Adding upstream version 2.4.2.upstream/2.4.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1972 insertions, 0 deletions

diff --git a/talloc.h b/talloc.h
new file mode 100644
index 0000000..eef1a70
--- /dev/null
+++ b/talloc.h
@@ -0,0 +1,1972 @@
+#ifndef _TALLOC_H_
+#define _TALLOC_H_
+/*
+   Unix SMB/CIFS implementation.
+   Samba temporary memory allocation functions
+
+   Copyright (C) Andrew Tridgell 2004-2005
+   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/>.
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* for old gcc releases that don't have the feature test macro __has_attribute */
+#ifndef __has_attribute
+#define __has_attribute(x) 0
+#endif
+
+#ifndef _PUBLIC_
+#if __has_attribute(visibility)
+#define _PUBLIC_ __attribute__((visibility("default")))
+#else
+#define _PUBLIC_
+#endif
+#endif
+
+/**
+ * @defgroup talloc The talloc API
+ *
+ * talloc is a hierarchical, reference counted memory pool system with
+ * destructors. It is the core memory allocator used in Samba.
+ *
+ * @{
+ */
+
+#define TALLOC_VERSION_MAJOR 2
+#define TALLOC_VERSION_MINOR 4
+
+_PUBLIC_ int talloc_version_major(void);
+_PUBLIC_ int talloc_version_minor(void);
+/* This is mostly useful only for testing */
+_PUBLIC_ int talloc_test_get_magic(void);
+
+/**
+ * @brief Define a talloc parent type
+ *
+ * As talloc is a hierarchial memory allocator, every talloc chunk is a
+ * potential parent to other talloc chunks. So defining a separate type for a
+ * talloc chunk is not strictly necessary. TALLOC_CTX is defined nevertheless,
+ * as it provides an indicator for function arguments. You will frequently
+ * write code like
+ *
+ * @code
+ *      struct foo *foo_create(TALLOC_CTX *mem_ctx)
+ *      {
+ *              struct foo *result;
+ *              result = talloc(mem_ctx, struct foo);
+ *              if (result == NULL) return NULL;
+ *                      ... initialize foo ...
+ *              return result;
+ *      }
+ * @endcode
+ *
+ * In this type of allocating functions it is handy to have a general
+ * TALLOC_CTX type to indicate which parent to put allocated structures on.
+ */
+typedef void TALLOC_CTX;
+
+/*
+  this uses a little trick to allow __LINE__ to be stringified
+*/
+#ifndef __location__
+#define __TALLOC_STRING_LINE1__(s)    #s
+#define __TALLOC_STRING_LINE2__(s)   __TALLOC_STRING_LINE1__(s)
+#define __TALLOC_STRING_LINE3__  __TALLOC_STRING_LINE2__(__LINE__)
+#define __location__ __FILE__ ":" __TALLOC_STRING_LINE3__
+#endif
+
+#ifndef TALLOC_DEPRECATED
+#define TALLOC_DEPRECATED 0
+#endif
+
+#ifndef PRINTF_ATTRIBUTE
+#if __has_attribute(format) || (__GNUC__ >= 3)
+/** Use gcc attribute to check printf fns.  a1 is the 1-based index of
+ * the parameter containing the format, and a2 the index of the first
+ * argument. Note that some gcc 2.x versions don't handle this
+ * properly **/
+#define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (__printf__, a1, a2)))
+#else
+#define PRINTF_ATTRIBUTE(a1, a2)
+#endif
+#endif
+
+#ifndef _DEPRECATED_
+#if __has_attribute(deprecated) || (__GNUC__ >= 3)
+#define _DEPRECATED_ __attribute__ ((deprecated))
+#else
+#define _DEPRECATED_
+#endif
+#endif
+#ifdef DOXYGEN
+
+/**
+ * @brief Create a new talloc context.
+ *
+ * The talloc() macro is the core of the talloc library. It takes a memory
+ * context and a type, and returns a pointer to a new area of memory of the
+ * given type.
+ *
+ * The returned pointer is itself a talloc context, so you can use it as the
+ * context argument to more calls to talloc if you wish.
+ *
+ * The returned pointer is a "child" of the supplied context. This means that if
+ * you talloc_free() the context then the new child disappears as well.
+ * Alternatively you can free just the child.
+ *
+ * @param[in]  ctx      A talloc context to create a new reference on or NULL to
+ *                      create a new top level context.
+ *
+ * @param[in]  type     The type of memory to allocate.
+ *
+ * @return              A type casted talloc context or NULL on error.
+ *
+ * @code
+ *      unsigned int *a, *b;
+ *
+ *      a = talloc(NULL, unsigned int);
+ *      b = talloc(a, unsigned int);
+ * @endcode
+ *
+ * @see talloc_zero
+ * @see talloc_array
+ * @see talloc_steal
+ * @see talloc_free
+ */
+_PUBLIC_ void *talloc(const void *ctx, #type);
+#else
+#define talloc(ctx, type) (type *)talloc_named_const(ctx, sizeof(type), #type)
+_PUBLIC_ void *_talloc(const void *context, size_t size);
+#endif
+
+/**
+ * @brief Create a new top level talloc context.
+ *
+ * This function creates a zero length named talloc context as a top level
+ * context. It is equivalent to:
+ *
+ * @code
+ *      talloc_named(NULL, 0, fmt, ...);
+ * @endcode
+ * @param[in]  fmt      Format string for the name.
+ *
+ * @param[in]  ...      Additional printf-style arguments.
+ *
+ * @return              The allocated memory chunk, NULL on error.
+ *
+ * @see talloc_named()
+ */
+_PUBLIC_ void *talloc_init(const char *fmt, ...) PRINTF_ATTRIBUTE(1,2);
+
+#ifdef DOXYGEN
+/**
+ * @brief Free a chunk of talloc memory.
+ *
+ * The talloc_free() function frees a piece of talloc memory, and all its
+ * children. You can call talloc_free() on any pointer returned by
+ * talloc().
+ *
+ * The return value of talloc_free() indicates success or failure, with 0
+ * returned for success and -1 for failure. A possible failure condition
+ * is if the pointer had a destructor attached to it and the destructor
+ * returned -1. See talloc_set_destructor() for details on
+ * destructors. Likewise, if "ptr" is NULL, then the function will make
+ * no modifications and return -1.
+ *
+ * From version 2.0 and onwards, as a special case, talloc_free() is
+ * refused on pointers that have more than one parent associated, as talloc
+ * would have no way of knowing which parent should be removed. This is
+ * different from older versions in the sense that always the reference to
+ * the most recently established parent has been destroyed. Hence to free a
+ * pointer that has more than one parent please use talloc_unlink().
+ *
+ * To help you find problems in your code caused by this behaviour, if
+ * you do try and free a pointer with more than one parent then the
+ * talloc logging function will be called to give output like this:
+ *
+ * @code
+ *   ERROR: talloc_free with references at some_dir/source/foo.c:123
+ *     reference at some_dir/source/other.c:325
+ *     reference at some_dir/source/third.c:121
+ * @endcode
+ *
+ * Please see the documentation for talloc_set_log_fn() and
+ * talloc_set_log_stderr() for more information on talloc logging
+ * functions.
+ *
+ * If <code>TALLOC_FREE_FILL</code> environment variable is set,
+ * the memory occupied by the context is filled with the value of this variable.
+ * The value should be a numeric representation of the character you want to
+ * use.
+ *
+ * talloc_free() operates recursively on its children.
+ *
+ * @param[in]  ptr      The chunk to be freed.
+ *
+ * @return              Returns 0 on success and -1 on error. A possible
+ *                      failure condition is if the pointer had a destructor
+ *                      attached to it and the destructor returned -1. Likewise,
+ *                      if "ptr" is NULL, then the function will make no
+ *                      modifications and returns -1.
+ *
+ * Example:
+ * @code
+ *      unsigned int *a, *b;
+ *      a = talloc(NULL, unsigned int);
+ *      b = talloc(a, unsigned int);
+ *
+ *      talloc_free(a); // Frees a and b
+ * @endcode
+ *
+ * @see talloc_set_destructor()
+ * @see talloc_unlink()
+ */
+_PUBLIC_ int talloc_free(void *ptr);
+#else
+#define talloc_free(ctx) _talloc_free(ctx, __location__)
+_PUBLIC_ int _talloc_free(void *ptr, const char *location);
+#endif
+
+/**
+ * @brief Free a talloc chunk's children.
+ *
+ * The function walks along the list of all children of a talloc context and
+ * talloc_free()s only the children, not the context itself.
+ *
+ * A NULL argument is handled as no-op.
+ *
+ * @param[in]  ptr      The chunk that you want to free the children of
+ *                      (NULL is allowed too)
+ */
+_PUBLIC_ void talloc_free_children(void *ptr);
+
+#ifdef DOXYGEN
+/**
+ * @brief Assign a destructor function to be called when a chunk is freed.
