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/*
* Copyright (C) 2021 Red Hat Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/Forward.h>
namespace WTF {
// This is strerror, except it is threadsafe. The problem with normal strerror is it returns a
// pointer to static storage, and it may actually modify that storage, so it can never be used in
// any multithreaded application, or any library that may be linked to a multithreaded application.
// (Why does it modify its storage? So that it can append the error number to the error string, as
// in "Unknown error n." Also, because it will localize the error message.) The standard
// alternatives are strerror_s and strerror_r, but both have problems. strerror_s is specified by
// C11, but not by C++ (as of C++20), and it is optional so glibc decided to ignore it. We can only
// rely on it to exist on Windows. Then strerror_r is even worse. First, it doesn't exist at all on
// Windows. Second, the GNU version is incompatible with the POSIX version, and it is impossible to
// use correctly unless you know which version you have. Both strerror_s and strerror_r are
// cumbersome because they force you to allocate the buffer for the result manually. It's all such a
// mess that we should deal with the complexity here rather than elsewhere in WebKit.
WTF_EXPORT_PRIVATE CString safeStrerror(int errnum);
}
using WTF::safeStrerror;
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