Add MachMultiprocess and its test

util/test/mac/mach_multiprocess_test.cc

+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "util/test/mac/mach_multiprocess.h"
+
+#include "base/basictypes.h"
+#include "gtest/gtest.h"
+#include "util/file/fd_io.h"
+#include "util/test/errors.h"
+
+namespace {
+
+using namespace crashpad;
+using namespace crashpad::test;
+
+class TestMachMultiprocess final : public MachMultiprocess {
+ public:
+  TestMachMultiprocess() : MachMultiprocess() {}
+
+  ~TestMachMultiprocess() {}
+
+ protected:
+  // The base class will have already exercised the Mach ports for IPC and the
+  // child task port. Just make sure that the pipe is set up correctly.
+  virtual void Parent() override {
+    int fd = PipeFD();
+
+    char c;
+    ssize_t rv = ReadFD(fd, &c, 1);
+    ASSERT_EQ(1, rv) << ErrnoMessage("read");
+    EXPECT_EQ('M', c);
+
+    // The child will close its end of the pipe and exit. Make sure that the
+    // parent sees EOF.
+    rv = ReadFD(fd, &c, 1);
+    ASSERT_EQ(0, rv) << ErrnoMessage("read");
+  }
+
+  virtual void Child() override {
+    int fd = PipeFD();
+
+    char c = 'M';
+    ssize_t rv = WriteFD(fd, &c, 1);
+    ASSERT_EQ(1, rv) << ErrnoMessage("write");
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestMachMultiprocess);
+};
+
+TEST(MachMultiprocess, MachMultiprocess) {
+  TestMachMultiprocess mach_multiprocess;
+  mach_multiprocess.Run();
+}
+
+}  // namespace