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authorUoti Urpala <uau@symbol.nonexistent.invalid>2008-04-20 04:38:27 +0300
committerUoti Urpala <uau@symbol.nonexistent.invalid>2008-04-23 13:41:06 +0300
commit27a30e310e1d2b2bbc9b381fe08b6ade403784e2 (patch)
tree7f2278b7de591d33459ee678e50189b1b9bcea81 /talloc.c
parentbfe569b76ebc19263efbf717728a6da7c413cbac (diff)
downloadmpv-27a30e310e1d2b2bbc9b381fe08b6ade403784e2.tar.bz2
mpv-27a30e310e1d2b2bbc9b381fe08b6ade403784e2.tar.xz
Add the talloc memory allocator
Copy talloc.c and talloc.h from Samba (last changed 2008-04-17 in commit 7b9a647ebbbe9ec9e1b82b42e3a8916396f91273).
Diffstat (limited to 'talloc.c')
-rw-r--r--talloc.c1724
1 files changed, 1724 insertions, 0 deletions
diff --git a/talloc.c b/talloc.c
new file mode 100644
index 0000000000..12b85f5a65
--- /dev/null
+++ b/talloc.c
@@ -0,0 +1,1724 @@
+/*
+ Samba Unix SMB/CIFS implementation.
+
+ Samba trivial allocation library - new interface
+
+ NOTE: Please read talloc_guide.txt for full documentation
+
+ Copyright (C) Andrew Tridgell 2004
+ Copyright (C) Stefan Metzmacher 2006
+
+ ** NOTE! The following LGPL license applies to the talloc
+ ** library. This does NOT imply that all of Samba is released
+ ** under the LGPL
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 3 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+/*
+ inspired by http://swapped.cc/halloc/
+*/
+
+#ifdef _SAMBA_BUILD_
+#include "version.h"
+#if (SAMBA_VERSION_MAJOR<4)
+#include "includes.h"
+/* This is to circumvent SAMBA3's paranoid malloc checker. Here in this file
+ * we trust ourselves... */
+#ifdef malloc
+#undef malloc
+#endif
+#ifdef realloc
+#undef realloc
+#endif
+#define _TALLOC_SAMBA3
+#endif /* (SAMBA_VERSION_MAJOR<4) */
+#endif /* _SAMBA_BUILD_ */
+
+#ifndef _TALLOC_SAMBA3
+#include "replace.h"
+#include "talloc.h"
+#endif /* not _TALLOC_SAMBA3 */
+
+/* use this to force every realloc to change the pointer, to stress test
+ code that might not cope */
+#define ALWAYS_REALLOC 0
+
+
+#define MAX_TALLOC_SIZE 0x10000000
+#define TALLOC_MAGIC 0xe814ec70
+#define TALLOC_FLAG_FREE 0x01
+#define TALLOC_FLAG_LOOP 0x02
+#define TALLOC_FLAG_POOL 0x04 /* This is a talloc pool */
+#define TALLOC_FLAG_POOLMEM 0x08 /* This is allocated in a pool */
+#define TALLOC_MAGIC_REFERENCE ((const char *)1)
+
+/* by default we abort when given a bad pointer (such as when talloc_free() is called
+ on a pointer that came from malloc() */
+#ifndef TALLOC_ABORT
+#define TALLOC_ABORT(reason) abort()
+#endif
+
+#ifndef discard_const_p
+#if defined(__intptr_t_defined) || defined(HAVE_INTPTR_T)
+# define discard_const_p(type, ptr) ((type *)((intptr_t)(ptr)))
+#else
+# define discard_const_p(type, ptr) ((type *)(ptr))
+#endif
+#endif
+
+/* these macros gain us a few percent of speed on gcc */
+#if (__GNUC__ >= 3)
+/* the strange !! is to ensure that __builtin_expect() takes either 0 or 1
+ as its first argument */
+#define likely(x) __builtin_expect(!!(x), 1)
+#define unlikely(x) __builtin_expect(!!(x), 0)
+#else
+#define likely(x) x
+#define unlikely(x) x
+#endif
+
+/* this null_context is only used if talloc_enable_leak_report() or
+ talloc_enable_leak_report_full() is called, otherwise it remains
+ NULL
+*/
+static void *null_context;
+static void *autofree_context;
+
+struct talloc_reference_handle {
+ struct talloc_reference_handle *next, *prev;
+ void *ptr;
+};
+
+typedef int (*talloc_destructor_t)(void *);
+
+struct talloc_chunk {
+ struct talloc_chunk *next, *prev;
+ struct talloc_chunk *parent, *child;
+ struct talloc_reference_handle *refs;
+ talloc_destructor_t destructor;
+ const char *name;
+ size_t size;
+ unsigned flags;
+
+ /*
+ * "pool" has dual use:
+ *
+ * For the talloc pool itself (i.e. TALLOC_FLAG_POOL is set), "pool"
+ * marks the end of the currently allocated area.
+ *
+ * For members of the pool (i.e. TALLOC_FLAG_POOLMEM is set), "pool"
+ * is a pointer to the struct talloc_chunk of the pool that it was
+ * allocated from. This way children can quickly find the pool to chew
+ * from.
