libc/test/loader/linux/tls_test.cpp

   1 //===-- Loader test to check if tls size is read correctly ----------------===//
   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 "include/errno.h"
  10 #include "include/sys/mman.h"
  11
  12 #undef NDEBUG
  13 #include "src/assert/assert.h"
  14
  15 #include "src/errno/llvmlibc_errno.h"
  16 #include "src/sys/mman/mmap.h"
  17
  18 constexpr int threadLocalDataSize = 101;
  19 _Thread_local int a[threadLocalDataSize] = {123};
  20
  21 int main(int argc, char **argv, char **envp) {
  22   assert(a[0] == 123);
  23
  24   for (int i = 1; i < threadLocalDataSize; ++i)
  25     a[i] = i;
  26   for (int i = 1; i < threadLocalDataSize; ++i)
  27     assert(a[i] == i);
  28
  29   // Call mmap with bad params so that an error value is
  30   // set in errno. Since errno is implemented using a thread
  31   // local var, this helps us test setting of errno and
  32   // reading it back.
  33   assert(llvmlibc_errno == 0);
  34   void *addr = __llvm_libc::mmap(nullptr, 0, PROT_READ,
  35                                  MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
  36   assert(addr == MAP_FAILED);
  37   assert(llvmlibc_errno == EINVAL);
  38
  39   return 0;
  40 }