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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
|
/* cygheap.cc: Cygwin heap manager.
Copyright 2000 Cygnus Solutions.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <errno.h>
#include <fhandler.h>
#include <assert.h>
#include <stdlib.h>
#include "cygheap.h"
#include "heap.h"
#include "cygerrno.h"
#include "sync.h"
init_cygheap NO_COPY *cygheap;
void NO_COPY *cygheap_max = NULL;
static NO_COPY muto *cygheap_protect = NULL;
inline static void
init_cheap ()
{
cygheap = (init_cygheap *) VirtualAlloc (NULL, CYGHEAPSIZE, MEM_RESERVE, PAGE_NOACCESS);
if (!cygheap)
api_fatal ("Couldn't reserve space for cygwin's heap, %E");
cygheap_max = cygheap + 1;
}
#define pagetrunc(x) ((void *) (((DWORD) (x)) & ~(4096 - 1)))
static void *__stdcall
_csbrk (int sbs)
{
void *lastheap;
bool needalloc;
if (cygheap)
needalloc = 0;
else
{
init_cheap ();
needalloc = 1;
}
lastheap = cygheap_max;
(char *) cygheap_max += sbs;
void *heapalign = (void *) pagetrunc (lastheap);
if (!needalloc)
needalloc = sbs && ((heapalign == lastheap) || heapalign != pagetrunc (cygheap_max));
if (needalloc && !VirtualAlloc (lastheap, (DWORD) sbs ?: 1, MEM_COMMIT, PAGE_READWRITE))
api_fatal ("couldn't commit memory for cygwin heap, %E");
return lastheap;
}
extern "C" void __stdcall
cygheap_init ()
{
cygheap_protect = new_muto (FALSE, "cygheap_protect");
_csbrk (0);
}
/* Copyright (C) 1997, 2000 DJ Delorie */
#define NBUCKETS 32
char *buckets[NBUCKETS] = {0};
#define N0 ((_cmalloc_entry *) NULL)
#define to_cmalloc(s) ((_cmalloc_entry *) (((char *) (s)) - (int) (N0->data)))
static void *_cmalloc (int size) __attribute ((regparm(1)));
static void *__stdcall _crealloc (void *ptr, int size) __attribute ((regparm(2)));
static void *__stdcall
_cmalloc (int size)
{
_cmalloc_entry *rvc;
int b, sz;
/* Calculate "bit bucket" and size as a power of two. */
for (b = 3, sz = 8; sz && sz < (size + 4); b++, sz <<= 1)
continue;
cygheap_protect->acquire ();
if (buckets[b])
{
rvc = (_cmalloc_entry *) buckets[b];
buckets[b] = rvc->ptr;
rvc->b = b;
}
else
{
size = sz + sizeof (_cmalloc_entry);
rvc = (_cmalloc_entry *) _csbrk (size);
rvc->b = b;
rvc->prev = cygheap->chain;
cygheap->chain = rvc;
}
cygheap_protect->release ();
return rvc->data;
}
static void __stdcall
_cfree (void *ptr)
{
cygheap_protect->acquire ();
_cmalloc_entry *rvc = to_cmalloc (ptr);
DWORD b = rvc->b;
rvc->ptr = buckets[b];
buckets[b] = (char *) rvc;
cygheap_protect->release ();
}
static void *__stdcall
_crealloc (void *ptr, int size)
{
void *newptr;
if (ptr == NULL)
newptr = _cmalloc (size);
else
{
int oldsize = 1 << to_cmalloc (ptr)->b;
if (size <= oldsize)
return ptr;
newptr = _cmalloc (size);
memcpy (newptr, ptr, oldsize);
_cfree (ptr);
}
return newptr;
}
/* End Copyright (C) 1997 DJ Delorie */
#define sizeof_cygheap(n) ((n) + sizeof(cygheap_entry))
struct cygheap_entry
{
int type;
struct cygheap_entry *next;
char data[0];
};
#define N ((cygheap_entry *) NULL)
#define tocygheap(s) ((cygheap_entry *) (((char *) (s)) - (int) (N->data)))
/* Called by fork or spawn to reallocate cygwin heap */
extern "C" void __stdcall
cygheap_fixup_in_child (HANDLE parent, bool execed)
{
DWORD m, n;
n = (DWORD) cygheap_max - (DWORD) cygheap;
/* Reserve cygwin heap in same spot as parent */
if (!VirtualAlloc (cygheap, CYGHEAPSIZE, MEM_RESERVE, PAGE_NOACCESS))
api_fatal ("Couldn't reserve space for cygwin's heap (%p) in child, cygheap, %E", cygheap);
/* Allocate same amount of memory as parent */
if (!VirtualAlloc (cygheap, n, MEM_COMMIT, PAGE_READWRITE))
api_fatal ("Couldn't allocate space for child's heap %p, size %d, %E",