+ */
+ void *pool;
+};
+
+/* 16 byte alignment seems to keep everyone happy */
+#define TC_HDR_SIZE ((sizeof(struct talloc_chunk)+15)&~15)
+#define TC_PTR_FROM_CHUNK(tc) ((void *)(TC_HDR_SIZE + (char*)tc))
+
+static void talloc_abort_double_free(void)
+{
+ TALLOC_ABORT("Bad talloc magic value - double free");
+}
+
+static void talloc_abort_unknown_value(void)
+{
+ TALLOC_ABORT("Bad talloc magic value - unknown value");
+}
+
+/* panic if we get a bad magic value */
+static inline struct talloc_chunk *talloc_chunk_from_ptr(const void *ptr)
+{
+ const char *pp = (const char *)ptr;
+ struct talloc_chunk *tc = discard_const_p(struct talloc_chunk, pp - TC_HDR_SIZE);
+ if (unlikely((tc->flags & (TALLOC_FLAG_FREE | ~0xF)) != TALLOC_MAGIC)) {
+ if (tc->flags & TALLOC_FLAG_FREE) {
+ talloc_abort_double_free();
+ } else {
+ talloc_abort_unknown_value();
+ }
+ }
+ return tc;
+}
+
+/* hook into the front of the list */
+#define _TLIST_ADD(list, p) \
+do { \
+ if (!(list)) { \
+ (list) = (p); \
+ (p)->next = (p)->prev = NULL; \
+ } else { \
+ (list)->prev = (p); \
+ (p)->next = (list); \
+ (p)->prev = NULL; \
+ (list) = (p); \
+ }\
+} while (0)
+
+/* remove an element from a list - element doesn't have to be in list. */
+#define _TLIST_REMOVE(list, p) \
+do { \
+ if ((p) == (list)) { \
+ (list) = (p)->next; \
+ if (list) (list)->prev = NULL; \
+ } else { \
+ if ((p)->prev) (p)->prev->next = (p)->next; \
+ if ((p)->next) (p)->next->prev = (p)->prev; \
+ } \
+ if ((p) && ((p) != (list))) (p)->next = (p)->prev = NULL; \
+} while (0)
+
+
+/*
+ return the parent chunk of a pointer
+*/
+static inline struct talloc_chunk *talloc_parent_chunk(const void *ptr)
+{
+ struct talloc_chunk *tc;
+
+ if (unlikely(ptr == NULL)) {
+ return NULL;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+ while (tc->prev) tc=tc->prev;
+
+ return tc->parent;
+}
+
+void *talloc_parent(const void *ptr)
+{
+ struct talloc_chunk *tc = talloc_parent_chunk(ptr);
+ return tc? TC_PTR_FROM_CHUNK(tc) : NULL;
+}
+
+/*
+ find parents name
+*/
+const char *talloc_parent_name(const void *ptr)
+{
+ struct talloc_chunk *tc = talloc_parent_chunk(ptr);
+ return tc? tc->name : NULL;
+}
+
+/*
+ A pool carries an in-pool object count count in the first 16 bytes.
+ bytes. This is done to support talloc_steal() to a parent outside of the
+ pool. The count includes the pool itself, so a talloc_free() on a pool will
+ only destroy the pool if the count has dropped to zero. A talloc_free() of a
+ pool member will reduce the count, and eventually also call free(3) on the
+ pool memory.
+
+ The object count is not put into "struct talloc_chunk" because it is only
+ relevant for talloc pools and the alignment to 16 bytes would increase the
+ memory footprint of each talloc chunk by those 16 bytes.
+*/
+
+#define TALLOC_POOL_HDR_SIZE 16
+
+static unsigned int *talloc_pool_objectcount(struct talloc_chunk *tc)
+{
+ return (unsigned int *)((char *)tc + sizeof(struct talloc_chunk));
+}
+
+/*
+ Allocate from a pool
+*/
+
+static struct talloc_chunk *talloc_alloc_pool(struct talloc_chunk *parent,
+ size_t size)
+{
+ struct talloc_chunk *pool_ctx = NULL;
+ size_t space_left;
+ struct talloc_chunk *result;
+ size_t chunk_size;
+
+ if (parent == NULL) {
+ return NULL;
+ }
+
+ if (parent->flags & TALLOC_FLAG_POOL) {
+ pool_ctx = parent;
+ }
+ else if (parent->flags & TALLOC_FLAG_POOLMEM) {
+ pool_ctx = (struct talloc_chunk *)parent->pool;
+ }
+
+ if (pool_ctx == NULL) {
+ return NULL;
+ }
+
+ space_left = ((char *)pool_ctx + TC_HDR_SIZE + pool_ctx->size)
+ - ((char *)pool_ctx->pool);
+
+ /*
+ * Align size to 16 bytes
+ */
+ chunk_size = ((size + 15) & ~15);
+
+ if (space_left < chunk_size) {
+ return NULL;
+ }
+
+ result = (struct talloc_chunk *)pool_ctx->pool;
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_UNDEFINED)
+ VALGRIND_MAKE_MEM_UNDEFINED(result, size);
+#endif
+
+ pool_ctx->pool = (void *)((char *)result + chunk_size);
+
+ result->flags = TALLOC_MAGIC | TALLOC_FLAG_POOLMEM;
+ result->pool = pool_ctx;
+
+ *talloc_pool_objectcount(pool_ctx) += 1;
+
+ return result;
+}
+
+/*
+ Allocate a bit of memory as a child of an existing pointer
+*/
+static inline void *__talloc(const void *context, size_t size)
+{
+ struct talloc_chunk *tc = NULL;
+
+ if (unlikely(context == NULL)) {
+ context = null_context;
+ }
+
+ if (unlikely(size >= MAX_TALLOC_SIZE)) {
+ return NULL;
+ }
+
+ if (context != NULL) {
+ tc = talloc_alloc_pool(talloc_chunk_from_ptr(context),
+ TC_HDR_SIZE+size);
+ }
+
+ if (tc == NULL) {
+ tc = (struct talloc_chunk *)malloc(TC_HDR_SIZE+size);
+ if (unlikely(tc == NULL)) return NULL;
+ tc->flags = TALLOC_MAGIC;
+ tc->pool = NULL;
+ }
+
+ tc->size = size;
+ tc->destructor = NULL;
+ tc->child = NULL;
+ tc->name = NULL;
+ tc->refs = NULL;
+
+ if (likely(context)) {
+ struct talloc_chunk *parent = talloc_chunk_from_ptr(context);
+
+ if (parent->child) {
+ parent->child->parent = NULL;
+ tc->next = parent->child;
+ tc->next->prev = tc;
+ } else {
+ tc->next = NULL;
+ }
+ tc->parent = parent;
+ tc->prev = NULL;
+ parent->child = tc;
+ } else {
+ tc->next = tc->prev = tc->parent = NULL;
+ }
+
+ return TC_PTR_FROM_CHUNK(tc);
+}
+
+/*
+ * Create a talloc pool
+ */
+
+void *talloc_pool(const void *context, size_t size)
+{
+ void *result = __talloc(context, size + TALLOC_POOL_HDR_SIZE);
+ struct talloc_chunk *tc;
+
+ if (unlikely(result == NULL)) {
+ return NULL;
+ }
+
+ tc = talloc_chunk_from_ptr(result);
+
+ tc->flags |= TALLOC_FLAG_POOL;
+ tc->pool = (char *)result + TALLOC_POOL_HDR_SIZE;
+
+ *talloc_pool_objectcount(tc) = 1;
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_NOACCESS)
+ VALGRIND_MAKE_MEM_NOACCESS(tc->pool, size);
+#endif
+
+ return result;
+}
+
+/*
+ setup a destructor to be called on free of a pointer
+ the destructor should return 0 on success, or -1 on failure.
