/**
* Frees a block of memory previously allocated by dbus_malloc() or
* dbus_malloc0(). If passed #NULL, does nothing.
*
* @param memory block to be freed
*/
void
dbus_free (void *memory)
{
#ifdef DBUS_BUILD_TESTS
if (guards)
{
check_guards (memory, TRUE);
if (memory)
{
_dbus_atomic_dec (&n_blocks_outstanding);
_dbus_assert (n_blocks_outstanding.value >= 0);
free (((unsigned char*)memory) - GUARD_START_OFFSET);
}
return;
}
#endif
if (memory) /* we guarantee it's safe to free (NULL) */
{
#ifdef DBUS_BUILD_TESTS
_dbus_atomic_dec (&n_blocks_outstanding);
_dbus_assert (n_blocks_outstanding.value >= 0);
#endif
free (memory);
}
}
enum ach_status
ach_open( ach_channel_t *chan, const char *channel_name,
ach_attr_t *attr ) {
ach_header_t * shm;
size_t len;
int fd = -1;
if( attr ) memcpy( &chan->attr, attr, sizeof(chan->attr) );
else memset( &chan->attr, 0, sizeof(chan->attr) );
if( attr && attr->map_anon ) {
shm = attr->shm;
len = sizeof(ach_header_t) + sizeof(ach_index_t)*shm->index_cnt + shm->data_size;
}else {
if( ! channel_name_ok( channel_name ) )
return ACH_INVALID_NAME;
/* open shm */
if( ! channel_name_ok( channel_name ) ) return ACH_INVALID_NAME;
if( (fd = fd_for_channel_name( channel_name, 0 )) < 0 ) {
return check_errno();
}
if( (shm = (ach_header_t*) mmap (NULL, sizeof(ach_header_t),
PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0ul) )
== MAP_FAILED )
return ACH_FAILED_SYSCALL;
if( ACH_SHM_MAGIC_NUM != shm->magic )
return ACH_BAD_SHM_FILE;
/* calculate mmaping size */
len = sizeof(ach_header_t) + sizeof(ach_index_t)*shm->index_cnt + shm->data_size;
/* remap */
if( -1 == munmap( shm, sizeof(ach_header_t) ) )
return check_errno();
if( (shm = (ach_header_t*) mmap( NULL, len, PROT_READ|PROT_WRITE,
MAP_SHARED, fd, 0ul) )
== MAP_FAILED )
return check_errno();
}
/* Check guard bytes */
{
enum ach_status r = check_guards(shm);
if( ACH_OK != r ) return r;
}
/* initialize struct */
chan->fd = fd;
chan->len = len;
chan->shm = shm;
chan->seq_num = 0;
chan->next_index = 1;
chan->cancel = 0;
return ACH_OK;
}
/* returns 1 if valid, *safe == 1 if safe to dump stack */
static inline int check_allocation_locked(struct hdr *hdr, int *safe)
{
int valid = 1;
*safe = 1;
if (hdr->tag != ALLOCATION_TAG && hdr->tag != BACKLOG_TAG) {
log_message("+++ ALLOCATION %p HAS INVALID TAG %08x (NOT DUMPING STACKTRACE)\n",
user(hdr), hdr->tag);
/* Allocation header is probably corrupt, do not dequeue or dump stack
* trace.
*/
*safe = 0;
return 0;
}
if (hdr->tag == BACKLOG_TAG && was_used_after_free(hdr)) {
log_message("+++ ALLOCATION %p SIZE %d WAS USED AFTER BEING FREED\n",
user(hdr), hdr->size);
valid = 0;
/* check the guards to see if it's safe to dump a stack trace */
(void)check_guards(hdr, safe);
}
else
valid = check_guards(hdr, safe);
if (!valid && *safe) {
log_message("+++ ALLOCATION %p SIZE %d ALLOCATED HERE:\n",
user(hdr), hdr->size);
print_backtrace(hdr->bt, hdr->bt_depth);
if (hdr->tag == BACKLOG_TAG) {
log_message("+++ ALLOCATION %p SIZE %d FREED HERE:\n",
user(hdr), hdr->size);
print_backtrace(hdr->freed_bt, hdr->freed_bt_depth);
}
}
return valid;
}
/**
* Frees a block of memory previously allocated by dbus_malloc() or
* dbus_malloc0(). If passed #NULL, does nothing.
