Add TaskMemory, which can read another Mach task’s memory, and its test

util/test/mac/mach_errors.cc

Index: util/test/mac/mach_errors.cc
diff --git a/util/test/mac/mach_errors.cc b/util/test/mac/mach_errors.cc
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index 0000000000000000000000000000000000000000..54fd607251e47531ff5fccab068ffad5d2577e6a
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+++ b/util/test/mac/mach_errors.cc
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+// 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_errors.h"
+
+#include <servers/bootstrap.h>
+
+#include "base/safe_strerror_posix.h"
+#include "base/strings/stringprintf.h"
+
+namespace {
+
+std::string FormatBase(const std::string& base) {
+  if (base.empty()) {
+    return std::string();
+  }
+
+  return base::StringPrintf("%s: ", base.c_str());
+}
+
+std::string FormatMachErrorNumber(mach_error_t mach_err) {
+  // For the os/kern subsystem, give the error number in decimal as in
+  // <mach/kern_return.h>. Otherwise, give it in hexadecimal to make it easier
+  // to visualize the various bits. See <mach/error.h>.
+  if (mach_err >= 0 && mach_err < KERN_RETURN_MAX) {
+    return base::StringPrintf(" (%d)", mach_err);
+  }
+  return base::StringPrintf(" (0x%08x)", mach_err);
+}
+
+}  // namespace
+
+namespace crashpad {
+namespace test {
+
+std::string MachErrorMessage(mach_error_t mach_err, const std::string& base) {
+  return base::StringPrintf("%s%s%s",
+                            FormatBase(base).c_str(),
+                            mach_error_string(mach_err),
+                            FormatMachErrorNumber(mach_err).c_str());
+}
+
+std::string BootstrapErrorMessage(kern_return_t bootstrap_err,
+                                  const std::string& base) {
+  switch (bootstrap_err) {
+    case BOOTSTRAP_SUCCESS:
+    case BOOTSTRAP_NOT_PRIVILEGED:
+    case BOOTSTRAP_NAME_IN_USE:
+    case BOOTSTRAP_UNKNOWN_SERVICE:
+    case BOOTSTRAP_SERVICE_ACTIVE:
+    case BOOTSTRAP_BAD_COUNT:
+    case BOOTSTRAP_NO_MEMORY:
+    case BOOTSTRAP_NO_CHILDREN:
+      // Show known bootstrap errors in decimal because that's how they're
+      // defined in <servers/bootstrap.h>.
+      return base::StringPrintf("%s%s (%d)",
+                                FormatBase(base).c_str(),
+                                bootstrap_strerror(bootstrap_err),
+                                bootstrap_err);
+
+    default:
+      return MachErrorMessage(bootstrap_err, base);
+  }
+}
+
+}  // namespace test
+}  // namespace crashpad