usr/src/lib/libmtmalloc/tests/dirtymem.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1998 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32 #include <sys/types.h>
  33 #include "mtmalloc.h"
  34
  35 /*
  36  * This file tests for reference after free
  37  *
  38  * cc -O -o dirtymem dirtymem.c -lmtmalloc -I../common
  39  */
  40
  41 struct a_struct {
  42         int a;
  43         char *b;
  44         double c;
  45 } struct_o_death;
  46
  47
  48 main(int argc, char ** argv)
  49 {
  50         struct a_struct *foo, *leak;
  51         int ncpus = sysconf(_SC_NPROCESSORS_CONF);
  52
  53         mallocctl(MTDEBUGPATTERN, 1);
  54         foo = (struct a_struct *)malloc(sizeof (struct_o_death));
  55
  56         free(foo);
  57         foo->a = 4;
  58
  59         /*
  60          * We have to make sure we allocate from the same pool
  61          * as the last time. Turn the rotor with malloc until
  62          * we get back to where we started.
  63          */
  64         while (ncpus-- > 1)
  65                 leak = malloc(sizeof (struct_o_death));
  66
  67         fprintf(stderr, "malloc struct again\n");
  68         fprintf(stderr, "we should dump core\n");
  69         foo = malloc(sizeof (struct_o_death));
  70
  71         exit(0);
  72 }