1 files changed, 53 insertions, 0 deletions
diff --git a/ipc/glue/FileDescriptorUtils.h b/ipc/glue/FileDescriptorUtils.h
new file mode 100644
index 0000000000..e8aab0639e
--- /dev/null
+++ b/ipc/glue/FileDescriptorUtils.h
@@ -0,0 +1,53 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_ipc_FileDescriptorUtils_h
+#define mozilla_ipc_FileDescriptorUtils_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/ipc/FileDescriptor.h"
+#include "nsThreadUtils.h"
+#include <stdio.h>
+
+namespace mozilla {
+namespace ipc {
+
+// When Dispatch() is called (from main thread) this class arranges to close the
+// provided FileDescriptor on one of the socket transport service threads (to
+// avoid main thread I/O).
+class CloseFileRunnable final : public Runnable {
+  typedef mozilla::ipc::FileDescriptor FileDescriptor;
+
+  FileDescriptor mFileDescriptor;
+
+ public:
+  explicit CloseFileRunnable(const FileDescriptor& aFileDescriptor);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIRUNNABLE
+
+  void Dispatch();
+
+ private:
+  ~CloseFileRunnable();
+
+  void CloseFile();
+};
+
+// On failure, FileDescriptorToFILE returns nullptr; on success,
+// returns duplicated FILE*.
+// This is meant for use with FileDescriptors received over IPC.
+FILE* FileDescriptorToFILE(const FileDescriptor& aDesc, const char* aOpenMode);
+
+// FILEToFileDescriptor does not consume the given FILE*; it must be
+// fclose()d as normal, and this does not invalidate the returned
+// FileDescriptor.
+FileDescriptor FILEToFileDescriptor(FILE* aStream);
+
+}  // namespace ipc
+}  // namespace mozilla
+
+#endif  // mozilla_ipc_FileDescriptorUtils_h