+ if the destructor fails then the free is failed, and the memory can
+ be continued to be used
+*/
+void _talloc_set_destructor(const void *ptr, int (*destructor)(void *))
+{
+ struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
+ tc->destructor = destructor;
+}
+
+/*
+ increase the reference count on a piece of memory.
+*/
+int talloc_increase_ref_count(const void *ptr)
+{
+ if (unlikely(!talloc_reference(null_context, ptr))) {
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ helper for talloc_reference()
+
+ this is referenced by a function pointer and should not be inline
+*/
+static int talloc_reference_destructor(struct talloc_reference_handle *handle)
+{
+ struct talloc_chunk *ptr_tc = talloc_chunk_from_ptr(handle->ptr);
+ _TLIST_REMOVE(ptr_tc->refs, handle);
+ return 0;
+}
+
+/*
+ more efficient way to add a name to a pointer - the name must point to a
+ true string constant
+*/
+static inline void _talloc_set_name_const(const void *ptr, const char *name)
+{
+ struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
+ tc->name = name;
+}
+
+/*
+ internal talloc_named_const()
+*/
+static inline void *_talloc_named_const(const void *context, size_t size, const char *name)
+{
+ void *ptr;
+
+ ptr = __talloc(context, size);
+ if (unlikely(ptr == NULL)) {
+ return NULL;
+ }
+
+ _talloc_set_name_const(ptr, name);
+
+ return ptr;
+}
+
+/*
+ make a secondary reference to a pointer, hanging off the given context.
+ the pointer remains valid until both the original caller and this given
+ context are freed.
+
+ the major use for this is when two different structures need to reference the
+ same underlying data, and you want to be able to free the two instances separately,
+ and in either order
+*/
+void *_talloc_reference(const void *context, const void *ptr)
+{
+ struct talloc_chunk *tc;
+ struct talloc_reference_handle *handle;
+ if (unlikely(ptr == NULL)) return NULL;
+
+ tc = talloc_chunk_from_ptr(ptr);
+ handle = (struct talloc_reference_handle *)_talloc_named_const(context,
+ sizeof(struct talloc_reference_handle),
+ TALLOC_MAGIC_REFERENCE);
+ if (unlikely(handle == NULL)) return NULL;
+
+ /* note that we hang the destructor off the handle, not the
+ main context as that allows the caller to still setup their
+ own destructor on the context if they want to */
+ talloc_set_destructor(handle, talloc_reference_destructor);
+ handle->ptr = discard_const_p(void, ptr);
+ _TLIST_ADD(tc->refs, handle);
+ return handle->ptr;
+}
+
+
+/*
+ internal talloc_free call
+*/
+static inline int _talloc_free(void *ptr)
+{
+ struct talloc_chunk *tc;
+
+ if (unlikely(ptr == NULL)) {
+ return -1;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+
+ if (unlikely(tc->refs)) {
+ int is_child;
+ /* check this is a reference from a child or grantchild
+ * back to it's parent or grantparent
+ *
+ * in that case we need to remove the reference and
+ * call another instance of talloc_free() on the current
+ * pointer.
+ */
+ is_child = talloc_is_parent(tc->refs, ptr);
+ _talloc_free(tc->refs);
+ if (is_child) {
+ return _talloc_free(ptr);
+ }
+ return -1;
+ }
+
+ if (unlikely(tc->flags & TALLOC_FLAG_LOOP)) {
+ /* we have a free loop - stop looping */
+ return 0;
+ }
+
+ if (unlikely(tc->destructor)) {
+ talloc_destructor_t d = tc->destructor;
+ if (d == (talloc_destructor_t)-1) {
+ return -1;
+ }
+ tc->destructor = (talloc_destructor_t)-1;
+ if (d(ptr) == -1) {
+ tc->destructor = d;
+ return -1;
+ }
+ tc->destructor = NULL;
+ }
+
+ if (tc->parent) {
+ _TLIST_REMOVE(tc->parent->child, tc);
+ if (tc->parent->child) {
+ tc->parent->child->parent = tc->parent;
+ }
+ } else {
+ if (tc->prev) tc->prev->next = tc->next;
+ if (tc->next) tc->next->prev = tc->prev;
+ }
+
+ tc->flags |= TALLOC_FLAG_LOOP;
+
+ while (tc->child) {
+ /* we need to work out who will own an abandoned child
+ if it cannot be freed. In priority order, the first
+ choice is owner of any remaining reference to this
+ pointer, the second choice is our parent, and the
+ final choice is the null context. */
+ void *child = TC_PTR_FROM_CHUNK(tc->child);
+ const void *new_parent = null_context;
+ if (unlikely(tc->child->refs)) {
+ struct talloc_chunk *p = talloc_parent_chunk(tc->child->refs);
+ if (p) new_parent = TC_PTR_FROM_CHUNK(p);
+ }
+ if (unlikely(_talloc_free(child) == -1)) {
+ if (new_parent == null_context) {
+ struct talloc_chunk *p = talloc_parent_chunk(ptr);
+ if (p) new_parent = TC_PTR_FROM_CHUNK(p);
+ }
+ talloc_steal(new_parent, child);
+ }
+ }
+
+ tc->flags |= TALLOC_FLAG_FREE;
+
+ if (tc->flags & (TALLOC_FLAG_POOL|TALLOC_FLAG_POOLMEM)) {
+ struct talloc_chunk *pool;
+ unsigned int *pool_object_count;
+
+ pool = (tc->flags & TALLOC_FLAG_POOL)
+ ? tc : (struct talloc_chunk *)tc->pool;
+
+ pool_object_count = talloc_pool_objectcount(pool);
+
+ if (*pool_object_count == 0) {
+ TALLOC_ABORT("Pool object count zero!");
+ }
+
+ *pool_object_count -= 1;
+
+ if (*pool_object_count == 0) {
+ free(pool);
+ }
+ }
+ else {
+ free(tc);
+ }
+ return 0;
+}
+
+/*
+ move a lump of memory from one talloc context to another return the
+ ptr on success, or NULL if it could not be transferred.
+ passing NULL as ptr will always return NULL with no side effects.
