libc/src/errno/errno_location.cpp

   1 //===-- Implementation of __errno_location --------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/errno/llvmlibc_errno.h"
  10
  11 #include "src/__support/common.h"
  12
  13 namespace __llvm_libc {
  14
  15 static thread_local int __errno = 0;
  16
  17 // __errno_location is not really an entry point but we still want it to behave
  18 // like an entry point because the errno macro resolves to the C symbol
  19 // "__errno_location".
  20 int *LLVM_LIBC_ENTRYPOINT(__errno_location)() { return &__errno; }
  21
  22 } // namespace __llvm_libc