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/*
* Copyright (c) 1996, 1998 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the Flux OSKit. The OSKit is free software, also known
* as "open source;" you can redistribute it and/or modify it under the terms
* of the GNU General Public License (GPL), version 2, as published by the Free
* Software Foundation (FSF). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
/*
* This routine does a series of sanity checks on a pointer. Returns
* zero if no errors. no-zero if something is wrong. It also prints
* a bogosity message on an error.
*/
#include "memdebug.h"
/*
* Incase the (l)user doesn't #include<memdebug.h>, this will
* allow them to make calls without the macro, and from
* within other memdebug functions.
*/
int memdebug_ptrchk(void *ptr)
{
return memdebug_traced_ptrchk(ptr, 0, 0);
}
/*
* memdebug_traced_ptrchk()
*
* Runs lots of sanity checks on a pointer and its fence posts.
* Returns -1 if a bad error occured (ie, the data in the fence
* posts can't be trusted--esp, the "next" ptr.); 1 if there
* was a problem but its not necessarily fatal; or 0 if there
* were no problems.
*/
int memdebug_traced_ptrchk(void *ptr, char *file, int line)
{
memdebug_mhead *head;
memdebug_mtail *tail;
int magic_trashed;
int rc = 0;
int i;
DPRINTF("checking pointer 0x%p\n", ptr);
if (ptr == 0)
{
memdebug_info_dump("%s: ptr is NULL at", file, line);
return -1;
}
/* Find and check the memory block header. */
head = (memdebug_mhead*)ptr - 1;
if (head->magic == FREE_MAGIC)
{
memdebug_info_dump("MEMDEBUG BOGOSITY:"
" block has been free()'d. ",
file, line);
memdebug_bogosity(head);
rc = 1;
}
if (head->magic != HEAD_MAGIC)
{
memdebug_info_dump("MEMDEBUG BOGOSITY:"
" Bogus pointer (head magic wrong.)"
" at", file, line);
/* memdebug_bogosity(head); */
return -1;
}
magic_trashed = 0;
for (i = 0; i < MHEAD_DEADBEEF; i++)
{
if (head->deadbeef[i] != 0xdeadbeef)
magic_trashed++;
}
if(magic_trashed)
{
memdebug_printf("MEMDEBUG BOGOSITY:"
" Block underflow"
" (%d of %d buffer ints trashed)",
magic_trashed, MHEAD_DEADBEEF);
memdebug_info_dump(" at", file, line);
memdebug_bogosity(head);
rc = 1;
}
/* Find and check the memory block tailer. */
tail = (memdebug_mtail*)((void*)(head + 1) + head->size);
magic_trashed = 0;
for (i = 0; i < MTAIL_DEADBEEF; i++)
{
if (tail->deadbeef[i] != 0xdeadbeef)
magic_trashed++;
}
if (magic_trashed)
{
memdebug_printf("MEMDEBUG BOGOSITY:"
" Block overflow"
" (%d of %d buffer ints trashed.)",
magic_trashed, MTAIL_DEADBEEF);
memdebug_info_dump(" at", file, line);
memdebug_bogosity(head);
rc = 1;
}
if (tail->magic != TAIL_MAGIC)
{
memdebug_info_dump("MEMDEBUG BOGOSITY:"
" Trailer magic trashed."
" at", file, line);
memdebug_bogosity(head);
rc = 1;
}
if ((rc == 0) && (tail->size != head->size))
{
memdebug_printf("MEMDEBUG BOGOSITY:"
" Head and tail sizes don't match."
" at", file, line);
memdebug_bogosity(head);
rc = 1;
}
return rc;
}
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