1// Copyright (c) 2009 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#ifndef BASE_SAFE_STRERROR_POSIX_H_ 6#define BASE_SAFE_STRERROR_POSIX_H_ 7#pragma once 8 9#include <string> 10 11// BEFORE using anything from this file, first look at PLOG and friends in 12// logging.h and use them instead if applicable. 13// 14// This file declares safe, portable alternatives to the POSIX strerror() 15// function. strerror() is inherently unsafe in multi-threaded apps and should 16// never be used. Doing so can cause crashes. Additionally, the thread-safe 17// alternative strerror_r varies in semantics across platforms. Use these 18// functions instead. 19 20// Thread-safe strerror function with dependable semantics that never fails. 21// It will write the string form of error "err" to buffer buf of length len. 22// If there is an error calling the OS's strerror_r() function then a message to 23// that effect will be printed into buf, truncating if necessary. The final 24// result is always null-terminated. The value of errno is never changed. 25// 26// Use this instead of strerror_r(). 27void safe_strerror_r(int err, char *buf, size_t len); 28 29// Calls safe_strerror_r with a buffer of suitable size and returns the result 30// in a C++ string. 31// 32// Use this instead of strerror(). Note though that safe_strerror_r will be 33// more robust in the case of heap corruption errors, since it doesn't need to 34// allocate a string. 35std::string safe_strerror(int err); 36 37#endif // BASE_SAFE_STRERROR_POSIX_H_ 38