+*/
+void *_talloc_steal(const void *new_ctx, const void *ptr)
+{
+ struct talloc_chunk *tc, *new_tc;
+
+ if (unlikely(!ptr)) {
+ return NULL;
+ }
+
+ if (unlikely(new_ctx == NULL)) {
+ new_ctx = null_context;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+
+ if (unlikely(new_ctx == NULL)) {
+ if (tc->parent) {
+ _TLIST_REMOVE(tc->parent->child, tc);
+ if (tc->parent->child) {
+ tc->parent->child->parent = tc->parent;
+ }
+ } else {
+ if (tc->prev) tc->prev->next = tc->next;
+ if (tc->next) tc->next->prev = tc->prev;
+ }
+
+ tc->parent = tc->next = tc->prev = NULL;
+ return discard_const_p(void, ptr);
+ }
+
+ new_tc = talloc_chunk_from_ptr(new_ctx);
+
+ if (unlikely(tc == new_tc || tc->parent == new_tc)) {
+ return discard_const_p(void, ptr);
+ }
+
+ if (tc->parent) {
+ _TLIST_REMOVE(tc->parent->child, tc);
+ if (tc->parent->child) {
+ tc->parent->child->parent = tc->parent;
+ }
+ } else {
+ if (tc->prev) tc->prev->next = tc->next;
+ if (tc->next) tc->next->prev = tc->prev;
+ }
+
+ tc->parent = new_tc;
+ if (new_tc->child) new_tc->child->parent = NULL;
+ _TLIST_ADD(new_tc->child, tc);
+
+ return discard_const_p(void, ptr);
+}
+
+
+
+/*
+ remove a secondary reference to a pointer. This undo's what
+ talloc_reference() has done. The context and pointer arguments
+ must match those given to a talloc_reference()
+*/
+static inline int talloc_unreference(const void *context, const void *ptr)
+{
+ struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
+ struct talloc_reference_handle *h;
+
+ if (unlikely(context == NULL)) {
+ context = null_context;
+ }
+
+ for (h=tc->refs;h;h=h->next) {
+ struct talloc_chunk *p = talloc_parent_chunk(h);
+ if (p == NULL) {
+ if (context == NULL) break;
+ } else if (TC_PTR_FROM_CHUNK(p) == context) {
+ break;
+ }
+ }
+ if (h == NULL) {
+ return -1;
+ }
+
+ return _talloc_free(h);
+}
+
+/*
+ remove a specific parent context from a pointer. This is a more
+ controlled varient of talloc_free()
+*/
+int talloc_unlink(const void *context, void *ptr)
+{
+ struct talloc_chunk *tc_p, *new_p;
+ void *new_parent;
+
+ if (ptr == NULL) {
+ return -1;
+ }
+
+ if (context == NULL) {
+ context = null_context;
+ }
+
+ if (talloc_unreference(context, ptr) == 0) {
+ return 0;
+ }
+
+ if (context == NULL) {
+ if (talloc_parent_chunk(ptr) != NULL) {
+ return -1;
+ }
+ } else {
+ if (talloc_chunk_from_ptr(context) != talloc_parent_chunk(ptr)) {
+ return -1;
+ }
+ }
+
+ tc_p = talloc_chunk_from_ptr(ptr);
+
+ if (tc_p->refs == NULL) {
+ return _talloc_free(ptr);
+ }
+
+ new_p = talloc_parent_chunk(tc_p->refs);
+ if (new_p) {
+ new_parent = TC_PTR_FROM_CHUNK(new_p);
+ } else {
+ new_parent = NULL;
+ }
+
+ if (talloc_unreference(new_parent, ptr) != 0) {
+ return -1;
+ }
+
+ talloc_steal(new_parent, ptr);
+
+ return 0;
+}
+
+/*
+ add a name to an existing pointer - va_list version
+*/
+static inline const char *talloc_set_name_v(const void *ptr, const char *fmt, va_list ap) PRINTF_ATTRIBUTE(2,0);
+
+static inline const char *talloc_set_name_v(const void *ptr, const char *fmt, va_list ap)
+{
+ struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
+ tc->name = talloc_vasprintf(ptr, fmt, ap);
+ if (likely(tc->name)) {
+ _talloc_set_name_const(tc->name, ".name");
+ }
+ return tc->name;
+}
+
+/*
+ add a name to an existing pointer
+*/
+const char *talloc_set_name(const void *ptr, const char *fmt, ...)
+{
+ const char *name;
+ va_list ap;
+ va_start(ap, fmt);
+ name = talloc_set_name_v(ptr, fmt, ap);
+ va_end(ap);
+ return name;
+}
+
+
+/*
+ create a named talloc pointer. Any talloc pointer can be named, and
+ talloc_named() operates just like talloc() except that it allows you
+ to name the pointer.
+*/
+void *talloc_named(const void *context, size_t size, const char *fmt, ...)
+{
+ va_list ap;
+ void *ptr;
+ const char *name;
+
+ ptr = __talloc(context, size);
+ if (unlikely(ptr == NULL)) return NULL;
+
+ va_start(ap, fmt);
+ name = talloc_set_name_v(ptr, fmt, ap);
+ va_end(ap);
+
+ if (unlikely(name == NULL)) {
+ _talloc_free(ptr);
+ return NULL;
+ }
+
+ return ptr;
+}
+
+/*
+ return the name of a talloc ptr, or "UNNAMED"
+*/
+const char *talloc_get_name(const void *ptr)
+{
+ struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
+ if (unlikely(tc->name == TALLOC_MAGIC_REFERENCE)) {
+ return ".reference";
+ }
+ if (likely(tc->name)) {
+ return tc->name;
+ }
+ return "UNNAMED";
+}
+
+
+/*
+ check if a pointer has the given name. If it does, return the pointer,
+ otherwise return NULL
+*/
+void *talloc_check_name(const void *ptr, const char *name)
+{
+ const char *pname;
+ if (unlikely(ptr == NULL)) return NULL;
+ pname = talloc_get_name(ptr);
+ if (likely(pname == name || strcmp(pname, name) == 0)) {
+ return discard_const_p(void, ptr);
+ }
+ return NULL;
+}
+
+
+/*
+ this is for compatibility with older versions of talloc
+*/
+void *talloc_init(const char *fmt, ...)
+{
+ va_list ap;
+ void *ptr;
+ const char *name;
+
+ /*
+ * samba3 expects talloc_report_depth_cb(NULL, ...)
