elf/tst-next-ver.c

   1 /* Test RTLD_DEFAULT/RTLD_NEXT when the definition has multiple versions.
   2    Copyright (C) 2018-2023 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 <dlfcn.h>
  20 #include <stdio.h>
  21
  22 #include "testobj.h"
  23
  24 static int
  25 do_test (void)
  26 {
  27   /* Resolve to foo@@v3 in nextmod3.so, instead of
  28      foo@v1 or foo@v2.  */
  29   int (*fp) (int) = dlsym (RTLD_DEFAULT, "foo");
  30   int res = fp (0);
  31   printf ("preload (0) = %d, %s\n", res, res == 3 ? "ok" : "wrong");
  32   if (res != 3)
  33     return 1;
  34
  35   /* Resolve to foo@@v3 in nextmod3.so, instead of
  36      foo@v1 or foo@v2.  */
  37   fp = dlsym (RTLD_NEXT, "foo");
  38   res = fp (0);
  39   printf ("preload (0) = %d, %s\n", res, res == 3 ? "ok" : "wrong");
  40   if (res != 3)
  41     return 1;
  42
  43   return 0;
  44 }
  45
  46 #include <support/test-driver.c>