Share talloc source code between Samba 3 and Samba 4.

1 files changed, 0 insertions, 738 deletions

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-<?xml version="1.0"?>
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-<refentry>
-  <refmeta>
-    <refentrytitle>talloc</refentrytitle>
-    <manvolnum>3</manvolnum>
-  </refmeta>
-  <refnamediv>
-    <refname>talloc</refname>
-<refpurpose>hierarchical reference counted memory pool system with destructors</refpurpose>
-  </refnamediv>
-  <refsynopsisdiv>
-<synopsis>#include &lt;talloc/talloc.h&gt;</synopsis>
-  </refsynopsisdiv>
-  <refsect1><title>DESCRIPTION</title>
-    <para>
-      If you are used to talloc from Samba3 then please read this
-      carefully, as talloc has changed a lot.
-    </para>
-    <para>
-      The new talloc is a hierarchical, reference counted memory pool
-      system with destructors.	Quite a mouthful really, but not too bad
-      once you get used to it.
-    </para>
-    <para>
-      Perhaps the biggest change from Samba3 is that there is no
-      distinction between a "talloc context" and a "talloc pointer".  Any
-      pointer returned from talloc() is itself a valid talloc context. 
-      This means you can do this:
-    </para>
-    <programlisting>
-    struct foo *X = talloc(mem_ctx, struct foo);
-    X->name = talloc_strdup(X, "foo");
-    </programlisting>
-    <para>
-      and the pointer <literal role="code">X-&gt;name</literal>
-      would be a "child" of the talloc context <literal
-      role="code">X</literal> which is itself a child of
-      <literal role="code">mem_ctx</literal>.  So if you do
-      <literal role="code">talloc_free(mem_ctx)</literal> then
-      it is all destroyed, whereas if you do <literal
-      role="code">talloc_free(X)</literal> then just <literal
-      role="code">X</literal> and <literal
-      role="code">X-&gt;name</literal> are destroyed, and if
-      you do <literal
-      role="code">talloc_free(X-&gt;name)</literal> then just
-      the name element of <literal role="code">X</literal> is
-      destroyed.
-    </para>
-    <para>
-      If you think about this, then what this effectively gives you is an
-      n-ary tree, where you can free any part of the tree with
-      talloc_free().
-    </para>
-    <para>
-      If you find this confusing, then I suggest you run the <literal
-      role="code">testsuite</literal> program to watch talloc
-      in action.  You may also like to add your own tests to <literal
-      role="code">testsuite.c</literal> to clarify how some
-      particular situation is handled.
-    </para>
-  </refsect1>
-  <refsect1><title>TALLOC API</title>
-    <para>
-      The following is a complete guide to the talloc API. Read it all at
-      least twice.
-    </para>
-    <refsect2><title>(type *)talloc(const void *ctx, type);</title>
-        <para>
-	  The talloc() macro is the core of the talloc library.  It takes a
-	  memory <emphasis role="italic">ctx</emphasis> and a <emphasis
-	  role="italic">type</emphasis>, and returns a pointer to a new
-	  area of memory of the given <emphasis
-	  role="italic">type</emphasis>.
-        </para>
-        <para>
-	  The returned pointer is itself a talloc context, so you can use
-	  it as the <emphasis role="italic">ctx</emphasis> argument to more
-	  calls to talloc() if you wish.
-        </para>
-        <para>
-	  The returned pointer is a "child" of the supplied context.  This
-	  means that if you talloc_free() the <emphasis
-	  role="italic">ctx</emphasis> then the new child disappears as
-	  well.  Alternatively you can free just the child.
-        </para>
-        <para>
-	  The <emphasis role="italic">ctx</emphasis> argument to talloc()
-	  can be NULL, in which case a new top level context is created.
-        </para>
-    </refsect2>
-    <refsect2><title>void *talloc_size(const void *ctx, size_t size);</title>
-        <para>
-	  The function talloc_size() 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.
-        </para>
-    </refsect2>
-    <refsect2><title>(typeof(ptr)) talloc_ptrtype(const void *ctx, ptr);</title>
-        <para>
-	  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.
