sysdeps/unix/sysv/linux/tst-getauxval.c

   1 /* Basic test for getauxval.
   2    Copyright (C) 2022-2024 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 <unistd.h>
  20 #include <stdio.h>
  21 #include <support/check.h>
  22 #include <sys/auxv.h>
  23
  24 static int missing;
  25 static int mismatch;
  26
  27 static void
  28 check_nonzero (unsigned long t, const char *s)
  29 {
  30   unsigned long v = getauxval (t);
  31   printf ("%s: %lu (0x%lx)\n", s, v, v);
  32   if (v == 0)
  33     missing++;
  34 }
  35
  36 static void
  37 check_eq (unsigned long t, const char *s, unsigned long want)
  38 {
  39   unsigned long v = getauxval (t);
  40   printf ("%s: %lu want: %lu\n", s, v, want);
  41   if (v != want)
  42     mismatch++;
  43 }
  44
  45 #define NZ(x) check_nonzero (x, #x)
  46 #define EQ(x, want) check_eq (x, #x, want)
  47
  48 static int
  49 do_test (void)
  50 {
  51   /* These auxv entries should be non-zero on Linux.  */
  52   NZ (AT_PHDR);
  53   NZ (AT_PHENT);
  54   NZ (AT_PHNUM);
  55   NZ (AT_PAGESZ);
  56   NZ (AT_ENTRY);
  57   NZ (AT_CLKTCK);
  58   NZ (AT_RANDOM);
  59   NZ (AT_EXECFN);
  60   if (missing)
  61     FAIL_EXIT1 ("Found %d missing auxv entries.\n", missing);
  62
  63   /* Check against syscalls.  */
  64   EQ (AT_UID, getuid ());
  65   EQ (AT_EUID, geteuid ());
  66   EQ (AT_GID, getgid ());
  67   EQ (AT_EGID, getegid ());
  68   if (mismatch)
  69     FAIL_EXIT1 ("Found %d mismatching auxv entries.\n", mismatch);
  70
  71   return 0;
  72 }
  73
  74 #include <support/test-driver.c>