malloc/tst-mallocstate.c

   1 /* Copyright (C) 2001 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <stdio.h>
  22 #include "malloc.h"
  23
  24 static int errors = 0;
  25
  26 static void
  27 merror (const char *msg)
  28 {
  29   ++errors;
  30   printf ("Error: %s\n", msg);
  31 }
  32
  33 int
  34 main (void)
  35 {
  36   void *p1, *p2;
  37   void *save_state;
  38   long i;
  39
  40   errno = 0;
  41
  42   p1 = malloc (10);
  43   if (p1 == NULL)
  44     merror ("malloc (10) failed.");
  45
  46   p2 = malloc (20);
  47   if (p2 == NULL)
  48     merror ("malloc (20) failed.");
  49
  50   free (malloc (10));
  51
  52   for (i=0; i<100; ++i)
  53     {
  54       save_state = malloc_get_state ();
  55       if (save_state == NULL)
  56         {
  57           merror ("malloc_get_state () failed.");
  58           break;
  59         }
  60       /*free (malloc (10)); This could change the top chunk! */
  61       malloc_set_state (save_state);
  62       p1 = realloc (p1, i*4 + 4);
  63       if (p1 == NULL)
  64         merror ("realloc (i*4) failed.");
  65       free (save_state);
  66     }
  67
  68   p1 = realloc (p1, 40);
  69   free (p2);
  70   p2 = malloc (10);
  71   if (p2 == NULL)
  72     merror ("malloc (10) failed.");
  73   free (p1);
  74
  75   return errors != 0;
  76 }
  77
  78 /*
  79  * Local variables:
  80  * c-basic-offset: 2
  81  * End:
  82  */