elf/tst-getauxval-static.c

   1 /* Test getauxval from a dynamic library after static dlopen.
   2    Copyright (C) 2021-2022 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 <errno.h>
  21 #include <stdio.h>
  22 #include <support/check.h>
  23 #include <support/xdlfcn.h>
  24 #include <sys/auxv.h>
  25
  26 unsigned long getauxval_wrapper (unsigned long type, int *errnop);
  27
  28 static int
  29 do_test (void)
  30 {
  31   unsigned long outer_random = getauxval (AT_RANDOM);
  32   if (outer_random == 0)
  33     FAIL_UNSUPPORTED ("getauxval does not support AT_RANDOM");
  34
  35   unsigned long missing_auxv_type;
  36   for (missing_auxv_type = AT_RANDOM + 1; ; ++missing_auxv_type)
  37     {
  38       errno = 0;
  39       if (getauxval (missing_auxv_type) == 0 && errno != 0)
  40         {
  41           TEST_COMPARE (errno, ENOENT);
  42           break;
  43         }
  44     }
  45   printf ("info: first missing type: %lu\n", missing_auxv_type);
  46
  47   void *handle = xdlopen ("tst-auxvalmod.so", RTLD_LAZY);
  48   void *ptr = xdlsym (handle, "getauxval_wrapper");
  49
  50   __typeof__ (getauxval_wrapper) *wrapper = ptr;
  51   int inner_errno = 0;
  52   unsigned long inner_random = wrapper (AT_RANDOM, &inner_errno);
  53   TEST_COMPARE (outer_random, inner_random);
  54
  55   inner_errno = 0;
  56   TEST_COMPARE (wrapper (missing_auxv_type, &inner_errno), 0);
  57   TEST_COMPARE (inner_errno, ENOENT);
  58
  59   TEST_COMPARE (getauxval (AT_HWCAP), wrapper (AT_HWCAP, &inner_errno));
  60   TEST_COMPARE (getauxval (AT_HWCAP2), wrapper (AT_HWCAP2, &inner_errno));
  61
  62   xdlclose (handle);
  63   return 0;
  64 }
  65
  66 #include <support/test-driver.c>