1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-memory.c D-Bus memory handling
3 *
4 * Copyright (C) 2002, 2003 Red Hat Inc.
5 *
6 * Licensed under the Academic Free License version 2.1
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24 #include "dbus-memory.h"
25 #include "dbus-internals.h"
26 #include "dbus-sysdeps.h"
27 #include "dbus-list.h"
28 #include <stdlib.h>
29
30 /**
31 * @defgroup DBusMemory Memory Allocation
32 * @ingroup DBus
33 * @brief dbus_malloc(), dbus_free(), etc.
34 *
35 * Functions and macros related to allocating and releasing
36 * blocks of memory.
37 *
38 */
39
40 /**
41 * @defgroup DBusMemoryInternals Memory allocation implementation details
42 * @ingroup DBusInternals
43 * @brief internals of dbus_malloc() etc.
44 *
45 * Implementation details related to allocating and releasing blocks
46 * of memory.
47 */
48
49 /**
50 * @addtogroup DBusMemory
51 *
52 * @{
53 */
54
55 /**
56 * @def dbus_new
57 *
58 * Safe macro for using dbus_malloc(). Accepts the type
59 * to allocate and the number of type instances to
60 * allocate as arguments, and returns a memory block
61 * cast to the desired type, instead of as a void*.
62 *
63 * @param type type name to allocate
64 * @param count number of instances in the allocated array
65 * @returns the new memory block or #NULL on failure
66 */
67
68 /**
69 * @def dbus_new0
70 *
71 * Safe macro for using dbus_malloc0(). Accepts the type
72 * to allocate and the number of type instances to
73 * allocate as arguments, and returns a memory block
74 * cast to the desired type, instead of as a void*.
75 * The allocated array is initialized to all-bits-zero.
76 *
77 * @param type type name to allocate
78 * @param count number of instances in the allocated array
79 * @returns the new memory block or #NULL on failure
80 */
81
82 /**
83 * @typedef DBusFreeFunction
84 *
85 * The type of a function which frees a block of memory.
86 *
87 * @param memory the memory to free
88 */
89
90 /** @} */ /* end of public API docs */
91
92 /**
93 * @addtogroup DBusMemoryInternals
94 *
95 * @{
96 */
97
98 #ifdef DBUS_BUILD_TESTS
99 static dbus_bool_t debug_initialized = FALSE;
100 static int fail_nth = -1;
101 static size_t fail_size = 0;
102 static int fail_alloc_counter = _DBUS_INT_MAX;
103 static int n_failures_per_failure = 1;
104 static int n_failures_this_failure = 0;
105 static dbus_bool_t guards = FALSE;
106 static dbus_bool_t disable_mem_pools = FALSE;
107 static dbus_bool_t backtrace_on_fail_alloc = FALSE;
108 static DBusAtomic n_blocks_outstanding = {0};
109
110 /** value stored in guard padding for debugging buffer overrun */
111 #define GUARD_VALUE 0xdeadbeef
112 /** size of the information about the block stored in guard mode */
113 #define GUARD_INFO_SIZE 8
114 /** size of the GUARD_VALUE-filled padding after the header info */
115 #define GUARD_START_PAD 16
116 /** size of the GUARD_VALUE-filled padding at the end of the block */
117 #define GUARD_END_PAD 16
118 /** size of stuff at start of block */
119 #define GUARD_START_OFFSET (GUARD_START_PAD + GUARD_INFO_SIZE)
120 /** total extra size over the requested allocation for guard stuff */
121 #define GUARD_EXTRA_SIZE (GUARD_START_OFFSET + GUARD_END_PAD)
122
123 static void
_dbus_initialize_malloc_debug(void)124 _dbus_initialize_malloc_debug (void)
125 {
126 if (!debug_initialized)
127 {
128 debug_initialized = TRUE;
129
130 if (_dbus_getenv ("DBUS_MALLOC_FAIL_NTH") != NULL)
131 {
132 fail_nth = atoi (_dbus_getenv ("DBUS_MALLOC_FAIL_NTH"));
133 fail_alloc_counter = fail_nth;
134 _dbus_verbose ("Will fail malloc every %d times\n", fail_nth);
135 }
136
137 if (_dbus_getenv ("DBUS_MALLOC_FAIL_GREATER_THAN") != NULL)
138 {
139 fail_size = atoi (_dbus_getenv ("DBUS_MALLOC_FAIL_GREATER_THAN"));
140 _dbus_verbose ("Will fail mallocs over %ld bytes\n",
141 (long) fail_size);
142 }
143
144 if (_dbus_getenv ("DBUS_MALLOC_GUARDS") != NULL)
145 {
146 guards = TRUE;
147 _dbus_verbose ("Will use malloc guards\n");
148 }
149
150 if (_dbus_getenv ("DBUS_DISABLE_MEM_POOLS") != NULL)
151 {
152 disable_mem_pools = TRUE;
153 _dbus_verbose ("Will disable memory pools\n");
154 }
155
156 if (_dbus_getenv ("DBUS_MALLOC_BACKTRACES") != NULL)
157 {
158 backtrace_on_fail_alloc = TRUE;
159 _dbus_verbose ("Will backtrace on failing a malloc\n");
160 }
161 }
162 }
163
164 /**
165 * Whether to turn off mem pools, useful for leak checking.