-        </para>
-    </refsect2>
-    <refsect2><title>int talloc_free(void *ptr);</title>
-        <para>
-	  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().
-        </para>
-        <para>
-	  The return value of talloc_free() indicates success or failure,
-	  with 0 returned for success and -1 for failure.  The only
-	  possible failure condition is if <emphasis
-	  role="italic">ptr</emphasis> had a destructor attached to it and
-	  the destructor returned -1.  See <link
-	  linkend="talloc_set_destructor"><quote>talloc_set_destructor()</quote></link>
-	  for details on destructors.
-        </para>
-        <para>
-	  If this pointer has an additional parent when talloc_free() is
-	  called then the memory is not actually released, but instead the
-	  most recently established parent is destroyed.  See <link
-	  linkend="talloc_reference"><quote>talloc_reference()</quote></link>
-	  for details on establishing additional parents.
-        </para>
-        <para>
-	  For more control on which parent is removed, see <link
-	  linkend="talloc_unlink"><quote>talloc_unlink()</quote></link>.
-        </para>
-        <para>
-	  talloc_free() operates recursively on its children.
-        </para>
-    </refsect2>
-    <refsect2 id="talloc_reference"><title>void *talloc_reference(const void *ctx, const void *ptr);</title>
-        <para>
-	  The talloc_reference() function makes <emphasis
-	  role="italic">ctx</emphasis> an additional parent of <emphasis
-	  role="italic">ptr</emphasis>.
-        </para>
-        <para>
-	  The return value of talloc_reference() is always the original
-	  pointer <emphasis role="italic">ptr</emphasis>, unless talloc ran
-	  out of memory in creating the reference in which case it will
-	  return NULL (each additional reference consumes around 48 bytes
-	  of memory on intel x86 platforms).
-        </para>
-        <para>
-	  If <emphasis role="italic">ptr</emphasis> is NULL, then the
-	  function is a no-op, and simply returns NULL.
-        </para>
-        <para>
-	  After creating a reference you can free it in one of the
-	  following ways:
-        </para>
-      <para>
-        <itemizedlist>
-          <listitem>
-            <para>
-	      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.
-            </para>
-          </listitem>
-          <listitem>
-            <para>
-	      you can talloc_free() the pointer itself.  That will destroy
-	      the most recently established parent to the pointer and leave
-	      the pointer as a child of its current parent.
-            </para>
-          </listitem>
-        </itemizedlist>
-      </para>
-      <para>
-	For more control on which parent to remove, see <link
-	linkend="talloc_unlink"><quote>talloc_unlink()</quote></link>.
-      </para>
-    </refsect2>
-    <refsect2 id="talloc_unlink"><title>int talloc_unlink(const void *ctx, const void *ptr);</title>
-        <para>
-	  The talloc_unlink() function removes a specific parent from
-	  <emphasis role="italic">ptr</emphasis>. The <emphasis
-	  role="italic">ctx</emphasis> passed must either be a context used
-	  in talloc_reference() with this pointer, or must be a direct
-	  parent of ptr.
-        </para>
-        <para>
-	  Note that if the parent has already been removed using
-	  talloc_free() then this function will fail and will return -1. 
-	  Likewise, if <emphasis role="italic">ptr</emphasis> is NULL, then
-	  the function will make no modifications and return -1.
-        </para>
-        <para>
-	  Usually you can just use talloc_free() instead of
-	  talloc_unlink(), but sometimes it is useful to have the
-	  additional control on which parent is removed.
-        </para>
-    </refsect2>
-    <refsect2 id="talloc_set_destructor"><title>void talloc_set_destructor(const void *ptr, int (*destructor)(void *));</title>
-        <para>
-	  The function talloc_set_destructor() sets the <emphasis
-	  role="italic">destructor</emphasis> for the pointer <emphasis
-	  role="italic">ptr</emphasis>.  A <emphasis
-	  role="italic">destructor</emphasis> is a function that is called
-	  when the memory used by a pointer is about to be released.  The
-	  destructor receives <emphasis role="italic">ptr</emphasis> as an
-	  argument, and should return 0 for success and -1 for failure.
