25 #include "dbus-memory.h"
26 #include "dbus-internals.h"
27 #include "dbus-sysdeps.h"
28 #include "dbus-list.h"
29 #include "dbus-threads.h"
100 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
102 static int fail_nth = -1;
103 static size_t fail_size = 0;
105 static int n_failures_per_failure = 1;
106 static int n_failures_this_failure = 0;
114 #define GUARD_VALUE 0xdeadbeef
116 #define GUARD_INFO_SIZE 8
118 #define GUARD_START_PAD 16
120 #define GUARD_END_PAD 16
122 #define GUARD_START_OFFSET (GUARD_START_PAD + GUARD_INFO_SIZE)
124 #define GUARD_EXTRA_SIZE (GUARD_START_OFFSET + GUARD_END_PAD)
127 _dbus_initialize_malloc_debug (
void)
129 if (!debug_initialized)
131 debug_initialized =
TRUE;
135 fail_nth = atoi (
_dbus_getenv (
"DBUS_MALLOC_FAIL_NTH"));
136 fail_alloc_counter = fail_nth;
137 _dbus_verbose (
"Will fail dbus_malloc every %d times\n", fail_nth);
142 fail_size = atoi (
_dbus_getenv (
"DBUS_MALLOC_FAIL_GREATER_THAN"));
143 _dbus_verbose (
"Will fail mallocs over %ld bytes\n",
150 _dbus_verbose (
"Will use dbus_malloc guards\n");
155 disable_mem_pools =
TRUE;
156 _dbus_verbose (
"Will disable memory pools\n");
161 backtrace_on_fail_alloc =
TRUE;
162 _dbus_verbose (
"Will backtrace on failing a dbus_malloc\n");
167 malloc_cannot_fail =
TRUE;
168 _dbus_verbose (
"Will abort if system malloc() and friends fail\n");
179 _dbus_disable_mem_pools (
void)
181 _dbus_initialize_malloc_debug ();
182 return disable_mem_pools;
194 _dbus_set_fail_alloc_counter (
int until_next_fail)
196 _dbus_initialize_malloc_debug ();
198 fail_alloc_counter = until_next_fail;
201 _dbus_verbose (
"Set fail alloc counter = %d\n", fail_alloc_counter);
212 _dbus_get_fail_alloc_counter (
void)
214 _dbus_initialize_malloc_debug ();
216 return fail_alloc_counter;
226 _dbus_set_fail_alloc_failures (
int failures_per_failure)
228 n_failures_per_failure = failures_per_failure;
238 _dbus_get_fail_alloc_failures (
void)
240 return n_failures_per_failure;
243 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
253 _dbus_decrement_fail_alloc_counter (
void)
255 _dbus_initialize_malloc_debug ();
256 #ifdef DBUS_WIN_FIXME
262 _dbus_verbose(
"TODO: memory allocation testing errors disabled for now\n");
269 if (fail_alloc_counter <= 0)
271 if (backtrace_on_fail_alloc)
274 _dbus_verbose (
"failure %d\n", n_failures_this_failure);
276 n_failures_this_failure += 1;
277 if (n_failures_this_failure >= n_failures_per_failure)
280 fail_alloc_counter = fail_nth;
284 n_failures_this_failure = 0;
286 _dbus_verbose (
"reset fail alloc counter to %d\n", fail_alloc_counter);
293 fail_alloc_counter -= 1;
305 _dbus_get_malloc_blocks_outstanding (
void)
323 source_string (BlockSource source)
333 case SOURCE_MALLOC_ZERO:
335 case SOURCE_REALLOC_NULL:
336 return "realloc(NULL)";
343 check_guards (
void *free_block,
346 if (free_block !=
NULL)
348 unsigned char *block = ((
unsigned char*)free_block) - GUARD_START_OFFSET;
357 _dbus_verbose (
"Checking %d bytes request from source %s\n",
358 requested_bytes, source_string (source));
362 while (i < GUARD_START_OFFSET)
365 if (value != GUARD_VALUE)
367 _dbus_warn (
"Block of %lu bytes from %s had start guard value 0x%ux at %d expected 0x%x\n",
368 (
long) requested_bytes, source_string (source),
369 value, i, GUARD_VALUE);
376 i = GUARD_START_OFFSET + requested_bytes;
377 while (i < (GUARD_START_OFFSET + requested_bytes + GUARD_END_PAD))