+ *
+ * The function talloc_set_destructor() sets the "destructor" for the pointer
+ * "ptr". A destructor is a function that is called when the memory used by a
+ * pointer is about to be released. The destructor receives the pointer as an
+ * argument, and should return 0 for success and -1 for failure.
+ *
+ * The destructor can do anything it wants to, including freeing other pieces
+ * of memory. A common use for destructors is to clean up operating system
+ * resources (such as open file descriptors) contained in the structure the
+ * destructor is placed on.
+ *
+ * You can only place one destructor on a pointer. If you need more than one
+ * destructor then you can create a zero-length child of the pointer and place
+ * an additional destructor on that.
+ *
+ * To remove a destructor call talloc_set_destructor() with NULL for the
+ * destructor.
+ *
+ * If your destructor attempts to talloc_free() the pointer that it is the
+ * destructor for then talloc_free() will return -1 and the free will be
+ * ignored. This would be a pointless operation anyway, as the destructor is
+ * only called when the memory is just about to go away.
+ *
+ * @param[in]  ptr      The talloc chunk to add a destructor to.
+ *
+ * @param[in]  destructor  The destructor function to be called. NULL to remove
+ *                         it.
+ *
+ * Example:
+ * @code
+ *      static int destroy_fd(int *fd) {
+ *              close(*fd);
+ *              return 0;
+ *      }
+ *
+ *      int *open_file(const char *filename) {
+ *              int *fd = talloc(NULL, int);
+ *              *fd = open(filename, O_RDONLY);
+ *              if (*fd < 0) {
+ *                      talloc_free(fd);
+ *                      return NULL;
+ *              }
+ *              // Whenever they free this, we close the file.
+ *              talloc_set_destructor(fd, destroy_fd);
+ *              return fd;
+ *      }
+ * @endcode
+ *
+ * @see talloc()
+ * @see talloc_free()
+ */
+_PUBLIC_ void talloc_set_destructor(const void *ptr, int (*destructor)(void *));
+
+/**
+ * @brief Change a talloc chunk's parent.
+ *
+ * The talloc_steal() function changes the parent context of a talloc
+ * pointer. It is typically used when the context that the pointer is
+ * currently a child of is going to be freed and you wish to keep the
+ * memory for a longer time.
+ *
+ * To make the changed hierarchy less error-prone, you might consider to use
+ * talloc_move().
+ *
+ * If you try and call talloc_steal() on a pointer that has more than one
+ * parent then the result is ambiguous. Talloc will choose to remove the
+ * parent that is currently indicated by talloc_parent() and replace it with
+ * the chosen parent. You will also get a message like this via the talloc
+ * logging functions:
+ *
+ * @code
+ *   WARNING: talloc_steal with references at some_dir/source/foo.c:123
+ *     reference at some_dir/source/other.c:325
+ *     reference at some_dir/source/third.c:121
+ * @endcode
+ *
+ * To unambiguously change the parent of a pointer please see the function
+ * talloc_reparent(). See the talloc_set_log_fn() documentation for more
+ * information on talloc logging.
+ *
+ * @param[in]  new_ctx  The new parent context.
+ *
+ * @param[in]  ptr      The talloc chunk to move.
+ *
+ * @return              Returns the pointer that you pass it. It does not have
+ *                      any failure modes.
+ *
+ * @note It is possible to produce loops in the parent/child relationship
+ * if you are not careful with talloc_steal(). No guarantees are provided
+ * as to your sanity or the safety of your data if you do this.
+ */
+_PUBLIC_ void *talloc_steal(const void *new_ctx, const void *ptr);
+#else /* DOXYGEN */
+/* try to make talloc_set_destructor() and talloc_steal() type safe,
+   if we have a recent gcc */
+#if (__GNUC__ >= 3)
+#define _TALLOC_TYPEOF(ptr) __typeof__(ptr)
+#define talloc_set_destructor(ptr, function)				      \
+	do {								      \
+		int (*_talloc_destructor_fn)(_TALLOC_TYPEOF(ptr)) = (function);	      \
+		_talloc_set_destructor((ptr), (int (*)(void *))_talloc_destructor_fn); \
+	} while(0)
+/* this extremely strange macro is to avoid some braindamaged warning
+   stupidity in gcc 4.1.x */
+#define talloc_steal(ctx, ptr) ({ _TALLOC_TYPEOF(ptr) __talloc_steal_ret = (_TALLOC_TYPEOF(ptr))_talloc_steal_loc((ctx),(ptr), __location__); __talloc_steal_ret; })
+#else /* __GNUC__ >= 3 */
+#define talloc_set_destructor(ptr, function) \
+	_talloc_set_destructor((ptr), (int (*)(void *))(function))
+#define _TALLOC_TYPEOF(ptr) void *
+#define talloc_steal(ctx, ptr) (_TALLOC_TYPEOF(ptr))_talloc_steal_loc((ctx),(ptr), __location__)
+#endif /* __GNUC__ >= 3 */
+_PUBLIC_ void _talloc_set_destructor(const void *ptr, int (*_destructor)(void *));
+_PUBLIC_ void *_talloc_steal_loc(const void *new_ctx, const void *ptr, const char *location);
+#endif /* DOXYGEN */
+
+/**
+ * @brief Assign a name to a talloc chunk.
+ *
+ * Each talloc pointer has a "name". The name is used principally for
+ * debugging purposes, although it is also possible to set and get the name on
+ * a pointer in as a way of "marking" pointers in your code.
+ *
+ * The main use for names on pointer is for "talloc reports". See
+ * talloc_report() and talloc_report_full() for details. Also see
+ * talloc_enable_leak_report() and talloc_enable_leak_report_full().
+ *
+ * The talloc_set_name() function allocates memory as a child of the
+ * pointer. It is logically equivalent to:
+ *
+ * @code
+ *      talloc_set_name_const(ptr, talloc_asprintf(ptr, fmt, ...));
+ * @endcode
+ *
+ * @param[in]  ptr      The talloc chunk to assign a name to.
+ *
+ * @param[in]  fmt      Format string for the name.
+ *
+ * @param[in]  ...      Add printf-style additional arguments.
+ *
+ * @return              The assigned name, NULL on error.
+ *
+ * @note Multiple calls to talloc_set_name() will allocate more memory without
+ * releasing the name. All of the memory is released when the ptr is freed
+ * using talloc_free().
+ */
+_PUBLIC_ const char *talloc_set_name(const void *ptr, const char *fmt, ...) PRINTF_ATTRIBUTE(2,3);
+
+#ifdef DOXYGEN
+/**
+ * @brief Change a talloc chunk's parent.
+ *
+ * This function has the same effect as talloc_steal(), and additionally sets
+ * the source pointer to NULL. You would use it like this:
+ *
+ * @code
+ *      struct foo *X = talloc(tmp_ctx, struct foo);
+ *      struct foo *Y;
+ *      Y = talloc_move(new_ctx, &X);
+ * @endcode
+ *
+ * @param[in]  new_ctx  The new parent context.
+ *
+ * @param[in]  pptr     Pointer to a pointer to the talloc chunk to move.
+ *
+ * @return              The pointer to the talloc chunk that moved.
+ *                      It does not have any failure modes.
+ *
+ */
+_PUBLIC_ void *talloc_move(const void *new_ctx, void **pptr);
+#else
+#define talloc_move(ctx, pptr) (_TALLOC_TYPEOF(*(pptr)))_talloc_move((ctx),(void *)(pptr))
+_PUBLIC_ void *_talloc_move(const void *new_ctx, const void *pptr);
+#endif
+
+/**
+ * @brief Assign a name to a talloc chunk.
+ *
+ * The function is just like talloc_set_name(), but it takes a string constant,
+ * and is much faster. It is extensively used by the "auto naming" macros, such
+ * as talloc_p().
+ *
+ * This function does not allocate any memory. It just copies the supplied
+ * pointer into the internal representation of the talloc ptr. This means you
+ * must not pass a name pointer to memory that will disappear before the ptr
+ * is freed with talloc_free().
+ *
+ * @param[in]  ptr      The talloc chunk to assign a name to.
+ *
+ * @param[in]  name     Format string for the name.
+ */
+_PUBLIC_ void talloc_set_name_const(const void *ptr, const char *name);
+
+/**
+ * @brief Create a named talloc chunk.
+ *
+ * The talloc_named() function creates a named talloc pointer. It is
+ * equivalent to:
+ *
+ * @code
+ *      ptr = talloc_size(context, size);
+ *      talloc_set_name(ptr, fmt, ....);
+ * @endcode
+ *
+ * @param[in]  context  The talloc context to hang the result off.
+ *
+ * @param[in]  size     Number of char's that you want to allocate.
+ *
+ * @param[in]  fmt      Format string for the name.
+ *
+ * @param[in]  ...      Additional printf-style arguments.
+ *
+ * @return              The allocated memory chunk, NULL on error.
+ *
+ * @see talloc_set_name()
+ */
+_PUBLIC_ void *talloc_named(const void *context, size_t size,
+		   const char *fmt, ...) PRINTF_ATTRIBUTE(3,4);
+
+/**
+ * @brief Basic routine to allocate a chunk of memory.