-        </para>
-        <para>
-	  The <emphasis role="italic">destructor</emphasis> 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.
-        </para>
-        <para>
-	  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.
-        </para>
-        <para>
-	  To remove a destructor call talloc_set_destructor() with NULL for
-	  the destructor.
-        </para>
-        <para>
-	  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.
-        </para>
-    </refsect2>
-    <refsect2><title>int talloc_increase_ref_count(const void *<emphasis role="italic">ptr</emphasis>);</title>
-        <para>
-	  The talloc_increase_ref_count(<emphasis
-	  role="italic">ptr</emphasis>) function is exactly equivalent to:
-        </para>
-        <programlisting>talloc_reference(NULL, ptr);</programlisting>
-        <para>
-	  You can use either syntax, depending on which you think is
-	  clearer in your code.
-        </para>
-        <para>
-	  It returns 0 on success and -1 on failure.
-        </para>
-    </refsect2>
-    <refsect2><title>size_t talloc_reference_count(const void *<emphasis role="italic">ptr</emphasis>);</title>
-        <para>
-	  Return the number of references to the pointer.
-        </para>
-    </refsect2>
-    <refsect2 id="talloc_set_name"><title>void talloc_set_name(const void *ptr, const char *fmt, ...);</title>
-        <para>
-	  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.
-        </para>
-        <para>
-	  The main use for names on pointer is for "talloc reports".  See
-	  <link
-	  linkend="talloc_report"><quote>talloc_report_depth_cb()</quote></link>,
-	  <link
-	  linkend="talloc_report"><quote>talloc_report_depth_file()</quote></link>,
-	  <link
-	  linkend="talloc_report"><quote>talloc_report()</quote></link>
-	  <link
-	  linkend="talloc_report"><quote>talloc_report()</quote></link>
-	  and <link
-	  linkend="talloc_report_full"><quote>talloc_report_full()</quote></link>
-	  for details.	Also see <link
-	  linkend="talloc_enable_leak_report"><quote>talloc_enable_leak_report()</quote></link>
-	  and <link
-	  linkend="talloc_enable_leak_report_full"><quote>talloc_enable_leak_report_full()</quote></link>.
-        </para>
-        <para>
-	  The talloc_set_name() function allocates memory as a child of the
-	  pointer.  It is logically equivalent to:
-        </para>
-        <programlisting>talloc_set_name_const(ptr, talloc_asprintf(ptr, fmt, ...));</programlisting>
-        <para>
-	  Note that 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().
-        </para>
-    </refsect2>
-    <refsect2><title>void talloc_set_name_const(const void *<emphasis role="italic">ptr</emphasis>, const char *<emphasis role="italic">name</emphasis>);</title>
-        <para>
-	  The function talloc_set_name_const() 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().
-        </para>
-        <para>
-	  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 <emphasis
-	  role="italic">name</emphasis> pointer to memory that will
-	  disappear before <emphasis role="italic">ptr</emphasis> is freed
-	  with talloc_free().
-        </para>
-    </refsect2>
-    <refsect2><title>void *talloc_named(const void *<emphasis role="italic">ctx</emphasis>, size_t <emphasis role="italic">size</emphasis>, const char *<emphasis role="italic">fmt</emphasis>, ...);</title>
-        <para>
-	  The talloc_named() function creates a named talloc pointer.  It
-	  is equivalent to:
-        </para>
-        <programlisting>ptr = talloc_size(ctx, size);
-talloc_set_name(ptr, fmt, ....);</programlisting>
-    </refsect2>
-    <refsect2><title>void *talloc_named_const(const void *<emphasis role="italic">ctx</emphasis>, size_t <emphasis role="italic">size</emphasis>, const char *<emphasis role="italic">name</emphasis>);</title>
-        <para>
-	  This is equivalent to:
-        </para>
-        <programlisting>ptr = talloc_size(ctx, size);
-talloc_set_name_const(ptr, name);</programlisting>
-    </refsect2>
-    <refsect2><title>const char *talloc_get_name(const void *<emphasis role="italic">ptr</emphasis>);</title>
-        <para>
-	  This returns the current name for the given talloc pointer,
-	  <emphasis role="italic">ptr</emphasis>. See <link
-	  linkend="talloc_set_name"><quote>talloc_set_name()</quote></link>
-	  for details.
