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diff --git a/base/safe_strerror_posix.h b/base/safe_strerror_posix.h
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+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_SAFE_STRERROR_POSIX_H_
+#define BASE_SAFE_STRERROR_POSIX_H_
+
+#include <string>
+
+// BEFORE using anything from this file, first look at PLOG and friends in
+// logging.h and use them instead if applicable.
+//
+// This file declares safe, portable alternatives to the POSIX strerror()
+// function. strerror() is inherently unsafe in multi-threaded apps and should
+// never be used. Doing so can cause crashes. Additionally, the thread-safe
+// alternative strerror_r varies in semantics across platforms. Use these
+// functions instead.
+
+// Thread-safe strerror function with dependable semantics that never fails.
+// It will write the string form of error "err" to buffer buf of length len.
+// If there is an error calling the OS's strerror_r() function then a message to
+// that effect will be printed into buf, truncating if necessary. The final
+// result is always null-terminated. The value of errno is never changed.
+//
+// Use this instead of strerror_r().
+void safe_strerror_r(int err, char *buf, size_t len);
+
+// Calls safe_strerror_r with a buffer of suitable size and returns the result
+// in a C++ string.
+//
+// Use this instead of strerror(). Note though that safe_strerror_r will be
+// more robust in the case of heap corruption errors, since it doesn't need to
+// allocate a string.
+std::string safe_strerror(int err);
+
+#endif  // BASE_SAFE_STRERROR_POSIX_H_