elf/tst-dlsym-error.c

   1 /* Test error reporting for dlsym, dlvsym failures.
   2    Copyright (C) 2016 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <dlfcn.h>
  20 #include <gnu/lib-names.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23
  24 /* Used to disambiguate symbol names.  */
  25 static int counter;
  26
  27 static void
  28 test_one (void *handle, const char *name, void *(func) (void *, const char *),
  29           const char *suffix)
  30 {
  31   ++counter;
  32   char symbol[32];
  33   snprintf (symbol, sizeof (symbol), "no_such_symbol_%d", counter);
  34   char *expected_message;
  35   if (asprintf (&expected_message, ": undefined symbol: %s%s",
  36                 symbol, suffix) < 0)
  37     {
  38       printf ("error: asprintf: %m\n");
  39       abort ();
  40     }
  41
  42   void *addr = func (handle, symbol);
  43   if (addr != NULL)
  44     {
  45       printf ("error: %s: found symbol \"no_such_symbol\"\n", name);
  46       abort ();
  47     }
  48   const char *message = dlerror ();
  49   if (message == NULL)
  50     {
  51       printf ("error: %s: missing error message\n", name);
  52       abort ();
  53     }
  54   const char *message_without_path = strchrnul (message, ':');
  55   if (strcmp (message_without_path, expected_message) != 0)
  56     {
  57       printf ("error: %s: unexpected error message: %s\n", name, message);
  58       abort ();
  59     }
  60   free (expected_message);
  61
  62   message = dlerror ();
  63   if (message != NULL)
  64     {
  65       printf ("error: %s: unexpected error message: %s\n", name, message);
  66       abort ();
  67     }
  68 }
  69
  70 static void
  71 test_handles (const char *name, void *(func) (void *, const char *),
  72               const char *suffix)
  73 {
  74   test_one (RTLD_DEFAULT, name, func, suffix);
  75   test_one (RTLD_NEXT, name, func, suffix);
  76
  77   void *handle = dlopen (LIBC_SO, RTLD_LAZY);
  78   if (handle == NULL)
  79     {
  80       printf ("error: cannot dlopen %s: %s\n", LIBC_SO, dlerror ());
  81       abort ();
  82     }
  83   test_one (handle, name, func, suffix);
  84   dlclose (handle);
  85 }
  86
  87 static void *
  88 dlvsym_no_such_version (void *handle, const char *name)
  89 {
  90   return dlvsym (handle, name, "NO_SUCH_VERSION");
  91 }
  92
  93 static void *
  94 dlvsym_glibc_private (void *handle, const char *name)
  95 {
  96   return dlvsym (handle, name, "GLIBC_PRIVATE");
  97 }
  98
  99 static int
 100 do_test (void)
 101 {
 102   test_handles ("dlsym", dlsym, "");
 103   test_handles ("dlvsym", dlvsym_no_such_version,
 104                 ", version NO_SUCH_VERSION");
 105   test_handles ("dlvsym", dlvsym_glibc_private,
 106                 ", version GLIBC_PRIVATE");
 107
 108   return 0;
 109 }
 110
 111
 112 #define TEST_FUNCTION do_test ()
 113 #include "../test-skeleton.c"