-        </para>
-    </refsect2>
-    <refsect2><title>void *talloc_init(const char *<emphasis role="italic">fmt</emphasis>, ...);</title>
-        <para>
-	  This function creates a zero length named talloc context as a top
-	  level context.  It is equivalent to:
-        </para>
-        <programlisting>talloc_named(NULL, 0, fmt, ...);</programlisting>
-    </refsect2>
-    <refsect2><title>void *talloc_new(void *<emphasis role="italic">ctx</emphasis>);</title>
-        <para>
-	  This is a utility macro that creates a new memory context hanging
-	  off an exiting 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.
-        </para>
-    </refsect2>
-    <refsect2><title>(<emphasis role="italic">type</emphasis> *)talloc_realloc(const void *<emphasis role="italic">ctx</emphasis>, void *<emphasis role="italic">ptr</emphasis>, <emphasis role="italic">type</emphasis>, <emphasis role="italic">count</emphasis>);</title>
-        <para>
-	  The talloc_realloc() macro changes the size of a talloc pointer. 
-	  It has the following equivalences:
-        </para>
-        <programlisting>talloc_realloc(ctx, NULL, type, 1) ==> talloc(ctx, type);
-talloc_realloc(ctx, ptr, type, 0)  ==> talloc_free(ptr);</programlisting>
-        <para>
-	  The <emphasis role="italic">ctx</emphasis> argument is only used
-	  if <emphasis role="italic">ptr</emphasis> is not NULL, otherwise
-	  it is ignored.
-        </para>
-        <para>
-	  talloc_realloc() returns the new pointer, or NULL on failure. 
-	  The call will fail either due to a lack of memory, or because the
-	  pointer has more than one parent (see <link
-	  linkend="talloc_reference"><quote>talloc_reference()</quote></link>).
-        </para>
-    </refsect2>
-    <refsect2><title>void *talloc_realloc_size(const void *ctx, void *ptr, size_t size);</title>
-        <para>
-	  the talloc_realloc_size() function is useful when the type is not
-	  known so the type-safe talloc_realloc() cannot be used.
-        </para>
-    </refsect2>
-    <refsect2><title>TYPE *talloc_steal(const void *<emphasis role="italic">new_ctx</emphasis>, const TYPE *<emphasis role="italic">ptr</emphasis>);</title>
-        <para>
-	  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.
-        </para>
-        <para>
-	  The talloc_steal() function returns the pointer that you pass it.
-	   It does not have any failure modes.
-        </para>
-        <para>
-	  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.
-        </para>
-    </refsect2>
-    <refsect2><title>TYPE *talloc_move(const void *<emphasis role="italic">new_ctx</emphasis>, TYPE **<emphasis role="italic">ptr</emphasis>);</title>
-        <para>
-	  The talloc_move() function is a wrapper around
-	  talloc_steal() which zeros the source pointer after the
-	  move. This avoids a potential source of bugs where a
-	  programmer leaves a pointer in two structures, and uses the
-	  pointer from the old structure after it has been moved to a
-	  new one.
-        </para>
-    </refsect2>
-    <refsect2><title>size_t talloc_total_size(const void *<emphasis role="italic">ptr</emphasis>);</title>
-        <para>
-	  The talloc_total_size() function returns the total size in bytes
-	  used by this pointer and all child pointers.	Mostly useful for
-	  debugging.
-        </para>
-        <para>
-	  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.