+ *
+ * This is equivalent to:
+ *
+ * @code
+ *      ptr = talloc_size(context, size);
+ *      talloc_set_name_const(ptr, name);
+ * @endcode
+ *
+ * @param[in]  context  The parent context.
+ *
+ * @param[in]  size     The number of char's that we want to allocate.
+ *
+ * @param[in]  name     The name the talloc block has.
+ *
+ * @return             The allocated memory chunk, NULL on error.
+ */
+_PUBLIC_ void *talloc_named_const(const void *context, size_t size, const char *name);
+
+#ifdef DOXYGEN
+/**
+ * @brief Untyped allocation.
+ *
+ * The function should be used when you don't have a convenient type to pass to
+ * talloc(). Unlike talloc(), it is not type safe (as it returns a void *), so
+ * you are on your own for type checking.
+ *
+ * Best to use talloc() or talloc_array() instead.
+ *
+ * @param[in]  ctx     The talloc context to hang the result off.
+ *
+ * @param[in]  size    Number of char's that you want to allocate.
+ *
+ * @return             The allocated memory chunk, NULL on error.
+ *
+ * Example:
+ * @code
+ *      void *mem = talloc_size(NULL, 100);
+ * @endcode
+ */
+_PUBLIC_ void *talloc_size(const void *ctx, size_t size);
+#else
+#define talloc_size(ctx, size) talloc_named_const(ctx, size, __location__)
+#endif
+
+#ifdef DOXYGEN
+/**
+ * @brief Allocate into a typed pointer.
+ *
+ * The talloc_ptrtype() macro should be used when you have a pointer and want
+ * to allocate memory to point at with this pointer. When compiling with
+ * gcc >= 3 it is typesafe. Note this is a wrapper of talloc_size() and
+ * talloc_get_name() will return the current location in the source file and
+ * not the type.
+ *
+ * @param[in]  ctx      The talloc context to hang the result off.
+ *
+ * @param[in]  type     The pointer you want to assign the result to.
+ *
+ * @return              The properly casted allocated memory chunk, NULL on
+ *                      error.
+ *
+ * Example:
+ * @code
+ *       unsigned int *a = talloc_ptrtype(NULL, a);
+ * @endcode
+ */
+_PUBLIC_ void *talloc_ptrtype(const void *ctx, #type);
+#else
+#define talloc_ptrtype(ctx, ptr) (_TALLOC_TYPEOF(ptr))talloc_size(ctx, sizeof(*(ptr)))
+#endif
+
+#ifdef DOXYGEN
+/**
+ * @brief Allocate a new 0-sized talloc chunk.
+ *
+ * This is a utility macro that creates a new memory context hanging off an
+ * existing context, automatically naming it "talloc_new: __location__" where
+ * __location__ is the source line it is called from. It is particularly
+ * useful for creating a new temporary working context.
+ *
+ * @param[in]  ctx      The talloc parent context.
+ *
+ * @return              A new talloc chunk, NULL on error.
+ */
+_PUBLIC_ void *talloc_new(const void *ctx);
+#else
+#define talloc_new(ctx) talloc_named_const(ctx, 0, "talloc_new: " __location__)
+#endif
+
+#ifdef DOXYGEN
+/**
+ * @brief Allocate a 0-initizialized structure.
+ *
+ * The macro is equivalent to:
+ *
+ * @code
+ *      ptr = talloc(ctx, type);
+ *      if (ptr) memset(ptr, 0, sizeof(type));
+ * @endcode
+ *
+ * @param[in]  ctx      The talloc context to hang the result off.
+ *
+ * @param[in]  type     The type that we want to allocate.
+ *
+ * @return              Pointer to a piece of memory, properly cast to 'type *',
+ *                      NULL on error.
+ *
+ * Example:
+ * @code
+ *      unsigned int *a, *b;
+ *      a = talloc_zero(NULL, unsigned int);
+ *      b = talloc_zero(a, unsigned int);
+ * @endcode
+ *
+ * @see talloc()
+ * @see talloc_zero_size()
+ * @see talloc_zero_array()
+ */
+_PUBLIC_ void *talloc_zero(const void *ctx, #type);
+
+/**
+ * @brief Allocate untyped, 0-initialized memory.
+ *
+ * @param[in]  ctx      The talloc context to hang the result off.
+ *
+ * @param[in]  size     Number of char's that you want to allocate.
+ *
+ * @return              The allocated memory chunk.
+ */
+_PUBLIC_ void *talloc_zero_size(const void *ctx, size_t size);
+#else
+#define talloc_zero(ctx, type) (type *)_talloc_zero(ctx, sizeof(type), #type)
+#define talloc_zero_size(ctx, size) _talloc_zero(ctx, size, __location__)
+_PUBLIC_ void *_talloc_zero(const void *ctx, size_t size, const char *name);
+#endif
+
+/**
+ * @brief Return the name of a talloc chunk.
+ *
+ * @param[in]  ptr      The talloc chunk.
+ *
+ * @return              The current name for the given talloc pointer.
+ *
+ * @see talloc_set_name()
+ */
+_PUBLIC_ const char *talloc_get_name(const void *ptr);
+
+/**
+ * @brief Verify that a talloc chunk carries a specified name.
+ *
+ * This function checks if a pointer has the specified name. If it does
+ * then the pointer is returned.
+ *
+ * @param[in]  ptr       The talloc chunk to check.
+ *
+ * @param[in]  name      The name to check against.
+ *
+ * @return               The pointer if the name matches, NULL if it doesn't.
+ */
+_PUBLIC_ void *talloc_check_name(const void *ptr, const char *name);
+
+/**
+ * @brief Get the parent chunk of a pointer.
+ *
+ * @param[in]  ptr      The talloc pointer to inspect.
+ *
+ * @return              The talloc parent of ptr, NULL on error.
+ */
+_PUBLIC_ void *talloc_parent(const void *ptr);
+
+/**
+ * @brief Get a talloc chunk's parent name.
+ *
+ * @param[in]  ptr      The talloc pointer to inspect.
+ *
+ * @return              The name of ptr's parent chunk.
+ */
+_PUBLIC_ const char *talloc_parent_name(const void *ptr);
+
+/**
+ * @brief Get the size of a talloc chunk.
+ *
+ * This function lets you know the amount of memory allocated so far by
+ * this context. It does NOT account for subcontext memory.
+ * This can be used to calculate the size of an array.
+ *
+ * @param[in]  ctx      The talloc chunk.
+ *
+ * @return              The size of the talloc chunk.
+ */
+_PUBLIC_ size_t talloc_get_size(const void *ctx);
+
+/**
+ * @brief Get the total size of a talloc chunk including its children.
+ *
+ * The function returns the total size in bytes used by this pointer and all
+ * child pointers. Mostly useful for debugging.
+ *
+ * Passing NULL is allowed, but it will only give a meaningful result if
+ * talloc_enable_leak_report() or talloc_enable_leak_report_full() has
+ * been called.
+ *
+ * @param[in]  ptr      The talloc chunk.
+ *
+ * @return              The total size.
+ */
+_PUBLIC_ size_t talloc_total_size(const void *ptr);
+
+/**
+ * @brief Get the number of talloc chunks hanging off a chunk.
+ *
+ * The talloc_total_blocks() function returns the total memory block
+ * count used by this pointer and all child pointers. Mostly useful for
+ * debugging.
+ *
+ * Passing NULL is allowed, but it will only give a meaningful result if
+ * talloc_enable_leak_report() or talloc_enable_leak_report_full() has
+ * been called.
+ *
+ * @param[in]  ptr      The talloc chunk.
+ *
+ * @return              The total size.
+ */
+_PUBLIC_ size_t talloc_total_blocks(const void *ptr);
+
+#ifdef DOXYGEN
+/**
+ * @brief Duplicate a memory area into a talloc chunk.
+ *
+ * The function is equivalent to:
+ *
+ * @code
+ *      ptr = talloc_size(ctx, size);
+ *      if (ptr) memcpy(ptr, p, size);
+ * @endcode
+ *
+ * @param[in]  t        The talloc context to hang the result off.
+ *
+ * @param[in]  p        The memory chunk you want to duplicate.
+ *
+ * @param[in]  size     Number of chars that you want to copy.
+ *
+ * @return              The allocated memory chunk.
+ *
+ * @see talloc_size()
+ */
+_PUBLIC_ void *talloc_memdup(const void *t, const void *p, size_t size);
+#else
+#define talloc_memdup(t, p, size) _talloc_memdup(t, p, size, __location__)
+_PUBLIC_ void *_talloc_memdup(const void *t, const void *p, size_t size, const char *name);
+#endif
+
+#ifdef DOXYGEN
+/**
+ * @brief Assign a type to a talloc chunk.
+ *
+ * This macro allows you to force the name of a pointer to be of a particular
+ * type. This can be used in conjunction with talloc_get_type() to do type
+ * checking on void* pointers.