166 *
167 * @returns #TRUE if mempools should not be used.
168 */
169 dbus_bool_t
_dbus_disable_mem_pools(void)170 _dbus_disable_mem_pools (void)
171 {
172 _dbus_initialize_malloc_debug ();
173 return disable_mem_pools;
174 }
175
176 /**
177 * Sets the number of allocations until we simulate a failed
178 * allocation. If set to 0, the next allocation to run
179 * fails; if set to 1, one succeeds then the next fails; etc.
180 * Set to _DBUS_INT_MAX to not fail anything.
181 *
182 * @param until_next_fail number of successful allocs before one fails
183 */
184 void
_dbus_set_fail_alloc_counter(int until_next_fail)185 _dbus_set_fail_alloc_counter (int until_next_fail)
186 {
187 _dbus_initialize_malloc_debug ();
188
189 fail_alloc_counter = until_next_fail;
190
191 #if 0
192 _dbus_verbose ("Set fail alloc counter = %d\n", fail_alloc_counter);
193 #endif
194 }
195
196 /**
197 * Gets the number of successful allocs until we'll simulate
198 * a failed alloc.
199 *
200 * @returns current counter value
201 */
202 int
_dbus_get_fail_alloc_counter(void)203 _dbus_get_fail_alloc_counter (void)
204 {
205 _dbus_initialize_malloc_debug ();
206
207 return fail_alloc_counter;
208 }
209
210 /**
211 * Sets how many mallocs to fail when the fail alloc counter reaches
212 * 0.
213 *
214 * @param failures_per_failure number to fail
215 */
216 void
_dbus_set_fail_alloc_failures(int failures_per_failure)217 _dbus_set_fail_alloc_failures (int failures_per_failure)
218 {
219 n_failures_per_failure = failures_per_failure;
220 }
221
222 /**
223 * Gets the number of failures we'll have when the fail malloc
224 * counter reaches 0.
225 *
226 * @returns number of failures planned
227 */
228 int
_dbus_get_fail_alloc_failures(void)229 _dbus_get_fail_alloc_failures (void)
230 {
231 return n_failures_per_failure;
232 }
233
234 #ifdef DBUS_BUILD_TESTS
235 /**
236 * Called when about to alloc some memory; if
237 * it returns #TRUE, then the allocation should
238 * fail. If it returns #FALSE, then the allocation
239 * should not fail.
240 *
241 * @returns #TRUE if this alloc should fail
242 */
243 dbus_bool_t
_dbus_decrement_fail_alloc_counter(void)244 _dbus_decrement_fail_alloc_counter (void)
245 {
246 _dbus_initialize_malloc_debug ();
247
248 if (fail_alloc_counter <= 0)
249 {
250 if (backtrace_on_fail_alloc)
251 _dbus_print_backtrace ();
252
253 _dbus_verbose ("failure %d\n", n_failures_this_failure);
254
255 n_failures_this_failure += 1;
256 if (n_failures_this_failure >= n_failures_per_failure)
257 {
258 if (fail_nth >= 0)
259 fail_alloc_counter = fail_nth;
260 else
261 fail_alloc_counter = _DBUS_INT_MAX;
262
263 n_failures_this_failure = 0;
264
265 _dbus_verbose ("reset fail alloc counter to %d\n", fail_alloc_counter);
266 }
267
268 return TRUE;
269 }
270 else
271 {
272 fail_alloc_counter -= 1;
273 return FALSE;
274 }
275 }
276 #endif /* DBUS_BUILD_TESTS */
277
278 /**
279 * Get the number of outstanding malloc()'d blocks.
