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malloc.h

/* Prototypes and definition for malloc implementation.
   Copyright (C) 1996-2022 Free Software Foundation, Inc.
   Copyright The GNU Toolchain Authors.
   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
   <https://www.gnu.org/licenses/>.  */

#ifndef _MALLOC_H
#define _MALLOC_H 1

#include <features.h>
#include <stddef.h>
#include <stdio.h>

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

__BEGIN_DECLS

/* Allocate SIZE bytes of memory.  */
extern void *malloc (size_t __size) __THROW __attribute_malloc__
     __attribute_alloc_size__ ((1)) __wur;

/* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
extern void *calloc (size_t __nmemb, size_t __size)
__THROW __attribute_malloc__ __attribute_alloc_size__ ((1, 2)) __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__ __attribute_alloc_size__ ((2));

/* Re-allocate the previously allocated block in PTR, making the new
   block large enough for NMEMB elements of SIZE bytes each.  */
/* __attribute_malloc__ is not used, because if reallocarray 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 *reallocarray (void *__ptr, size_t __nmemb, size_t __size)
  __THROW __attribute_warn_unused_result__ __attribute_alloc_size__ ((2, 3))
  __attr_dealloc_free;

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

/* Allocate SIZE bytes allocated to ALIGNMENT bytes.  */
extern void *memalign (size_t __alignment, size_t __size)
  __THROW __attribute_malloc__ __attribute_alloc_align__ ((1))
  __attribute_alloc_size__ ((2)) __wur __attr_dealloc_free;

/* Allocate SIZE bytes on a page boundary.  */
extern void *valloc (size_t __size) __THROW __attribute_malloc__
     __attribute_alloc_size__ ((1)) __wur __attr_dealloc_free;

/* 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 __attr_dealloc_free;

/* 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;  /* always 0, preserved for backwards compatibility */
  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 */
};

/* SVID2/XPG mallinfo2 structure which can handle allocations
   bigger than 4GB.  */

struct mallinfo2
{
  size_t arena;    /* non-mmapped space allocated from system */
  size_t ordblks;  /* number of free chunks */
  size_t smblks;   /* number of fastbin blocks */
  size_t hblks;    /* number of mmapped regions */
  size_t hblkhd;   /* space in mmapped regions */
  size_t usmblks;  /* always 0, preserved for backwards compatibility */
  size_t fsmblks;  /* space available in freed fastbin blocks */
  size_t uordblks; /* total allocated space */
  size_t fordblks; /* total free space */
  size_t keepcost; /* top-most, releasable (via malloc_trim) space */
};

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

/* Returns a copy of the updated current mallinfo. */
extern struct mallinfo2 mallinfo2 (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;

__END_DECLS
#endif /* malloc.h */

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