1 /* Prototypes and definition for malloc implementation.
2 Copyright (C) 1996-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
27 # define __MALLOC_HOOK_VOLATILE
28 # define __MALLOC_DEPRECATED
30 # define __MALLOC_HOOK_VOLATILE volatile
31 # define __MALLOC_DEPRECATED __attribute_deprecated__
37 /* Allocate SIZE bytes of memory. */
38 extern void *malloc (size_t __size
) __THROW __attribute_malloc__
39 __attribute_alloc_size__ ((1)) __wur
;
41 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0. */
42 extern void *calloc (size_t __nmemb
, size_t __size
)
43 __THROW __attribute_malloc__
__attribute_alloc_size__ ((1, 2)) __wur
;
45 /* Re-allocate the previously allocated block in __ptr, making the new
46 block SIZE bytes long. */
47 /* __attribute_malloc__ is not used, because if realloc returns
48 the same pointer that was passed to it, aliasing needs to be allowed
49 between objects pointed by the old and new pointers. */
50 extern void *realloc (void *__ptr
, size_t __size
)
51 __THROW __attribute_warn_unused_result__
__attribute_alloc_size__ ((2));
53 /* Re-allocate the previously allocated block in PTR, making the new
54 block large enough for NMEMB elements of SIZE bytes each. */
55 /* __attribute_malloc__ is not used, because if reallocarray returns
56 the same pointer that was passed to it, aliasing needs to be allowed
57 between objects pointed by the old and new pointers. */
58 extern void *reallocarray (void *__ptr
, size_t __nmemb
, size_t __size
)
59 __THROW __attribute_warn_unused_result__
__attribute_alloc_size__ ((2, 3));
61 /* Free a block allocated by `malloc', `realloc' or `calloc'. */
62 extern void free (void *__ptr
) __THROW
;
64 /* Allocate SIZE bytes allocated to ALIGNMENT bytes. */
65 extern void *memalign (size_t __alignment
, size_t __size
)
66 __THROW __attribute_malloc__
__attribute_alloc_size__ ((2)) __wur
;
68 /* Allocate SIZE bytes on a page boundary. */
69 extern void *valloc (size_t __size
) __THROW __attribute_malloc__
70 __attribute_alloc_size__ ((1)) __wur
;
72 /* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up
73 __size to nearest pagesize. */
74 extern void *pvalloc (size_t __size
) __THROW __attribute_malloc__
75 __attribute_alloc_size__ ((1)) __wur
;
77 /* Underlying allocation function; successive calls should return
78 contiguous pieces of memory. */
79 extern void *(*__morecore
) (ptrdiff_t __size
);
81 /* Default value of `__morecore'. */
82 extern void *__default_morecore (ptrdiff_t __size
)
83 __THROW __attribute_malloc__
;
85 /* SVID2/XPG mallinfo structure */
89 int arena
; /* non-mmapped space allocated from system */
90 int ordblks
; /* number of free chunks */
91 int smblks
; /* number of fastbin blocks */
92 int hblks
; /* number of mmapped regions */
93 int hblkhd
; /* space in mmapped regions */
94 int usmblks
; /* always 0, preserved for backwards compatibility */
95 int fsmblks
; /* space available in freed fastbin blocks */
96 int uordblks
; /* total allocated space */
97 int fordblks
; /* total free space */
98 int keepcost
; /* top-most, releasable (via malloc_trim) space */
101 /* Returns a copy of the updated current mallinfo. */
102 extern struct mallinfo
mallinfo (void) __THROW
;
104 /* SVID2/XPG mallopt options */
106 # define M_MXFAST 1 /* maximum request size for "fastbins" */
109 # define M_NLBLKS 2 /* UNUSED in this malloc */
112 # define M_GRAIN 3 /* UNUSED in this malloc */
115 # define M_KEEP 4 /* UNUSED in this malloc */
118 /* mallopt options that actually do something */
119 #define M_TRIM_THRESHOLD -1
121 #define M_MMAP_THRESHOLD -3
122 #define M_MMAP_MAX -4
123 #define M_CHECK_ACTION -5
125 #define M_ARENA_TEST -7
126 #define M_ARENA_MAX -8
128 /* General SVID/XPG interface to tunable parameters. */
129 extern int mallopt (int __param
, int __val
) __THROW
;
131 /* Release all but __pad bytes of freed top-most memory back to the
132 system. Return 1 if successful, else 0. */
133 extern int malloc_trim (size_t __pad
) __THROW
;
135 /* Report the number of usable allocated bytes associated with allocated
137 extern size_t malloc_usable_size (void *__ptr
) __THROW
;
139 /* Prints brief summary statistics on stderr. */
140 extern void malloc_stats (void) __THROW
;
142 /* Output information about state of allocator to stream FP. */
143 extern int malloc_info (int __options
, FILE *__fp
) __THROW
;
145 /* Hooks for debugging and user-defined versions. */
146 extern void (*__MALLOC_HOOK_VOLATILE __free_hook
) (void *__ptr
,
149 extern void *(*__MALLOC_HOOK_VOLATILE __malloc_hook
)(size_t __size
,
152 extern void *(*__MALLOC_HOOK_VOLATILE __realloc_hook
)(void *__ptr
,
156 extern void *(*__MALLOC_HOOK_VOLATILE __memalign_hook
)(size_t __alignment
,
160 extern void (*__MALLOC_HOOK_VOLATILE __after_morecore_hook
) (void);
164 #endif /* malloc.h */