mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 01:21:06 +00:00
994e529a37
pvalloc is guarantueed to round up the allocation size to the page size, so applications can assume that the memory region is larger than the passed-in argument. The alloc_size attribute cannot express that. The test case is based on a suggestion from Jakub Jelinek. This fixes commit9bf8e29ca1("malloc: make malloc fail with requests larger than PTRDIFF_MAX (BZ#23741)"). Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> (cherry picked from commit768c83b7f6)
164 lines
6.0 KiB
C
164 lines
6.0 KiB
C
/* Prototypes and definition for malloc implementation.
|
|
Copyright (C) 1996-2019 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>
|
|
|
|
#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));
|
|
|
|
/* 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_size__ ((2)) __wur;
|
|
|
|
/* Allocate SIZE bytes on a page boundary. */
|
|
extern void *valloc (size_t __size) __THROW __attribute_malloc__
|
|
__attribute_alloc_size__ ((1)) __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; /* 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 */
|
|
};
|
|
|
|
/* 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;
|
|
|
|
/* Hooks for debugging and user-defined versions. */
|
|
extern void (*__MALLOC_HOOK_VOLATILE __free_hook) (void *__ptr,
|
|
const void *)
|
|
__MALLOC_DEPRECATED;
|
|
extern void *(*__MALLOC_HOOK_VOLATILE __malloc_hook)(size_t __size,
|
|
const void *)
|
|
__MALLOC_DEPRECATED;
|
|
extern void *(*__MALLOC_HOOK_VOLATILE __realloc_hook)(void *__ptr,
|
|
size_t __size,
|
|
const void *)
|
|
__MALLOC_DEPRECATED;
|
|
extern void *(*__MALLOC_HOOK_VOLATILE __memalign_hook)(size_t __alignment,
|
|
size_t __size,
|
|
const void *)
|
|
__MALLOC_DEPRECATED;
|
|
extern void (*__MALLOC_HOOK_VOLATILE __after_morecore_hook) (void);
|
|
|
|
|
|
__END_DECLS
|
|
#endif /* malloc.h */
|