dlfcn/tststatic5.c

   1 /* GLRO(dl_pagesize) initialization DSO test with a static executable.
   2    Copyright (C) 2013-2021 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 <dlfcn.h>
  20 #include <stddef.h>
  21 #include <stdio.h>
  22 #include <unistd.h>
  23
  24 /* Check that the same page size is reported both directly and by a DSO
  25    mapped from a static executable.
  26
  27    On targets that support different page sizes, the kernel communicates
  28    the size currently in use via the auxiliary vector.  The auxiliary
  29    vector and HWCAP/HWCAP2 bits are copied across the static dlopen
  30    boundary in __rtld_static_init.  */
  31 static int
  32 do_test (void)
  33 {
  34   int pagesize = getpagesize ();
  35   int (*my_getpagesize) (void);
  36   int my_pagesize;
  37   void *handle;
  38
  39   /* Try to map a module.  */
  40   handle = dlopen ("modstatic5.so", RTLD_LAZY | RTLD_LOCAL);
  41   if (handle == NULL)
  42     {
  43       printf ("dlopen (modstatic5.so): %s\n", dlerror ());
  44       return 1;
  45     }
  46
  47   /* Get at its symbol.  */
  48   my_getpagesize = dlsym (handle, "my_getpagesize");
  49   if (my_getpagesize == NULL)
  50     {
  51       printf ("dlsym (my_getpagesize): %s\n", dlerror ());
  52       return 1;
  53     }
  54
  55   /* Make sure the page size reported is the same either way.  */
  56   my_pagesize = my_getpagesize ();
  57   if (my_pagesize != pagesize)
  58     {
  59       printf ("my_getpagesize: got %i, expected %i\n", my_pagesize, pagesize);
  60       return 1;
  61     }
  62
  63   /* All done, clean up.  */
  64   my_getpagesize = NULL;
  65   dlclose (handle);
  66
  67   return 0;
  68 }
  69
  70 #define TEST_FUNCTION do_test ()
  71 #include "../test-skeleton.c"