1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 * 22 */ 23 24 #include <config.h> 25 #include "dbus-memory.h" 26 #include "dbus-internals.h" 27 #include "dbus-sysdeps.h" 28 #include "dbus-list.h" 29 #include <stdlib.h> 30 31 /** 32 * @defgroup DBusMemory Memory Allocation 33 * @ingroup DBus 34 * @brief dbus_malloc(), dbus_free(), etc. 35 * 36 * Functions and macros related to allocating and releasing 37 * blocks of memory. 38 * 39 */ 40 41 /** 42 * @defgroup DBusMemoryInternals Memory allocation implementation details 43 * @ingroup DBusInternals 44 * @brief internals of dbus_malloc() etc. 45 * 46 * Implementation details related to allocating and releasing blocks 47 * of memory. 48 */ 49 50 /** 51 * @addtogroup DBusMemory 52 * 53 * @{ 54 */ 55 56 /** 57 * @def dbus_new 58 * 59 * Safe macro for using dbus_malloc(). Accepts the type 60 * to allocate and the number of type instances to 61 * allocate as arguments, and returns a memory block 62 * cast to the desired type, instead of as a void*. 63 * 64 * @param type type name to allocate 65 * @param count number of instances in the allocated array 66 * @returns the new memory block or #NULL on failure 67 */ 68 69 /** 70 * @def dbus_new0 71 * 72 * Safe macro for using dbus_malloc0(). Accepts the type 73 * to allocate and the number of type instances to 74 * allocate as arguments, and returns a memory block 75 * cast to the desired type, instead of as a void*. 76 * The allocated array is initialized to all-bits-zero. 77 * 78 * @param type type name to allocate 79 * @param count number of instances in the allocated array 80 * @returns the new memory block or #NULL on failure 81 */ 82 83 /** 84 * @typedef DBusFreeFunction 85 * 86 * The type of a function which frees a block of memory. 87 * 88 * @param memory the memory to free 89 */ 90 91 /** @} */ /* end of public API docs */ 92 93 /** 94 * @addtogroup DBusMemoryInternals 95 * 96 * @{ 97 */ 98 99 #ifdef DBUS_BUILD_TESTS 100 static dbus_bool_t debug_initialized = FALSE; 101 static int fail_nth = -1; 102 static size_t fail_size = 0; 103 static int fail_alloc_counter = _DBUS_INT_MAX; 104 static int n_failures_per_failure = 1; 105 static int n_failures_this_failure = 0; 106 static dbus_bool_t guards = FALSE; 107 static dbus_bool_t disable_mem_pools = FALSE; 108 static dbus_bool_t backtrace_on_fail_alloc = FALSE; 109 static DBusAtomic n_blocks_outstanding = {0}; 110 111 /** value stored in guard padding for debugging buffer overrun */ 112 #define GUARD_VALUE 0xdeadbeef 113 /** size of the information about the block stored in guard mode */ 114 #define GUARD_INFO_SIZE 8 115 /** size of the GUARD_VALUE-filled padding after the header info */ 116 #define GUARD_START_PAD 16 117 /** size of the GUARD_VALUE-filled padding at the end of the block */ 118 #define GUARD_END_PAD 16 119 /** size of stuff at start of block */ 120 #define GUARD_START_OFFSET (GUARD_START_PAD + GUARD_INFO_SIZE) 121 /** total extra size over the requested allocation for guard stuff */ 122 #define GUARD_EXTRA_SIZE (GUARD_START_OFFSET + GUARD_END_PAD) 123 124 static void 125 _dbus_initialize_malloc_debug (void) 126 { 127 if (!debug_initialized) 128 { 129 debug_initialized = TRUE; 130 131 if (_dbus_getenv ("DBUS_MALLOC_FAIL_NTH") != NULL) 132 { 133 fail_nth = atoi (_dbus_getenv ("DBUS_MALLOC_FAIL_NTH")); 134 fail_alloc_counter = fail_nth; 135 _dbus_verbose ("Will fail malloc every %d times\n", fail_nth); 136 } 137 138 if (_dbus_getenv ("DBUS_MALLOC_FAIL_GREATER_THAN") != NULL) 