| //===- Errno.cpp - errno support --------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the errno wrappers. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Support/Errno.h" |
| #include "llvm/Config/config.h" // Get autoconf configuration settings |
| |
| #if HAVE_STRING_H |
| #include <string.h> |
| |
| #if HAVE_ERRNO_H |
| #include <errno.h> |
| #endif |
| |
| //===----------------------------------------------------------------------===// |
| //=== WARNING: Implementation here must contain only TRULY operating system |
| //=== independent code. |
| //===----------------------------------------------------------------------===// |
| |
| namespace llvm { |
| namespace sys { |
| |
| #if HAVE_ERRNO_H |
| std::string StrError() { |
| return StrError(errno); |
| } |
| #endif // HAVE_ERRNO_H |
| |
| std::string StrError(int errnum) { |
| const int MaxErrStrLen = 2000; |
| char buffer[MaxErrStrLen]; |
| buffer[0] = '\0'; |
| char* str = buffer; |
| #ifdef HAVE_STRERROR_R |
| // strerror_r is thread-safe. |
| if (errnum) |
| # if defined(__GLIBC__) && defined(_GNU_SOURCE) |
| // glibc defines its own incompatible version of strerror_r |
| // which may not use the buffer supplied. |
| str = strerror_r(errnum,buffer,MaxErrStrLen-1); |
| # else |
| strerror_r(errnum,buffer,MaxErrStrLen-1); |
| # endif |
| #elif HAVE_DECL_STRERROR_S // "Windows Secure API" |
| if (errnum) |
| strerror_s(buffer, errnum); |
| #elif defined(HAVE_STRERROR) |
| // Copy the thread un-safe result of strerror into |
| // the buffer as fast as possible to minimize impact |
| // of collision of strerror in multiple threads. |
| if (errnum) |
| strncpy(buffer,strerror(errnum),MaxErrStrLen-1); |
| buffer[MaxErrStrLen-1] = '\0'; |
| #else |
| // Strange that this system doesn't even have strerror |
| // but, oh well, just use a generic message |
| sprintf(buffer, "Error #%d", errnum); |
| #endif |
| return str; |
| } |
| |
| } // namespace sys |
| } // namespace llvm |
| |
| #endif // HAVE_STRING_H |