+ * reports all talloc'ed memory, so we need to enable
+ * null_tracking
+ */
+ talloc_enable_null_tracking();
+
+ ptr = __talloc(NULL, 0);
+ if (unlikely(ptr == NULL)) return NULL;
+
+ va_start(ap, fmt);
+ name = talloc_set_name_v(ptr, fmt, ap);
+ va_end(ap);
+
+ if (unlikely(name == NULL)) {
+ _talloc_free(ptr);
+ return NULL;
+ }
+
+ return ptr;
+}
+
+/*
+ this is a replacement for the Samba3 talloc_destroy_pool functionality. It
+ should probably not be used in new code. It's in here to keep the talloc
+ code consistent across Samba 3 and 4.
+*/
+void talloc_free_children(void *ptr)
+{
+ struct talloc_chunk *tc;
+
+ if (unlikely(ptr == NULL)) {
+ return;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+
+ while (tc->child) {
+ /* we need to work out who will own an abandoned child
+ if it cannot be freed. In priority order, the first
+ choice is owner of any remaining reference to this
+ pointer, the second choice is our parent, and the
+ final choice is the null context. */
+ void *child = TC_PTR_FROM_CHUNK(tc->child);
+ const void *new_parent = null_context;
+ if (unlikely(tc->child->refs)) {
+ struct talloc_chunk *p = talloc_parent_chunk(tc->child->refs);
+ if (p) new_parent = TC_PTR_FROM_CHUNK(p);
+ }
+ if (unlikely(_talloc_free(child) == -1)) {
+ if (new_parent == null_context) {
+ struct talloc_chunk *p = talloc_parent_chunk(ptr);
+ if (p) new_parent = TC_PTR_FROM_CHUNK(p);
+ }
+ talloc_steal(new_parent, child);
+ }
+ }
+
+ if ((tc->flags & TALLOC_FLAG_POOL)
+ && (*talloc_pool_objectcount(tc) == 1)) {
+ tc->pool = ((char *)tc + TC_HDR_SIZE + TALLOC_POOL_HDR_SIZE);
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_NOACCESS)
+ VALGRIND_MAKE_MEM_NOACCESS(
+ tc->pool, tc->size - TALLOC_POOL_HDR_SIZE);
+#endif
+ }
+}
+
+/*
+ Allocate a bit of memory as a child of an existing pointer
+*/
+void *_talloc(const void *context, size_t size)
+{
+ return __talloc(context, size);
+}
+
+/*
+ externally callable talloc_set_name_const()
+*/
+void talloc_set_name_const(const void *ptr, const char *name)
+{
+ _talloc_set_name_const(ptr, name);
+}
+
+/*
+ create a named talloc pointer. Any talloc pointer can be named, and
+ talloc_named() operates just like talloc() except that it allows you
+ to name the pointer.
+*/
+void *talloc_named_const(const void *context, size_t size, const char *name)
+{
+ return _talloc_named_const(context, size, name);
+}
+
+/*
+ free a talloc pointer. This also frees all child pointers of this
+ pointer recursively
+
+ return 0 if the memory is actually freed, otherwise -1. The memory
+ will not be freed if the ref_count is > 1 or the destructor (if
+ any) returns non-zero
+*/
+int talloc_free(void *ptr)
+{
+ return _talloc_free(ptr);
+}
+
+
+
+/*
+ A talloc version of realloc. The context argument is only used if
+ ptr is NULL
+*/
+void *_talloc_realloc(const void *context, void *ptr, size_t size, const char *name)
+{
+ struct talloc_chunk *tc;
+ void *new_ptr;
+ bool malloced = false;
+
+ /* size zero is equivalent to free() */
+ if (unlikely(size == 0)) {
+ _talloc_free(ptr);
+ return NULL;
+ }
+
+ if (unlikely(size >= MAX_TALLOC_SIZE)) {
+ return NULL;
+ }
+
+ /* realloc(NULL) is equivalent to malloc() */
+ if (ptr == NULL) {
+ return _talloc_named_const(context, size, name);
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+
+ /* don't allow realloc on referenced pointers */
+ if (unlikely(tc->refs)) {
+ return NULL;
+ }
+
+ /* don't shrink if we have less than 1k to gain */
+ if ((size < tc->size) && ((tc->size - size) < 1024)) {
+ tc->size = size;
+ return ptr;
+ }
+
+ /* by resetting magic we catch users of the old memory */
+ tc->flags |= TALLOC_FLAG_FREE;
+
+#if ALWAYS_REALLOC
+ new_ptr = malloc(size + TC_HDR_SIZE);
+ if (new_ptr) {
+ memcpy(new_ptr, tc, tc->size + TC_HDR_SIZE);
+ free(tc);
+ }
+#else
+ if (tc->flags & TALLOC_FLAG_POOLMEM) {
+
+ new_ptr = talloc_alloc_pool(tc, size + TC_HDR_SIZE);
+ *talloc_pool_objectcount((struct talloc_chunk *)
+ (tc->pool)) -= 1;
+
+ if (new_ptr == NULL) {
+ new_ptr = malloc(TC_HDR_SIZE+size);
+ malloced = true;
+ }
+
+ if (new_ptr) {
+ memcpy(new_ptr, tc, MIN(tc->size,size) + TC_HDR_SIZE);
+ }
+ }
+ else {
+ new_ptr = realloc(tc, size + TC_HDR_SIZE);
+ }
+#endif
+ if (unlikely(!new_ptr)) {
+ tc->flags &= ~TALLOC_FLAG_FREE;
+ return NULL;
+ }
+
+ tc = (struct talloc_chunk *)new_ptr;
+ tc->flags &= ~TALLOC_FLAG_FREE;
+ if (malloced) {
+ tc->flags &= ~TALLOC_FLAG_POOLMEM;
+ }
+ if (tc->parent) {
+ tc->parent->child = tc;
+ }
+ if (tc->child) {
+ tc->child->parent = tc;
+ }
+
+ if (tc->prev) {
+ tc->prev->next = tc;
+ }
+ if (tc->next) {
+ tc->next->prev = tc;
+ }
+
+ tc->size = size;
+ _talloc_set_name_const(TC_PTR_FROM_CHUNK(tc), name);
+
+ return TC_PTR_FROM_CHUNK(tc);
+}
+
+/*
+ a wrapper around talloc_steal() for situations where you are moving a pointer
+ between two structures, and want the old pointer to be set to NULL
+*/
+void *_talloc_move(const void *new_ctx, const void *_pptr)
+{
+ const void **pptr = discard_const_p(const void *,_pptr);
+ void *ret = _talloc_steal(new_ctx, *pptr);
+ (*pptr) = NULL;
+ return ret;
+}