+ *
+ * It is equivalent to this:
+ *
+ * @code
+ *      talloc_set_name_const(ptr, #type)
+ * @endcode
+ *
+ * @param[in]  ptr      The talloc chunk to assign the type to.
+ *
+ * @param[in]  type     The type to assign.
+ */
+_PUBLIC_ void talloc_set_type(const char *ptr, #type);
+
+/**
+ * @brief Get a typed pointer out of a talloc pointer.
+ *
+ * This macro allows you to do type checking on talloc pointers. It is
+ * particularly useful for void* private pointers. It is equivalent to
+ * this:
+ *
+ * @code
+ *      (type *)talloc_check_name(ptr, #type)
+ * @endcode
+ *
+ * @param[in]  ptr      The talloc pointer to check.
+ *
+ * @param[in]  type     The type to check against.
+ *
+ * @return              The properly casted pointer given by ptr, NULL on error.
+ */
+type *talloc_get_type(const void *ptr, #type);
+#else
+#define talloc_set_type(ptr, type) talloc_set_name_const(ptr, #type)
+#define talloc_get_type(ptr, type) (type *)talloc_check_name(ptr, #type)
+#endif
+
+#ifdef DOXYGEN
+/**
+ * @brief Safely turn a void pointer into a typed pointer.
+ *
+ * This macro is used together with talloc(mem_ctx, struct foo). If you had to
+ * assign the talloc chunk pointer to some void pointer variable,
+ * talloc_get_type_abort() is the recommended way to convert the void
+ * pointer back to a typed pointer.
+ *
+ * @param[in]  ptr      The void pointer to convert.
+ *
+ * @param[in]  type     The type that this chunk contains
+ *
+ * @return              The same value as ptr, type-checked and properly cast.
+ */
+_PUBLIC_ void *talloc_get_type_abort(const void *ptr, #type);
+#else
+#ifdef TALLOC_GET_TYPE_ABORT_NOOP
+#define talloc_get_type_abort(ptr, type) (type *)(ptr)
+#else
+#define talloc_get_type_abort(ptr, type) (type *)_talloc_get_type_abort(ptr, #type, __location__)
+#endif
+_PUBLIC_ void *_talloc_get_type_abort(const void *ptr, const char *name, const char *location);
+#endif
+
+/**
+ * @brief Find a parent context by name.
+ *
+ * Find a parent memory context of the current context that has the given
+ * name. This can be very useful in complex programs where it may be
+ * difficult to pass all information down to the level you need, but you
+ * know the structure you want is a parent of another context.
+ *
+ * @param[in]  ctx      The talloc chunk to start from.
+ *
+ * @param[in]  name     The name of the parent we look for.
+ *
+ * @return              The memory context we are looking for, NULL if not
+ *                      found.
+ */
+_PUBLIC_ void *talloc_find_parent_byname(const void *ctx, const char *name);
+
+#ifdef DOXYGEN
+/**
+ * @brief Find a parent context by type.
+ *
+ * Find a parent memory context of the current context that has the given
+ * name. This can be very useful in complex programs where it may be
+ * difficult to pass all information down to the level you need, but you
+ * know the structure you want is a parent of another context.
+ *
+ * Like talloc_find_parent_byname() but takes a type, making it typesafe.
+ *
+ * @param[in]  ptr      The talloc chunk to start from.
+ *
+ * @param[in]  type     The type of the parent to look for.
+ *
+ * @return              The memory context we are looking for, NULL if not
+ *                      found.
+ */
+_PUBLIC_ void *talloc_find_parent_bytype(const void *ptr, #type);
+#else
+#define talloc_find_parent_bytype(ptr, type) (type *)talloc_find_parent_byname(ptr, #type)
+#endif
+
+/**
+ * @brief Allocate a talloc pool.
+ *
+ * A talloc pool is a pure optimization for specific situations. In the
+ * release process for Samba 3.2 we found out that we had become considerably
+ * slower than Samba 3.0 was. Profiling showed that malloc(3) was a large CPU
+ * consumer in benchmarks. For Samba 3.2 we have internally converted many
+ * static buffers to dynamically allocated ones, so malloc(3) being beaten
+ * more was no surprise. But it made us slower.
+ *
+ * talloc_pool() is an optimization to call malloc(3) a lot less for the use
+ * pattern Samba has: The SMB protocol is mainly a request/response protocol
+ * where we have to allocate a certain amount of memory per request and free
+ * that after the SMB reply is sent to the client.
+ *
+ * talloc_pool() creates a talloc chunk that you can use as a talloc parent
+ * exactly as you would use any other ::TALLOC_CTX. The difference is that
+ * when you talloc a child of this pool, no malloc(3) is done. Instead, talloc
+ * just increments a pointer inside the talloc_pool. This also works
+ * recursively. If you use the child of the talloc pool as a parent for
+ * grand-children, their memory is also taken from the talloc pool.
+ *
+ * If there is not enough memory in the pool to allocate the new child,
+ * it will create a new talloc chunk as if the parent was a normal talloc
+ * context.
+ *
+ * If you talloc_free() children of a talloc pool, the memory is not given
+ * back to the system. Instead, free(3) is only called if the talloc_pool()
+ * itself is released with talloc_free().
+ *
+ * The downside of a talloc pool is that if you talloc_move() a child of a
+ * talloc pool to a talloc parent outside the pool, the whole pool memory is
+ * not free(3)'ed until that moved chunk is also talloc_free()ed.
+ *
+ * @param[in]  context  The talloc context to hang the result off.
+ *
+ * @param[in]  size     Size of the talloc pool.
+ *
+ * @return              The allocated talloc pool, NULL on error.
+ */
+_PUBLIC_ void *talloc_pool(const void *context, size_t size);
+
+#ifdef DOXYGEN
+/**
+ * @brief Allocate a talloc object as/with an additional pool.
+ *
+ * This is like talloc_pool(), but's it's more flexible
+ * and allows an object to be a pool for its children.
+ *
+ * @param[in] ctx                   The talloc context to hang the result off.
+ *
+ * @param[in] type                  The type that we want to allocate.
+ *
+ * @param[in] num_subobjects        The expected number of subobjects, which will
+ *                                  be allocated within the pool. This allocates
+ *                                  space for talloc_chunk headers.
+ *
+ * @param[in] total_subobjects_size The size that all subobjects can use in total.
+ *
+ *
+ * @return              The allocated talloc object, NULL on error.
+ */
+_PUBLIC_ void *talloc_pooled_object(const void *ctx, #type,
+			   unsigned num_subobjects,
+			   size_t total_subobjects_size);
+#else
+#define talloc_pooled_object(_ctx, _type, \
+			     _num_subobjects, \
+			     _total_subobjects_size) \
+	(_type *)_talloc_pooled_object((_ctx), sizeof(_type), #_type, \
+					(_num_subobjects), \
+					(_total_subobjects_size))
+_PUBLIC_ void *_talloc_pooled_object(const void *ctx,
+			    size_t type_size,
+			    const char *type_name,
+			    unsigned num_subobjects,
+			    size_t total_subobjects_size);
+#endif
+
+/**
+ * @brief Free a talloc chunk and NULL out the pointer.
+ *
+ * TALLOC_FREE() frees a pointer and sets it to NULL. Use this if you want
+ * immediate feedback (i.e. crash) if you use a pointer after having free'ed
+ * it.
+ *
+ * @param[in]  ctx      The chunk to be freed.
+ */
+#define TALLOC_FREE(ctx) do { if (ctx != NULL) { talloc_free(ctx); ctx=NULL; } } while(0)
+
+/* @} ******************************************************************/
+
+/**
+ * \defgroup talloc_ref The talloc reference function.
+ * @ingroup talloc
+ *
+ * This module contains the definitions around talloc references
+ *
+ * @{
+ */
+
+/**
+ * @brief Increase the reference count of a talloc chunk.
+ *
+ * The talloc_increase_ref_count(ptr) function is exactly equivalent to:
+ *
+ * @code
+ *      talloc_reference(NULL, ptr);
+ * @endcode
+ *
+ * You can use either syntax, depending on which you think is clearer in
+ * your code.
+ *
+ * @param[in]  ptr      The pointer to increase the reference count.
+ *
+ * @return              0 on success, -1 on error.
+ */
+_PUBLIC_ int talloc_increase_ref_count(const void *ptr);
+
+/**
+ * @brief Get the number of references to a talloc chunk.
+ *
+ * @param[in]  ptr      The pointer to retrieve the reference count from.
+ *
+ * @return              The number of references.
+ */
+_PUBLIC_ size_t talloc_reference_count(const void *ptr);
+
+#ifdef DOXYGEN
+/**
+ * @brief Create an additional talloc parent to a pointer.
+ *
+ * The talloc_reference() function makes "context" an additional parent of
+ * ptr. Each additional reference consumes around 48 bytes of memory on intel
+ * x86 platforms.
+ *
+ * If ptr is NULL, then the function is a no-op, and simply returns NULL.
