[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
+impl<'a> AsRawFd for io::StdoutLock<'a> {
+    fn as_raw_fd(&self) -> RawFd { 1 }
+}
+
+#[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
+impl<'a> AsRawFd for io::StderrLock<'a> {
+    fn as_raw_fd(&self) -> RawFd { 2 }
+}
+
 #[stable(feature = "from_raw_os", since = "1.1.0")]
 impl FromRawFd for net::TcpStream {
     unsafe fn from_raw_fd(fd: RawFd) -> net::TcpStream {

src/libstd/sys/unix/ext/io.rs

@@ -95,3 +95,18 @@ impl AsRawFd for io::Stdout {
 impl AsRawFd for io::Stderr {
     fn as_raw_fd(&self) -> RawFd { libc::STDERR_FILENO }
 }
+
+#[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
+impl<'a> AsRawFd for io::StdinLock<'a> {
+    fn as_raw_fd(&self) -> RawFd { libc::STDIN_FILENO }
+}
+
+#[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
+impl<'a> AsRawFd for io::StdoutLock<'a> {
+    fn as_raw_fd(&self) -> RawFd { libc::STDOUT_FILENO }
+}
+
+#[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
+impl<'a> AsRawFd for io::StderrLock<'a> {
+    fn as_raw_fd(&self) -> RawFd { libc::STDERR_FILENO }
+}

src/libstd/sys/windows/ext/io.rs

@@ -83,6 +83,27 @@ impl AsRawHandle for io::Stderr {
     }
 }
 
+#[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
+impl<'a> AsRawHandle for io::StdinLock<'a> {
+    fn as_raw_handle(&self) -> RawHandle {
+        unsafe { c::GetStdHandle(c::STD_INPUT_HANDLE) as RawHandle }
+    }
+}
+
+#[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
+impl<'a> AsRawHandle for io::StdoutLock<'a> {
+    fn as_raw_handle(&self) -> RawHandle {
+        unsafe { c::GetStdHandle(c::STD_OUTPUT_HANDLE) as RawHandle }
+    }
+}
+
+#[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
+impl<'a> AsRawHandle for io::StderrLock<'a> {
+    fn as_raw_handle(&self) -> RawHandle {
+        unsafe { c::GetStdHandle(c::STD_ERROR_HANDLE) as RawHandle }
+    }
+}
+
 #[stable(feature = "from_raw_os", since = "1.1.0")]
 impl FromRawHandle for fs::File {
     unsafe fn from_raw_handle(handle: RawHandle) -> fs::File {