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/* Distributed Checksum Clearinghouse heap debugging
*
* Copyright (c) 2005 by Rhyolite Software
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND RHYOLITE SOFTWARE DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL RHYOLITE SOFTWARE
* BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*
* Rhyolite Software DCC 1.2.74-1.13 $Revision$
*/
#include "dcc_defs.h"
#include "dcc_heap_debug.h"
#include <stdio.h>
void dcc_malloc_lock(void);
void dcc_malloc_unlock(void);
#ifdef UNIX
#include <unistd.h>
#if defined(FreeBSD) || defined(linux)
#define NO_MALLOC_OPTIONS
#endif
char dcc_malloc_options[] = "A";
#else /* !UNIX */
#include "malloc.h"
#endif /* !UNIX */
typedef u_long SENTINEL;
#define HEAD_SENTINEL_VALUE 0xdeadbeaf
#define TAIL_SENTINEL_VALUE 0xbeafdead
typedef struct mdbg{
SENTINEL head;
struct mdbg *fwd, *bak;
SENTINEL *tail;
} MDBG;
u_int dcc_num_mdbg; /* global to suppress warnings */
MDBG *dcc_mdbg_chain; /* when not used */
MDBG *bad_mp;
int bad_i;
/* leave a few names outside to make some `ar`s happy */
#ifdef DEBUG_HEAP
/* this needs to do as little as possible to avoid calling malloc()
* global and no NRATTRIB to avoid confusion in dumps */
void
dcc_heap_abort(const char *m)
{
#ifdef UNIX
write(STDERR_FILENO, m, strlen(m));
abort();
#else
bad_message_box("heap_debug", 1, m);
#endif
}
char *
dcc_strdup(const char *s)
{
char *p;
p = dcc_malloc(strlen(s)+1);
strcpy(p, s);
return p;
}
void
dcc_malloc_check(void)
{
MDBG *mp;
u_int i;
i = dcc_num_mdbg;
if (!i)
return;
mp = dcc_mdbg_chain;
for (;;) {
if (mp->head != HEAD_SENTINEL_VALUE
|| *mp->tail != TAIL_SENTINEL_VALUE)
dcc_heap_abort("trashed heap sentinel");
if (mp->bak->fwd != mp
|| mp->fwd->bak != mp) {
bad_mp = mp;
bad_i = i;
dcc_heap_abort("malloc chain trashed");
}
if (--i == 0) {
if (mp->fwd != dcc_mdbg_chain) {
bad_mp = mp;
bad_i = i;
dcc_heap_abort("wrong malloc chain too long");
}
#ifndef UNIX
i = _heapchk();
if (i != _HEAPOK && i != _HEAPEMPTY)
dcc_heap_abort("heapchk() failed");
#endif
return;
} else if (mp->fwd == dcc_mdbg_chain) {
bad_mp = mp;
bad_i = i;
dcc_heap_abort("wrong malloc chain too short");
}
mp = mp->fwd;
}
}
void *
dcc_malloc(size_t len)
{
MDBG *mp;
#if defined(UNIX) && !defined(NO_MALLOC_OPTIONS)
if (!malloc_options) {
malloc_options = dcc_malloc_options;
} else if (malloc_options != dcc_malloc_options) {
dcc_heap_abort("malloc_options already set");
}
#endif
dcc_malloc_lock();
dcc_malloc_check();
if (!len)
dcc_heap_abort("malloc(0)");
len += sizeof(MDBG) + sizeof(mp->tail);
len += (sizeof(mp->tail) - len) & (sizeof(mp->tail)-1); /* align tail */
mp = malloc(len);
if (!mp)
return mp;
if (!dcc_num_mdbg) {
mp->fwd = mp->bak = mp;
} else {
mp->bak = dcc_mdbg_chain;
mp->fwd = dcc_mdbg_chain->fwd;
mp->bak->fwd = mp;
mp->fwd->bak = mp;
}
dcc_mdbg_chain = mp;
mp->head = HEAD_SENTINEL_VALUE;
mp->tail = (SENTINEL *)((u_char *)mp+len-sizeof(mp->tail));
*mp->tail = TAIL_SENTINEL_VALUE;
dcc_num_mdbg++;
dcc_malloc_unlock();
return (mp+1);
}
void *
dcc_calloc(size_t n, size_t s)
{
void *p;
s *= n;
if (s == 0)
dcc_heap_abort("zero calloc() size");
p = dcc_malloc(s);
if (!p)
return p;
memset(p, 0, s);
return p;
}
void
dcc_free(void *p)
{
int i;
MDBG *mp;
dcc_malloc_lock();
dcc_malloc_check();
i = dcc_num_mdbg;
mp = dcc_mdbg_chain;
for (;;) {
if (!i)
dcc_heap_abort("freeing non-free");
if (mp+1 == p)
break;
mp = mp->fwd;
i--;
}
if (dcc_mdbg_chain == mp)
dcc_mdbg_chain = mp->fwd;
mp->bak->fwd = mp->fwd;
mp->fwd->bak = mp->bak;
dcc_num_mdbg--;
memset(mp, 0xf1, (u_char *)mp->tail+sizeof(mp->tail)-(u_char *)mp);
dcc_malloc_check();
dcc_malloc_unlock();
free(mp);
}
#endif /* DEBUG_HEAP */
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