139 { 140 fail_size = atoi (_dbus_getenv ("DBUS_MALLOC_FAIL_GREATER_THAN")); 141 _dbus_verbose ("Will fail mallocs over %ld bytes\n", 142 (long) fail_size); 143 } 144 145 if (_dbus_getenv ("DBUS_MALLOC_GUARDS") != NULL) 146 { 147 guards = TRUE; 148 _dbus_verbose ("Will use malloc guards\n"); 149 } 150 151 if (_dbus_getenv ("DBUS_DISABLE_MEM_POOLS") != NULL) 152 { 153 disable_mem_pools = TRUE; 154 _dbus_verbose ("Will disable memory pools\n"); 155 } 156 157 if (_dbus_getenv ("DBUS_MALLOC_BACKTRACES") != NULL) 158 { 159 backtrace_on_fail_alloc = TRUE; 160 _dbus_verbose ("Will backtrace on failing a malloc\n"); 161 } 162 } 163 } 164 165 /** 166 * Whether to turn off mem pools, useful for leak checking. 167 * 168 * @returns #TRUE if mempools should not be used. 169 */ 170 dbus_bool_t 171 _dbus_disable_mem_pools (void) 172 { 173 _dbus_initialize_malloc_debug (); 174 return disable_mem_pools; 175 } 176 177 /** 178 * Sets the number of allocations until we simulate a failed 179 * allocation. If set to 0, the next allocation to run 180 * fails; if set to 1, one succeeds then the next fails; etc. 181 * Set to _DBUS_INT_MAX to not fail anything. 182 * 183 * @param until_next_fail number of successful allocs before one fails 184 */ 185 void 186 _dbus_set_fail_alloc_counter (int until_next_fail) 187 { 188 _dbus_initialize_malloc_debug (); 189 190 fail_alloc_counter = until_next_fail; 191 192 #if 0 193 _dbus_verbose ("Set fail alloc counter = %d\n", fail_alloc_counter); 194 #endif 195 } 196 197 /** 198 * Gets the number of successful allocs until we'll simulate 199 * a failed alloc. 200 * 201 * @returns current counter value 202 */ 203 int 204 _dbus_get_fail_alloc_counter (void) 205 { 206 _dbus_initialize_malloc_debug (); 207 208 return fail_alloc_counter; 209 } 210 211 /** 212 * Sets how many mallocs to fail when the fail alloc counter reaches 213 * 0. 214 * 215 * @param failures_per_failure number to fail 216 */ 217 void 218 _dbus_set_fail_alloc_failures (int failures_per_failure) 219 { 220 n_failures_per_failure = failures_per_failure; 221 } 222 223 /** 224 * Gets the number of failures we'll have when the fail malloc 225 * counter reaches 0. 226 * 227 * @returns number of failures planned 228 */ 229 int 230 _dbus_get_fail_alloc_failures (void) 231 { 232 return n_failures_per_failure; 233 } 234 235 #ifdef DBUS_BUILD_TESTS 236 static dbus_bool_t called = 0; 237 /** 238 * Called when about to alloc some memory; if 239 * it returns #TRUE, then the allocation should 240 * fail. If it returns #FALSE, then the allocation 241 * should not fail. 242 * 243 * @returns #TRUE if this alloc should fail 244 */ 245 dbus_bool_t 246 _dbus_decrement_fail_alloc_counter (void) 247 { 248 _dbus_initialize_malloc_debug (); 249 #ifdef DBUS_WIN_FIXME 250 { 251 if (!called) 252 { 253 _dbus_verbose("TODO: memory allocation testing errors disabled for now\n"); 254 called = 1; 255 } 256 return FALSE; 257 } 258 #endif 259 260 if (fail_alloc_counter <= 0) 261 { 262 if (backtrace_on_fail_alloc) 263 _dbus_print_backtrace (); 264 265 _dbus_verbose ("failure %d\n", n_failures_this_failure); 266 267 n_failures_this_failure += 1; 268 if (n_failures_this_failure >= n_failures_per_failure) 269 { 270 if (fail_nth >= 0) 271 fail_alloc_counter = fail_nth; 272 else 273 fail_alloc_counter = _DBUS_INT_MAX; 274 275 n_failures_this_failure = 0; 276 277 _dbus_verbose ("reset fail alloc counter to %d\n", fail_alloc_counter); 278 } 279 280 return TRUE; 281 } 282 else 283 { 284 fail_alloc_counter -= 1; 285 return FALSE; 286 } 287 } 288 #endif /* DBUS_BUILD_TESTS */ 289 290 /** 291 * Get the number of outstanding malloc()'d blocks. 