malloc/tst-mallocstate.c

   1 /* Copyright (C) 2001-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Wolfram Gloger <wg@malloc.de>, 2001.
   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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <stdio.h>
  21 #include "malloc.h"
  22
  23 static int errors = 0;
  24
  25 static void
  26 merror (const char *msg)
  27 {
  28   ++errors;
  29   printf ("Error: %s\n", msg);
  30 }
  31
  32 int
  33 main (void)
  34 {
  35   void *p1, *p2;
  36   void *save_state;
  37   long i;
  38
  39   errno = 0;
  40
  41   p1 = malloc (10);
  42   if (p1 == NULL)
  43     merror ("malloc (10) failed.");
  44
  45   p2 = malloc (20);
  46   if (p2 == NULL)
  47     merror ("malloc (20) failed.");
  48
  49   free (malloc (10));
  50
  51   for (i=0; i<100; ++i)
  52     {
  53       save_state = malloc_get_state ();
  54       if (save_state == NULL)
  55         {
  56           merror ("malloc_get_state () failed.");
  57           break;
  58         }
  59       /*free (malloc (10)); This could change the top chunk! */
  60       malloc_set_state (save_state);
  61       p1 = realloc (p1, i*4 + 4);
  62       if (p1 == NULL)
  63         merror ("realloc (i*4) failed.");
  64       free (save_state);
  65     }
  66
  67   p1 = realloc (p1, 40);
  68   free (p2);
  69   p2 = malloc (10);
  70   if (p2 == NULL)
  71     merror ("malloc (10) failed.");
  72   free (p1);
  73
  74   return errors != 0;
  75 }
  76
  77 /*
  78  * Local variables:
  79  * c-basic-offset: 2
  80  * End:
  81  */