*
* @param memory block to be freed
*/
void
dbus_free (void *memory)
{
#ifdef DBUS_ENABLE_EMBEDDED_TESTS
if (guards)
{
check_guards (memory, TRUE);
if (memory)
{
#ifdef DBUS_DISABLE_ASSERT
_dbus_atomic_dec (&n_blocks_outstanding);
#else
dbus_int32_t old_value;
old_value = _dbus_atomic_dec (&n_blocks_outstanding);
_dbus_assert (old_value >= 1);
#endif
free (((unsigned char*)memory) - GUARD_START_OFFSET);
dbus_track_free (memory);
}
return;
}
#endif
if (memory) /* we guarantee it's safe to free (NULL) */
{
#ifdef DBUS_ENABLE_EMBEDDED_TESTS
#ifdef DBUS_DISABLE_ASSERT
_dbus_atomic_dec (&n_blocks_outstanding);
#else
dbus_int32_t old_value;
old_value = _dbus_atomic_dec (&n_blocks_outstanding);
_dbus_assert (old_value >= 1);
#endif
#endif
free (memory);
dbus_track_free (memory);
}
}
static void*
set_guards (void *real_block,
size_t requested_bytes,
BlockSource source)
{
unsigned char *block = real_block;
unsigned int i;
if (block == NULL)
return NULL;
_dbus_assert (GUARD_START_OFFSET + GUARD_END_PAD == GUARD_EXTRA_SIZE);
*((dbus_uint32_t*)block) = requested_bytes;
*((dbus_uint32_t*)(block + 4)) = source;
i = GUARD_INFO_SIZE;
while (i < GUARD_START_OFFSET)
{
(*(dbus_uint32_t*) &block[i]) = GUARD_VALUE;
i += 4;
}
i = GUARD_START_OFFSET + requested_bytes;
while (i < (GUARD_START_OFFSET + requested_bytes + GUARD_END_PAD))
{
(*(dbus_uint32_t*) &block[i]) = GUARD_VALUE;
i += 4;
}
check_guards (block + GUARD_START_OFFSET, FALSE);
return block + GUARD_START_OFFSET;
}
/**
* Resizes a block of memory previously allocated by dbus_malloc() or
* dbus_malloc0(). Guaranteed to free the memory and return #NULL if bytes
* is zero on all platforms. Returns #NULL if the resize fails.
* If the resize fails, the memory is not freed.
*
* @param memory block to be resized
* @param bytes new size of the memory block
* @return allocated memory, or #NULL if the resize fails.
*/
void*
dbus_realloc (void *memory,
size_t bytes)
{
#ifdef DBUS_BUILD_TESTS
_dbus_initialize_malloc_debug ();
if (_dbus_decrement_fail_alloc_counter ())
{
_dbus_verbose (" FAILING realloc of %ld bytes\n", (long) bytes);
return NULL;
}
#endif
if (bytes == 0) /* guarantee this is safe */
{
dbus_free (memory);
return NULL;
}
#ifdef DBUS_BUILD_TESTS
else if (fail_size != 0 && bytes > fail_size)
return NULL;
else if (guards)
{
if (memory)
{
size_t old_bytes;
void *block;
check_guards (memory, FALSE);
block = realloc (((unsigned char*)memory) - GUARD_START_OFFSET,
bytes + GUARD_EXTRA_SIZE);
old_bytes = *(dbus_uint32_t*)block;
if (block && bytes >= old_bytes)
/* old guards shouldn't have moved */
check_guards (((unsigned char*)block) + GUARD_START_OFFSET, FALSE);
return set_guards (block, bytes, SOURCE_REALLOC);
}
else
{
void *block;
block = malloc (bytes + GUARD_EXTRA_SIZE);
if (block)
_dbus_atomic_inc (&n_blocks_outstanding);
return set_guards (block, bytes, SOURCE_REALLOC_NULL);
}
}
#endif
else
{
void *mem;
mem = realloc (memory, bytes);
#ifdef DBUS_BUILD_TESTS
if (memory == NULL && mem != NULL)
_dbus_atomic_inc (&n_blocks_outstanding);
#endif
return mem;
}
}
/**
* Resizes a block of memory previously allocated by dbus_malloc() or
* dbus_malloc0(). Guaranteed to free the memory and return #NULL if bytes
* is zero on all platforms. Returns #NULL if the resize fails.
