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f65fd747 | 1 | /* Prototypes and definition for malloc implementation. |
dff8da6b | 2 | Copyright (C) 1996-2024 Free Software Foundation, Inc. |
8a9a5931 | 3 | Copyright The GNU Toolchain Authors. |
f65fd747 UD |
4 | This file is part of the GNU C Library. |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
f65fd747 UD |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
f65fd747 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
f65fd747 UD |
19 | |
20 | #ifndef _MALLOC_H | |
8a4b65b4 | 21 | #define _MALLOC_H 1 |
f65fd747 | 22 | |
4360eafd | 23 | #include <features.h> |
1b2ba891 | 24 | #include <stddef.h> |
bb066545 | 25 | #include <stdio.h> |
f65fd747 | 26 | |
375607b9 | 27 | #ifdef _LIBC |
cf6bbbd7 | 28 | # define __MALLOC_HOOK_VOLATILE |
375607b9 JM |
29 | # define __MALLOC_DEPRECATED |
30 | #else | |
31 | # define __MALLOC_HOOK_VOLATILE volatile | |
7d17596c | 32 | # define __MALLOC_DEPRECATED __attribute_deprecated__ |
375607b9 | 33 | #endif |
f65fd747 | 34 | |
f65fd747 | 35 | |
1b2ba891 | 36 | __BEGIN_DECLS |
f65fd747 | 37 | |
f65fd747 | 38 | /* Allocate SIZE bytes of memory. */ |
9bf8e29c AZ |
39 | extern void *malloc (size_t __size) __THROW __attribute_malloc__ |
40 | __attribute_alloc_size__ ((1)) __wur; | |
f65fd747 UD |
41 | |
42 | /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0. */ | |
cf6bbbd7 | 43 | extern void *calloc (size_t __nmemb, size_t __size) |
9bf8e29c | 44 | __THROW __attribute_malloc__ __attribute_alloc_size__ ((1, 2)) __wur; |
f65fd747 UD |
45 | |
46 | /* Re-allocate the previously allocated block in __ptr, making the new | |
47 | block SIZE bytes long. */ | |
1c3e748e UD |
48 | /* __attribute_malloc__ is not used, because if realloc returns |
49 | the same pointer that was passed to it, aliasing needs to be allowed | |
50 | between objects pointed by the old and new pointers. */ | |
cf6bbbd7 | 51 | extern void *realloc (void *__ptr, size_t __size) |
9bf8e29c | 52 | __THROW __attribute_warn_unused_result__ __attribute_alloc_size__ ((2)); |
f65fd747 | 53 | |
2e0bbbfb DW |
54 | /* Re-allocate the previously allocated block in PTR, making the new |
55 | block large enough for NMEMB elements of SIZE bytes each. */ | |
56 | /* __attribute_malloc__ is not used, because if reallocarray returns | |
57 | the same pointer that was passed to it, aliasing needs to be allowed | |
58 | between objects pointed by the old and new pointers. */ | |
59 | extern void *reallocarray (void *__ptr, size_t __nmemb, size_t __size) | |
c1760eaf MS |
60 | __THROW __attribute_warn_unused_result__ __attribute_alloc_size__ ((2, 3)) |
61 | __attr_dealloc_free; | |
2e0bbbfb | 62 | |
f65fd747 | 63 | /* Free a block allocated by `malloc', `realloc' or `calloc'. */ |
cf6bbbd7 | 64 | extern void free (void *__ptr) __THROW; |
f65fd747 | 65 | |
f65fd747 | 66 | /* Allocate SIZE bytes allocated to ALIGNMENT bytes. */ |
cf6bbbd7 | 67 | extern void *memalign (size_t __alignment, size_t __size) |
8a9a5931 JW |
68 | __THROW __attribute_malloc__ __attribute_alloc_align__ ((1)) |
69 | __attribute_alloc_size__ ((2)) __wur __attr_dealloc_free; | |
f65fd747 UD |
70 | |
71 | /* Allocate SIZE bytes on a page boundary. */ | |
9bf8e29c | 72 | extern void *valloc (size_t __size) __THROW __attribute_malloc__ |
c1760eaf | 73 | __attribute_alloc_size__ ((1)) __wur __attr_dealloc_free; |
f65fd747 UD |
74 | |
75 | /* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up | |
76 | __size to nearest pagesize. */ | |
c1760eaf MS |
77 | extern void *pvalloc (size_t __size) __THROW __attribute_malloc__ |
78 | __wur __attr_dealloc_free; | |
f65fd747 | 79 | |
f65fd747 | 80 | /* SVID2/XPG mallinfo structure */ |
fa8d436c | 81 | |
cf6bbbd7 UD |