280 *
281 * @returns number of blocks
282 */
283 int
_dbus_get_malloc_blocks_outstanding(void)284 _dbus_get_malloc_blocks_outstanding (void)
285 {
286 return n_blocks_outstanding.value;
287 }
288
289 /**
290 * Where the block came from.
291 */
292 typedef enum
293 {
294 SOURCE_UNKNOWN,
295 SOURCE_MALLOC,
296 SOURCE_REALLOC,
297 SOURCE_MALLOC_ZERO,
298 SOURCE_REALLOC_NULL
299 } BlockSource;
300
301 static const char*
source_string(BlockSource source)302 source_string (BlockSource source)
303 {
304 switch (source)
305 {
306 case SOURCE_UNKNOWN:
307 return "unknown";
308 case SOURCE_MALLOC:
309 return "malloc";
310 case SOURCE_REALLOC:
311 return "realloc";
312 case SOURCE_MALLOC_ZERO:
313 return "malloc0";
314 case SOURCE_REALLOC_NULL:
315 return "realloc(NULL)";
316 }
317 _dbus_assert_not_reached ("Invalid malloc block source ID");
318 return "invalid!";
319 }
320
321 static void
check_guards(void * free_block,dbus_bool_t overwrite)322 check_guards (void *free_block,
323 dbus_bool_t overwrite)
324 {
325 if (free_block != NULL)
326 {
327 unsigned char *block = ((unsigned char*)free_block) - GUARD_START_OFFSET;
328 size_t requested_bytes = *(dbus_uint32_t*)block;
329 BlockSource source = *(dbus_uint32_t*)(block + 4);
330 unsigned int i;
331 dbus_bool_t failed;
332
333 failed = FALSE;
334
335 #if 0
336 _dbus_verbose ("Checking %d bytes request from source %s\n",
337 requested_bytes, source_string (source));
338 #endif
339
340 i = GUARD_INFO_SIZE;
341 while (i < GUARD_START_OFFSET)
342 {
343 dbus_uint32_t value = *(dbus_uint32_t*) &block[i];
344 if (value != GUARD_VALUE)
345 {
346 _dbus_warn ("Block of %lu bytes from %s had start guard value 0x%ux at %d expected 0x%x\n",
347 (long) requested_bytes, source_string (source),
348 value, i, GUARD_VALUE);
349 failed = TRUE;
350 }
351
352 i += 4;
353 }
354
355 i = GUARD_START_OFFSET + requested_bytes;
356 while (i < (GUARD_START_OFFSET + requested_bytes + GUARD_END_PAD))
357 {
358 dbus_uint32_t value = *(dbus_uint32_t*) &block[i];
359 if (value != GUARD_VALUE)
360 {
361 _dbus_warn ("Block of %lu bytes from %s had end guard value 0x%ux at %d expected 0x%x\n",
362 (long) requested_bytes, source_string (source),
363 value, i, GUARD_VALUE);
364 failed = TRUE;
365 }
366
367 i += 4;
368 }
369
370 /* set memory to anything but nul bytes */
371 if (overwrite)
372 memset (free_block, 'g', requested_bytes);
373
374 if (failed)
375 _dbus_assert_not_reached ("guard value corruption");
376 }
377 }
378
379 static void*
set_guards(void * real_block,size_t requested_bytes,BlockSource source)380 set_guards (void *real_block,
381 size_t requested_bytes,
382 BlockSource source)
383 {
384 unsigned char *block = real_block;
385 unsigned int i;
386
387 if (block == NULL)
388 return NULL;
389
390 _dbus_assert (GUARD_START_OFFSET + GUARD_END_PAD == GUARD_EXTRA_SIZE);
391
392 *((dbus_uint32_t*)block) = requested_bytes;
393 *((dbus_uint32_t*)(block + 4)) = source;
394
395 i = GUARD_INFO_SIZE;
396 while (i < GUARD_START_OFFSET)
397 {
398 (*(dbus_uint32_t*) &block[i]) = GUARD_VALUE;
399
400 i += 4;
401 }
402
403 i = GUARD_START_OFFSET + requested_bytes;
404 while (i < (GUARD_START_OFFSET + requested_bytes + GUARD_END_PAD))
405 {
406 (*(dbus_uint32_t*) &block[i]) = GUARD_VALUE;
407
408 i += 4;
409 }
410
411 check_guards (block + GUARD_START_OFFSET, FALSE);
412
413 return block + GUARD_START_OFFSET;
414 }
415
416 #endif
417
418 /** @} */ /* End of internals docs */
419
420
421 /**
422 * @addtogroup DBusMemory
423 *
424 * @{
425 */
426
427 /**
428 * Allocates the given number of bytes, as with standard
429 * malloc(). Guaranteed to return #NULL if bytes is zero
430 * on all platforms. Returns #NULL if the allocation fails.
