ipc/gtest/TestUnsafeSharedMemoryHandle.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "chrome/common/ipc_message.h"
   8 #include "chrome/common/ipc_message_utils.h"
   9 #include "gtest/gtest.h"
  10
  11 #include "mozilla/RandomNum.h"
  12 #include "mozilla/ipc/RawShmem.h"
  13
  14 namespace mozilla::ipc {
  15
  16 static bool SerializeAndDeserialize(UnsafeSharedMemoryHandle&& aIn,
  17                                     UnsafeSharedMemoryHandle* aOut) {
  18   IPC::Message msg(MSG_ROUTING_NONE, 0);
  19   {
  20     IPC::MessageWriter writer(msg);
  21     IPC::WriteParam(&writer, std::move(aIn));
  22   }
  23
  24   IPC::MessageReader reader(msg);
  25   return IPC::ReadParam(&reader, aOut);
  26 }
  27
  28 void TestUnsafeSharedMemoryHandle(size_t aSize) {
  29   auto maybeHandle = UnsafeSharedMemoryHandle::CreateAndMap(aSize);
  30   ASSERT_TRUE(maybeHandle);
  31   auto [handle, mapping] = maybeHandle.extract();
  32
  33   EXPECT_EQ(mapping.Size(), aSize);
  34
  35   auto inBytes = mapping.Bytes();
  36   for (size_t i = 0; i < aSize; ++i) {
  37     inBytes[i] = static_cast<uint8_t>(i % 255);
  38   }
  39
  40   UnsafeSharedMemoryHandle out;
  41   ASSERT_TRUE(SerializeAndDeserialize(std::move(handle), &out));
  42
  43   auto mapping2 = WritableSharedMemoryMapping::Open(std::move(out)).value();
  44
  45   EXPECT_EQ(mapping2.Size(), aSize);
  46   auto outBytes = mapping2.Bytes();
  47   for (size_t i = 0; i < aSize; ++i) {
  48     EXPECT_EQ(outBytes[i], static_cast<uint8_t>(i % 255));
  49   }
  50 }
  51
  52 TEST(UnsafeSharedMemoryHandle, Empty)
  53 { TestUnsafeSharedMemoryHandle(0); }
  54
  55 TEST(UnsafeSharedMemoryHandle, SmallSize)
  56 { TestUnsafeSharedMemoryHandle(2048); }
  57
  58 }  // namespace mozilla::ipc