82 | struct mallinfo |
83 | { | |
fa8d436c UD |
84 | int arena; /* non-mmapped space allocated from system */ |
85 | int ordblks; /* number of free chunks */ | |
86 | int smblks; /* number of fastbin blocks */ | |
f65fd747 | 87 | int hblks; /* number of mmapped regions */ |
fa8d436c | 88 | int hblkhd; /* space in mmapped regions */ |
ca135f82 | 89 | int usmblks; /* always 0, preserved for backwards compatibility */ |
fa8d436c | 90 | int fsmblks; /* space available in freed fastbin blocks */ |
f65fd747 | 91 | int uordblks; /* total allocated space */ |
fa8d436c | 92 | int fordblks; /* total free space */ |
f65fd747 UD |
93 | int keepcost; /* top-most, releasable (via malloc_trim) space */ |
94 | }; | |
95 | ||
e3960d1c ML |
96 | /* SVID2/XPG mallinfo2 structure which can handle allocations |
97 | bigger than 4GB. */ | |
98 | ||
99 | struct mallinfo2 | |
100 | { | |
101 | size_t arena; /* non-mmapped space allocated from system */ | |
102 | size_t ordblks; /* number of free chunks */ | |
103 | size_t smblks; /* number of fastbin blocks */ | |
104 | size_t hblks; /* number of mmapped regions */ | |
105 | size_t hblkhd; /* space in mmapped regions */ | |
106 | size_t usmblks; /* always 0, preserved for backwards compatibility */ | |
107 | size_t fsmblks; /* space available in freed fastbin blocks */ | |
108 | size_t uordblks; /* total allocated space */ | |
109 | size_t fordblks; /* total free space */ | |
110 | size_t keepcost; /* top-most, releasable (via malloc_trim) space */ | |
111 | }; | |
112 | ||
f65fd747 | 113 | /* Returns a copy of the updated current mallinfo. */ |
30e5069c | 114 | extern struct mallinfo mallinfo (void) __THROW __MALLOC_DEPRECATED; |
f65fd747 | 115 | |
e3960d1c ML |
116 | /* Returns a copy of the updated current mallinfo. */ |
117 | extern struct mallinfo2 mallinfo2 (void) __THROW; | |
118 | ||
f65fd747 UD |
119 | /* SVID2/XPG mallopt options */ |
120 | #ifndef M_MXFAST | |
6c8dbf00 | 121 | # define M_MXFAST 1 /* maximum request size for "fastbins" */ |
f65fd747 UD |
122 | #endif |
123 | #ifndef M_NLBLKS | |
6c8dbf00 | 124 | # define M_NLBLKS 2 /* UNUSED in this malloc */ |
f65fd747 UD |
125 | #endif |
126 | #ifndef M_GRAIN | |
6c8dbf00 | 127 | # define M_GRAIN 3 /* UNUSED in this malloc */ |
f65fd747 UD |
128 | #endif |
129 | #ifndef M_KEEP | |
6c8dbf00 | 130 | # define M_KEEP 4 /* UNUSED in this malloc */ |
f65fd747 UD |
131 | #endif |
132 | ||
133 | /* mallopt options that actually do something */ | |
134 | #define M_TRIM_THRESHOLD -1 | |
135 | #define M_TOP_PAD -2 | |
136 | #define M_MMAP_THRESHOLD -3 | |
137 | #define M_MMAP_MAX -4 | |
10dc2a90 | 138 | #define M_CHECK_ACTION -5 |
6c8dbf00 OB |
139 | #define M_PERTURB -6 |
140 | #define M_ARENA_TEST -7 | |
141 | #define M_ARENA_MAX -8 | |
f65fd747 UD |
142 | |
143 | /* General SVID/XPG interface to tunable parameters. */ | |
cf6bbbd7 | 144 | extern int mallopt (int __param, int __val) __THROW; |
f65fd747 UD |
145 | |
146 | /* Release all but __pad bytes of freed top-most memory back to the | |
147 | system. Return 1 if successful, else 0. */ | |
cf6bbbd7 | 148 | extern int malloc_trim (size_t __pad) __THROW; |
f65fd747 UD |
149 | |
150 | /* Report the number of usable allocated bytes associated with allocated | |
151 | chunk __ptr. */ | |
cf6bbbd7 | 152 | extern size_t malloc_usable_size (void *__ptr) __THROW; |
f65fd747 UD |
153 | |
154 | /* Prints brief summary statistics on stderr. */ | |
cf6bbbd7 | 155 | extern void malloc_stats (void) __THROW; |
f65fd747 | 156 | |
bb066545 | 157 | /* Output information about state of allocator to stream FP. */ |
cf6bbbd7 | 158 | extern int malloc_info (int __options, FILE *__fp) __THROW; |
bb066545 | 159 | |
1b2ba891 | 160 | __END_DECLS |
5107cf1d | 161 | #endif /* malloc.h */ |