+ *
+ * After creating a reference you can free it in one of the following ways:
+ *
+ * - you can talloc_free() any parent of the original pointer. That
+ *   will reduce the number of parents of this pointer by 1, and will
+ *   cause this pointer to be freed if it runs out of parents.
+ *
+ * - you can talloc_free() the pointer itself if it has at maximum one
+ *   parent. This behaviour has been changed since the release of version
+ *   2.0. Further information in the description of "talloc_free".
+ *
+ * For more control on which parent to remove, see talloc_unlink()
+ * @param[in]  ctx      The additional parent.
+ *
+ * @param[in]  ptr      The pointer you want to create an additional parent for.
+ *
+ * @return              The original pointer 'ptr', NULL if talloc ran out of
+ *                      memory in creating the reference.
+ *
+ * @warning You should try to avoid using this interface. It turns a beautiful
+ *          talloc-tree into a graph. It is often really hard to debug if you
+ *          screw something up by accident.
+ *
+ * Example:
+ * @code
+ *      unsigned int *a, *b, *c;
+ *      a = talloc(NULL, unsigned int);
+ *      b = talloc(NULL, unsigned int);
+ *      c = talloc(a, unsigned int);
+ *      // b also serves as a parent of c.
+ *      talloc_reference(b, c);
+ * @endcode
+ *
+ * @see talloc_unlink()
+ */
+_PUBLIC_ void *talloc_reference(const void *ctx, const void *ptr);
+#else
+#define talloc_reference(ctx, ptr) (_TALLOC_TYPEOF(ptr))_talloc_reference_loc((ctx),(ptr), __location__)
+_PUBLIC_ void *_talloc_reference_loc(const void *context, const void *ptr, const char *location);
+#endif
+
+/**
+ * @brief Remove a specific parent from a talloc chunk.
+ *
+ * The function removes a specific parent from ptr. The context passed must
+ * either be a context used in talloc_reference() with this pointer, or must be
+ * a direct parent of ptr.
+ *
+ * You can just use talloc_free() instead of talloc_unlink() if there
+ * is at maximum one parent. This behaviour has been changed since the
+ * release of version 2.0. Further information in the description of
+ * "talloc_free".
+ *
+ * @param[in]  context  The talloc parent to remove.
+ *
+ * @param[in]  ptr      The talloc ptr you want to remove the parent from.
+ *
+ * @return              0 on success, -1 on error.
+ *
+ * @note If the parent has already been removed using talloc_free() then
+ * this function will fail and will return -1.  Likewise, if ptr is NULL,
+ * then the function will make no modifications and return -1.
+ *
+ * @warning You should try to avoid using this interface. It turns a beautiful
+ *          talloc-tree into a graph. It is often really hard to debug if you
+ *          screw something up by accident.
+ *
+ * Example:
+ * @code
+ *      unsigned int *a, *b, *c;
+ *      a = talloc(NULL, unsigned int);
+ *      b = talloc(NULL, unsigned int);
+ *      c = talloc(a, unsigned int);
+ *      // b also serves as a parent of c.
+ *      talloc_reference(b, c);
+ *      talloc_unlink(b, c);
+ * @endcode
+ */
+_PUBLIC_ int talloc_unlink(const void *context, void *ptr);
+
+/**
+ * @brief Provide a talloc context that is freed at program exit.
+ *
+ * This is a handy utility function that returns a talloc context
+ * which will be automatically freed on program exit. This can be used
+ * to reduce the noise in memory leak reports.
+ *
+ * Never use this in code that might be used in objects loaded with
+ * dlopen and unloaded with dlclose. talloc_autofree_context()
+ * internally uses atexit(3). Some platforms like modern Linux handles
+ * this fine, but for example FreeBSD does not deal well with dlopen()
+ * and atexit() used simultaneously: dlclose() does not clean up the
+ * list of atexit-handlers, so when the program exits the code that
+ * was registered from within talloc_autofree_context() is gone, the
+ * program crashes at exit.
+ *
+ * @return              A talloc context, NULL on error.
+ */
+_PUBLIC_ void *talloc_autofree_context(void) _DEPRECATED_;
+
+/**
+ * @brief Show the parentage of a context.
+ *
+ * @param[in]  context            The talloc context to look at.
+ *
+ * @param[in]  file               The output to use, a file, stdout or stderr.
+ */
+_PUBLIC_ void talloc_show_parents(const void *context, FILE *file);
+
+/**
+ * @brief Check if a context is parent of a talloc chunk.
+ *
+ * This checks if context is referenced in the talloc hierarchy above ptr.
+ *
+ * @param[in]  context  The assumed talloc context.
+ *
+ * @param[in]  ptr      The talloc chunk to check.
+ *
+ * @return              Return 1 if this is the case, 0 if not.
+ */
+_PUBLIC_ int talloc_is_parent(const void *context, const void *ptr);
+
+/**
+ * @brief Change the parent context of a talloc pointer.
+ *
+ * The function changes the parent context of a talloc pointer. It is typically
+ * used when the context that the pointer is currently a child of is going to be
+ * freed and you wish to keep the memory for a longer time.
+ *
+ * The difference between talloc_reparent() and talloc_steal() is that
+ * talloc_reparent() can specify which parent you wish to change. This is
+ * useful when a pointer has multiple parents via references.
+ *
+ * @param[in]  old_parent
+ * @param[in]  new_parent
+ * @param[in]  ptr
+ *
+ * @return              Return the pointer you passed. It does not have any
+ *                      failure modes.
+ */
+_PUBLIC_ void *talloc_reparent(const void *old_parent, const void *new_parent, const void *ptr);
+
+/* @} ******************************************************************/
+
+/**
+ * @defgroup talloc_array The talloc array functions
+ * @ingroup talloc
+ *
+ * Talloc contains some handy helpers for handling Arrays conveniently
+ *
+ * @{
+ */
+
+#ifdef DOXYGEN
+/**
+ * @brief Allocate an array.
+ *
+ * The macro is equivalent to:
+ *
+ * @code
+ *      (type *)talloc_size(ctx, sizeof(type) * count);
+ * @endcode
+ *
+ * except that it provides integer overflow protection for the multiply,
+ * returning NULL if the multiply overflows.
+ *
+ * @param[in]  ctx      The talloc context to hang the result off.
+ *
+ * @param[in]  type     The type that we want to allocate.
+ *
+ * @param[in]  count    The number of 'type' elements you want to allocate.
+ *
+ * @return              The allocated result, properly cast to 'type *', NULL on
+ *                      error.
+ *
+ * Example:
+ * @code
+ *      unsigned int *a, *b;
+ *      a = talloc_zero(NULL, unsigned int);
+ *      b = talloc_array(a, unsigned int, 100);
+ * @endcode
+ *
+ * @see talloc()
+ * @see talloc_zero_array()
+ */
+_PUBLIC_ void *talloc_array(const void *ctx, #type, unsigned count);
+#else
+#define talloc_array(ctx, type, count) (type *)_talloc_array(ctx, sizeof(type), count, #type)
+_PUBLIC_ void *_talloc_array(const void *ctx, size_t el_size, unsigned count, const char *name);
+#endif
+
+#ifdef DOXYGEN
+/**
+ * @brief Allocate an array.
+ *
+ * @param[in]  ctx      The talloc context to hang the result off.
+ *
+ * @param[in]  size     The size of an array element.
+ *
+ * @param[in]  count    The number of elements you want to allocate.
+ *
+ * @return              The allocated result, NULL on error.
+ */
+_PUBLIC_ void *talloc_array_size(const void *ctx, size_t size, unsigned count);
+#else
+#define talloc_array_size(ctx, size, count) _talloc_array(ctx, size, count, __location__)
+#endif
+
+#ifdef DOXYGEN
+/**
+ * @brief Allocate an array into a typed pointer.
+ *
+ * The macro should be used when you have a pointer to an array and want to
+ * allocate memory of an array to point at with this pointer. When compiling
+ * with gcc >= 3 it is typesafe. Note this is a wrapper of talloc_array_size()
+ * and talloc_get_name() will return the current location in the source file
+ * and not the type.
+ *
+ * @param[in]  ctx      The talloc context to hang the result off.
+ *
+ * @param[in]  ptr      The pointer you want to assign the result to.
+ *
+ * @param[in]  count    The number of elements you want to allocate.
+ *
+ * @return              The allocated memory chunk, properly casted. NULL on
+ *                      error.
+ */
+void *talloc_array_ptrtype(const void *ctx, const void *ptr, unsigned count);
+#else
+#define talloc_array_ptrtype(ctx, ptr, count) (_TALLOC_TYPEOF(ptr))talloc_array_size(ctx, sizeof(*(ptr)), count)
+#endif
+
+#ifdef DOXYGEN
+/**
+ * @brief Get the number of elements in a talloc'ed array.
+ *
+ * A talloc chunk carries its own size, so for talloc'ed arrays it is not
+ * necessary to store the number of elements explicitly.
+ *
+ * @param[in]  ctx      The allocated array.
+ *
+ * @return              The number of elements in ctx.
