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) 2012-2024 Free Software Foundation, Inc.
   5    Copyright The GNU Toolchain Authors.
   6    This file is part of the GNU C Library.
   7
   8    The GNU C Library is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU Lesser General Public
  10    License as published by the Free Software Foundation; either
  11    version 2.1 of the License, or (at your option) any later version.
  12
  13    The GNU C Library is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    Lesser General Public License for more details.
  17
  18    You should have received a copy of the GNU Lesser General Public
  19    License along with the GNU C Library; if not, see
  20    <https://www.gnu.org/licenses/>.  */
  21
  22 #include <malloc.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25 #include <support/support.h>
  26 #include <support/check.h>
  27
  28 static int
  29 do_test (void)
  30 {
  31   size_t usable_size;
  32   void *p = malloc (7);
  33
  34   TEST_VERIFY_EXIT (p != NULL);
  35   usable_size = malloc_usable_size (p);
  36   TEST_COMPARE (usable_size, 7);
  37   memset (p, 0, usable_size);
  38   free (p);
  39
  40   TEST_COMPARE (malloc_usable_size (NULL), 0);
  41
  42   return 0;
  43 }
  44
  45 #include "support/test-driver.c"