malloc/tst-malloc-usable.c

   1 /* Ensure that malloc_usable_size returns the request size with
   2    MALLOC_CHECK_ exported to a positive value.
   3
   4    Copyright (C) 2012-2019 Free Software Foundation, Inc.
   5    This file is part of the GNU C Library.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <malloc.h>
  22 #include <string.h>
  23 #include <stdio.h>
  24
  25 static int
  26 do_test (void)
  27 {
  28   size_t usable_size;
  29   void *p = malloc (7);
  30   if (!p)
  31     {
  32       printf ("memory allocation failed\n");
  33       return 1;
  34     }
  35
  36   usable_size = malloc_usable_size (p);
  37   if (usable_size != 7)
  38     {
  39       printf ("malloc_usable_size: expected 7 but got %zu\n", usable_size);
  40       return 1;
  41     }
  42
  43   memset (p, 0, usable_size);
  44   free (p);
  45   return 0;
  46 }
  47
  48 #define TEST_FUNCTION do_test ()
  49 #include "../test-skeleton.c"