1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/***
*heapchk.c - perform a consistency check on the heap
*
* Copyright (c) 1989-1991, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Defines the _heapchk() and _heapset() functions
*
*Revision History:
* 06-30-89 JCR Module created.
* 07-28-89 GJF Added check for free block preceding the rover
* 11-13-89 GJF Added MTHREAD support, also fixed copyright
* 12-13-89 GJF Added check for descriptor order, did some tuning,
* changed header file name to heap.h
* 12-15-89 GJF Purged DEBUG286 stuff. Also added explicit _cdecl to
* function definitions.
* 12-19-89 GJF Got rid of checks involving plastdesc (revised check
* of proverdesc and DEBUG errors accordingly)
* 03-09-90 GJF Replaced _cdecl with _CALLTYPE1, added #include
* <cruntime.h> and removed #include <register.h>.
* 03-29-90 GJF Made _heap_checkset() _CALLTYPE4.
* 09-27-90 GJF New-style function declarators.
* 03-05-91 GJF Changed strategy for rover - old version available
* by #define-ing _OLDROVER_.
* 06-27-94 SRW Ported to Win32 Heap API
* 07-06-94 SRW Chicago compatibility changes.
*
*******************************************************************************/
#include <cruntime.h>
#include <oscalls.h>
#include <malloc.h>
#include <os2dll.h>
#include <stddef.h>
#include <string.h>
#ifndef _POSIX_
/***
*int _heapchk() - Validate the heap
*int _heapset(_fill) - Validate the heap and fill in free entries
*
*Purpose:
* Performs a consistency check on the heap.
*
*Entry:
* For heapchk()
* No arguments
* For heapset()
* int _fill - value to be used as filler in free entries
*
*Exit:
* Returns one of the following values:
*
* _HEAPOK - completed okay
* _HEAPEMPTY - heap not initialized
* _HEAPBADBEGIN - can't find initial header info
* _HEAPBADNODE - malformed node somewhere
*
* Debug version prints out a diagnostic message if an error is found
* (see errmsg[] above).
*
* NOTE: Add code to support memory regions.
*
*Uses:
*
*Exceptions:
*
*******************************************************************************/
int _CALLTYPE1 _heapchk(void)
{
if (!HeapValidate( GetProcessHeap(), 0, NULL )) {
return _HEAPBADNODE;
}
else {
return _HEAPOK;
}
}
/******************************************************************************/
int _CALLTYPE1 _heapset (
unsigned int _fill
)
{
int _retval = _HEAPOK;
PROCESS_HEAP_ENTRY Entry;
if (!HeapValidate( GetProcessHeap(), 0, NULL )) {
return _HEAPBADNODE;
}
if (!HeapLock( GetProcessHeap() )) {
return _HEAPBADBEGIN;
}
Entry.lpData = NULL;
try {
while (TRUE) {
if (!HeapWalk( GetProcessHeap(), &Entry )) {
if (GetLastError() != ERROR_NO_MORE_ITEMS) {
_retval = _HEAPBADNODE;
}
break;
}
if (Entry.wFlags & (PROCESS_HEAP_REGION | PROCESS_HEAP_UNCOMMITTED_RANGE)) {
continue;
}
if (!(Entry.wFlags & PROCESS_HEAP_ENTRY_BUSY)) {
try {
memset( Entry.lpData, _fill, Entry.cbData );
}
except( EXCEPTION_EXECUTE_HANDLER ) {
// Chicago free blocks may contain uncommitted pages. Punt
}
}
}
}
finally {
HeapUnlock( GetProcessHeap() );
}
return _retval;
}
#endif /* !_POSIX_ */
|
