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annotate lib/Support/Errno.cpp @ 77:54457678186b LLVM3.6

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents 95c75e76d11b
children 60c9769439b8
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1 //===- Errno.cpp - errno support --------------------------------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements the errno wrappers.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/Support/Errno.h"
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15 #include "llvm/Config/config.h" // Get autoconf configuration settings
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16 #include "llvm/Support/raw_ostream.h"
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17 #include <string.h>
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18
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19 #if HAVE_ERRNO_H
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20 #include <errno.h>
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21 #endif
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22
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23 //===----------------------------------------------------------------------===//
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24 //=== WARNING: Implementation here must contain only TRULY operating system
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25 //=== independent code.
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26 //===----------------------------------------------------------------------===//
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27
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28 namespace llvm {
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29 namespace sys {
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30
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31 #if HAVE_ERRNO_H
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32 std::string StrError() {
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33 return StrError(errno);
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34 }
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35 #endif // HAVE_ERRNO_H
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36
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37 std::string StrError(int errnum) {
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38 const int MaxErrStrLen = 2000;
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39 char buffer[MaxErrStrLen];
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40 buffer[0] = '\0';
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41 std::string str;
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42 if (errnum == 0)
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43 return str;
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44
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45 #ifdef HAVE_STRERROR_R
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46 // strerror_r is thread-safe.
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47 #if defined(__GLIBC__) && defined(_GNU_SOURCE)
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48 // glibc defines its own incompatible version of strerror_r
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49 // which may not use the buffer supplied.
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50 str = strerror_r(errnum, buffer, MaxErrStrLen - 1);
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51 #else
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52 strerror_r(errnum, buffer, MaxErrStrLen - 1);
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53 str = buffer;
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54 #endif
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55 #elif HAVE_DECL_STRERROR_S // "Windows Secure API"
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56 strerror_s(buffer, MaxErrStrLen - 1, errnum);
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57 str = buffer;
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58 #elif defined(HAVE_STRERROR)
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59 // Copy the thread un-safe result of strerror into
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60 // the buffer as fast as possible to minimize impact
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61 // of collision of strerror in multiple threads.
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62 str = strerror(errnum);
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63 #else
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64 // Strange that this system doesn't even have strerror
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65 // but, oh well, just use a generic message
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66 raw_string_ostream stream(str);
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67 stream << "Error #" << errnum;
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68 stream.flush();
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69 #endif
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70 return str;
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71 }
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72
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73 } // namespace sys
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74 } // namespace llvm