292 * 293 * @returns number of blocks 294 */ 295 int 296 _dbus_get_malloc_blocks_outstanding (void) 297 { 298 return n_blocks_outstanding.value; 299 } 300 301 /** 302 * Where the block came from. 303 */ 304 typedef enum 305 { 306 SOURCE_UNKNOWN, 307 SOURCE_MALLOC, 308 SOURCE_REALLOC, 309 SOURCE_MALLOC_ZERO, 310 SOURCE_REALLOC_NULL 311 } BlockSource; 312 313 static const char* 314 source_string (BlockSource source) 315 { 316 switch (source) 317 { 318 case SOURCE_UNKNOWN: 319 return "unknown"; 320 case SOURCE_MALLOC: 321 return "malloc"; 322 case SOURCE_REALLOC: 323 return "realloc"; 324 case SOURCE_MALLOC_ZERO: 325 return "malloc0"; 326 case SOURCE_REALLOC_NULL: 327 return "realloc(NULL)"; 328 } 329 _dbus_assert_not_reached ("Invalid malloc block source ID"); 330 return "invalid!"; 331 } 332 333 static void 334 check_guards (void *free_block, 335 dbus_bool_t overwrite) 336 { 337 if (free_block != NULL) 338 { 339 unsigned char *block = ((unsigned char*)free_block) - GUARD_START_OFFSET; 340 size_t requested_bytes = *(dbus_uint32_t*)block; 341 BlockSource source = *(dbus_uint32_t*)(block + 4); 342 unsigned int i; 343 dbus_bool_t failed; 344 345 failed = FALSE; 346 347 #if 0 348 _dbus_verbose ("Checking %d bytes request from source %s\n", 349 requested_bytes, source_string (source)); 350 #endif 351 352 i = GUARD_INFO_SIZE; 353 while (i < GUARD_START_OFFSET) 354 { 355 dbus_uint32_t value = *(dbus_uint32_t*) &block[i]; 356 if (value != GUARD_VALUE) 357 { 358 _dbus_warn ("Block of %lu bytes from %s had start guard value 0x%ux at %d expected 0x%x\n", 359 (long) requested_bytes, source_string (source), 360 value, i, GUARD_VALUE); 361 failed = TRUE; 362 } 363 364 i += 4; 365 } 366 367 i = GUARD_START_OFFSET + requested_bytes; 368 while (i < (GUARD_START_OFFSET + requested_bytes + GUARD_END_PAD)) 369 { 370 dbus_uint32_t value = *(dbus_uint32_t*) &block[i]; 371 if (value != GUARD_VALUE) 372 { 373 _dbus_warn ("Block of %lu bytes from %s had end guard value 0x%ux at %d expected 0x%x\n", 374 (long) requested_bytes, source_string (source), 375 value, i, GUARD_VALUE); 376 failed = TRUE; 377 } 378 379 i += 4; 380 } 381 382 /* set memory to anything but nul bytes */ 383 if (overwrite) 384 memset (free_block, 'g', requested_bytes); 385 386 if (failed) 387 _dbus_assert_not_reached ("guard value corruption"); 388 } 389 } 390 391 static void* 392 set_guards (void *real_block, 393 size_t requested_bytes, 394 BlockSource source) 395 { 396 unsigned char *block = real_block; 397 unsigned int i; 398 399 if (block == NULL) 400 return NULL; 401 402 _dbus_assert (GUARD_START_OFFSET + GUARD_END_PAD == GUARD_EXTRA_SIZE); 403 404 *((dbus_uint32_t*)block) = requested_bytes; 405 *((dbus_uint32_t*)(block + 4)) = source; 406 407 i = GUARD_INFO_SIZE; 408 while (i < GUARD_START_OFFSET) 409 { 410 (*(dbus_uint32_t*) &block[i]) = GUARD_VALUE; 411 412 i += 4; 413 } 414 415 i = GUARD_START_OFFSET + requested_bytes; 416 while (i < (GUARD_START_OFFSET + requested_bytes + GUARD_END_PAD)) 417 { 418 (*(dbus_uint32_t*) &block[i]) = GUARD_VALUE; 419 420 i += 4; 421 } 422 423 check_guards (block + GUARD_START_OFFSET, FALSE); 424 425 return block + GUARD_START_OFFSET; 426 } 427 428 #endif 429 430 /** @} */ /* End of internals docs */ 431 432 433 /** 434 * @addtogroup DBusMemory 435 * 436 * @{ 437 */ 438 439 /** 440 * Allocates the given number of bytes, as with standard 441 * malloc(). Guaranteed to return #NULL if bytes is zero 442 * on all platforms. Returns #NULL if the allocation fails. 