77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
//===- Errno.cpp - errno support --------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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" // Get autoconf configuration settings
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#include "llvm/Support/raw_ostream.h"
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#include <string.h>
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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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#elif defined(HAVE_STRERROR)
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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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#else
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// Strange that this system doesn't even have strerror
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// but, oh well, just use a generic message
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raw_string_ostream stream(str);
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stream << "Error #" << errnum;
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stream.flush();
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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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