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1 //===- Errno.cpp - errno support --------------------------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file implements the errno wrappers.
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10 //
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11 //===----------------------------------------------------------------------===//
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12
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13 #include "llvm/Support/Errno.h"
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14 #include "llvm/Config/config.h"
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15 #include "llvm/Support/raw_ostream.h"
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16 #include <string.h>
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17
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18 #if HAVE_ERRNO_H
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19 #include <errno.h>
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20 #endif
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21
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22 //===----------------------------------------------------------------------===//
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23 //=== WARNING: Implementation here must contain only TRULY operating system
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24 //=== independent code.
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25 //===----------------------------------------------------------------------===//
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26
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27 namespace llvm {
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28 namespace sys {
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29
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30 #if HAVE_ERRNO_H
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31 std::string StrError() {
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32 return StrError(errno);
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33 }
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34 #endif // HAVE_ERRNO_H
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35
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36 std::string StrError(int errnum) {
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37 std::string str;
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38 if (errnum == 0)
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39 return str;
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40 #if defined(HAVE_STRERROR_R) || HAVE_DECL_STRERROR_S
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41 const int MaxErrStrLen = 2000;
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42 char buffer[MaxErrStrLen];
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43 buffer[0] = '\0';
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44 #endif
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45
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46 #ifdef HAVE_STRERROR_R
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47 // strerror_r is thread-safe.
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48 #if defined(__GLIBC__) && defined(_GNU_SOURCE)
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49 // glibc defines its own incompatible version of strerror_r
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50 // which may not use the buffer supplied.
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51 str = strerror_r(errnum, buffer, MaxErrStrLen - 1);
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52 #else
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53 strerror_r(errnum, buffer, MaxErrStrLen - 1);
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54 str = buffer;
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55 #endif
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56 #elif HAVE_DECL_STRERROR_S // "Windows Secure API"
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57 strerror_s(buffer, MaxErrStrLen - 1, errnum);
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58 str = buffer;
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59 #elif defined(HAVE_STRERROR)
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60 // Copy the thread un-safe result of strerror into
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61 // the buffer as fast as possible to minimize impact
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62 // of collision of strerror in multiple threads.
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63 str = strerror(errnum);
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64 #else
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65 // Strange that this system doesn't even have strerror
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66 // but, oh well, just use a generic message
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67 raw_string_ostream stream(str);
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68 stream << "Error #" << errnum;
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69 stream.flush();
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70 #endif
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71 return str;
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72 }
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73
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74 } // namespace sys
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75 } // namespace llvm
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