Add most of ProcessReader and its test

util/mac/process_reader_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/mac/process_reader.h"
+
+#include <string.h>
+
+#include <string>
+
+#include "base/posix/eintr_wrapper.h"
+#include "build/build_config.h"
+#include "gtest/gtest.h"
+#include "util/file/fd_io.h"
+#include "util/test/mac/mach_multiprocess.h"
+#include "util/test/errors.h"
+
+namespace {
+
+using namespace crashpad;
+using namespace crashpad::test;
+
+TEST(ProcessReader, Self) {
+  ProcessReader process_reader;
+  ASSERT_TRUE(process_reader.Initialize(mach_task_self()));
+
+#if !defined(ARCH_CPU_64_BITS)
+  EXPECT_FALSE(process_reader.Is64Bit());
+#else
+  EXPECT_TRUE(process_reader.Is64Bit());
+#endif
+
+  EXPECT_EQ(getpid(), process_reader.ProcessID());
+  EXPECT_EQ(getppid(), process_reader.ParentProcessID());
+
+  const char kTestMemory[] = "Some test memory";
+  char buffer[arraysize(kTestMemory)];
+  ASSERT_TRUE(process_reader.Memory()->Read(
+      reinterpret_cast<mach_vm_address_t>(kTestMemory),
+      sizeof(kTestMemory),
+      &buffer));
+  EXPECT_STREQ(kTestMemory, buffer);
+}
+
+class ProcessReaderChild final : public MachMultiprocess {
+ public:
+  ProcessReaderChild() : MachMultiprocess() {}
+
+  ~ProcessReaderChild() {}
+
+ protected:
+  void Parent() override {
+    ProcessReader process_reader;
+    ASSERT_TRUE(process_reader.Initialize(ChildTask()));
+
+#if !defined(ARCH_CPU_64_BITS)
+    EXPECT_FALSE(process_reader.Is64Bit());
+#else
+    EXPECT_TRUE(process_reader.Is64Bit());
+#endif
+
+    EXPECT_EQ(getpid(), process_reader.ParentProcessID());
+
+    int fd = PipeFD();
+
+    pid_t pid;
+    ssize_t rv = ReadFD(fd, &pid, sizeof(pid));

[Robert Sesek, 2014/08/21 15:26:54]

Couldn't you rely on MachMultiprocess::ChildPid()?

[Mark Mentovai, 2014/08/21 21:40:52]

rsesek wrote:
Yes, but this was also testing that ChildPID() worked correctly. I guess that
should happen in mach_multiprocess_test.

+    ASSERT_EQ(static_cast<ssize_t>(sizeof(pid)), rv) << ErrnoMessage("read");
+
+    EXPECT_EQ(pid, process_reader.ProcessID());
+
+    mach_vm_address_t address;
+    rv = ReadFD(fd, &address, sizeof(address));
+    ASSERT_EQ(static_cast<ssize_t>(sizeof(address)), rv)
+        << ErrnoMessage("read");
+
+    std::string read_string;
+    ASSERT_TRUE(process_reader.Memory()->ReadCString(address, &read_string));
+    EXPECT_EQ("Read me from another process", read_string);
+  }
+
+  void Child() override {
+    int fd = PipeFD();
+
+    pid_t pid = getpid();
+    ssize_t rv = WriteFD(fd, &pid, sizeof(pid));
+    ASSERT_EQ(static_cast<ssize_t>(sizeof(pid)), rv) << ErrnoMessage("write");
+
+    const char kTestMemory[] = "Read me from another process";

[Robert Sesek, 2014/08/21 15:26:54]

Make this a static member that can be used by both Parent() and Child()?

+    mach_vm_address_t address =
+        reinterpret_cast<mach_vm_address_t>(kTestMemory);
+    rv = WriteFD(fd, &address, sizeof(address));
+    ASSERT_EQ(static_cast<ssize_t>(sizeof(address)), rv)
+        << ErrnoMessage("write");
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ProcessReaderChild);
+};
+
+TEST(ProcessReader, Child) {
+  ProcessReaderChild process_reader;
+  process_reader.Run();
+}

[Robert Sesek, 2014/08/21 15:26:54]

No test for threads of another process?

+
+}  // namespace