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1/* Prototypes and definition for malloc implementation.
2 Copyright (C) 1996-2018 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#ifndef _MALLOC_H
20#define _MALLOC_H 1
21
22#include <features.h>
23#include <stddef.h>
24#include <stdio.h>
25
26#ifdef _LIBC
27# define __MALLOC_HOOK_VOLATILE
28# define __MALLOC_DEPRECATED
29#else
30# define __MALLOC_HOOK_VOLATILE volatile
31# define __MALLOC_DEPRECATED __attribute_deprecated__
32#endif
33
34
35__BEGIN_DECLS
36
37/* Allocate SIZE bytes of memory. */
38extern void *malloc (size_t __size) __THROW __attribute_malloc__ __wur;
39
40/* Allocate NMEMB elements of SIZE bytes each, all initialized to 0. */
41extern void *calloc (size_t __nmemb, size_t __size)
42__THROW __attribute_malloc__ __wur;
43
44/* Re-allocate the previously allocated block in __ptr, making the new
45 block SIZE bytes long. */
46/* __attribute_malloc__ is not used, because if realloc returns
47 the same pointer that was passed to it, aliasing needs to be allowed
48 between objects pointed by the old and new pointers. */
49extern void *realloc (void *__ptr, size_t __size)
50__THROW __attribute_warn_unused_result__;
51
52/* Re-allocate the previously allocated block in PTR, making the new
53 block large enough for NMEMB elements of SIZE bytes each. */
54/* __attribute_malloc__ is not used, because if reallocarray returns
55 the same pointer that was passed to it, aliasing needs to be allowed
56 between objects pointed by the old and new pointers. */
57extern void *reallocarray (void *__ptr, size_t __nmemb, size_t __size)
58__THROW __attribute_warn_unused_result__;
59
60/* Free a block allocated by `malloc', `realloc' or `calloc'. */
61extern void free (void *__ptr) __THROW;
62
63/* Allocate SIZE bytes allocated to ALIGNMENT bytes. */
64extern void *memalign (size_t __alignment, size_t __size)
65__THROW __attribute_malloc__ __wur;
66
67/* Allocate SIZE bytes on a page boundary. */
68extern void *valloc (size_t __size) __THROW __attribute_malloc__ __wur;
69
70/* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up
71 __size to nearest pagesize. */
72extern void *pvalloc (size_t __size) __THROW __attribute_malloc__ __wur;
73
74/* Underlying allocation function; successive calls should return
75 contiguous pieces of memory. */
76extern void *(*__morecore) (ptrdiff_t __size);
77
78/* Default value of `__morecore'. */
79extern void *__default_morecore (ptrdiff_t __size)
80__THROW __attribute_malloc__;
81
82/* SVID2/XPG mallinfo structure */
83
84struct mallinfo
85{
86 int arena; /* non-mmapped space allocated from system */
87 int ordblks; /* number of free chunks */
88 int smblks; /* number of fastbin blocks */
89 int hblks; /* number of mmapped regions */
90 int hblkhd; /* space in mmapped regions */
91 int usmblks; /* always 0, preserved for backwards compatibility */
92 int fsmblks; /* space available in freed fastbin blocks */
93 int uordblks; /* total allocated space */
94 int fordblks; /* total free space */
95 int keepcost; /* top-most, releasable (via malloc_trim) space */
96};
97
98/* Returns a copy of the updated current mallinfo. */
99extern struct mallinfo mallinfo (void) __THROW;
100
101/* SVID2/XPG mallopt options */
102#ifndef M_MXFAST
103# define M_MXFAST 1 /* maximum request size for "fastbins" */
104#endif
105#ifndef M_NLBLKS
106# define M_NLBLKS 2 /* UNUSED in this malloc */
107#endif
108#ifndef M_GRAIN
109# define M_GRAIN 3 /* UNUSED in this malloc */
110#endif
111#ifndef M_KEEP
112# define M_KEEP 4 /* UNUSED in this malloc */
113#endif
114
115/* mallopt options that actually do something */
116#define M_TRIM_THRESHOLD -1
117#define M_TOP_PAD -2
118#define M_MMAP_THRESHOLD -3
119#define M_MMAP_MAX -4
120#define M_CHECK_ACTION -5
121#define M_PERTURB -6
122#define M_ARENA_TEST -7
123#define M_ARENA_MAX -8
124
125/* General SVID/XPG interface to tunable parameters. */
126extern int mallopt (int __param, int __val) __THROW;
127
128/* Release all but __pad bytes of freed top-most memory back to the
129 system. Return 1 if successful, else 0. */
130extern int malloc_trim (size_t __pad) __THROW;
131
132/* Report the number of usable allocated bytes associated with allocated
133 chunk __ptr. */
134extern size_t malloc_usable_size (void *__ptr) __THROW;
135
136/* Prints brief summary statistics on stderr. */
137extern void malloc_stats (void) __THROW;
138
139/* Output information about state of allocator to stream FP. */
140extern int malloc_info (int __options, FILE *__fp) __THROW;
141
142/* Hooks for debugging and user-defined versions. */
143extern void (*__MALLOC_HOOK_VOLATILE __free_hook) (void *__ptr,
144 const void *)
145__MALLOC_DEPRECATED;
146extern void *(*__MALLOC_HOOK_VOLATILE __malloc_hook)(size_t __size,
147 const void *)
148__MALLOC_DEPRECATED;
149extern void *(*__MALLOC_HOOK_VOLATILE __realloc_hook)(void *__ptr,
150 size_t __size,
151 const void *)
152__MALLOC_DEPRECATED;
153extern void *(*__MALLOC_HOOK_VOLATILE __memalign_hook)(size_t __alignment,
154 size_t __size,
155 const void *)
156__MALLOC_DEPRECATED;
157extern void (*__MALLOC_HOOK_VOLATILE __after_morecore_hook) (void);
158
159/* Activate a standard set of debugging hooks. */
160extern void __malloc_check_init (void) __THROW __MALLOC_DEPRECATED;
161
162
163__END_DECLS
164#endif /* malloc.h */
165

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