+ */
+size_t talloc_array_length(const void *ctx);
+#else
+#define talloc_array_length(ctx) (talloc_get_size(ctx)/sizeof(*ctx))
+#endif
+
+#ifdef DOXYGEN
+/**
+ * @brief Allocate a zero-initialized array
+ *
+ * @param[in]  ctx      The talloc context to hang the result off.
+ *
+ * @param[in]  type     The type that we want to allocate.
+ *
+ * @param[in]  count    The number of "type" elements you want to allocate.
+ *
+ * @return              The allocated result casted to "type *", NULL on error.
+ *
+ * The talloc_zero_array() macro is equivalent to:
+ *
+ * @code
+ *     ptr = talloc_array(ctx, type, count);
+ *     if (ptr) memset(ptr, 0, sizeof(type) * count);
+ * @endcode
+ */
+void *talloc_zero_array(const void *ctx, #type, unsigned count);
+#else
+#define talloc_zero_array(ctx, type, count) (type *)_talloc_zero_array(ctx, sizeof(type), count, #type)
+_PUBLIC_ void *_talloc_zero_array(const void *ctx,
+			 size_t el_size,
+			 unsigned count,
+			 const char *name);
+#endif
+
+#ifdef DOXYGEN
+/**
+ * @brief Change the size of a talloc array.
+ *
+ * The macro changes the size of a talloc pointer. The 'count' argument is the
+ * number of elements of type 'type' that you want the resulting pointer to
+ * hold.
+ *
+ * talloc_realloc() has the following equivalences:
+ *
+ * @code
+ *      talloc_realloc(ctx, NULL, type, 1) ==> talloc(ctx, type);
+ *      talloc_realloc(ctx, NULL, type, N) ==> talloc_array(ctx, type, N);
+ *      talloc_realloc(ctx, ptr, type, 0)  ==> talloc_free(ptr);
+ * @endcode
+ *
+ * The "context" argument is only used if "ptr" is NULL, otherwise it is
+ * ignored.
+ *
+ * @param[in]  ctx      The parent context used if ptr is NULL.
+ *
+ * @param[in]  ptr      The chunk to be resized.
+ *
+ * @param[in]  type     The type of the array element inside ptr.
+ *
+ * @param[in]  count    The intended number of array elements.
+ *
+ * @return              The new array, NULL on error. The call will fail either
+ *                      due to a lack of memory, or because the pointer has more
+ *                      than one parent (see talloc_reference()).
+ */
+_PUBLIC_ void *talloc_realloc(const void *ctx, void *ptr, #type, size_t count);
+#else
+#define talloc_realloc(ctx, p, type, count) (type *)_talloc_realloc_array(ctx, p, sizeof(type), count, #type)
+_PUBLIC_ void *_talloc_realloc_array(const void *ctx, void *ptr, size_t el_size, unsigned count, const char *name);
+#endif
+
+#ifdef DOXYGEN
+/**
+ * @brief Untyped realloc to change the size of a talloc array.
+ *
+ * The macro is useful when the type is not known so the typesafe
+ * talloc_realloc() cannot be used.
+ *
+ * @param[in]  ctx      The parent context used if 'ptr' is NULL.
+ *
+ * @param[in]  ptr      The chunk to be resized.
+ *
+ * @param[in]  size     The new chunk size.
+ *
+ * @return              The new array, NULL on error.
+ */
+void *talloc_realloc_size(const void *ctx, void *ptr, size_t size);
+#else
+#define talloc_realloc_size(ctx, ptr, size) _talloc_realloc(ctx, ptr, size, __location__)
+_PUBLIC_ void *_talloc_realloc(const void *context, void *ptr, size_t size, const char *name);
+#endif
+
+/**
+ * @brief Provide a function version of talloc_realloc_size.
+ *
+ * This is a non-macro version of talloc_realloc(), which is useful as
+ * libraries sometimes want a ralloc function pointer. A realloc()
+ * implementation encapsulates the functionality of malloc(), free() and
+ * realloc() in one call, which is why it is useful to be able to pass around
+ * a single function pointer.
+ *
+ * @param[in]  context  The parent context used if ptr is NULL.
+ *
+ * @param[in]  ptr      The chunk to be resized.
+ *
+ * @param[in]  size     The new chunk size.
+ *
+ * @return              The new chunk, NULL on error.
+ */
+_PUBLIC_ void *talloc_realloc_fn(const void *context, void *ptr, size_t size);
+
+/* @} ******************************************************************/
+
+/**
+ * @defgroup talloc_string The talloc string functions.
+ * @ingroup talloc
+ *
+ * talloc string allocation and manipulation functions.
+ * @{
+ */
+
+/**
+ * @brief Duplicate a string into a talloc chunk.
+ *
+ * This function is equivalent to:
+ *
+ * @code
+ *      ptr = talloc_size(ctx, strlen(p)+1);
+ *      if (ptr) memcpy(ptr, p, strlen(p)+1);
+ * @endcode
+ *
+ * This functions sets the name of the new pointer to the passed
+ * string. This is equivalent to:
+ *
+ * @code
+ *      talloc_set_name_const(ptr, ptr)
+ * @endcode
+ *
+ * @param[in]  t        The talloc context to hang the result off.
+ *
+ * @param[in]  p        The string you want to duplicate.
+ *
+ * @return              The duplicated string, NULL on error.
+ */
+_PUBLIC_ char *talloc_strdup(const void *t, const char *p);
+
+/**
+ * @brief Append a string to given string.
+ *
+ * The destination string is reallocated to take
+ * <code>strlen(s) + strlen(a) + 1</code> characters.
+ *
+ * This functions sets the name of the new pointer to the new
+ * string. This is equivalent to:
+ *
+ * @code
+ *      talloc_set_name_const(ptr, ptr)
+ * @endcode
+ *
+ * If <code>s == NULL</code> then new context is created.
+ *
+ * @param[in]  s        The destination to append to.
+ *
+ * @param[in]  a        The string you want to append.
+ *
+ * @return              The concatenated strings, NULL on error.
+ *
+ * @see talloc_strdup()
+ * @see talloc_strdup_append_buffer()
+ */
+_PUBLIC_ char *talloc_strdup_append(char *s, const char *a);
+
+/**
+ * @brief Append a string to a given buffer.
+ *
+ * This is a more efficient version of talloc_strdup_append(). It determines the
+ * length of the destination string by the size of the talloc context.
+ *
+ * Use this very carefully as it produces a different result than
+ * talloc_strdup_append() when a zero character is in the middle of the
+ * destination string.
+ *
+ * @code
+ *      char *str_a = talloc_strdup(NULL, "hello world");
+ *      char *str_b = talloc_strdup(NULL, "hello world");
+ *      str_a[5] = str_b[5] = '\0'
+ *
+ *      char *app = talloc_strdup_append(str_a, ", hello");
+ *      char *buf = talloc_strdup_append_buffer(str_b, ", hello");
+ *
+ *      printf("%s\n", app); // hello, hello (app = "hello, hello")
+ *      printf("%s\n", buf); // hello (buf = "hello\0world, hello")
+ * @endcode
+ *
+ * If <code>s == NULL</code> then new context is created.
+ *
+ * @param[in]  s        The destination buffer to append to.
+ *
+ * @param[in]  a        The string you want to append.
+ *
+ * @return              The concatenated strings, NULL on error.
+ *
+ * @see talloc_strdup()
+ * @see talloc_strdup_append()
+ * @see talloc_array_length()
+ */
+_PUBLIC_ char *talloc_strdup_append_buffer(char *s, const char *a);
+
+/**
+ * @brief Duplicate a length-limited string into a talloc chunk.
+ *
+ * This function is the talloc equivalent of the C library function strndup(3).
+ *
+ * This functions sets the name of the new pointer to the passed string. This is
+ * equivalent to:
+ *
+ * @code
+ *      talloc_set_name_const(ptr, ptr)
+ * @endcode
+ *
+ * @param[in]  t        The talloc context to hang the result off.
+ *
+ * @param[in]  p        The string you want to duplicate.
+ *
+ * @param[in]  n        The maximum string length to duplicate.
+ *
+ * @return              The duplicated string, NULL on error.
+ */
+_PUBLIC_ char *talloc_strndup(const void *t, const char *p, size_t n);
+
+/**
+ * @brief Append at most n characters of a string to given string.
+ *
+ * The destination string is reallocated to take
+ * <code>strlen(s) + strnlen(a, n) + 1</code> characters.
+ *
+ * This functions sets the name of the new pointer to the new
+ * string. This is equivalent to:
+ *
+ * @code
+ *      talloc_set_name_const(ptr, ptr)
+ * @endcode
+ *
+ * If <code>s == NULL</code> then new context is created.
+ *
+ * @param[in]  s        The destination string to append to.
+ *
+ * @param[in]  a        The source string you want to append.
+ *
+ * @param[in]  n        The number of characters you want to append from the
+ *                      string.
+ *
+ * @return              The concatenated strings, NULL on error.
