// Copyright (c) 2011 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>#include "base/base_export.h"// 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().BASE_EXPORTvoidsafe_strerror_r(interr,char*buf,size_tlen);// 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.BASE_EXPORTstd::stringsafe_strerror(interr);#endif // BASE_SAFE_STRERROR_POSIX_H_