431 * The memory must be released with dbus_free().
432 *
433 * dbus_malloc() memory is NOT safe to free with regular free() from
434 * the C library. Free it with dbus_free() only.
435 *
436 * @param bytes number of bytes to allocate
437 * @return allocated memory, or #NULL if the allocation fails.
438 */
439 void*
dbus_malloc(size_t bytes)440 dbus_malloc (size_t bytes)
441 {
442 #ifdef DBUS_BUILD_TESTS
443 _dbus_initialize_malloc_debug ();
444
445 if (_dbus_decrement_fail_alloc_counter ())
446 {
447 _dbus_verbose (" FAILING malloc of %ld bytes\n", (long) bytes);
448 return NULL;
449 }
450 #endif
451
452 if (bytes == 0) /* some system mallocs handle this, some don't */
453 return NULL;
454 #ifdef DBUS_BUILD_TESTS
455 else if (fail_size != 0 && bytes > fail_size)
456 return NULL;
457 else if (guards)
458 {
459 void *block;
460
461 block = malloc (bytes + GUARD_EXTRA_SIZE);
462 if (block)
463 _dbus_atomic_inc (&n_blocks_outstanding);
464
465 return set_guards (block, bytes, SOURCE_MALLOC);
466 }
467 #endif
468 else
469 {
470 void *mem;
471 mem = malloc (bytes);
472 #ifdef DBUS_BUILD_TESTS
473 if (mem)
474 _dbus_atomic_inc (&n_blocks_outstanding);
475 #endif
476 return mem;
477 }
478 }
479
480 /**
481 * Allocates the given number of bytes, as with standard malloc(), but
482 * all bytes are initialized to zero as with calloc(). Guaranteed to
483 * return #NULL if bytes is zero on all platforms. Returns #NULL if the
484 * allocation fails. The memory must be released with dbus_free().
485 *
486 * dbus_malloc0() memory is NOT safe to free with regular free() from
487 * the C library. Free it with dbus_free() only.
488 *
489 * @param bytes number of bytes to allocate
490 * @return allocated memory, or #NULL if the allocation fails.
491 */
492 void*
dbus_malloc0(size_t bytes)493 dbus_malloc0 (size_t bytes)
494 {
495 #ifdef DBUS_BUILD_TESTS
496 _dbus_initialize_malloc_debug ();
497
498 if (_dbus_decrement_fail_alloc_counter ())
499 {
500 _dbus_verbose (" FAILING malloc0 of %ld bytes\n", (long) bytes);
501
502 return NULL;
503 }
504 #endif
505
506 if (bytes == 0)
507 return NULL;
508 #ifdef DBUS_BUILD_TESTS
509 else if (fail_size != 0 && bytes > fail_size)
510 return NULL;
511 else if (guards)
512 {
513 void *block;
514
515 block = calloc (bytes + GUARD_EXTRA_SIZE, 1);
516 if (block)
517 _dbus_atomic_inc (&n_blocks_outstanding);
518 return set_guards (block, bytes, SOURCE_MALLOC_ZERO);
519 }
520 #endif
521 else
522 {
523 void *mem;
524 mem = calloc (bytes, 1);
525 #ifdef DBUS_BUILD_TESTS
526 if (mem)
527 _dbus_atomic_inc (&n_blocks_outstanding);
528 #endif
529 return mem;
530 }
531 }
532
533 /**
534 * Resizes a block of memory previously allocated by dbus_malloc() or
535 * dbus_malloc0(). Guaranteed to free the memory and return #NULL if bytes
536 * is zero on all platforms. Returns #NULL if the resize fails.
537 * If the resize fails, the memory is not freed.
538 *
539 * @param memory block to be resized
540 * @param bytes new size of the memory block
541 * @return allocated memory, or #NULL if the resize fails.
