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854278dff8
mallopt appropriately. * malloc/malloc.h: Define M_PERTURB. * malloc/malloc.c (perturb_byte): New variable. (alloc_perturb, free_perturb): New macros. (_int_malloc): Before returning, overwrite the memory if this is requested. (_int_free): Overwrite freed memory if requested. (mALLOPt): Handle M_PERTURB. * test-skeleton.c: Add call to mallopt with M_PERTURB command.
171 lines
5.8 KiB
C
171 lines
5.8 KiB
C
/* Prototypes and definition for malloc implementation.
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Copyright (C) 1996,97,99,2000,2002-2004,2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _MALLOC_H
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#define _MALLOC_H 1
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#include <features.h>
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#include <stddef.h>
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# define __malloc_ptr_t void *
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/* Used by GNU libc internals. */
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#define __malloc_size_t size_t
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#define __malloc_ptrdiff_t ptrdiff_t
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#ifdef __GNUC__
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# define __MALLOC_P(args) args __THROW
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/* This macro will be used for functions which might take C++ callback
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functions. */
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# define __MALLOC_PMT(args) args
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#else /* Not GCC. */
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# define __MALLOC_P(args) args
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# define __MALLOC_PMT(args) args
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#endif /* GCC. */
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__BEGIN_DECLS
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/* Allocate SIZE bytes of memory. */
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extern void *malloc __MALLOC_P ((size_t __size)) __attribute_malloc__ __wur;
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/* Allocate NMEMB elements of SIZE bytes each, all initialized to 0. */
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extern void *calloc __MALLOC_P ((size_t __nmemb, size_t __size))
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__attribute_malloc__ __wur;
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/* Re-allocate the previously allocated block in __ptr, making the new
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block SIZE bytes long. */
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extern void *realloc __MALLOC_P ((void *__ptr, size_t __size))
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__attribute_malloc__ __attribute_warn_unused_result__;
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/* Free a block allocated by `malloc', `realloc' or `calloc'. */
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extern void free __MALLOC_P ((void *__ptr));
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/* Free a block allocated by `calloc'. */
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extern void cfree __MALLOC_P ((void *__ptr));
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/* Allocate SIZE bytes allocated to ALIGNMENT bytes. */
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extern void *memalign __MALLOC_P ((size_t __alignment, size_t __size))
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__attribute_malloc__ __wur;
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/* Allocate SIZE bytes on a page boundary. */
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extern void *valloc __MALLOC_P ((size_t __size))
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__attribute_malloc__ __wur;
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/* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up
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__size to nearest pagesize. */
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extern void * pvalloc __MALLOC_P ((size_t __size))
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__attribute_malloc__ __wur;
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/* Underlying allocation function; successive calls should return
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contiguous pieces of memory. */
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extern void *(*__morecore) __MALLOC_PMT ((ptrdiff_t __size));
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/* Default value of `__morecore'. */
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extern void *__default_morecore __MALLOC_P ((ptrdiff_t __size))
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__attribute_malloc__;
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/* SVID2/XPG mallinfo structure */
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struct mallinfo {
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int arena; /* non-mmapped space allocated from system */
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int ordblks; /* number of free chunks */
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int smblks; /* number of fastbin blocks */
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int hblks; /* number of mmapped regions */
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int hblkhd; /* space in mmapped regions */
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int usmblks; /* maximum total allocated space */
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int fsmblks; /* space available in freed fastbin blocks */
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int uordblks; /* total allocated space */
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int fordblks; /* total free space */
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int keepcost; /* top-most, releasable (via malloc_trim) space */
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};
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/* Returns a copy of the updated current mallinfo. */
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extern struct mallinfo mallinfo __MALLOC_P ((void));
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/* SVID2/XPG mallopt options */
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#ifndef M_MXFAST
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# define M_MXFAST 1 /* maximum request size for "fastbins" */
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#endif
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#ifndef M_NLBLKS
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# define M_NLBLKS 2 /* UNUSED in this malloc */
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#endif
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#ifndef M_GRAIN
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# define M_GRAIN 3 /* UNUSED in this malloc */
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#endif
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#ifndef M_KEEP
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# define M_KEEP 4 /* UNUSED in this malloc */
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#endif
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/* mallopt options that actually do something */
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#define M_TRIM_THRESHOLD -1
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#define M_TOP_PAD -2
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#define M_MMAP_THRESHOLD -3
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#define M_MMAP_MAX -4
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#define M_CHECK_ACTION -5
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#define M_PERTURB -6
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/* General SVID/XPG interface to tunable parameters. */
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extern int mallopt __MALLOC_P ((int __param, int __val));
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/* Release all but __pad bytes of freed top-most memory back to the
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system. Return 1 if successful, else 0. */
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extern int malloc_trim __MALLOC_P ((size_t __pad));
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/* Report the number of usable allocated bytes associated with allocated
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chunk __ptr. */
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extern size_t malloc_usable_size __MALLOC_P ((void *__ptr));
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/* Prints brief summary statistics on stderr. */
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extern void malloc_stats __MALLOC_P ((void));
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/* Record the state of all malloc variables in an opaque data structure. */
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extern void *malloc_get_state __MALLOC_P ((void));
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/* Restore the state of all malloc variables from data obtained with
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malloc_get_state(). */
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extern int malloc_set_state __MALLOC_P ((void *__ptr));
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/* Called once when malloc is initialized; redefining this variable in
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the application provides the preferred way to set up the hook
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pointers. */
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extern void (*__malloc_initialize_hook) __MALLOC_PMT ((void));
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/* Hooks for debugging and user-defined versions. */
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extern void (*__free_hook) __MALLOC_PMT ((void *__ptr,
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__const __malloc_ptr_t));
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extern void *(*__malloc_hook) __MALLOC_PMT ((size_t __size,
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__const __malloc_ptr_t));
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extern void *(*__realloc_hook) __MALLOC_PMT ((void *__ptr, size_t __size,
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__const __malloc_ptr_t));
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extern void *(*__memalign_hook) __MALLOC_PMT ((size_t __alignment,
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size_t __size,
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__const __malloc_ptr_t));
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extern void (*__after_morecore_hook) __MALLOC_PMT ((void));
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/* Activate a standard set of debugging hooks. */
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extern void __malloc_check_init __MALLOC_P ((void));
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__END_DECLS
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#endif /* malloc.h */
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