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

util/test/errors.h

Index: util/test/errors.h
diff --git a/util/test/errors.h b/util/test/errors.h
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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.
+
+#ifndef CRASHPAD_UTIL_TEST_ERRORS_H_
+#define CRASHPAD_UTIL_TEST_ERRORS_H_
+
+#include <string>
+
+namespace crashpad {
+namespace test {
+
+// These functions format messages in a similar way to the PLOG and PCHECK
+// family of logging macros in base/logging.h. They exist to interoperate with
+// gtest assertions, which don’t interoperate with logging but can be streamed
+// to.
+//
+// Where non-test code could do:
+//   PCHECK(rv == 0) << "close";
+// gtest-based test code can do:
+//   EXPECT_EQ(0, rv) << ErrnoMessage("close");
+
+//! \brief Formats an error message using an `errno` value.
+//!
+//! The returned string will combine the \a base string, if supplied, with a
+//! a textual and numeric description of the error.
+//!
+//! The message is formatted using `strerror()`. \a err may be `0` or outside of
+//! the range of known error codes, and the message returned will contain the
+//! string that `strerror()` uses in these cases.
+//!
+//! \param[in] err The error code, usable as an `errno` value.
+//! \param[in] base A string to prepend to the error description.
+//!
+//! \return A string of the format `"Operation not permitted (1)"` if \a err has
+//!     the value `EPERM` on a system where this is defined to be `1`. If \a
+//!     base is not empty, it will be prepended to this string, separated by a
+//!     colon.
+std::string ErrnoMessage(int err, const std::string& base = std::string());
+
+//! \brief Formats an error message using `errno`.
+//!
+//! The returned string will combine the \a base string, if supplied, with a
+//! a textual and numeric description of the error.
+//!
+//! The message is formatted using `strerror()`. `errno` may be `0` or outside
+//! of the range of known error codes, and the message returned will contain the
+//! string that `strerror()` uses in these cases.
+//!
+//! \param[in] base A string to prepend to the error description.
+//!
+//! \return A string of the format `"Operation not permitted (1)"` if `errno`
+//!     has the value `EPERM` on a system where this is defined to be `1`. If
+//!     \a base is not empty, it will be prepended to this string, separated by
+//!     a colon.
+std::string ErrnoMessage(const std::string& base = std::string());
+
+}  // namespace test
+}  // namespace crashpad
+
+#endif  // CRASHPAD_UTIL_TEST_ERRORS_H_