45 lines
1.6 KiB
C++
45 lines
1.6 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_POSIX_SAFE_STRERROR_H_
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#define BASE_POSIX_SAFE_STRERROR_H_
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#include <stddef.h>
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#include <string>
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#include "base/base_export.h"
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namespace base {
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// BEFORE using anything from this file, first look at PLOG and friends in
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// logging.h and use them instead if applicable.
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//
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// This file declares safe, portable alternatives to the POSIX strerror()
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// function. strerror() is inherently unsafe in multi-threaded apps and should
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// never be used. Doing so can cause crashes. Additionally, the thread-safe
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// alternative strerror_r varies in semantics across platforms. Use these
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// functions instead.
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// Thread-safe strerror function with dependable semantics that never fails.
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// It will write the string form of error "err" to buffer buf of length len.
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// If there is an error calling the OS's strerror_r() function then a message to
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// that effect will be printed into buf, truncating if necessary. The final
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// result is always null-terminated. The value of errno is never changed.
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//
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// Use this instead of strerror_r().
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BASE_EXPORT void safe_strerror_r(int err, char *buf, size_t len);
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// Calls safe_strerror_r with a buffer of suitable size and returns the result
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// in a C++ string.
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//
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// Use this instead of strerror(). Note though that safe_strerror_r will be
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// more robust in the case of heap corruption errors, since it doesn't need to
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// allocate a string.
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BASE_EXPORT std::string safe_strerror(int err);
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} // namespace base
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#endif // BASE_POSIX_SAFE_STRERROR_H_
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