1 //===- Errno.cpp - errno support --------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the errno wrappers.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Support/Errno.h"
15 #include "llvm/Config/config.h" // Get autoconf configuration settings
16 #include "llvm/Support/raw_ostream.h"
23 //===----------------------------------------------------------------------===//
24 //=== WARNING: Implementation here must contain only TRULY operating system
25 //=== independent code.
26 //===----------------------------------------------------------------------===//
32 std::string StrError() {
33 return StrError(errno);
35 #endif // HAVE_ERRNO_H
37 std::string StrError(int errnum) {
38 const int MaxErrStrLen = 2000;
39 char buffer[MaxErrStrLen];
45 #ifdef HAVE_STRERROR_R
46 // strerror_r is thread-safe.
47 #if defined(__GLIBC__) && defined(_GNU_SOURCE)
48 // glibc defines its own incompatible version of strerror_r
49 // which may not use the buffer supplied.
50 str = strerror_r(errnum, buffer, MaxErrStrLen - 1);
52 strerror_r(errnum, buffer, MaxErrStrLen - 1);
55 #elif HAVE_DECL_STRERROR_S // "Windows Secure API"
56 strerror_s(buffer, MaxErrStrLen - 1, errnum);
58 #elif defined(HAVE_STRERROR)
59 // Copy the thread un-safe result of strerror into
60 // the buffer as fast as possible to minimize impact
61 // of collision of strerror in multiple threads.
62 str = strerror(errnum);
64 // Strange that this system doesn't even have strerror
65 // but, oh well, just use a generic message
66 raw_string_ostream stream(str);
67 stream << "Error #" << errnum;