1 files changed, 74 insertions, 0 deletions
diff --git a/mojo/edk/embedder/platform_handle.cc b/mojo/edk/embedder/platform_handle.cc
new file mode 100644
index 0000000000..b6b2cd22d1
--- /dev/null
+++ b/mojo/edk/embedder/platform_handle.cc
@@ -0,0 +1,74 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mojo/edk/embedder/platform_handle.h"
+
+#include "build/build_config.h"
+#if defined(OS_POSIX)
+#include <unistd.h>
+#elif defined(OS_WIN)
+#include <windows.h>
+#else
+#error "Platform not yet supported."
+#endif
+
+#include "base/logging.h"
+
+namespace mojo {
+namespace edk {
+
+void PlatformHandle::CloseIfNecessary() {
+  if (!is_valid())
+    return;
+
+#if defined(OS_POSIX)
+  if (type == Type::POSIX) {
+    bool success = (close(handle) == 0);
+    DPCHECK(success);
+    handle = -1;
+  }
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+  else if (type == Type::MACH) {
+    kern_return_t rv = mach_port_deallocate(mach_task_self(), port);
+    DPCHECK(rv == KERN_SUCCESS);
+    port = MACH_PORT_NULL;
+  }
+#endif  // defined(OS_MACOSX) && !defined(OS_IOS)
+#elif defined(OS_WIN)
+  if (owning_process != base::GetCurrentProcessHandle()) {
+    // This handle may have been duplicated to a new target process but not yet
+    // sent there. In this case CloseHandle should NOT be called. From MSDN
+    // documentation for DuplicateHandle[1]:
+    //
+    //    Normally the target process closes a duplicated handle when that
+    //    process is finished using the handle. To close a duplicated handle
+    //    from the source process, call DuplicateHandle with the following
+    //    parameters:
+    //
+    //    * Set hSourceProcessHandle to the target process from the
+    //      call that created the handle.
+    //    * Set hSourceHandle to the duplicated handle to close.
+    //    * Set lpTargetHandle to NULL.
+    //    * Set dwOptions to DUPLICATE_CLOSE_SOURCE.
+    //
+    // [1] https://msdn.microsoft.com/en-us/library/windows/desktop/ms724251
+    //
+    // NOTE: It's possible for this operation to fail if the owning process
+    // was terminated or is in the process of being terminated. Either way,
+    // there is nothing we can reasonably do about failure, so we ignore it.
+    DuplicateHandle(owning_process, handle, NULL, &handle, 0, FALSE,
+                    DUPLICATE_CLOSE_SOURCE);
+    return;
+  }
+
+  bool success = !!CloseHandle(handle);
+  DPCHECK(success);
+  handle = INVALID_HANDLE_VALUE;
+#else
+#error "Platform not yet supported."
+#endif
+}
+
+}  // namespace edk
+}  // namespace mojo