-        </para>
-    </refsect2>
-    <refsect2><title>size_t talloc_total_blocks(const void *<emphasis role="italic">ptr</emphasis>);</title>
-        <para>
-	  The talloc_total_blocks() function returns the total memory block
-	  count used by this pointer and all child pointers.  Mostly useful
-	  for debugging.
-        </para>
-        <para>
-	  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.
-        </para>
-    </refsect2>
-    <refsect2 id="talloc_report"><title>void talloc_report(const void *ptr, FILE *f);</title>
-        <para>
-	  The talloc_report() function prints a summary report of all
-	  memory used by <emphasis role="italic">ptr</emphasis>.  One line
-	  of report is printed for each immediate child of ptr, showing the
-	  total memory and number of blocks used by that child.
-        </para>
-        <para>
-	  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.
-        </para>
-    </refsect2>
-    <refsect2 id="talloc_report_full"><title>void talloc_report_full(const void *<emphasis role="italic">ptr</emphasis>, FILE *<emphasis role="italic">f</emphasis>);</title>
-        <para>
-	  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.
-        </para>
-        <para>
-	  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.
-        </para>
-    </refsect2>
-    <refsect2 id="talloc_report_depth_cb">
-     <funcsynopsis><funcprototype>
-      <funcdef>void <function>talloc_report_depth_cb</function></funcdef>
-      <paramdef><parameter>const void *ptr</parameter></paramdef>
-      <paramdef><parameter>int depth</parameter></paramdef>
-      <paramdef><parameter>int max_depth</parameter></paramdef>
-      <paramdef><parameter>void (*callback)(const void *ptr, int depth, int max_depth, int is_ref, void *priv)</parameter></paramdef>
-      <paramdef><parameter>void *priv</parameter></paramdef>
-     </funcprototype></funcsynopsis>
-        <para>
-	  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
-	  <emphasis role="italic">is_ref = 1</emphasis> and the pointer that is referenced.
-        </para>
-        <para>
-	  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.
-        </para>
-        <para>
-	  The recursion is stopped when depth >= max_depth.
-	  max_depth = -1 means only stop at leaf nodes.
-        </para>
-    </refsect2>
-    <refsect2 id="talloc_report_depth_file">
-     <funcsynopsis><funcprototype>
-      <funcdef>void <function>talloc_report_depth_file</function></funcdef>
-      <paramdef><parameter>const void *ptr</parameter></paramdef>
-      <paramdef><parameter>int depth</parameter></paramdef>
-      <paramdef><parameter>int max_depth</parameter></paramdef>
-      <paramdef><parameter>FILE *f</parameter></paramdef>
-     </funcprototype></funcsynopsis>
-        <para>
-	  This provides a more flexible reports than talloc_report(). It
-	  will let you specify the depth and max_depth.
-        </para>
-    </refsect2>
-    <refsect2 id="talloc_enable_leak_report"><title>void talloc_enable_leak_report(void);</title>
-        <para>
-	  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.
-        </para>
-        <para>
-	  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.
-        </para>
-        <para>
-	  Here is a typical talloc report:
-        </para>
-        <screen format="linespecific">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
-      </screen>
-    </refsect2>
-    <refsect2 id="talloc_enable_leak_report_full"><title>void talloc_enable_leak_report_full(void);</title>
-        <para>
-	  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.
-        </para>
-        <para>
-	  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.
-        </para>
-        <para>
-	  Here is a typical full report:
-        </para>
-        <screen format="linespecific">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)
-      </screen>
-    </refsect2>
-    <refsect2><title>(<emphasis role="italic">type</emphasis> *)talloc_zero(const void *<emphasis role="italic">ctx</emphasis>, <emphasis role="italic">type</emphasis>);</title>
-        <para>
-	  The talloc_zero() macro is equivalent to:
-        </para>
-        <programlisting>ptr = talloc(ctx, type);
-if (ptr) memset(ptr, 0, sizeof(type));</programlisting>
-    </refsect2>
-    <refsect2><title>void *talloc_zero_size(const void *<emphasis role="italic">ctx</emphasis>, size_t <emphasis role="italic">size</emphasis>)</title>
-        <para>
-	  The talloc_zero_size() function is useful when you don't have a
-	  known type.
