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(). 27 void 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. 35 std::string safe_strerror(int err); 36 37 #endif // BASE_SAFE_STRERROR_POSIX_H_ 38