+
+/*
+ return the total size of a talloc pool (subtree)
+*/
+size_t talloc_total_size(const void *ptr)
+{
+ size_t total = 0;
+ struct talloc_chunk *c, *tc;
+
+ if (ptr == NULL) {
+ ptr = null_context;
+ }
+ if (ptr == NULL) {
+ return 0;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+
+ if (tc->flags & TALLOC_FLAG_LOOP) {
+ return 0;
+ }
+
+ tc->flags |= TALLOC_FLAG_LOOP;
+
+ total = tc->size;
+ for (c=tc->child;c;c=c->next) {
+ total += talloc_total_size(TC_PTR_FROM_CHUNK(c));
+ }
+
+ tc->flags &= ~TALLOC_FLAG_LOOP;
+
+ return total;
+}
+
+/*
+ return the total number of blocks in a talloc pool (subtree)
+*/
+size_t talloc_total_blocks(const void *ptr)
+{
+ size_t total = 0;
+ struct talloc_chunk *c, *tc = talloc_chunk_from_ptr(ptr);
+
+ if (tc->flags & TALLOC_FLAG_LOOP) {
+ return 0;
+ }
+
+ tc->flags |= TALLOC_FLAG_LOOP;
+
+ total++;
+ for (c=tc->child;c;c=c->next) {
+ total += talloc_total_blocks(TC_PTR_FROM_CHUNK(c));
+ }
+
+ tc->flags &= ~TALLOC_FLAG_LOOP;
+
+ return total;
+}
+
+/*
+ return the number of external references to a pointer
+*/
+size_t talloc_reference_count(const void *ptr)
+{
+ struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
+ struct talloc_reference_handle *h;
+ size_t ret = 0;
+
+ for (h=tc->refs;h;h=h->next) {
+ ret++;
+ }
+ return ret;
+}
+
+/*
+ report on memory usage by all children of a pointer, giving a full tree view
+*/
+void talloc_report_depth_cb(const void *ptr, int depth, int max_depth,
+ void (*callback)(const void *ptr,
+ int depth, int max_depth,
+ int is_ref,
+ void *private_data),
+ void *private_data)
+{
+ struct talloc_chunk *c, *tc;
+
+ if (ptr == NULL) {
+ ptr = null_context;
+ }
+ if (ptr == NULL) return;
+
+ tc = talloc_chunk_from_ptr(ptr);
+
+ if (tc->flags & TALLOC_FLAG_LOOP) {
+ return;
+ }
+
+ callback(ptr, depth, max_depth, 0, private_data);
+
+ if (max_depth >= 0 && depth >= max_depth) {
+ return;
+ }
+
+ tc->flags |= TALLOC_FLAG_LOOP;
+ for (c=tc->child;c;c=c->next) {
+ if (c->name == TALLOC_MAGIC_REFERENCE) {
+ struct talloc_reference_handle *h = (struct talloc_reference_handle *)TC_PTR_FROM_CHUNK(c);
+ callback(h->ptr, depth + 1, max_depth, 1, private_data);
+ } else {
+ talloc_report_depth_cb(TC_PTR_FROM_CHUNK(c), depth + 1, max_depth, callback, private_data);
+ }
+ }
+ tc->flags &= ~TALLOC_FLAG_LOOP;
+}
+
+static void talloc_report_depth_FILE_helper(const void *ptr, int depth, int max_depth, int is_ref, void *_f)
+{
+ const char *name = talloc_get_name(ptr);
+ FILE *f = (FILE *)_f;
+
+ if (is_ref) {
+ fprintf(f, "%*sreference to: %s\n", depth*4, "", name);
+ return;
+ }
+
+ if (depth == 0) {
+ fprintf(f,"%stalloc report on '%s' (total %6lu bytes in %3lu blocks)\n",
+ (max_depth < 0 ? "full " :""), name,
+ (unsigned long)talloc_total_size(ptr),
+ (unsigned long)talloc_total_blocks(ptr));
+ return;
+ }
+
+ fprintf(f, "%*s%-30s contains %6lu bytes in %3lu blocks (ref %d) %p\n",
+ depth*4, "",
+ name,
+ (unsigned long)talloc_total_size(ptr),
+ (unsigned long)talloc_total_blocks(ptr),
+ (int)talloc_reference_count(ptr), ptr);
+
+#if 0
+ fprintf(f, "content: ");
+ if (talloc_total_size(ptr)) {
+ int tot = talloc_total_size(ptr);
+ int i;
+
+ for (i = 0; i < tot; i++) {
+ if ((((char *)ptr)[i] > 31) && (((char *)ptr)[i] < 126)) {
+ fprintf(f, "%c", ((char *)ptr)[i]);
+ } else {
+ fprintf(f, "~%02x", ((char *)ptr)[i]);
+ }
+ }
+ }
+ fprintf(f, "\n");
+#endif
+}
+
+/*
+ report on memory usage by all children of a pointer, giving a full tree view
+*/
+void talloc_report_depth_file(const void *ptr, int depth, int max_depth, FILE *f)
+{
+ talloc_report_depth_cb(ptr, depth, max_depth, talloc_report_depth_FILE_helper, f);
+ fflush(f);
+}
+
+/*
+ report on memory usage by all children of a pointer, giving a full tree view
+*/
+void talloc_report_full(const void *ptr, FILE *f)
+{
+ talloc_report_depth_file(ptr, 0, -1, f);
+}
+
+/*
+ report on memory usage by all children of a pointer
+*/
+void talloc_report(const void *ptr, FILE *f)
+{
+ talloc_report_depth_file(ptr, 0, 1, f);
+}
+
+/*
+ report on any memory hanging off the null context
+*/
+static void talloc_report_null(void)
+{
+ if (talloc_total_size(null_context) != 0) {
+ talloc_report(null_context, stderr);
+ }
+}
+
+/*
+ report on any memory hanging off the null context
+*/
+static void talloc_report_null_full(void)
+{
+ if (talloc_total_size(null_context) != 0) {
+ talloc_report_full(null_context, stderr);
+ }
+}
+
+/*
+ enable tracking of the NULL context
+*/
+void talloc_enable_null_tracking(void)
+{
+ if (null_context == NULL) {
+ null_context = _talloc_named_const(NULL, 0, "null_context");
+ }
+}
+
+/*
+ disable tracking of the NULL context
+*/
+void talloc_disable_null_tracking(void)
+{
+ _talloc_free(null_context);
+ null_context = NULL;
+}
+
+/*
+ enable leak reporting on exit
+*/
+void talloc_enable_leak_report(void)
+{
+ talloc_enable_null_tracking();
+ atexit(talloc_report_null);
+}
+
+/*
+ enable full leak reporting on exit
+*/
+void talloc_enable_leak_report_full(void)
+{
+ talloc_enable_null_tracking();
+ atexit(talloc_report_null_full);
+}
+
+/*
+ talloc and zero memory.