542 */
543 void*
dbus_realloc(void * memory,size_t bytes)544 dbus_realloc (void *memory,
545 size_t bytes)
546 {
547 #ifdef DBUS_BUILD_TESTS
548 _dbus_initialize_malloc_debug ();
549
550 if (_dbus_decrement_fail_alloc_counter ())
551 {
552 _dbus_verbose (" FAILING realloc of %ld bytes\n", (long) bytes);
553
554 return NULL;
555 }
556 #endif
557
558 if (bytes == 0) /* guarantee this is safe */
559 {
560 dbus_free (memory);
561 return NULL;
562 }
563 #ifdef DBUS_BUILD_TESTS
564 else if (fail_size != 0 && bytes > fail_size)
565 return NULL;
566 else if (guards)
567 {
568 if (memory)
569 {
570 size_t old_bytes;
571 void *block;
572
573 check_guards (memory, FALSE);
574
575 block = realloc (((unsigned char*)memory) - GUARD_START_OFFSET,
576 bytes + GUARD_EXTRA_SIZE);
577
578 old_bytes = *(dbus_uint32_t*)block;
579 if (block && bytes >= old_bytes)
580 /* old guards shouldn't have moved */
581 check_guards (((unsigned char*)block) + GUARD_START_OFFSET, FALSE);
582
583 return set_guards (block, bytes, SOURCE_REALLOC);
584 }
585 else
586 {
587 void *block;
588
589 block = malloc (bytes + GUARD_EXTRA_SIZE);
590
591 if (block)
592 _dbus_atomic_inc (&n_blocks_outstanding);
593
594 return set_guards (block, bytes, SOURCE_REALLOC_NULL);
595 }
596 }
597 #endif
598 else
599 {
600 void *mem;
601 mem = realloc (memory, bytes);
602 #ifdef DBUS_BUILD_TESTS
603 if (memory == NULL && mem != NULL)
604 _dbus_atomic_inc (&n_blocks_outstanding);
605 #endif
606 return mem;
607 }
608 }
609
610 /**
611 * Frees a block of memory previously allocated by dbus_malloc() or
612 * dbus_malloc0(). If passed #NULL, does nothing.
613 *
614 * @param memory block to be freed
615 */
616 void
dbus_free(void * memory)617 dbus_free (void *memory)
618 {
619 #ifdef DBUS_BUILD_TESTS
620 if (guards)
621 {
622 check_guards (memory, TRUE);
623 if (memory)
624 {
625 _dbus_atomic_dec (&n_blocks_outstanding);
626
627 _dbus_assert (n_blocks_outstanding.value >= 0);
628
629 free (((unsigned char*)memory) - GUARD_START_OFFSET);
630 }
631
632 return;
633 }
634 #endif
635
636 if (memory) /* we guarantee it's safe to free (NULL) */
637 {
638 #ifdef DBUS_BUILD_TESTS
639 _dbus_atomic_dec (&n_blocks_outstanding);
640
641 _dbus_assert (n_blocks_outstanding.value >= 0);
642 #endif
643
644 free (memory);
645 }
646 }
647
648 /**
649 * Frees a #NULL-terminated array of strings.
650 * If passed #NULL, does nothing.
651 *
652 * @param str_array the array to be freed
653 */
654 void
dbus_free_string_array(char ** str_array)655 dbus_free_string_array (char **str_array)
656 {
657 if (str_array)
658 {
659 int i;
660
661 i = 0;
662 while (str_array[i])
663 {
664 dbus_free (str_array[i]);
665 i++;
666 }
667
668 dbus_free (str_array);
669 }
670 }
671
672 /** @} */ /* End of public API docs block */
673
674
675 /**
676 * @addtogroup DBusMemoryInternals
677 *
678 * @{
679 */
680
681 /**
682 * _dbus_current_generation is used to track each
683 * time that dbus_shutdown() is called, so we can
684 * reinit things after it's been called. It is simply
685 * incremented each time we shut down.
686 */
687 int _dbus_current_generation = 1;
688
689 /**
690 * Represents a function to be called on shutdown.
691 */
692 typedef struct ShutdownClosure ShutdownClosure;
693
694 /**
695 * This struct represents a function to be called on shutdown.