443 * The memory must be released with dbus_free(). 444 * 445 * dbus_malloc() memory is NOT safe to free with regular free() from 446 * the C library. Free it with dbus_free() only. 447 * 448 * @param bytes number of bytes to allocate 449 * @return allocated memory, or #NULL if the allocation fails. 450 */ 451 void* 452 dbus_malloc (size_t bytes) 453 { 454 #ifdef DBUS_BUILD_TESTS 455 _dbus_initialize_malloc_debug (); 456 457 if (_dbus_decrement_fail_alloc_counter ()) 458 { 459 _dbus_verbose (" FAILING malloc of %ld bytes\n", (long) bytes); 460 return NULL; 461 } 462 #endif 463 464 if (bytes == 0) /* some system mallocs handle this, some don't */ 465 return NULL; 466 #ifdef DBUS_BUILD_TESTS 467 else if (fail_size != 0 && bytes > fail_size) 468 return NULL; 469 else if (guards) 470 { 471 void *block; 472 473 block = malloc (bytes + GUARD_EXTRA_SIZE); 474 if (block) 475 _dbus_atomic_inc (&n_blocks_outstanding); 476 477 return set_guards (block, bytes, SOURCE_MALLOC); 478 } 479 #endif 480 else 481 { 482 void *mem; 483 mem = malloc (bytes); 484 #ifdef DBUS_BUILD_TESTS 485 if (mem) 486 _dbus_atomic_inc (&n_blocks_outstanding); 487 #endif 488 return mem; 489 } 490 } 491 492 /** 493 * Allocates the given number of bytes, as with standard malloc(), but 494 * all bytes are initialized to zero as with calloc(). Guaranteed to 495 * return #NULL if bytes is zero on all platforms. Returns #NULL if the 496 * allocation fails. The memory must be released with dbus_free(). 497 * 498 * dbus_malloc0() memory is NOT safe to free with regular free() from 499 * the C library. Free it with dbus_free() only. 500 * 501 * @param bytes number of bytes to allocate 502 * @return allocated memory, or #NULL if the allocation fails. 503 */ 504 void* 505 dbus_malloc0 (size_t bytes) 506 { 507 #ifdef DBUS_BUILD_TESTS 508 _dbus_initialize_malloc_debug (); 509 510 if (_dbus_decrement_fail_alloc_counter ()) 511 { 512 _dbus_verbose (" FAILING malloc0 of %ld bytes\n", (long) bytes); 513 514 return NULL; 515 } 516 #endif 517 518 if (bytes == 0) 519 return NULL; 520 #ifdef DBUS_BUILD_TESTS 521 else if (fail_size != 0 && bytes > fail_size) 522 return NULL; 523 else if (guards) 524 { 525 void *block; 526 527 block = calloc (bytes + GUARD_EXTRA_SIZE, 1); 528 if (block) 529 _dbus_atomic_inc (&n_blocks_outstanding); 530 return set_guards (block, bytes, SOURCE_MALLOC_ZERO); 531 } 532 #endif 533 else 534 { 535 void *mem; 536 mem = calloc (bytes, 1); 537 #ifdef DBUS_BUILD_TESTS 538 if (mem) 539 _dbus_atomic_inc (&n_blocks_outstanding); 540 #endif 541 return mem; 542 } 543 } 544 545 /** 546 * Resizes a block of memory previously allocated by dbus_malloc() or 547 * dbus_malloc0(). Guaranteed to free the memory and return #NULL if bytes 548 * is zero on all platforms. Returns #NULL if the resize fails. 549 * If the resize fails, the memory is not freed. 550 * 551 * @param memory block to be resized 552 * @param bytes new size of the memory block 553 * @return allocated memory, or #NULL if the resize fails. 