+ *
+ * @see talloc_strndup()
+ * @see talloc_strndup_append_buffer()
+ */
+_PUBLIC_ char *talloc_strndup_append(char *s, const char *a, size_t n);
+
+/**
+ * @brief Append at most n characters of a string to given buffer
+ *
+ * This is a more efficient version of talloc_strndup_append(). It determines
+ * the length of the destination string by the size of the talloc context.
+ *
+ * Use this very carefully as it produces a different result than
+ * talloc_strndup_append() when a zero character is in the middle of the
+ * destination string.
+ *
+ * @code
+ *      char *str_a = talloc_strdup(NULL, "hello world");
+ *      char *str_b = talloc_strdup(NULL, "hello world");
+ *      str_a[5] = str_b[5] = '\0'
+ *
+ *      char *app = talloc_strndup_append(str_a, ", hello", 7);
+ *      char *buf = talloc_strndup_append_buffer(str_b, ", hello", 7);
+ *
+ *      printf("%s\n", app); // hello, hello (app = "hello, hello")
+ *      printf("%s\n", buf); // hello (buf = "hello\0world, hello")
+ * @endcode
+ *
+ * If <code>s == NULL</code> then new context is created.
+ *
+ * @param[in]  s        The destination buffer to append to.
+ *
+ * @param[in]  a        The source string you want to append.
+ *
+ * @param[in]  n        The number of characters you want to append from the
+ *                      string.
+ *
+ * @return              The concatenated strings, NULL on error.
+ *
+ * @see talloc_strndup()
+ * @see talloc_strndup_append()
+ * @see talloc_array_length()
+ */
+_PUBLIC_ char *talloc_strndup_append_buffer(char *s, const char *a, size_t n);
+
+/**
+ * @brief Format a string given a va_list.
+ *
+ * This function is the talloc equivalent of the C library function
+ * vasprintf(3).
+ *
+ * This functions sets the name of the new pointer to the new string. This is
+ * equivalent to:
+ *
+ * @code
+ *      talloc_set_name_const(ptr, ptr)
+ * @endcode
+ *
+ * @param[in]  t        The talloc context to hang the result off.
+ *
+ * @param[in]  fmt      The format string.
+ *
+ * @param[in]  ap       The parameters used to fill fmt.
+ *
+ * @return              The formatted string, NULL on error.
+ */
+_PUBLIC_ char *talloc_vasprintf(const void *t, const char *fmt, va_list ap) PRINTF_ATTRIBUTE(2,0);
+
+/**
+ * @brief Format a string given a va_list and append it to the given destination
+ *        string.
+ *
+ * @param[in]  s        The destination string to append to.
+ *
+ * @param[in]  fmt      The format string.
+ *
+ * @param[in]  ap       The parameters used to fill fmt.
+ *
+ * @return              The formatted string, NULL on error.
+ *
+ * @see talloc_vasprintf()
+ */
+_PUBLIC_ char *talloc_vasprintf_append(char *s, const char *fmt, va_list ap) PRINTF_ATTRIBUTE(2,0);
+
+/**
+ * @brief Format a string given a va_list and append it to the given destination
+ *        buffer.
+ *
+ * @param[in]  s        The destination buffer to append to.
+ *
+ * @param[in]  fmt      The format string.
+ *
+ * @param[in]  ap       The parameters used to fill fmt.
+ *
+ * @return              The formatted string, NULL on error.
+ *
+ * @see talloc_vasprintf()
+ */
+_PUBLIC_ char *talloc_vasprintf_append_buffer(char *s, const char *fmt, va_list ap) PRINTF_ATTRIBUTE(2,0);
+
+/**
+ * @brief Build up a string buffer, handle allocation failure
+ *
+ * @param[in] ps Pointer to the talloc'ed string to be extended
+ * @param[in] fmt The format string
+ * @param[in] ... The parameters used to fill fmt.
+ *
+ * This does nothing if *ps is NULL and sets *ps to NULL if the
+ * intermediate reallocation fails. Useful when building up a string
+ * step by step, no intermediate NULL checks are required.
+ */
+_PUBLIC_ void talloc_asprintf_addbuf(char **ps, const char *fmt, ...) \
+	PRINTF_ATTRIBUTE(2,3);
+
+/**
+ * @brief Format a string.
+ *
+ * This function is the talloc equivalent of the C library function asprintf(3).
+ *
+ * This functions sets the name of the new pointer to the new string. This is
+ * equivalent to:
+ *
+ * @code
+ *      talloc_set_name_const(ptr, ptr)
+ * @endcode
+ *
+ * @param[in]  t        The talloc context to hang the result off.
+ *
+ * @param[in]  fmt      The format string.
+ *
+ * @param[in]  ...      The parameters used to fill fmt.
+ *
+ * @return              The formatted string, NULL on error.
+ */
+_PUBLIC_ char *talloc_asprintf(const void *t, const char *fmt, ...) PRINTF_ATTRIBUTE(2,3);
+
+/**
+ * @brief Append a formatted string to another string.
+ *
+ * This function appends the given formatted string to the given string. Use
+ * this variant when the string in the current talloc buffer may have been
+ * truncated in length.
+ *
+ * This functions sets the name of the new pointer to the new
+ * string. This is equivalent to:
+ *
+ * @code
+ *      talloc_set_name_const(ptr, ptr)
+ * @endcode
+ *
+ * If <code>s == NULL</code> then new context is created.
+ *
+ * @param[in]  s        The string to append to.
+ *
+ * @param[in]  fmt      The format string.
+ *
+ * @param[in]  ...      The parameters used to fill fmt.
+ *
+ * @return              The formatted string, NULL on error.
+ */
+_PUBLIC_ char *talloc_asprintf_append(char *s, const char *fmt, ...) PRINTF_ATTRIBUTE(2,3);
+
+/**
+ * @brief Append a formatted string to another string.
+ *
+ * This is a more efficient version of talloc_asprintf_append(). It determines
+ * the length of the destination string by the size of the talloc context.
+ *
+ * Use this very carefully as it produces a different result than
+ * talloc_asprintf_append() when a zero character is in the middle of the
+ * destination string.
+ *
+ * @code
+ *      char *str_a = talloc_strdup(NULL, "hello world");
+ *      char *str_b = talloc_strdup(NULL, "hello world");
+ *      str_a[5] = str_b[5] = '\0'
+ *
+ *      char *app = talloc_asprintf_append(str_a, "%s", ", hello");
+ *      char *buf = talloc_strdup_append_buffer(str_b, "%s", ", hello");
+ *
+ *      printf("%s\n", app); // hello, hello (app = "hello, hello")
+ *      printf("%s\n", buf); // hello (buf = "hello\0world, hello")
+ * @endcode
+ *
+ * If <code>s == NULL</code> then new context is created.
+ *
+ * @param[in]  s        The string to append to
+ *
+ * @param[in]  fmt      The format string.
+ *
+ * @param[in]  ...      The parameters used to fill fmt.
+ *
+ * @return              The formatted string, NULL on error.
+ *
+ * @see talloc_asprintf()
+ * @see talloc_asprintf_append()
+ */
+_PUBLIC_ char *talloc_asprintf_append_buffer(char *s, const char *fmt, ...) PRINTF_ATTRIBUTE(2,3);
+
+/* @} ******************************************************************/
+
+/**
+ * @defgroup talloc_debug The talloc debugging support functions
+ * @ingroup talloc
+ *
+ * To aid memory debugging, talloc contains routines to inspect the currently
+ * allocated memory hierarchy.
+ *
+ * @{
+ */
+
+/**
+ * @brief Walk a complete talloc hierarchy.
+ *
+ * This provides a more flexible reports than talloc_report(). It
+ * will recursively call the callback for the entire tree of memory
+ * referenced by the pointer. References in the tree are passed with
+ * is_ref = 1 and the pointer that is referenced.
+ *
+ * You can pass NULL for the pointer, in which case a report is
+ * printed for the top level memory context, but only if
+ * talloc_enable_leak_report() or talloc_enable_leak_report_full()
+ * has been called.
+ *
+ * The recursion is stopped when depth >= max_depth.
+ * max_depth = -1 means only stop at leaf nodes.
+ *
+ * @param[in]  ptr      The talloc chunk.
+ *
+ * @param[in]  depth    Internal parameter to control recursion. Call with 0.
+ *
+ * @param[in]  max_depth  Maximum recursion level.
+ *
+ * @param[in]  callback  Function to be called on every chunk.
+ *
+ * @param[in]  private_data  Private pointer passed to callback.
+ */
+_PUBLIC_ 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);
+
+/**
+ * @brief Print a talloc hierarchy.
+ *
+ * This provides a more flexible reports than talloc_report(). It
+ * will let you specify the depth and max_depth.
+ *
+ * @param[in]  ptr      The talloc chunk.
+ *
+ * @param[in]  depth    Internal parameter to control recursion. Call with 0.
+ *
+ * @param[in]  max_depth  Maximum recursion level.
+ *
+ * @param[in]  f        The file handle to print to.
+ */
+_PUBLIC_ void talloc_report_depth_file(const void *ptr, int depth, int max_depth, FILE *f);
+
+/**
+ * @brief Print a summary report of all memory used by ptr.