696 */
697 struct ShutdownClosure
698 {
699 ShutdownClosure *next; /**< Next ShutdownClosure */
700 DBusShutdownFunction func; /**< Function to call */
701 void *data; /**< Data for function */
702 };
703
704 _DBUS_DEFINE_GLOBAL_LOCK (shutdown_funcs);
705 static ShutdownClosure *registered_globals = NULL;
706
707 /**
708 * Register a cleanup function to be called exactly once
709 * the next time dbus_shutdown() is called.
710 *
711 * @param func the function
712 * @param data data to pass to the function
713 * @returns #FALSE on not enough memory
714 */
715 dbus_bool_t
_dbus_register_shutdown_func(DBusShutdownFunction func,void * data)716 _dbus_register_shutdown_func (DBusShutdownFunction func,
717 void *data)
718 {
719 ShutdownClosure *c;
720
721 c = dbus_new (ShutdownClosure, 1);
722
723 if (c == NULL)
724 return FALSE;
725
726 c->func = func;
727 c->data = data;
728
729 _DBUS_LOCK (shutdown_funcs);
730
731 c->next = registered_globals;
732 registered_globals = c;
733
734 _DBUS_UNLOCK (shutdown_funcs);
735
736 return TRUE;
737 }
738
739 /** @} */ /* End of private API docs block */
740
741
742 /**
743 * @addtogroup DBusMemory
744 *
745 * @{
746 */
747
748 /**
749 * Frees all memory allocated internally by libdbus and
750 * reverses the effects of dbus_threads_init(). libdbus keeps internal
751 * global variables, for example caches and thread locks, and it
752 * can be useful to free these internal data structures.
753 *
754 * dbus_shutdown() does NOT free memory that was returned
755 * to the application. It only returns libdbus-internal
756 * data structures.
757 *
758 * You MUST free all memory and release all reference counts
759 * returned to you by libdbus prior to calling dbus_shutdown().
760 *
761 * You can't continue to use any D-Bus objects, such as connections,
762 * that were allocated prior to dbus_shutdown(). You can, however,
763 * start over; call dbus_threads_init() again, create new connections,
764 * and so forth.
765 *
766 * WARNING: dbus_shutdown() is NOT thread safe, it must be called
767 * while NO other threads are using D-Bus. (Remember, you have to free
768 * all D-Bus objects and memory before you call dbus_shutdown(), so no
769 * thread can be using libdbus.)
770 *
771 * The purpose of dbus_shutdown() is to allow applications to get
772 * clean output from memory leak checkers. dbus_shutdown() may also be
773 * useful if you want to dlopen() libdbus instead of linking to it,
774 * and want to be able to unload the library again.
775 *
776 * There is absolutely no requirement to call dbus_shutdown() - in fact,
777 * most applications won't bother and should not feel guilty.
778 *
779 * You have to know that nobody is using libdbus in your application's
780 * process before you can call dbus_shutdown(). One implication of this
781 * is that calling dbus_shutdown() from a library is almost certainly
782 * wrong, since you don't know what the rest of the app is up to.
783 *
784 */
785 void
dbus_shutdown(void)786 dbus_shutdown (void)
787 {
788 while (registered_globals != NULL)
789 {
790 ShutdownClosure *c;
791
792 c = registered_globals;
793 registered_globals = c->next;
794
795 (* c->func) (c->data);
796
797 dbus_free (c);
798 }
799
800 _dbus_current_generation += 1;
801 }
802
803 /** @} */ /** End of public API docs block */
804
805 #ifdef DBUS_BUILD_TESTS
806 #include "dbus-test.h"
807
808 /**
809 * @ingroup DBusMemoryInternals
810 * Unit test for DBusMemory
811 * @returns #TRUE on success.
812 */
813 dbus_bool_t
_dbus_memory_test(void)814 _dbus_memory_test (void)
815 {
816 dbus_bool_t old_guards;
817 void *p;
818 size_t size;
819
820 old_guards = guards;
821 guards = TRUE;
822 p = dbus_malloc (4);
823 if (p == NULL)
824 _dbus_assert_not_reached ("no memory");
825 for (size = 4; size < 256; size += 4)
826 {
827 p = dbus_realloc (p, size);
828 if (p == NULL)
829 _dbus_assert_not_reached ("no memory");
830 }
831 for (size = 256; size != 0; size -= 4)
832 {
833 p = dbus_realloc (p, size);
834 if (p == NULL)
835 _dbus_assert_not_reached ("no memory");
836 }
837 dbus_free (p);
838 guards = old_guards;
839 return TRUE;
840 }
841
842 #endif
843