tests/test-random_r.c

   1 /* Test random_r.
   2    Copyright (C) 2008-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 #include <stdlib.h>
  20
  21 #include "signature.h"
  22 SIGNATURE_CHECK (srandom_r, int, (unsigned int, struct random_data *));
  23 SIGNATURE_CHECK (initstate_r, int, (unsigned int, char *, size_t,
  24                                     struct random_data *));
  25 SIGNATURE_CHECK (setstate_r, int, (char *, struct random_data *));
  26 SIGNATURE_CHECK (random_r, int, (struct random_data *, int32_t *));
  27
  28 #include <time.h>
  29
  30 #include "macros.h"
  31
  32 /* Note: This test crashes on glibc/SPARC systems.
  33    Reported at <https://sourceware.org/bugzilla/show_bug.cgi?id=30584>.  */
  34
  35 static int
  36 test_failed (int alignment)
  37 {
  38   struct random_data rand_state;
  39   char buf[128 + sizeof (int32_t)];
  40   unsigned int i;
  41   unsigned int n_big = 0;
  42
  43   rand_state.state = NULL;
  44   if (initstate_r (time (NULL), buf + alignment, sizeof buf - alignment,
  45                    &rand_state))
  46     return 1;
  47   for (i = 0; i < 1000; i++)
  48     {
  49       int32_t r;
  50       ASSERT (random_r (&rand_state, &r) == 0);
  51       ASSERT (0 <= r);
  52       if (RAND_MAX / 2 < r)
  53         ++n_big;
  54     }
  55
  56   /* Fail if none of the numbers were larger than RAND_MAX / 2.  */
  57   return !n_big;
  58 }
  59
  60 int
  61 main ()
  62 {
  63   int alignment;
  64   for (alignment = 0; alignment < sizeof (int32_t); alignment++)
  65     if (test_failed (alignment))
  66       return 1;
  67   return test_exit_status;
  68 }