554 */ 555 void* 556 dbus_realloc (void *memory, 557 size_t bytes) 558 { 559 #ifdef DBUS_BUILD_TESTS 560 _dbus_initialize_malloc_debug (); 561 562 if (_dbus_decrement_fail_alloc_counter ()) 563 { 564 _dbus_verbose (" FAILING realloc of %ld bytes\n", (long) bytes); 565 566 return NULL; 567 } 568 #endif 569 570 if (bytes == 0) /* guarantee this is safe */ 571 { 572 dbus_free (memory); 573 return NULL; 574 } 575 #ifdef DBUS_BUILD_TESTS 576 else if (fail_size != 0 && bytes > fail_size) 577 return NULL; 578 else if (guards) 579 { 580 if (memory) 581 { 582 size_t old_bytes; 583 void *block; 584 585 check_guards (memory, FALSE); 586 587 block = realloc (((unsigned char*)memory) - GUARD_START_OFFSET, 588 bytes + GUARD_EXTRA_SIZE); 589 590 old_bytes = *(dbus_uint32_t*)block; 591 if (block && bytes >= old_bytes) 592 /* old guards shouldn't have moved */ 593 check_guards (((unsigned char*)block) + GUARD_START_OFFSET, FALSE); 594 595 return set_guards (block, bytes, SOURCE_REALLOC); 596 } 597 else 598 { 599 void *block; 600 601 block = malloc (bytes + GUARD_EXTRA_SIZE); 602 603 if (block) 604 _dbus_atomic_inc (&n_blocks_outstanding); 605 606 return set_guards (block, bytes, SOURCE_REALLOC_NULL); 607 } 608 } 609 #endif 610 else 611 { 612 void *mem; 613 mem = realloc (memory, bytes); 614 #ifdef DBUS_BUILD_TESTS 615 if (memory == NULL && mem != NULL) 616 _dbus_atomic_inc (&n_blocks_outstanding); 617 #endif 618 return mem; 619 } 620 } 621 622 /** 623 * Frees a block of memory previously allocated by dbus_malloc() or 624 * dbus_malloc0(). If passed #NULL, does nothing. 625 * 626 * @param memory block to be freed 627 */ 628 void 629 dbus_free (void *memory) 630 { 631 #ifdef DBUS_BUILD_TESTS 632 if (guards) 633 { 634 check_guards (memory, TRUE); 635 if (memory) 636 { 637 _dbus_atomic_dec (&n_blocks_outstanding); 638 639 _dbus_assert (n_blocks_outstanding.value >= 0); 640 641 free (((unsigned char*)memory) - GUARD_START_OFFSET); 642 } 643 644 return; 645 } 646 #endif 647 648 if (memory) /* we guarantee it's safe to free (NULL) */ 649 { 650 #ifdef DBUS_BUILD_TESTS 651 _dbus_atomic_dec (&n_blocks_outstanding); 652 653 _dbus_assert (n_blocks_outstanding.value >= 0); 654 #endif 655 656 free (memory); 657 } 658 } 659 660 /** 661 * Frees a #NULL-terminated array of strings. 662 * If passed #NULL, does nothing. 663 * 664 * @param str_array the array to be freed 665 */ 666 void 667 dbus_free_string_array (char **str_array) 668 { 669 if (str_array) 670 { 671 int i; 672 673 i = 0; 674 while (str_array[i]) 675 { 676 dbus_free (str_array[i]); 677 i++; 678 } 679 680 dbus_free (str_array); 681 } 682 } 683 684 /** @} */ /* End of public API docs block */ 685 686 687 /** 688 * @addtogroup DBusMemoryInternals 689 * 690 * @{ 691 */ 692 693 /** 694 * _dbus_current_generation is used to track each 695 * time that dbus_shutdown() is called, so we can 696 * reinit things after it's been called. It is simply 697 * incremented each time we shut down. 698 */ 699 int _dbus_current_generation = 1; 700 701 /** 702 * Represents a function to be called on shutdown. 703 */ 704 typedef struct ShutdownClosure ShutdownClosure; 705 706 /** 707 * This struct represents a function to be called on shutdown. 708 */ 709 struct ShutdownClosure 710 { 711 ShutdownClosure *next; /**< Next ShutdownClosure */ 712 DBusShutdownFunction func; /**< Function to call */ 713 void *data; /**< Data for function */ 714 }; 715 716 _DBUS_DEFINE_GLOBAL_LOCK (shutdown_funcs); 717 static ShutdownClosure *registered_globals = NULL; 718 719 /** 720 * Register a cleanup function to be called exactly once 721 * the next time dbus_shutdown() is called. 