-        </para>
-    </refsect2>
-    <refsect2><title>void *talloc_memdup(const void *<emphasis role="italic">ctx</emphasis>, const void *<emphasis role="italic">p</emphasis>, size_t size);</title>
-        <para>
-	  The talloc_memdup() function is equivalent to:
-        </para>
-        <programlisting>ptr = talloc_size(ctx, size);
-if (ptr) memcpy(ptr, p, size);</programlisting>
-    </refsect2>
-    <refsect2><title>char *talloc_strdup(const void *<emphasis role="italic">ctx</emphasis>, const char *<emphasis role="italic">p</emphasis>);</title>
-        <para>
-	  The talloc_strdup() function is equivalent to:
-        </para>
-        <programlisting>ptr = talloc_size(ctx, strlen(p)+1);
-if (ptr) memcpy(ptr, p, strlen(p)+1);</programlisting>
-        <para>
-	  This function sets the name of the new pointer to the passed
-	  string. This is equivalent to:
-        </para>
-        <programlisting>talloc_set_name_const(ptr, ptr)</programlisting>
-    </refsect2>
-    <refsect2><title>char *talloc_strndup(const void *<emphasis role="italic">t</emphasis>, const char *<emphasis role="italic">p</emphasis>, size_t <emphasis role="italic">n</emphasis>);</title>
-        <para>
-	  The talloc_strndup() function is the talloc equivalent of the C
-	  library function strndup(3).
-        </para>
-        <para>
-	  This function sets the name of the new pointer to the passed
-	  string. This is equivalent to:
-        </para>
-        <programlisting>talloc_set_name_const(ptr, ptr)</programlisting>
-    </refsect2>
-    <refsect2><title>char *talloc_append_string(const void *<emphasis role="italic">t</emphasis>, char *<emphasis role="italic">orig</emphasis>, const char *<emphasis role="italic">append</emphasis>);</title>
-        <para>
-	  The talloc_append_string() function appends the given formatted
-	  string to the given string.
-        </para>
-        <para>
-	  This function sets the name of the new pointer to the new
-	  string. This is equivalent to:
-        </para>
-        <programlisting>talloc_set_name_const(ptr, ptr)</programlisting>
-    </refsect2>
-    <refsect2><title>char *talloc_vasprintf(const void *<emphasis role="italic">t</emphasis>, const char *<emphasis role="italic">fmt</emphasis>, va_list <emphasis role="italic">ap</emphasis>);</title>
-        <para>
-	  The talloc_vasprintf() function is the talloc equivalent of the C
-	  library function vasprintf(3).
-        </para>
-        <para>
-	  This function sets the name of the new pointer to the new
-	  string. This is equivalent to:
-        </para>
-        <programlisting>talloc_set_name_const(ptr, ptr)</programlisting>
-    </refsect2>
-    <refsect2><title>char *talloc_asprintf(const void *<emphasis role="italic">t</emphasis>, const char *<emphasis role="italic">fmt</emphasis>, ...);</title>
-        <para>
-	  The talloc_asprintf() function is the talloc equivalent of the C
-	  library function asprintf(3).
-        </para>
-        <para>
-	  This function sets the name of the new pointer to the passed
-	  string. This is equivalent to:
-        </para>
-        <programlisting>talloc_set_name_const(ptr, ptr)</programlisting>
-    </refsect2>
-    <refsect2><title>char *talloc_asprintf_append(char *s, const char *fmt, ...);</title>
-        <para>
-	  The talloc_asprintf_append() function appends the given formatted
-	  string to the given string.
-        </para>
-        <para>
-	  This function sets the name of the new pointer to the new
-	  string. This is equivalent to:
-        </para>
-        <programlisting>talloc_set_name_const(ptr, ptr)</programlisting>
-    </refsect2>
-    <refsect2><title>(type *)talloc_array(const void *ctx, type, uint_t count);</title>
-        <para>
-	  The talloc_array() macro is equivalent to:
-        </para>
-        <programlisting>(type *)talloc_size(ctx, sizeof(type) * count);</programlisting>
-        <para>
-	  except that it provides integer overflow protection for the
-	  multiply, returning NULL if the multiply overflows.
