Fuchsia: Partial implementation of dart:io sockets

runtime/bin/fdutils_macos.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_MACOS)
 
 #include "bin/fdutils.h"
 
 #include <errno.h>      // NOLINT
@@ skipping 119 matching lines @@
       return -1;
     } else {
       ASSERT(bytes_written > 0);
       remaining -= bytes_written;
       buffer_pos += bytes_written;
     }
   }
   return count;
 }
 
+
+void FDUtils::SaveErrorAndClose(intptr_t fd) {
+  int err = errno;
+  VOID_TEMP_FAILURE_RETRY(close(fd));
+  errno = err;
+}
+
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_MACOS)