+ *
+ * This provides a more detailed report than talloc_report(). It will
+ * recursively print the entire tree of memory referenced by the
+ * pointer. References in the tree are shown by giving the name of the
+ * pointer that is referenced.
+ *
+ * You can pass NULL for the pointer, in which case a report is printed
+ * for the top level memory context, but only if
+ * talloc_enable_leak_report() or talloc_enable_leak_report_full() has
+ * been called.
+ *
+ * @param[in]  ptr      The talloc chunk.
+ *
+ * @param[in]  f        The file handle to print to.
+ *
+ * Example:
+ * @code
+ *      unsigned int *a, *b;
+ *      a = talloc(NULL, unsigned int);
+ *      b = talloc(a, unsigned int);
+ *      fprintf(stderr, "Dumping memory tree for a:\n");
+ *      talloc_report_full(a, stderr);
+ * @endcode
+ *
+ * @see talloc_report()
+ */
+_PUBLIC_ void talloc_report_full(const void *ptr, FILE *f);
+
+/**
+ * @brief Print a summary report of all memory used by ptr.
+ *
+ * This function prints a summary report of all memory used by ptr. One line of
+ * report is printed for each immediate child of ptr, showing the total memory
+ * and number of blocks used by that child.
+ *
+ * You can pass NULL for the pointer, in which case a report is printed
+ * for the top level memory context, but only if talloc_enable_leak_report()
+ * or talloc_enable_leak_report_full() has been called.
+ *
+ * @param[in]  ptr      The talloc chunk.
+ *
+ * @param[in]  f        The file handle to print to.
+ *
+ * Example:
+ * @code
+ *      unsigned int *a, *b;
+ *      a = talloc(NULL, unsigned int);
+ *      b = talloc(a, unsigned int);
+ *      fprintf(stderr, "Summary of memory tree for a:\n");
+ *      talloc_report(a, stderr);
+ * @endcode
+ *
+ * @see talloc_report_full()
+ */
+_PUBLIC_ void talloc_report(const void *ptr, FILE *f);
+
+/**
+ * @brief Enable tracking the use of NULL memory contexts.
+ *
+ * This enables tracking of the NULL memory context without enabling leak
+ * reporting on exit. Useful for when you want to do your own leak
+ * reporting call via talloc_report_null_full();
+ */
+_PUBLIC_ void talloc_enable_null_tracking(void);
+
+/**
+ * @brief Enable tracking the use of NULL memory contexts.
+ *
+ * This enables tracking of the NULL memory context without enabling leak
+ * reporting on exit. Useful for when you want to do your own leak
+ * reporting call via talloc_report_null_full();
+ */
+_PUBLIC_ void talloc_enable_null_tracking_no_autofree(void);
+
+/**
+ * @brief Disable tracking of the NULL memory context.
+ *
+ * This disables tracking of the NULL memory context.
+ */
+_PUBLIC_ void talloc_disable_null_tracking(void);
+
+/**
+ * @brief Enable leak report when a program exits.
+ *
+ * This enables calling of talloc_report(NULL, stderr) when the program
+ * exits. In Samba4 this is enabled by using the --leak-report command
+ * line option.
+ *
+ * For it to be useful, this function must be called before any other
+ * talloc function as it establishes a "null context" that acts as the
+ * top of the tree. If you don't call this function first then passing
+ * NULL to talloc_report() or talloc_report_full() won't give you the
+ * full tree printout.
+ *
+ * Here is a typical talloc report:
+ *
+ * @code
+ * talloc report on 'null_context' (total 267 bytes in 15 blocks)
+ *      libcli/auth/spnego_parse.c:55  contains     31 bytes in   2 blocks
+ *      libcli/auth/spnego_parse.c:55  contains     31 bytes in   2 blocks
+ *      iconv(UTF8,CP850)              contains     42 bytes in   2 blocks
+ *      libcli/auth/spnego_parse.c:55  contains     31 bytes in   2 blocks
+ *      iconv(CP850,UTF8)              contains     42 bytes in   2 blocks
+ *      iconv(UTF8,UTF-16LE)           contains     45 bytes in   2 blocks
+ *      iconv(UTF-16LE,UTF8)           contains     45 bytes in   2 blocks
+ * @endcode
+ */
+_PUBLIC_ void talloc_enable_leak_report(void);
+
+/**
+ * @brief Enable full leak report when a program exits.
+ *
+ * This enables calling of talloc_report_full(NULL, stderr) when the
+ * program exits. In Samba4 this is enabled by using the
+ * --leak-report-full command line option.
+ *
+ * For it to be useful, this function must be called before any other
+ * talloc function as it establishes a "null context" that acts as the
+ * top of the tree. If you don't call this function first then passing
+ * NULL to talloc_report() or talloc_report_full() won't give you the
+ * full tree printout.
+ *
+ * Here is a typical full report:
+ *
+ * @code
+ * full talloc report on 'root' (total 18 bytes in 8 blocks)
+ *      p1                             contains     18 bytes in   7 blocks (ref 0)
+ *      r1                             contains     13 bytes in   2 blocks (ref 0)
+ *      reference to: p2
+ *      p2                             contains      1 bytes in   1 blocks (ref 1)
+ *      x3                             contains      1 bytes in   1 blocks (ref 0)
+ *      x2                             contains      1 bytes in   1 blocks (ref 0)
+ *      x1                             contains      1 bytes in   1 blocks (ref 0)
+ * @endcode
+ */
+_PUBLIC_ void talloc_enable_leak_report_full(void);
+
+/**
+ * @brief Set a custom "abort" function that is called on serious error.
+ *
+ * The default "abort" function is <code>abort()</code>.
+ *
+ * The "abort" function is called when:
+ *
+ * <ul>
+ *  <li>talloc_get_type_abort() fails</li>
+ *  <li>the provided pointer is not a valid talloc context</li>
+ *  <li>when the context meta data are invalid</li>
+ *  <li>when access after free is detected</li>
+ * </ul>
+ *
+ * Example:
+ *
+ * @code
+ * void my_abort(const char *reason)
+ * {
+ *      fprintf(stderr, "talloc abort: %s\n", reason);
+ *      abort();
+ * }
+ *
+ *      talloc_set_abort_fn(my_abort);
+ * @endcode
+ *
+ * @param[in]  abort_fn      The new "abort" function.
+ *
+ * @see talloc_set_log_fn()
+ * @see talloc_get_type()
+ */
+_PUBLIC_ void talloc_set_abort_fn(void (*abort_fn)(const char *reason));
+
+/**
+ * @brief Set a logging function.
+ *
+ * @param[in]  log_fn      The logging function.
+ *
+ * @see talloc_set_log_stderr()
+ * @see talloc_set_abort_fn()
+ */
+_PUBLIC_ void talloc_set_log_fn(void (*log_fn)(const char *message));
+
+/**
+ * @brief Set stderr as the output for logs.
+ *
+ * @see talloc_set_log_fn()
+ * @see talloc_set_abort_fn()
+ */
+_PUBLIC_ void talloc_set_log_stderr(void);
+
+/**
+ * @brief Set a max memory limit for the current context hierarchy
+ *	  This affects all children of this context and constrain any
+ *	  allocation in the hierarchy to never exceed the limit set.
+ *	  The limit can be removed by setting 0 (unlimited) as the
+ *	  max_size by calling the function again on the same context.
+ *	  Memory limits can also be nested, meaning a child can have
+ *	  a stricter memory limit than a parent.
+ *	  Memory limits are enforced only at memory allocation time.
+ *	  Stealing a context into a 'limited' hierarchy properly
+ *	  updates memory usage but does *not* cause failure if the
+ *	  move causes the new parent to exceed its limits. However
+ *	  any further allocation on that hierarchy will then fail.
+ *
+ * @warning talloc memlimit functionality is deprecated. Please
+ *	    consider using cgroup memory limits instead.
+ *
+ * @param[in]	ctx		The talloc context to set the limit on
+ * @param[in]	max_size	The (new) max_size
+ */
+_PUBLIC_ int talloc_set_memlimit(const void *ctx, size_t max_size) _DEPRECATED_;
+
+/* @} ******************************************************************/
+
+#if TALLOC_DEPRECATED
+#define talloc_zero_p(ctx, type) talloc_zero(ctx, type)
+#define talloc_p(ctx, type) talloc(ctx, type)
+#define talloc_array_p(ctx, type, count) talloc_array(ctx, type, count)
+#define talloc_realloc_p(ctx, p, type, count) talloc_realloc(ctx, p, type, count)
+#define talloc_destroy(ctx) talloc_free(ctx)
+#define talloc_append_string(c, s, a) (s?talloc_strdup_append(s,a):talloc_strdup(c, a))
+#endif
+
+#ifndef TALLOC_MAX_DEPTH
+#define TALLOC_MAX_DEPTH 10000
+#endif
+
+#ifdef __cplusplus
+} /* end of extern "C" */
+#endif
+
+#endif