380 if (value != GUARD_VALUE)
382 _dbus_warn (
"Block of %lu bytes from %s had end guard value 0x%ux at %d expected 0x%x\n",
383 (
long) requested_bytes, source_string (source),
384 value, i, GUARD_VALUE);
393 memset (free_block,
'g', requested_bytes);
401 set_guards (
void *real_block,
402 size_t requested_bytes,
405 unsigned char *block = real_block;
411 _dbus_assert (GUARD_START_OFFSET + GUARD_END_PAD == GUARD_EXTRA_SIZE);
417 while (i < GUARD_START_OFFSET)
424 i = GUARD_START_OFFSET + requested_bytes;
425 while (i < (GUARD_START_OFFSET + requested_bytes + GUARD_END_PAD))
432 check_guards (block + GUARD_START_OFFSET,
FALSE);
434 return block + GUARD_START_OFFSET;
463 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
464 _dbus_initialize_malloc_debug ();
466 if (_dbus_decrement_fail_alloc_counter ())
468 _dbus_verbose (
" FAILING malloc of %ld bytes\n", (
long) bytes);
475 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
476 else if (fail_size != 0 && bytes > fail_size)
482 block = malloc (bytes + GUARD_EXTRA_SIZE);
487 else if (malloc_cannot_fail)
489 _dbus_warn (
"out of memory: malloc (%ld + %ld)\n",
490 (
long) bytes, (
long) GUARD_EXTRA_SIZE);
494 return set_guards (block, bytes, SOURCE_MALLOC);
500 mem = malloc (bytes);
502 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
507 else if (malloc_cannot_fail)
509 _dbus_warn (
"out of memory: malloc (%ld)\n", (
long) bytes);
533 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
534 _dbus_initialize_malloc_debug ();
536 if (_dbus_decrement_fail_alloc_counter ())
538 _dbus_verbose (
" FAILING malloc0 of %ld bytes\n", (
long) bytes);
546 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
547 else if (fail_size != 0 && bytes > fail_size)
553 block = calloc (bytes + GUARD_EXTRA_SIZE, 1);
559 else if (malloc_cannot_fail)
561 _dbus_warn (
"out of memory: calloc (%ld + %ld, 1)\n",
562 (
long) bytes, (
long) GUARD_EXTRA_SIZE);
566 return set_guards (block, bytes, SOURCE_MALLOC_ZERO);
572 mem = calloc (bytes, 1);
574 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
579 else if (malloc_cannot_fail)
581 _dbus_warn (
"out of memory: calloc (%ld)\n", (
long) bytes);
604 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
605 _dbus_initialize_malloc_debug ();
607 if (_dbus_decrement_fail_alloc_counter ())
609 _dbus_verbose (
" FAILING realloc of %ld bytes\n", (
long) bytes);
620 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
621 else if (fail_size != 0 && bytes > fail_size)
630 check_guards (memory,
FALSE);
632 block = realloc (((
unsigned char*)memory) - GUARD_START_OFFSET,
633 bytes + GUARD_EXTRA_SIZE);
637 if (malloc_cannot_fail)
639 _dbus_warn (
"out of memory: realloc (%p, %ld + %ld)\n",
640 memory, (
long) bytes, (
long) GUARD_EXTRA_SIZE);
648 if (bytes >= old_bytes)
650 check_guards (((
unsigned char*)block) + GUARD_START_OFFSET,
FALSE);
652 return set_guards (block, bytes, SOURCE_REALLOC);
658 block = malloc (bytes + GUARD_EXTRA_SIZE);
664 else if (malloc_cannot_fail)
666 _dbus_warn (
"out of memory: malloc (%ld + %ld)\n",
667 (
long) bytes, (
long) GUARD_EXTRA_SIZE);
671 return set_guards (block, bytes, SOURCE_REALLOC_NULL);
678 mem = realloc (memory, bytes);
680 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
681 if (mem ==
NULL && malloc_cannot_fail)
683 _dbus_warn (
"out of memory: malloc (%ld)\n", (
long) bytes);
703 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
