elf/tst-dlsym-error.c

   1 /* Test error reporting for dlsym, dlvsym failures.
   2    Copyright (C) 2016-2021 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 <gnu/lib-names.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 /* Used to disambiguate symbol names.  */
  26 static int counter;
  27
  28 static void
  29 test_one (void *handle, const char *name, void *(func) (void *, const char *),
  30           const char *suffix)
  31 {
  32   ++counter;
  33   char symbol[32];
  34   snprintf (symbol, sizeof (symbol), "no_such_symbol_%d", counter);
  35   char *expected_message;
  36   if (asprintf (&expected_message, ": undefined symbol: %s%s",
  37                 symbol, suffix) < 0)
  38     {
  39       printf ("error: asprintf: %m\n");
  40       abort ();
  41     }
  42
  43   void *addr = func (handle, symbol);
  44   if (addr != NULL)
  45     {
  46       printf ("error: %s: found symbol \"no_such_symbol\"\n", name);
  47       abort ();
  48     }
  49   const char *message = dlerror ();
  50   if (message == NULL)
  51     {
  52       printf ("error: %s: missing error message\n", name);
  53       abort ();
  54     }
  55   const char *message_without_path = strchrnul (message, ':');
  56   if (strcmp (message_without_path, expected_message) != 0)
  57     {
  58       printf ("error: %s: unexpected error message: %s\n", name, message);
  59       abort ();
  60     }
  61   free (expected_message);
  62
  63   message = dlerror ();
  64   if (message != NULL)
  65     {
  66       printf ("error: %s: unexpected error message: %s\n", name, message);
  67       abort ();
  68     }
  69 }
  70
  71 static void
  72 test_handles (const char *name, void *(func) (void *, const char *),
  73               const char *suffix)
  74 {
  75   test_one (RTLD_DEFAULT, name, func, suffix);
  76   test_one (RTLD_NEXT, name, func, suffix);
  77
  78   void *handle = dlopen (LIBC_SO, RTLD_LAZY);
  79   if (handle == NULL)
  80     {
  81       printf ("error: cannot dlopen %s: %s\n", LIBC_SO, dlerror ());
  82       abort ();
  83     }
  84   test_one (handle, name, func, suffix);
  85   dlclose (handle);
  86 }
  87
  88 static void *
  89 dlvsym_no_such_version (void *handle, const char *name)
  90 {
  91   return dlvsym (handle, name, "NO_SUCH_VERSION");
  92 }
  93
  94 static void *
  95 dlvsym_glibc_private (void *handle, const char *name)
  96 {
  97   return dlvsym (handle, name, "GLIBC_PRIVATE");
  98 }
  99
 100 static int
 101 do_test (void)
 102 {
 103   test_handles ("dlsym", dlsym, "");
 104   test_handles ("dlvsym", dlvsym_no_such_version,
 105                 ", version NO_SUCH_VERSION");
 106   test_handles ("dlvsym", dlvsym_glibc_private,
 107                 ", version GLIBC_PRIVATE");
 108
 109   return 0;
 110 }
 111
 112
 113 #include <support/test-driver.c>