+*/
+void *_talloc_zero(const void *ctx, size_t size, const char *name)
+{
+ void *p = _talloc_named_const(ctx, size, name);
+
+ if (p) {
+ memset(p, '\0', size);
+ }
+
+ return p;
+}
+
+/*
+ memdup with a talloc.
+*/
+void *_talloc_memdup(const void *t, const void *p, size_t size, const char *name)
+{
+ void *newp = _talloc_named_const(t, size, name);
+
+ if (likely(newp)) {
+ memcpy(newp, p, size);
+ }
+
+ return newp;
+}
+
+static inline char *__talloc_strlendup(const void *t, const char *p, size_t len)
+{
+ char *ret;
+
+ ret = (char *)__talloc(t, len + 1);
+ if (unlikely(!ret)) return NULL;
+
+ memcpy(ret, p, len);
+ ret[len] = 0;
+
+ _talloc_set_name_const(ret, ret);
+ return ret;
+}
+
+/*
+ strdup with a talloc
+*/
+char *talloc_strdup(const void *t, const char *p)
+{
+ if (unlikely(!p)) return NULL;
+ return __talloc_strlendup(t, p, strlen(p));
+}
+
+/*
+ strndup with a talloc
+*/
+char *talloc_strndup(const void *t, const char *p, size_t n)
+{
+ if (unlikely(!p)) return NULL;
+ return __talloc_strlendup(t, p, strnlen(p, n));
+}
+
+static inline char *__talloc_strlendup_append(char *s, size_t slen,
+ const char *a, size_t alen)
+{
+ char *ret;
+
+ ret = talloc_realloc(NULL, s, char, slen + alen + 1);
+ if (unlikely(!ret)) return NULL;
+
+ /* append the string and the trailing \0 */
+ memcpy(&ret[slen], a, alen);
+ ret[slen+alen] = 0;
+
+ _talloc_set_name_const(ret, ret);
+ return ret;
+}
+
+/*
+ * Appends at the end of the string.
+ */
+char *talloc_strdup_append(char *s, const char *a)
+{
+ if (unlikely(!s)) {
+ return talloc_strdup(NULL, a);
+ }
+
+ if (unlikely(!a)) {
+ return s;
+ }
+
+ return __talloc_strlendup_append(s, strlen(s), a, strlen(a));
+}
+
+/*
+ * Appends at the end of the talloc'ed buffer,
+ * not the end of the string.
+ */
+char *talloc_strdup_append_buffer(char *s, const char *a)
+{
+ size_t slen;
+
+ if (unlikely(!s)) {
+ return talloc_strdup(NULL, a);
+ }
+
+ if (unlikely(!a)) {
+ return s;
+ }
+
+ slen = talloc_get_size(s);
+ if (likely(slen > 0)) {
+ slen--;
+ }
+
+ return __talloc_strlendup_append(s, slen, a, strlen(a));
+}
+
+/*
+ * Appends at the end of the string.
+ */
+char *talloc_strndup_append(char *s, const char *a, size_t n)
+{
+ if (unlikely(!s)) {
+ return talloc_strdup(NULL, a);
+ }
+
+ if (unlikely(!a)) {
+ return s;
+ }
+
+ return __talloc_strlendup_append(s, strlen(s), a, strnlen(a, n));
+}
+
+/*
+ * Appends at the end of the talloc'ed buffer,
+ * not the end of the string.
+ */
+char *talloc_strndup_append_buffer(char *s, const char *a, size_t n)
+{
+ size_t slen;
+
+ if (unlikely(!s)) {
+ return talloc_strdup(NULL, a);
+ }
+
+ if (unlikely(!a)) {
+ return s;
+ }
+
+ slen = talloc_get_size(s);
+ if (likely(slen > 0)) {
+ slen--;
+ }
+
+ return __talloc_strlendup_append(s, slen, a, strnlen(a, n));
+}
+
+#ifndef HAVE_VA_COPY
+#ifdef HAVE___VA_COPY
+#define va_copy(dest, src) __va_copy(dest, src)
+#else
+#define va_copy(dest, src) (dest) = (src)
+#endif
+#endif
+
+char *talloc_vasprintf(const void *t, const char *fmt, va_list ap)
+{
+ int len;
+ char *ret;
+ va_list ap2;
+ char c;
+
+ /* this call looks strange, but it makes it work on older solaris boxes */
+ va_copy(ap2, ap);
+ len = vsnprintf(&c, 1, fmt, ap2);
+ va_end(ap2);
+ if (unlikely(len < 0)) {
+ return NULL;
+ }
+
+ ret = (char *)__talloc(t, len+1);
+ if (unlikely(!ret)) return NULL;
+
+ va_copy(ap2, ap);
+ vsnprintf(ret, len+1, fmt, ap2);
+ va_end(ap2);
+
+ _talloc_set_name_const(ret, ret);
+ return ret;
+}
+
+
+/*
+ Perform string formatting, and return a pointer to newly allocated
+ memory holding the result, inside a memory pool.
+ */
+char *talloc_asprintf(const void *t, const char *fmt, ...)
+{
+ va_list ap;
+ char *ret;
+
+ va_start(ap, fmt);
+ ret = talloc_vasprintf(t, fmt, ap);
+ va_end(ap);
+ return ret;
+}
+
+static inline char *__talloc_vaslenprintf_append(char *s, size_t slen,
+ const char *fmt, va_list ap)
+ PRINTF_ATTRIBUTE(3,0);
+
+static inline char *__talloc_vaslenprintf_append(char *s, size_t slen,
+ const char *fmt, va_list ap)
+{
+ ssize_t alen;
+ va_list ap2;
+ char c;
+
+ va_copy(ap2, ap);
+ alen = vsnprintf(&c, 1, fmt, ap2);
+ va_end(ap2);
+
+ if (alen <= 0) {
+ /* Either the vsnprintf failed or the format resulted in
+ * no characters being formatted. In the former case, we
+ * ought to return NULL, in the latter we ought to return
+ * the original string. Most current callers of this
+ * function expect it to never return NULL.
