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

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source code of libc/test/integration/startup/linux/tls_test.cpp