706 check_guards (memory,
TRUE);
709 #ifdef DBUS_DISABLE_ASSERT
718 free (((
unsigned char*)memory) - GUARD_START_OFFSET);
727 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
728 #ifdef DBUS_DISABLE_ASSERT
818 ok = _dbus_register_shutdown_func_unlocked (func, data);
824 _dbus_register_shutdown_func_unlocked (DBusShutdownFunction func,
837 c->
next = registered_globals;
838 registered_globals = c;
892 while (registered_globals !=
NULL)
896 c = registered_globals;
897 registered_globals = c->
next;
909 _dbus_current_generation += 1;
915 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
916 #include "dbus-test.h"
924 _dbus_memory_test (
void)
935 for (size = 4; size < 256; size += 4)
941 for (size = 256; size != 0; size -= 4)
This struct represents a function to be called on shutdown.
unsigned int dbus_uint32_t
A 32-bit unsigned integer on all platforms.
An atomic integer safe to increment or decrement from multiple threads.
dbus_int32_t _dbus_atomic_get(DBusAtomic *atomic)
Atomically get the value of an integer.
#define NULL
A null pointer, defined appropriately for C or C++.
void * dbus_realloc(void *memory, size_t bytes)
Resizes a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
#define dbus_new(type, count)
Safe macro for using dbus_malloc().
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
void * data
Data for function.
#define _DBUS_INT_MAX
Maximum value of type "int".
const char * _dbus_getenv(const char *varname)
Wrapper for getenv().
void _dbus_abort(void)
Aborts the program with SIGABRT (dumping core).
dbus_int32_t _dbus_atomic_dec(DBusAtomic *atomic)
Atomically decrement an integer.
void _dbus_threads_unlock_platform_specific(void)
Undo _dbus_threads_lock_platform_specific().
ShutdownClosure * next
Next ShutdownClosure.
void * dbus_malloc(size_t bytes)
Allocates the given number of bytes, as with standard malloc().
void _dbus_threads_lock_platform_specific(void)
Lock a static mutex used to protect _dbus_threads_init_platform_specific().
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE.
void _dbus_warn(const char *format,...)
Prints a warning message to stderr.
int _dbus_current_generation
_dbus_current_generation is used to track each time that dbus_shutdown() is called, so we can reinit things after it's been called.
dbus_int32_t _dbus_atomic_inc(DBusAtomic *atomic)
Atomically increments an integer.
DBusShutdownFunction func
Function to call.
#define _DBUS_UNLOCK(name)
Unlocks a global lock.
#define TRUE
Expands to "1".
#define _dbus_assert_not_reached(explanation)
Aborts with an error message if called.
void dbus_free_string_array(char **str_array)
Frees a NULL-terminated array of strings.
void dbus_shutdown(void)
Frees all memory allocated internally by libdbus and reverses the effects of dbus_threads_init().
#define FALSE
Expands to "0".
void _dbus_print_backtrace(void)
On GNU libc systems, print a crude backtrace to stderr.
dbus_bool_t _dbus_register_shutdown_func(DBusShutdownFunction func, void *data)
Register a cleanup function to be called exactly once the next time dbus_shutdown() is called...
#define _DBUS_LOCK(name)
Locks a global lock, initializing it first if necessary.
void * dbus_malloc0(size_t bytes)
Allocates the given number of bytes, as with standard malloc(), but all bytes are initialized to zero...
int dbus_int32_t
A 32-bit signed integer on all platforms.