105 lines
4 KiB
C
105 lines
4 KiB
C
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/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _MALLOC_H_
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#define _MALLOC_H_
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#include <sys/cdefs.h>
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#include <stddef.h>
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__BEGIN_DECLS
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extern __mallocfunc void* malloc(size_t);
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extern __mallocfunc void* calloc(size_t, size_t);
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extern __mallocfunc void* realloc(void *, size_t);
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extern void free(void *);
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extern void* memalign(size_t alignment, size_t bytesize);
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extern void* valloc(size_t bytesize);
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extern void* pvalloc(size_t bytesize);
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extern int mallopt(int param_number, int param_value);
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extern size_t malloc_footprint(void);
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extern size_t malloc_max_footprint(void);
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struct mallinfo {
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size_t arena; /* non-mmapped space allocated from system */
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size_t ordblks; /* number of free chunks */
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size_t smblks; /* always 0 */
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size_t hblks; /* always 0 */
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size_t hblkhd; /* space in mmapped regions */
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size_t usmblks; /* maximum total allocated space */
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size_t fsmblks; /* always 0 */
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size_t uordblks; /* total allocated space */
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size_t fordblks; /* total free space */
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size_t keepcost; /* releasable (via malloc_trim) space */
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};
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extern struct mallinfo mallinfo(void);
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/*
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malloc_usable_size(void* p);
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Returns the number of bytes you can actually use in
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an allocated chunk, which may be more than you requested (although
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often not) due to alignment and minimum size constraints.
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You can use this many bytes without worrying about
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overwriting other allocated objects. This is not a particularly great
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programming practice. malloc_usable_size can be more useful in
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debugging and assertions, for example:
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p = malloc(n);
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assert(malloc_usable_size(p) >= 256);
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*/
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extern size_t malloc_usable_size(void* block);
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/*
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malloc_stats();
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Prints on stderr the amount of space obtained from the system (both
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via sbrk and mmap), the maximum amount (which may be more than
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current if malloc_trim and/or munmap got called), and the current
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number of bytes allocated via malloc (or realloc, etc) but not yet
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freed. Note that this is the number of bytes allocated, not the
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number requested. It will be larger than the number requested
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because of alignment and bookkeeping overhead. Because it includes
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alignment wastage as being in use, this figure may be greater than
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zero even when no user-level chunks are allocated.
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The reported current and maximum system memory can be inaccurate if
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a program makes other calls to system memory allocation functions
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(normally sbrk) outside of malloc.
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malloc_stats prints only the most commonly interesting statistics.
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More information can be obtained by calling mallinfo.
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*/
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extern void malloc_stats(void);
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__END_DECLS
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#endif /* _MALLOC_H_ */
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