dlfcn/tststatic3.c

   1 /* Global-scope DSO mapping test with a static executable (BZ #15022).
   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
  23 #define MAGIC0 0
  24 #define MAGIC1 0x5500ffaa
  25 #define MAGIC2 0xaaff0055
  26
  27 /* Mapping a DSO into the global scope used to crash in static
  28    executables.  Check that it succeeds and then that symbols from
  29    the DSO can be accessed and operate as expected.  */
  30 static int
  31 do_test (void)
  32 {
  33   unsigned int (*getfoo) (void);
  34   void (*setfoo) (unsigned int);
  35   unsigned int *foop;
  36   unsigned int foo;
  37   void *handle;
  38
  39   /* Try to map a module into the global scope.  */
  40   handle = dlopen ("modstatic3.so", RTLD_LAZY | RTLD_GLOBAL);
  41   if (handle == NULL)
  42     {
  43       printf ("dlopen (modstatic3.so): %s\n", dlerror ());
  44       return 1;
  45     }
  46
  47   /* Get at its symbols.  */
  48   foop = dlsym (handle, "foo");
  49   if (foop == NULL)
  50     {
  51       printf ("dlsym (foo): %s\n", dlerror ());
  52       return 1;
  53     }
  54
  55   getfoo = dlsym (handle, "getfoo");
  56   if (getfoo == NULL)
  57     {
  58       printf ("dlsym (getfoo): %s\n", dlerror ());
  59       return 1;
  60     }
  61
  62   setfoo = dlsym (handle, "setfoo");
  63   if (setfoo == NULL)
  64     {
  65       printf ("dlsym (setfoo): %s\n", dlerror ());
  66       return 1;
  67     }
  68
  69   /* Make sure the view of the initial state is consistent.  */
  70   foo = *foop;
  71   if (foo != MAGIC0)
  72     {
  73       printf ("*foop: got %#x, expected %#x\n", foo, MAGIC0);
  74       return 1;
  75     }
  76
  77   foo = getfoo ();
  78   if (foo != MAGIC0)
  79     {
  80       printf ("getfoo: got %#x, expected %#x\n", foo, MAGIC0);
  81       return 1;
  82     }
  83
  84   /* Likewise with one change to its state.  */
  85   setfoo (MAGIC1);
  86
  87   foo = *foop;
  88   if (foo != MAGIC1)
  89     {
  90       printf ("*foop: got %#x, expected %#x\n", foo, MAGIC1);
  91       return 1;
  92     }
  93
  94   foo = getfoo ();
  95   if (foo != MAGIC1)
  96     {
  97       printf ("getfoo: got %#x, expected %#x\n", foo, MAGIC1);
  98       return 1;
  99     }
 100
 101   /* And with another.  */
 102   setfoo (MAGIC2);
 103
 104   foo = *foop;
 105   if (foo != MAGIC2)
 106     {
 107       printf ("*foop: got %#x, expected %#x\n", foo, MAGIC2);
 108       return 1;
 109     }
 110
 111   foo = getfoo ();
 112   if (foo != MAGIC2)
 113     {
 114       printf ("getfoo: got %#x, expected %#x\n", foo, MAGIC2);
 115       return 1;
 116     }
 117
 118   /* All done, clean up.  */
 119   getfoo = NULL;
 120   setfoo = NULL;
 121   foop = NULL;
 122   dlclose (handle);
 123
 124   return 0;
 125 }
 126
 127 #define TEST_FUNCTION do_test ()
 128 #include "../test-skeleton.c"