[io] Hide more unsafe natives.

TEST=lib/mirrors/invocation_fuzz_test/smi
CoreLibraryReviewExempt: does not change public API
Bug: #60721
Change-Id: Ica2cba560751532918fe72c3419cb76c1d115259
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/429222
Commit-Queue: Ryan Macnak <[email protected]>
Reviewed-by: Brian Quinlan <[email protected]>

Author: rmacnak-google

sdk/lib/_internal/vm/bin/file_patch.dart

@@ -284,7 +284,7 @@ abstract class _FileSystemWatcher {
   }
 
   static Stream _listenOnSocket(int socketId, int id, int pathId) {
-    final nativeSocket = _NativeSocket.watch(socketId);
+    final nativeSocket = _NativeSocket._watch(socketId);
     final rawSocket = _RawSocket(nativeSocket);
     return rawSocket.expand((event) {
       var stops = [];

sdk/lib/_internal/vm/bin/process_patch.dart

@@ -119,7 +119,7 @@ class _SignalController {
       return;
     }
     _id = id;
-    var socket = _RawSocket(_NativeSocket.watchSignal(id));
+    var socket = _RawSocket(_NativeSocket._watchSignal(id));
     socket.listen((event) {
       if (event == RawSocketEvent.read) {
         var bytes = socket.read()!;

sdk/lib/_internal/vm/bin/socket_patch.dart

@@ -1280,10 +1280,10 @@ base class _NativeSocket extends _NativeSocketNativeWrapper
     _nativeSetSocketId(id, typeFlags);
   }
 
-  _NativeSocket.watchSignal(int id)
+  _NativeSocket._watchSignal(int id)
     : this._watchCommon(id, typeInternalSignalSocket);
 
-  _NativeSocket.watch(int id) : this._watchCommon(id, typeInternalSocket);
+  _NativeSocket._watch(int id) : this._watchCommon(id, typeInternalSocket);
 
   bool get isListening => (typeFlags & typeListeningSocket) != 0;
   bool get isPipe => (typeFlags & typePipe) != 0;

sdk/lib/_internal/vm/bin/stdio_patch.dart

@@ -38,7 +38,7 @@ class _StdIOUtils {
         type,
       );
     }
-    return Stdout._(IOSink(_StdConsumer(fd)), fd);
+    return Stdout._(IOSink(_StdConsumer._(fd)), fd);
   }
 
   @patch

sdk/lib/io/file_impl.dart

@@ -211,7 +211,7 @@ class _FileStreamConsumer implements StreamConsumer<List<int>> {
     : _file = file,
       _openFuture = file.open(mode: mode);
 
-  _FileStreamConsumer.fromStdio(int fd)
+  _FileStreamConsumer._fromStdio(int fd)
     : _openFuture = new Future.value(_File._openStdioSync(fd));
 
   _FileStreamConsumer.fromRandomAccessFile(RandomAccessFile f)

sdk/lib/io/stdio.dart

@@ -280,7 +280,7 @@ class Stdout extends _StdSink implements IOSink {
   /// The returned `IOSink` will be initialized with an [encoding] of UTF-8 and
   /// will not do line ending conversion.
   IOSink get nonBlocking {
-    return _nonBlocking ??= new IOSink(new _FileStreamConsumer.fromStdio(_fd));
+    return _nonBlocking ??= new IOSink(new _FileStreamConsumer._fromStdio(_fd));
   }
 }
 
@@ -317,7 +317,7 @@ class StdinException implements IOException {
 class _StdConsumer implements StreamConsumer<List<int>> {
   final RandomAccessFile _file;
 
-  _StdConsumer(int fd) : _file = _File._openStdioSync(fd);
+  _StdConsumer._(int fd) : _file = _File._openStdioSync(fd);
 
   Future addStream(Stream<List<int>> stream) {
     var completer = new Completer();