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-'\" t
-.\" Copyright (c) 2012 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH malloc_get_state 3 2023-11-01 "Linux man-pages 6.7"
-.SH NAME
-malloc_get_state, malloc_set_state \-
-record and restore state of malloc implementation
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <malloc.h>
-.P
-.B void *malloc_get_state(void);
-.BI "int malloc_set_state(void *" state );
-.fi
-.SH DESCRIPTION
-.IR Note :
-these functions are removed in glibc 2.25.
-.P
-The
-.BR malloc_get_state ()
-function records the current state of all
-.BR malloc (3)
-internal bookkeeping variables
-(but not the actual contents of the heap
-or the state of
-.BR malloc_hook (3)
-functions pointers).
-The state is recorded in a system-dependent opaque data structure
-dynamically allocated via
-.BR malloc (3),
-and a pointer to that data structure is returned as the function result.
-(It is the caller's responsibility to
-.BR free (3)
-this memory.)
-.P
-The
-.BR malloc_set_state ()
-function restores the state of all
-.BR malloc (3)
-internal bookkeeping variables to the values recorded in
-the opaque data structure pointed to by
-.IR state .
-.SH RETURN VALUE
-On success,
-.BR malloc_get_state ()
-returns a pointer to a newly allocated opaque data structure.
-On error (for example, memory could not be allocated for the data structure),
-.BR malloc_get_state ()
-returns NULL.
-.P
-On success,
-.BR malloc_set_state ()
-returns 0.
-If the implementation detects that
-.I state
-does not point to a correctly formed data structure,
-.\" if(ms->magic != MALLOC_STATE_MAGIC) return -1;
-.BR malloc_set_state ()
-returns \-1.
-If the implementation detects that
-the version of the data structure referred to by
-.I state
-is a more recent version than this implementation knows about,
-.\" /* Must fail if the major version is too high. */
-.\" if((ms->version & ~0xffl) > (MALLOC_STATE_VERSION & ~0xffl)) return -2;
-.BR malloc_set_state ()
-returns \-2.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR malloc_get_state (),
-.BR malloc_set_state ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-GNU.
-.SH NOTES
-These functions are useful when using this
-.BR malloc (3)
-implementation as part of a shared library,
-and the heap contents are saved/restored via some other method.
-This technique is used by GNU Emacs to implement its "dumping" function.
-.P
-Hook function pointers are never saved or restored by these
-functions, with two exceptions:
-if malloc checking (see
-.BR mallopt (3))
-was in use when
-.BR malloc_get_state ()
-was called, then
-.BR malloc_set_state ()
-resets malloc checking hooks
-.\" i.e., calls __malloc_check_init()
-if possible;
-.\" i.e., malloc checking is not already in use
-.\" and the caller requested malloc checking
-if malloc checking was not in use in the recorded state,
-but the caller has requested malloc checking,
-then the hooks are reset to 0.
-.SH SEE ALSO
-.BR malloc (3),
-.BR mallopt (3)