1/* Test size of the static TLS surplus reservation for backwards compatibility.
2 Copyright (C) 2020-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <stdio.h>
20#include <support/check.h>
21#include <support/xdlfcn.h>
22
23static int do_test (void);
24#include <support/test-driver.c>
25
26/* This hack results in a definition of struct rtld_global_ro. Do
27 this after all the other header inclusions, to minimize the
28 impact. */
29#define SHARED
30#include <ldsodefs.h>
31
32static
33int do_test (void)
34{
35 /* Avoid introducing a copy relocation due to the hidden alias in
36 ld.so. */
37 struct rtld_global_ro *glro = xdlsym (NULL, symbol: "_rtld_global_ro");
38 printf (format: "info: _dl_tls_static_surplus: %zu\n", glro->_dl_tls_static_surplus);
39 /* Hisoric value: 16 * 100 + 64. */
40 TEST_VERIFY (glro->_dl_tls_static_surplus >= 1664);
41 return 0;
42}
43

source code of glibc/elf/tst-tls-surplus.c