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