* If the resize fails, the memory is not freed.
*
* @param memory block to be resized
* @param bytes new size of the memory block
* @return allocated memory, or #NULL if the resize fails.
*/
void*
_dbus_realloc (void *memory,
size_t bytes,
const char *file,
int line)
{
#ifdef DBUS_ENABLE_EMBEDDED_TESTS
_dbus_initialize_malloc_debug ();
if (_dbus_decrement_fail_alloc_counter ())
{
_dbus_verbose (" FAILING realloc of %ld bytes\n", (long) bytes);
return NULL;
}
#endif
if (bytes == 0) /* guarantee this is safe */
{
dbus_free (memory);
return NULL;
}
#ifdef DBUS_ENABLE_EMBEDDED_TESTS
else if (fail_size != 0 && bytes > fail_size)
return NULL;
else if (guards)
{
if (memory)
{
size_t old_bytes;
void *block;
check_guards (memory, FALSE);
block = realloc (((unsigned char*)memory) - GUARD_START_OFFSET,
bytes + GUARD_EXTRA_SIZE);
if (block == NULL)
{
if (malloc_cannot_fail)
{
_dbus_warn ("out of memory: realloc (%p, %ld + %ld)\n",
memory, (long) bytes, (long) GUARD_EXTRA_SIZE);
_dbus_abort ();
}
return NULL;
}
dbus_track_free (((unsigned char*)memory) - GUARD_START_OFFSET);
dbus_track_realloc (((unsigned char*)memory) - GUARD_START_OFFSET, bytes + GUARD_EXTRA_SIZE, file, line);
old_bytes = *(dbus_uint32_t*)block;
if (bytes >= old_bytes)
/* old guards shouldn't have moved */
check_guards (((unsigned char*)block) + GUARD_START_OFFSET, FALSE);
return set_guards (block, bytes, SOURCE_REALLOC);
}
else
{
void *block;
block = malloc (bytes + GUARD_EXTRA_SIZE);
if (block)
{
_dbus_atomic_inc (&n_blocks_outstanding);
dbus_track_malloc(block, bytes + GUARD_EXTRA_SIZE, file, line);
}
else if (malloc_cannot_fail)
{
_dbus_warn ("out of memory: malloc (%ld + %ld)\n",
(long) bytes, (long) GUARD_EXTRA_SIZE);
_dbus_abort ();
}
return set_guards (block, bytes, SOURCE_REALLOC_NULL);
}
}
#endif
else
{
void *mem;
mem = realloc (memory, bytes);
#ifdef DBUS_ENABLE_EMBEDDED_TESTS
if (mem == NULL && malloc_cannot_fail)
{
_dbus_warn ("out of memory: malloc (%ld)\n", (long) bytes);
_dbus_abort ();
}
if (memory == NULL && mem != NULL)
_dbus_atomic_inc (&n_blocks_outstanding);
#endif
dbus_track_free (memory);
dbus_track_realloc (mem, bytes, file, line);
return mem;
}
}