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Most systems support strerror_r. For the remaining systems (e.g. MSVC) strerror_s and strerror can be used as fallbacks. We don't have a supported operating system/compiler that doesn't provide `strerror`. Close https://github.com/llvm/llvm-project/issues/62804 https://github.com/flang-compiler/f18/pull/1068 added a fallback when strerror is unavailable, but I think the code path is dead. Reviewed By: serge-sans-paille, vzakhari Differential Revision: https://reviews.llvm.org/D151718
69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
//===- Errno.cpp - errno support --------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the errno wrappers.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Errno.h"
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#include "llvm/Config/config.h"
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#include <cstring>
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only TRULY operating system
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//=== independent code.
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//===----------------------------------------------------------------------===//
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namespace llvm {
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namespace sys {
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#if HAVE_ERRNO_H
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std::string StrError() {
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return StrError(errno);
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}
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#endif // HAVE_ERRNO_H
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std::string StrError(int errnum) {
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std::string str;
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if (errnum == 0)
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return str;
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#if defined(HAVE_STRERROR_R) || HAVE_DECL_STRERROR_S
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const int MaxErrStrLen = 2000;
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char buffer[MaxErrStrLen];
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buffer[0] = '\0';
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#endif
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#ifdef HAVE_STRERROR_R
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// strerror_r is thread-safe.
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#if defined(__GLIBC__) && defined(_GNU_SOURCE)
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// glibc defines its own incompatible version of strerror_r
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// which may not use the buffer supplied.
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str = strerror_r(errnum, buffer, MaxErrStrLen - 1);
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#else
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strerror_r(errnum, buffer, MaxErrStrLen - 1);
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str = buffer;
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#endif
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#elif HAVE_DECL_STRERROR_S // "Windows Secure API"
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strerror_s(buffer, MaxErrStrLen - 1, errnum);
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str = buffer;
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#else
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// Copy the thread un-safe result of strerror into
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// the buffer as fast as possible to minimize impact
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// of collision of strerror in multiple threads.
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str = strerror(errnum);
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#endif
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return str;
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}
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} // namespace sys
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} // namespace llvm
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