1 //===- Errno.cpp - errno support --------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the errno wrappers. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/Support/Errno.h" 15 #include "llvm/Config/config.h" // Get autoconf configuration settings 16 #include "llvm/Support/raw_ostream.h" 17 18 #if HAVE_STRING_H 19 #include <string.h> 20 21 #if HAVE_ERRNO_H 22 #include <errno.h> 23 #endif 24 25 //===----------------------------------------------------------------------===// 26 //=== WARNING: Implementation here must contain only TRULY operating system 27 //=== independent code. 28 //===----------------------------------------------------------------------===// 29 30 namespace llvm { 31 namespace sys { 32 33 #if HAVE_ERRNO_H 34 std::string StrError() { 35 return StrError(errno); 36 } 37 #endif // HAVE_ERRNO_H 38 39 std::string StrError(int errnum) { 40 const int MaxErrStrLen = 2000; 41 char buffer[MaxErrStrLen]; 42 buffer[0] = '\0'; 43 std::string str; 44 #ifdef HAVE_STRERROR_R 45 // strerror_r is thread-safe. 46 if (errnum) 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); 51 # else 52 strerror_r(errnum,buffer,MaxErrStrLen-1); 53 str = buffer; 54 # endif 55 #elif HAVE_DECL_STRERROR_S // "Windows Secure API" 56 if (errnum) { 57 strerror_s(buffer, MaxErrStrLen - 1, errnum); 58 str = buffer; 59 } 60 #elif defined(HAVE_STRERROR) 61 // Copy the thread un-safe result of strerror into 62 // the buffer as fast as possible to minimize impact 63 // of collision of strerror in multiple threads. 64 if (errnum) 65 str = strerror(errnum); 66 #else 67 // Strange that this system doesn't even have strerror 68 // but, oh well, just use a generic message 69 raw_string_ostream stream(str); 70 stream << "Error #" << errnum; 71 stream.flush(); 72 #endif 73 return str; 74 } 75 76 } // namespace sys 77 } // namespace llvm 78 79 #endif // HAVE_STRING_H 80
