-
Notifications
You must be signed in to change notification settings - Fork 0
/
malloc.h
194 lines (153 loc) · 6.44 KB
/
malloc.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
/* Prototypes and definition for malloc implementation.
Copyright (C) 1996,1997,1999,2000,2002-2004,2005,2007,2009,2011,2012
Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C 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 2.1 of the License, or (at your option) any later version.
The GNU C 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 the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _MALLOC_H
#define _MALLOC_H 1
#include <features.h>
#include <stddef.h>
#include <stdio.h>
# define __malloc_ptr_t void *
/* Used by GNU libc internals. */
#define __malloc_size_t size_t
#define __malloc_ptrdiff_t ptrdiff_t
#ifdef __GNUC__
# define __MALLOC_P(args) args __THROW
/* This macro will be used for functions which might take C++ callback
functions. */
# define __MALLOC_PMT(args) args
# ifdef _LIBC
# define __MALLOC_HOOK_VOLATILE
# define __MALLOC_DEPRECATED
# else
# define __MALLOC_HOOK_VOLATILE volatile
# define __MALLOC_DEPRECATED __attribute_deprecated__
# endif
#else /* Not GCC. */
# define __MALLOC_P(args) args
# define __MALLOC_PMT(args) args
# define __MALLOC_HOOK_VOLATILE
# define __MALLOC_DEPRECATED __attribute_deprecated__
#endif /* GCC. */
__BEGIN_DECLS
/* Allocate SIZE bytes of memory. */
extern void *malloc (size_t __size) __THROW __attribute_malloc__ __wur;
/* Allocate NMEMB elements of SIZE bytes each, all initialized to 0. */
extern void *calloc (size_t __nmemb, size_t __size)
__THROW __attribute_malloc__ __wur;
/* Re-allocate the previously allocated block in __ptr, making the new
block SIZE bytes long. */
/* __attribute_malloc__ is not used, because if realloc returns
the same pointer that was passed to it, aliasing needs to be allowed
between objects pointed by the old and new pointers. */
extern void *realloc (void *__ptr, size_t __size)
__THROW __attribute_warn_unused_result__;
/* Free a block allocated by `malloc', `realloc' or `calloc'. */
extern void free (void *__ptr) __THROW;
/* Free a block allocated by `calloc'. */
extern void cfree (void *__ptr) __THROW;
/* Allocate SIZE bytes allocated to ALIGNMENT bytes. */
extern void *memalign (size_t __alignment, size_t __size)
__THROW __attribute_malloc__ __wur;
/* Allocate SIZE bytes on a page boundary. */
extern void *valloc (size_t __size) __THROW __attribute_malloc__ __wur;
/* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up
__size to nearest pagesize. */
extern void * pvalloc (size_t __size) __THROW __attribute_malloc__ __wur;
/* Underlying allocation function; successive calls should return
contiguous pieces of memory. */
extern void *(*__morecore) (ptrdiff_t __size);
/* Default value of `__morecore'. */
extern void *__default_morecore (ptrdiff_t __size)
__THROW __attribute_malloc__;
/* SVID2/XPG mallinfo structure */
struct mallinfo
{
int arena; /* non-mmapped space allocated from system */
int ordblks; /* number of free chunks */
int smblks; /* number of fastbin blocks */
int hblks; /* number of mmapped regions */
int hblkhd; /* space in mmapped regions */
int usmblks; /* maximum total allocated space */
int fsmblks; /* space available in freed fastbin blocks */
int uordblks; /* total allocated space */
int fordblks; /* total free space */
int keepcost; /* top-most, releasable (via malloc_trim) space */
};
/* Returns a copy of the updated current mallinfo. */
extern struct mallinfo mallinfo (void) __THROW;
/* SVID2/XPG mallopt options */
#ifndef M_MXFAST
# define M_MXFAST 1 /* maximum request size for "fastbins" */
#endif
#ifndef M_NLBLKS
# define M_NLBLKS 2 /* UNUSED in this malloc */
#endif
#ifndef M_GRAIN
# define M_GRAIN 3 /* UNUSED in this malloc */
#endif
#ifndef M_KEEP
# define M_KEEP 4 /* UNUSED in this malloc */
#endif
/* mallopt options that actually do something */
#define M_TRIM_THRESHOLD -1
#define M_TOP_PAD -2
#define M_MMAP_THRESHOLD -3
#define M_MMAP_MAX -4
#define M_CHECK_ACTION -5
#define M_PERTURB -6
#define M_ARENA_TEST -7
#define M_ARENA_MAX -8
/* General SVID/XPG interface to tunable parameters. */
extern int mallopt (int __param, int __val) __THROW;
/* Release all but __pad bytes of freed top-most memory back to the
system. Return 1 if successful, else 0. */
extern int malloc_trim (size_t __pad) __THROW;
/* Report the number of usable allocated bytes associated with allocated
chunk __ptr. */
extern size_t malloc_usable_size (void *__ptr) __THROW;
/* Prints brief summary statistics on stderr. */
extern void malloc_stats (void) __THROW;
/* Output information about state of allocator to stream FP. */
extern int malloc_info (int __options, FILE *__fp) __THROW;
/* Record the state of all malloc variables in an opaque data structure. */
extern void *malloc_get_state (void) __THROW;
/* Restore the state of all malloc variables from data obtained with
malloc_get_state(). */
extern int malloc_set_state (void *__ptr) __THROW;
/* Called once when malloc is initialized; redefining this variable in
the application provides the preferred way to set up the hook
pointers. */
extern void (*__MALLOC_HOOK_VOLATILE __malloc_initialize_hook) (void)
__MALLOC_DEPRECATED;
/* Hooks for debugging and user-defined versions. */
extern void (*__MALLOC_HOOK_VOLATILE __free_hook) (void *__ptr,
const __malloc_ptr_t)
__MALLOC_DEPRECATED;
extern void *(*__MALLOC_HOOK_VOLATILE __malloc_hook) (size_t __size,
const __malloc_ptr_t)
__MALLOC_DEPRECATED;
extern void *(*__MALLOC_HOOK_VOLATILE __realloc_hook) (void *__ptr,
size_t __size,
const __malloc_ptr_t)
__MALLOC_DEPRECATED;
extern void *(*__MALLOC_HOOK_VOLATILE __memalign_hook) (size_t __alignment,
size_t __size,
const __malloc_ptr_t)
__MALLOC_DEPRECATED;
extern void (*__MALLOC_HOOK_VOLATILE __after_morecore_hook) (void);
/* Activate a standard set of debugging hooks. */
extern void __malloc_check_init (void) __THROW __MALLOC_DEPRECATED;
__END_DECLS
#endif /* malloc.h */