+ */
+ return s;
+ }
+
+ s = talloc_realloc(NULL, s, char, slen + alen + 1);
+ if (!s) return NULL;
+
+ va_copy(ap2, ap);
+ vsnprintf(s + slen, alen + 1, fmt, ap2);
+ va_end(ap2);
+
+ _talloc_set_name_const(s, s);
+ return s;
+}
+
+/**
+ * Realloc @p s to append the formatted result of @p fmt and @p ap,
+ * and return @p s, which may have moved. Good for gradually
+ * accumulating output into a string buffer. Appends at the end
+ * of the string.
+ **/
+char *talloc_vasprintf_append(char *s, const char *fmt, va_list ap)
+{
+ if (unlikely(!s)) {
+ return talloc_vasprintf(NULL, fmt, ap);
+ }
+
+ return __talloc_vaslenprintf_append(s, strlen(s), fmt, ap);
+}
+
+/**
+ * Realloc @p s to append the formatted result of @p fmt and @p ap,
+ * and return @p s, which may have moved. Always appends at the
+ * end of the talloc'ed buffer, not the end of the string.
+ **/
+char *talloc_vasprintf_append_buffer(char *s, const char *fmt, va_list ap)
+{
+ size_t slen;
+
+ if (unlikely(!s)) {
+ return talloc_vasprintf(NULL, fmt, ap);
+ }
+
+ slen = talloc_get_size(s);
+ if (likely(slen > 0)) {
+ slen--;
+ }
+
+ return __talloc_vaslenprintf_append(s, slen, fmt, ap);
+}
+
+/*
+ Realloc @p s to append the formatted result of @p fmt and return @p
+ s, which may have moved. Good for gradually accumulating output
+ into a string buffer.
+ */
+char *talloc_asprintf_append(char *s, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ s = talloc_vasprintf_append(s, fmt, ap);
+ va_end(ap);
+ return s;
+}
+
+/*
+ Realloc @p s to append the formatted result of @p fmt and return @p
+ s, which may have moved. Good for gradually accumulating output
+ into a buffer.
+ */
+char *talloc_asprintf_append_buffer(char *s, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ s = talloc_vasprintf_append_buffer(s, fmt, ap);
+ va_end(ap);
+ return s;
+}
+
+/*
+ alloc an array, checking for integer overflow in the array size
+*/
+void *_talloc_array(const void *ctx, size_t el_size, unsigned count, const char *name)
+{
+ if (count >= MAX_TALLOC_SIZE/el_size) {
+ return NULL;
+ }
+ return _talloc_named_const(ctx, el_size * count, name);
+}
+
+/*
+ alloc an zero array, checking for integer overflow in the array size
+*/
+void *_talloc_zero_array(const void *ctx, size_t el_size, unsigned count, const char *name)
+{
+ if (count >= MAX_TALLOC_SIZE/el_size) {
+ return NULL;
+ }
+ return _talloc_zero(ctx, el_size * count, name);
+}
+
+/*
+ realloc an array, checking for integer overflow in the array size
+*/
+void *_talloc_realloc_array(const void *ctx, void *ptr, size_t el_size, unsigned count, const char *name)
+{
+ if (count >= MAX_TALLOC_SIZE/el_size) {
+ return NULL;
+ }
+ return _talloc_realloc(ctx, ptr, el_size * count, name);
+}
+
+/*
+ a function version of talloc_realloc(), so it can be passed as a function pointer
+ to libraries that want a realloc function (a realloc function encapsulates
+ all the basic capabilities of an allocation library, which is why this is useful)
+*/
+void *talloc_realloc_fn(const void *context, void *ptr, size_t size)
+{
+ return _talloc_realloc(context, ptr, size, NULL);
+}
+
+
+static int talloc_autofree_destructor(void *ptr)
+{
+ autofree_context = NULL;
+ return 0;
+}
+
+static void talloc_autofree(void)
+{
+ _talloc_free(autofree_context);
+}
+
+/*
+ return a context which will be auto-freed on exit
+ this is useful for reducing the noise in leak reports
+*/
+void *talloc_autofree_context(void)
+{
+ if (autofree_context == NULL) {
+ autofree_context = _talloc_named_const(NULL, 0, "autofree_context");
+ talloc_set_destructor(autofree_context, talloc_autofree_destructor);
+ atexit(talloc_autofree);
+ }
+ return autofree_context;
+}
+
+size_t talloc_get_size(const void *context)
+{
+ struct talloc_chunk *tc;
+
+ if (context == NULL)
+ return 0;
+
+ tc = talloc_chunk_from_ptr(context);
+
+ return tc->size;
+}
+
+/*
+ find a parent of this context that has the given name, if any
+*/
+void *talloc_find_parent_byname(const void *context, const char *name)
+{
+ struct talloc_chunk *tc;
+
+ if (context == NULL) {
+ return NULL;
+ }
+
+ tc = talloc_chunk_from_ptr(context);
+ while (tc) {
+ if (tc->name && strcmp(tc->name, name) == 0) {
+ return TC_PTR_FROM_CHUNK(tc);
+ }
+ while (tc && tc->prev) tc = tc->prev;
+ if (tc) {
+ tc = tc->parent;
+ }
+ }
+ return NULL;
+}
+
+/*
+ show the parentage of a context
+*/
+void talloc_show_parents(const void *context, FILE *file)
+{
+ struct talloc_chunk *tc;
+
+ if (context == NULL) {
+ fprintf(file, "talloc no parents for NULL\n");
+ return;
+ }
+
+ tc = talloc_chunk_from_ptr(context);
+ fprintf(file, "talloc parents of '%s'\n", talloc_get_name(context));
+ while (tc) {
+ fprintf(file, "\t'%s'\n", talloc_get_name(TC_PTR_FROM_CHUNK(tc)));
+ while (tc && tc->prev) tc = tc->prev;
+ if (tc) {
+ tc = tc->parent;
+ }
+ }
+ fflush(file);
+}
+
+/*
+ return 1 if ptr is a parent of context
+*/
+int talloc_is_parent(const void *context, const void *ptr)
+{
+ struct talloc_chunk *tc;
+
+ if (context == NULL) {
+ return 0;
+ }
+
+ tc = talloc_chunk_from_ptr(context);
+ while (tc) {
+ if (TC_PTR_FROM_CHUNK(tc) == ptr) return 1;
+ while (tc && tc->prev) tc = tc->prev;
+ if (tc) {
+ tc = tc->parent;
+ }
+ }
+ return 0;
+}