cygheap, n);
/* Copy memory from the parent */
m = 0;
if (!ReadProcessMemory (parent, cygheap, cygheap, n, &m) || m != n)
api_fatal ("Couldn't read parent's cygwin heap %d bytes != %d, %E",
n, m);
cygheap_init ();
if (execed)
{
/* Walk the allocated memory chain looking for orphaned memory from
previous execs */
for (_cmalloc_entry *rvc = cygheap->chain; rvc; rvc = rvc->prev)
{
cygheap_entry *ce = (cygheap_entry *) rvc->data;
if (rvc->b >= NBUCKETS || ce->type <= HEAP_1_START)
continue;
else if (ce->type < HEAP_1_MAX)
ce->type += HEAP_1_MAX; /* Mark for freeing after next exec */
else
_cfree (ce); /* Marked by parent for freeing in child */
}
}
}
inline static void *
creturn (cygheap_types x, cygheap_entry * c, int len)
{
if (!c)
{
__seterrno ();
return NULL;
}
c->type = x;
if (cygheap_max < ((char *) c + len))
cygheap_max = (char *) c + len;
MALLOC_CHECK;
return (void *) c->data;
}
extern "C" void *__stdcall
cmalloc (cygheap_types x, DWORD n)
{
cygheap_entry *c;
MALLOC_CHECK;
c = (cygheap_entry *) _cmalloc (sizeof_cygheap (n));
if (!c)
system_printf ("cmalloc returned NULL");
return creturn (x, c, n);
}
extern "C" void *__stdcall
crealloc (void *s, DWORD n)
{
MALLOC_CHECK;
if (s == NULL)
return cmalloc (HEAP_STR, n); // kludge
assert (!inheap (s));
cygheap_entry *c = tocygheap (s);
cygheap_types t = (cygheap_types) c->type;
c = (cygheap_entry *) _crealloc (c, sizeof_cygheap (n));
if (!c)
system_printf ("crealloc returned NULL");
return creturn (t, c, n);
}
extern "C" void __stdcall
cfree (void *s)
{
MALLOC_CHECK;
assert (!inheap (s));
(void) _cfree (tocygheap (s));
MALLOC_CHECK;
}
extern "C" void *__stdcall
ccalloc (cygheap_types x, DWORD n, DWORD size)
{
cygheap_entry *c;
MALLOC_CHECK;
c = (cygheap_entry *) _cmalloc (sizeof_cygheap (n * size));
if (c)
memset (c->data, 0, n * size);
if (!c)
system_printf ("ccalloc returned NULL");
return creturn (x, c, n);
}
extern "C" char *__stdcall
cstrdup (const char *s)
{
MALLOC_CHECK;
char *p = (char *) cmalloc (HEAP_STR, strlen (s) + 1);
if (!p)
return NULL;
strcpy (p, s);
MALLOC_CHECK;
return p;
}
extern "C" char *__stdcall
cstrdup1 (const char *s)
{
MALLOC_CHECK;
char *p = (char *) cmalloc (HEAP_1_STR, strlen (s) + 1);
if (!p)
return NULL;
strcpy (p, s);
MALLOC_CHECK;
return p;
}
cygheap_root::cygheap_root (cygheap_root &nroot)
{
rootlen = nroot.rootlen;
root = nroot.root ? cstrdup (nroot.root) : NULL;
}
cygheap_root::~cygheap_root ()
{
if (root)
cfree (root);
}
char *
cygheap_root::operator =(const char *new_root)
{
if (root)
{
cfree (root);
root = NULL;
}
rootlen = 0;
if (new_root && *new_root)
{
root = cstrdup (new_root);
rootlen = strlen (root);
if (rootlen > 1 && root[rootlen - 1] == '/')
root[--rootlen] = '\0';
if (!rootlen)
{
cfree (root);
root = NULL;
}
}
return root;
}
cygheap_user::~cygheap_user ()
{
if (pname)
cfree (pname);
if (plogsrv)
cfree (plogsrv);
if (pdomain)
cfree (pdomain);
if (psid)
cfree (psid);
}
void
cygheap_user::set_name (const char *new_name)
{
if (pname)
cfree (pname);
pname = cstrdup (new_name ? new_name : "");
}
void
cygheap_user::set_logsrv (const char *new_logsrv)
{
if (plogsrv)
cfree (plogsrv);
plogsrv = (new_logsrv && *new_logsrv) ? cstrdup (new_logsrv) : NULL;
}
void
cygheap_user::set_domain (const char *new_domain)
{
if (pdomain)
cfree (pdomain);
pdomain = (new_domain && *new_domain) ? cstrdup (new_domain) : NULL;
}
BOOL
cygheap_user::set_sid (PSID new_sid)
{
if (!new_sid)
{
if (psid)
cfree (psid);
psid = NULL;
return TRUE;
}
else
{
if (!psid)
psid = cmalloc (HEAP_STR, MAX_SID_LEN);
return CopySid (MAX_SID_LEN, psid, new_sid);
}
}
|