1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 #ifndef _MALLOC_H_ 29 #define _MALLOC_H_ 30 31 #include <sys/cdefs.h> 32 #include <stddef.h> 33 34 __BEGIN_DECLS 35 36 extern __mallocfunc void* malloc(size_t); 37 extern __mallocfunc void* calloc(size_t, size_t); 38 extern __mallocfunc void* realloc(void *, size_t); 39 extern void free(void *); 40 41 extern void* memalign(size_t alignment, size_t bytesize); 42 extern void* valloc(size_t bytesize); 43 extern void* pvalloc(size_t bytesize); 44 extern int mallopt(int param_number, int param_value); 45 extern size_t malloc_footprint(void); 46 extern size_t malloc_max_footprint(void); 47 48 struct mallinfo { 49 size_t arena; /* non-mmapped space allocated from system */ 50 size_t ordblks; /* number of free chunks */ 51 size_t smblks; /* always 0 */ 52 size_t hblks; /* always 0 */ 53 size_t hblkhd; /* space in mmapped regions */ 54 size_t usmblks; /* maximum total allocated space */ 55 size_t fsmblks; /* always 0 */ 56 size_t uordblks; /* total allocated space */ 57 size_t fordblks; /* total free space */ 58 size_t keepcost; /* releasable (via malloc_trim) space */ 59 }; 60 61 extern struct mallinfo mallinfo(void); 62 63 64 /* 65 malloc_usable_size(void* p); 66 67 Returns the number of bytes you can actually use in 68 an allocated chunk, which may be more than you requested (although 69 often not) due to alignment and minimum size constraints. 70 You can use this many bytes without worrying about 71 overwriting other allocated objects. This is not a particularly great 72 programming practice. malloc_usable_size can be more useful in 73 debugging and assertions, for example: 74 75 p = malloc(n); 76 assert(malloc_usable_size(p) >= 256); 77 */ 78 extern size_t malloc_usable_size(void* block); 79 80 /* 81 malloc_stats(); 82 Prints on stderr the amount of space obtained from the system (both 83 via sbrk and mmap), the maximum amount (which may be more than 84 current if malloc_trim and/or munmap got called), and the current 85 number of bytes allocated via malloc (or realloc, etc) but not yet 86 freed. Note that this is the number of bytes allocated, not the 87 number requested. It will be larger than the number requested 88 because of alignment and bookkeeping overhead. Because it includes 89 alignment wastage as being in use, this figure may be greater than 90 zero even when no user-level chunks are allocated. 91 92 The reported current and maximum system memory can be inaccurate if 93 a program makes other calls to system memory allocation functions 94 (normally sbrk) outside of malloc. 95 96 malloc_stats prints only the most commonly interesting statistics. 97 More information can be obtained by calling mallinfo. 98 */ 99 extern void malloc_stats(void); 100 101 __END_DECLS 102 103 #endif /* _MALLOC_H_ */ 104 105
