1  /* Test size of the static TLS surplus reservation for backwards compatibility.
       2     Copyright (C) 2020-2023 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  
      23  static 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  
      32  static
      33  int 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, "_rtld_global_ro");
      38    printf ("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  }