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//usr/include/malloc.h

/* Prototypes and definition for malloc implementation.
   Copyright (C) 1996,1997,1999,2000,2002-2004,2005,2007,2009,2011,2012
   Free Software Foundation, Inc.
   This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _MALLOC_H
#define _MALLOC_H 1

#include <features.h>
#include <stddef.h>
#include <stdio.h>
# define __malloc_ptr_t  void *

/* Used by GNU libc internals. */
#define __malloc_size_t size_t
#define __malloc_ptrdiff_t ptrdiff_t

#ifdef __GNUC__

# define __MALLOC_P(args)	args __THROW
/* This macro will be used for functions which might take C++ callback
   functions.  */
# define __MALLOC_PMT(args)	args

# ifdef _LIBC
#  define __MALLOC_HOOK_VOLATILE
#  define __MALLOC_DEPRECATED
# else
#  define __MALLOC_HOOK_VOLATILE volatile
#  define __MALLOC_DEPRECATED __attribute_deprecated__
# endif

#else	/* Not GCC.  */

# define __MALLOC_P(args)	args
# define __MALLOC_PMT(args)	args
# define __MALLOC_HOOK_VOLATILE
# define __MALLOC_DEPRECATED __attribute_deprecated__

#endif	/* GCC.  */

__BEGIN_DECLS

/* Allocate SIZE bytes of memory.  */
extern void *malloc (size_t __size) __THROW __attribute_malloc__ __wur;

/* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
extern void *calloc (size_t __nmemb, size_t __size)
     __THROW __attribute_malloc__ __wur;

/* Re-allocate the previously allocated block in __ptr, making the new
   block SIZE bytes long.  */
/* __attribute_malloc__ is not used, because if realloc returns
   the same pointer that was passed to it, aliasing needs to be allowed
   between objects pointed by the old and new pointers.  */
extern void *realloc (void *__ptr, size_t __size)
     __THROW __attribute_warn_unused_result__;

/* Free a block allocated by `malloc', `realloc' or `calloc'.  */
extern void free (void *__ptr) __THROW;

/* Free a block allocated by `calloc'. */
extern void cfree (void *__ptr) __THROW;

/* Allocate SIZE bytes allocated to ALIGNMENT bytes.  */
extern void *memalign (size_t __alignment, size_t __size)
     __THROW __attribute_malloc__ __wur;

/* Allocate SIZE bytes on a page boundary.  */
extern void *valloc (size_t __size) __THROW __attribute_malloc__ __wur;

/* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up
   __size to nearest pagesize. */
extern void * pvalloc (size_t __size) __THROW __attribute_malloc__ __wur;

/* Underlying allocation function; successive calls should return
   contiguous pieces of memory.  */
extern void *(*__morecore) (ptrdiff_t __size);

/* Default value of `__morecore'.  */
extern void *__default_morecore (ptrdiff_t __size)
     __THROW __attribute_malloc__;

/* SVID2/XPG mallinfo structure */

struct mallinfo
{
  int arena;    /* non-mmapped space allocated from system */
  int ordblks;  /* number of free chunks */
  int smblks;   /* number of fastbin blocks */
  int hblks;    /* number of mmapped regions */
  int hblkhd;   /* space in mmapped regions */
  int usmblks;  /* maximum total allocated space */
  int fsmblks;  /* space available in freed fastbin blocks */
  int uordblks; /* total allocated space */
  int fordblks; /* total free space */
  int keepcost; /* top-most, releasable (via malloc_trim) space */
};

/* Returns a copy of the updated current mallinfo. */
extern struct mallinfo mallinfo (void) __THROW;

/* SVID2/XPG mallopt options */
#ifndef M_MXFAST
# define M_MXFAST  1	/* maximum request size for "fastbins" */
#endif
#ifndef M_NLBLKS
# define M_NLBLKS  2	/* UNUSED in this malloc */
#endif
#ifndef M_GRAIN
# define M_GRAIN   3	/* UNUSED in this malloc */
#endif
#ifndef M_KEEP
# define M_KEEP    4	/* UNUSED in this malloc */
#endif

/* mallopt options that actually do something */
#define M_TRIM_THRESHOLD    -1
#define M_TOP_PAD           -2
#define M_MMAP_THRESHOLD    -3
#define M_MMAP_MAX          -4
#define M_CHECK_ACTION      -5
#define M_PERTURB	    -6
#define M_ARENA_TEST	    -7
#define M_ARENA_MAX	    -8

/* General SVID/XPG interface to tunable parameters. */
extern int mallopt (int __param, int __val) __THROW;

/* Release all but __pad bytes of freed top-most memory back to the
   system. Return 1 if successful, else 0. */
extern int malloc_trim (size_t __pad) __THROW;

/* Report the number of usable allocated bytes associated with allocated
   chunk __ptr. */
extern size_t malloc_usable_size (void *__ptr) __THROW;

/* Prints brief summary statistics on stderr. */
extern void malloc_stats (void) __THROW;

/* Output information about state of allocator to stream FP.  */
extern int malloc_info (int __options, FILE *__fp) __THROW;

/* Record the state of all malloc variables in an opaque data structure. */
extern void *malloc_get_state (void) __THROW;

/* Restore the state of all malloc variables from data obtained with
   malloc_get_state(). */
extern int malloc_set_state (void *__ptr) __THROW;

/* Called once when malloc is initialized; redefining this variable in
   the application provides the preferred way to set up the hook
   pointers. */
extern void (*__MALLOC_HOOK_VOLATILE __malloc_initialize_hook) (void)
     __MALLOC_DEPRECATED;
/* Hooks for debugging and user-defined versions. */
extern void (*__MALLOC_HOOK_VOLATILE __free_hook) (void *__ptr,
						   const __malloc_ptr_t)
     __MALLOC_DEPRECATED;
extern void *(*__MALLOC_HOOK_VOLATILE __malloc_hook) (size_t __size,
						      const __malloc_ptr_t)
     __MALLOC_DEPRECATED;
extern void *(*__MALLOC_HOOK_VOLATILE __realloc_hook) (void *__ptr,
						       size_t __size,
						       const __malloc_ptr_t)
     __MALLOC_DEPRECATED;
extern void *(*__MALLOC_HOOK_VOLATILE __memalign_hook) (size_t __alignment,
							size_t __size,
							const __malloc_ptr_t)
     __MALLOC_DEPRECATED;
extern void (*__MALLOC_HOOK_VOLATILE __after_morecore_hook) (void);

/* Activate a standard set of debugging hooks. */
extern void __malloc_check_init (void) __THROW __MALLOC_DEPRECATED;

__END_DECLS

#endif /* malloc.h */