722 * 723 * @param func the function 724 * @param data data to pass to the function 725 * @returns #FALSE on not enough memory 726 */ 727 dbus_bool_t 728 _dbus_register_shutdown_func (DBusShutdownFunction func, 729 void *data) 730 { 731 ShutdownClosure *c; 732 733 c = dbus_new (ShutdownClosure, 1); 734 735 if (c == NULL) 736 return FALSE; 737 738 c->func = func; 739 c->data = data; 740 741 _DBUS_LOCK (shutdown_funcs); 742 743 c->next = registered_globals; 744 registered_globals = c; 745 746 _DBUS_UNLOCK (shutdown_funcs); 747 748 return TRUE; 749 } 750 751 /** @} */ /* End of private API docs block */ 752 753 754 /** 755 * @addtogroup DBusMemory 756 * 757 * @{ 758 */ 759 760 /** 761 * Frees all memory allocated internally by libdbus and 762 * reverses the effects of dbus_threads_init(). libdbus keeps internal 763 * global variables, for example caches and thread locks, and it 764 * can be useful to free these internal data structures. 765 * 766 * dbus_shutdown() does NOT free memory that was returned 767 * to the application. It only returns libdbus-internal 768 * data structures. 769 * 770 * You MUST free all memory and release all reference counts 771 * returned to you by libdbus prior to calling dbus_shutdown(). 772 * 773 * You can't continue to use any D-Bus objects, such as connections, 774 * that were allocated prior to dbus_shutdown(). You can, however, 775 * start over; call dbus_threads_init() again, create new connections, 776 * and so forth. 777 * 778 * WARNING: dbus_shutdown() is NOT thread safe, it must be called 779 * while NO other threads are using D-Bus. (Remember, you have to free 780 * all D-Bus objects and memory before you call dbus_shutdown(), so no 781 * thread can be using libdbus.) 782 * 783 * The purpose of dbus_shutdown() is to allow applications to get 784 * clean output from memory leak checkers. dbus_shutdown() may also be 785 * useful if you want to dlopen() libdbus instead of linking to it, 786 * and want to be able to unload the library again. 787 * 788 * There is absolutely no requirement to call dbus_shutdown() - in fact, 789 * most applications won't bother and should not feel guilty. 790 * 791 * You have to know that nobody is using libdbus in your application's 792 * process before you can call dbus_shutdown(). One implication of this 793 * is that calling dbus_shutdown() from a library is almost certainly 794 * wrong, since you don't know what the rest of the app is up to. 795 * 796 */ 797 void 798 dbus_shutdown (void) 799 { 800 while (registered_globals != NULL) 801 { 802 ShutdownClosure *c; 803 804 c = registered_globals; 805 registered_globals = c->next; 806 807 (* c->func) (c->data); 808 809 dbus_free (c); 810 } 811 812 _dbus_current_generation += 1; 813 } 814 815 /** @} */ /** End of public API docs block */ 816 817 #ifdef DBUS_BUILD_TESTS 818 #include "dbus-test.h" 819 820 /** 821 * @ingroup DBusMemoryInternals 822 * Unit test for DBusMemory 823 * @returns #TRUE on success. 824 */ 825 dbus_bool_t 826 _dbus_memory_test (void) 827 { 828 dbus_bool_t old_guards; 829 void *p; 830 size_t size; 831 832 old_guards = guards; 833 guards = TRUE; 834 p = dbus_malloc (4); 835 if (p == NULL) 836 _dbus_assert_not_reached ("no memory"); 837 for (size = 4; size < 256; size += 4) 838 { 839 p = dbus_realloc (p, size); 840 if (p == NULL) 841 _dbus_assert_not_reached ("no memory"); 842 } 843 for (size = 256; size != 0; size -= 4) 844 { 845 p = dbus_realloc (p, size); 846 if (p == NULL) 847 _dbus_assert_not_reached ("no memory"); 848 } 849 dbus_free (p); 850 guards = old_guards; 851 return TRUE; 852 } 853 854 #endif 855
