hanchenye-llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_errno.h

//===-- sanitizer_errno.h ---------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is shared between sanitizers run-time libraries.
//
// Defines errno to avoid including errno.h and its dependencies into sensitive
// files (e.g. interceptors are not supposed to include any system headers).
// It's ok to use errno.h directly when your file already depend on other system
// includes though.
//
//===----------------------------------------------------------------------===//

#ifndef SANITIZER_ERRNO_H
#define SANITIZER_ERRNO_H

#include "sanitizer_errno_codes.h"
#include "sanitizer_platform.h"

#if SANITIZER_FREEBSD || SANITIZER_MAC
#  define __errno_location __error
#elif SANITIZER_ANDROID || SANITIZER_NETBSD || SANITIZER_OPENBSD
#  define __errno_location __errno
#elif SANITIZER_SOLARIS
#  define __errno_location ___errno
#elif SANITIZER_WINDOWS
#  define __errno_location _errno
#endif

extern "C" int *__errno_location();

#define errno (*__errno_location())

#endif  // SANITIZER_ERRNO_H