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malloc.h
/* Prototypes and definition for malloc implementation. Copyright (C) 1996-2018 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__ __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__; /* 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__; /* 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__ __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; /* 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); /* Activate a standard set of debugging hooks. */ extern void __malloc_check_init (void) __THROW __MALLOC_DEPRECATED; __END_DECLS #endif /* malloc.h */
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