-        </para>
-    </refsect2>
-    <refsect2><title>void *talloc_array_size(const void *ctx, size_t size, uint_t count);</title>
-        <para>
-	  The talloc_array_size() function is useful when the type is not
-	  known. It operates in the same way as talloc_array(), but takes a
-	  size instead of a type.
-        </para>
-    </refsect2>
-    <refsect2><title>(typeof(ptr)) talloc_array_ptrtype(const void *ctx, ptr, uint_t count);</title>
-        <para>
-	  The talloc_ptrtype() 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.
-        </para>
-    </refsect2>
-    <refsect2><title>void *talloc_realloc_fn(const void *ctx, void *ptr, size_t size)</title>
-        <para>
-	  This is a non-macro version of talloc_realloc(), which is useful
-	  as libraries sometimes want a realloc function pointer.  A
-	  realloc(3) implementation encapsulates the functionality of
-	  malloc(3), free(3) and realloc(3) in one call, which is why it is
-	  useful to be able to pass around a single function pointer.
-        </para>
-    </refsect2>
-    <refsect2><title>void *talloc_autofree_context(void);</title>
-        <para>
-	  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.
-        </para>
-    </refsect2>
-    <refsect2><title>void *talloc_check_name(const void *ptr, const char *name);</title>
-        <para>
-	  This function checks if a pointer has the specified <emphasis
-	  role="italic">name</emphasis>.  If it does then the pointer is
-	  returned.  It it doesn't then NULL is returned.
-        </para>
-    </refsect2>
-    <refsect2><title>(type *)talloc_get_type(const void *ptr, type);</title>
-        <para>
-	  This macro allows you to do type checking on talloc pointers.  It
-	  is particularly useful for void* private pointers.  It is
-	  equivalent to this:
-        </para>
-        <programlisting>(type *)talloc_check_name(ptr, #type)</programlisting>
-    </refsect2>
-    <refsect2><title>talloc_set_type(const void *ptr, type);</title>
-        <para>
-	  This macro allows you to force the name of a pointer to be a
-	  particular <emphasis>type</emphasis>.  This can be
-	  used in conjunction with talloc_get_type() to do type checking on
-	  void* pointers.
-        </para>
-        <para>
-	  It is equivalent to this:
-        </para>
-        <programlisting>talloc_set_name_const(ptr, #type)</programlisting>
-    </refsect2>
-  </refsect1>
-  <refsect1><title>PERFORMANCE</title>
-    <para>
-      All the additional features of talloc(3) over malloc(3) do come at a
-      price.  We have a simple performance test in Samba4 that measures
-      talloc() versus malloc() performance, and it seems that talloc() is
-      about 10% slower than malloc() on my x86 Debian Linux box.  For
-      Samba, the great reduction in code complexity that we get by using
-      talloc makes this worthwhile, especially as the total overhead of
-      talloc/malloc in Samba is already quite small.
-    </para>
-  </refsect1>
-  <refsect1><title>SEE ALSO</title>
-    <para>
-      malloc(3), strndup(3), vasprintf(3), asprintf(3), 
-      <ulink url="http://talloc.samba.org/"/>
-    </para>
-  </refsect1>
-  <refsect1><title>COPYRIGHT/LICENSE</title>
-    <para>
-      Copyright (C) Andrew Tridgell 2004
-    </para>
-    <para>
-      This program is free software; you can redistribute it and/or modify
-      it under the terms of the GNU General Public License as published by
-      the Free Software Foundation; either version 3 of the License, or (at
-      your option) any later version.
-    </para>
-    <para>
-      This program 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
-      General Public License for more details.
-    </para>
-    <para>
-      You should have received a copy of the GNU General Public License
-      along with this program; if not, see http://www.gnu.org/licenses/.
-    </para>
-  </refsect1>
-</refentry>