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-.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.\" Heavily based on glibc documentation
-.\" Polished, added docs, removed glibc doc bug, 2002-07-20, aeb
-.\"
-.TH __malloc_hook 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-__malloc_hook, __malloc_initialize_hook,
-__memalign_hook, __free_hook, __realloc_hook,
-__after_morecore_hook \- malloc debugging variables (DEPRECATED)
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B "#include <malloc.h>"
-.P
-.BI "void *(*volatile __malloc_hook)(size_t " size ", const void *" caller );
-.P
-.BI "void *(*volatile __realloc_hook)(void *" ptr ", size_t " size ,
-.BI "                         const void *" caller );
-.P
-.BI "void *(*volatile __memalign_hook)(size_t " alignment ", size_t " size ,
-.BI "                         const void *" caller );
-.P
-.BI "void (*volatile __free_hook)(void *" ptr ", const void *" caller );
-.P
-.B "void (*__malloc_initialize_hook)(void);"
-.P
-.B "void (*volatile __after_morecore_hook)(void);"
-.fi
-.SH DESCRIPTION
-The GNU C library lets you modify the behavior of
-.BR malloc (3),
-.BR realloc (3),
-and
-.BR free (3)
-by specifying appropriate hook functions.
-You can use these hooks
-to help you debug programs that use dynamic memory allocation,
-for example.
-.P
-The variable
-.B __malloc_initialize_hook
-points at a function that is called once when the malloc implementation
-is initialized.
-This is a weak variable, so it can be overridden in
-the application with a definition like the following:
-.P
-.in +4n
-.EX
-void (*__malloc_initialize_hook)(void) = my_init_hook;
-.EE
-.in
-.P
-Now the function
-.IR my_init_hook ()
-can do the initialization of all hooks.
-.P
-The four functions pointed to by
-.BR __malloc_hook ,
-.BR __realloc_hook ,
-.BR __memalign_hook ,
-.B __free_hook
-have a prototype like the functions
-.BR malloc (3),
-.BR realloc (3),
-.BR memalign (3),
-.BR free (3),
-respectively, except that they have a final argument
-.I caller
-that gives the address of the caller of
-.BR malloc (3),
-etc.
-.P
-The variable
-.B __after_morecore_hook
-points at a function that is called each time after
-.BR sbrk (2)
-was asked for more memory.
-.SH STANDARDS
-GNU.
-.SH NOTES
-The use of these hook functions is not safe in multithreaded programs,
-and they are now deprecated.
-From glibc 2.24 onwards, the
-.B __malloc_initialize_hook
-variable has been removed from the API,
-and from glibc 2.34 onwards, all
-the hook variables have been removed from the API.
-.\" https://bugzilla.redhat.com/show_bug.cgi?id=450187
-.\" http://sourceware.org/bugzilla/show_bug.cgi?id=9957
-Programmers should instead preempt calls to the relevant functions
-by defining and exporting
-.BR malloc (),
-.BR free (),
-.BR realloc (),
-and
-.BR calloc ().
-.SH EXAMPLES
-Here is a short example of how to use these variables.
-.P
-.EX
-#include <stdio.h>
-#include <malloc.h>
-\&
-/* Prototypes for our hooks */
-static void my_init_hook(void);
-static void *my_malloc_hook(size_t, const void *);
-\&
-/* Variables to save original hooks */
-static void *(*old_malloc_hook)(size_t, const void *);
-\&
-/* Override initializing hook from the C library */
-void (*__malloc_initialize_hook)(void) = my_init_hook;
-\&
-static void
-my_init_hook(void)
-{
-    old_malloc_hook = __malloc_hook;
-    __malloc_hook = my_malloc_hook;
-}
-\&
-static void *
-my_malloc_hook(size_t size, const void *caller)
-{
-    void *result;
-\&
-    /* Restore all old hooks */
-    __malloc_hook = old_malloc_hook;
-\&
-    /* Call recursively */
-    result = malloc(size);
-\&
-    /* Save underlying hooks */
-    old_malloc_hook = __malloc_hook;
-\&
-    /* printf() might call malloc(), so protect it too */
-    printf("malloc(%zu) called from %p returns %p\en",
-            size, caller, result);
-\&
-    /* Restore our own hooks */
-    __malloc_hook = my_malloc_hook;
-\&
-    return result;
-}
-.EE
-.SH SEE ALSO
-.BR mallinfo (3),
-.BR malloc (3),
-.BR mcheck (3),
-.BR mtrace (3)