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001: /* Prototypes and definition for malloc implementation.
002:    Copyright (C) 1996, 1997, 1999, 2000, 2002-2004, 2005, 2007, 2009, 2011
003:    Free Software Foundation, Inc.
004:    This file is part of the GNU C Library.
005: 
006:    The GNU C Library is free software; you can redistribute it and/or
007:    modify it under the terms of the GNU Lesser General Public
008:    License as published by the Free Software Foundation; either
009:    version 2.1 of the License, or (at your option) any later version.
010: 
011:    The GNU C Library is distributed in the hope that it will be useful,
012:    but WITHOUT ANY WARRANTY; without even the implied warranty of
013:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:    Lesser General Public License for more details.
015: 
016:    You should have received a copy of the GNU Lesser General Public
017:    License along with the GNU C Library; if not, write to the Free
018:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
019:    02111-1307 USA.  */
020: 
021: #ifndef _MALLOC_H
022: #define _MALLOC_H 1
023: 
024: #include <features.h>
025: #include <stddef.h>
026: #include <stdio.h>
027: # define __malloc_ptr_t  void *
028: 
029: /* Used by GNU libc internals. */
030: #define __malloc_size_t size_t
031: #define __malloc_ptrdiff_t ptrdiff_t
032: 
033: #ifdef __GNUC__
034: 
035: # define __MALLOC_P(args)       args __THROW
036: /* This macro will be used for functions which might take C++ callback
037:    functions.  */
038: # define __MALLOC_PMT(args)     args
039: 
040: # ifdef _LIBC
041: #  define __MALLOC_HOOK_VOLATILE
042: #  define __MALLOC_DEPRECATED
043: # else
044: #  define __MALLOC_HOOK_VOLATILE __volatile
045: #  define __MALLOC_DEPRECATED __attribute_deprecated__
046: # endif
047: 
048: #else   /* Not GCC.  */
049: 
050: # define __MALLOC_P(args)       args
051: # define __MALLOC_PMT(args)     args
052: # define __MALLOC_HOOK_VOLATILE
053: # define __MALLOC_DEPRECATED __attribute_deprecated__
054: 
055: #endif  /* GCC.  */
056: 
057: 
058: __BEGIN_DECLS
059: 
060: /* Allocate SIZE bytes of memory.  */
061: extern void *malloc (size_t __size) __THROW __attribute_malloc__ __wur;
062: 
063: /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
064: extern void *calloc (size_t __nmemb, size_t __size)
065:      __THROW __attribute_malloc__ __wur;
066: 
067: /* Re-allocate the previously allocated block in __ptr, making the new
068:    block SIZE bytes long.  */
069: /* __attribute_malloc__ is not used, because if realloc returns
070:    the same pointer that was passed to it, aliasing needs to be allowed
071:    between objects pointed by the old and new pointers.  */
072: extern void *realloc (void *__ptr, size_t __size)
073:      __THROW __attribute_warn_unused_result__;
074: 
075: /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
076: extern void free (void *__ptr) __THROW;
077: 
078: /* Free a block allocated by `calloc'. */
079: extern void cfree (void *__ptr) __THROW;
080: 
081: /* Allocate SIZE bytes allocated to ALIGNMENT bytes.  */
082: extern void *memalign (size_t __alignment, size_t __size)
083:      __THROW __attribute_malloc__ __wur;
084: 
085: /* Allocate SIZE bytes on a page boundary.  */
086: extern void *valloc (size_t __size) __THROW __attribute_malloc__ __wur;
087: 
088: /* Equivalent to valloc(minimum-page-that-holds(n)), that is, round up
089:    __size to nearest pagesize. */
090: extern void * pvalloc (size_t __size) __THROW __attribute_malloc__ __wur;
091: 
092: /* Underlying allocation function; successive calls should return
093:    contiguous pieces of memory.  */
094: extern void *(*__morecore) (ptrdiff_t __size);
095: 
096: /* Default value of `__morecore'.  */
097: extern void *__default_morecore (ptrdiff_t __size)
098:      __THROW __attribute_malloc__;
099: 
100: /* SVID2/XPG mallinfo structure */
101: 
102: struct mallinfo
103: {
104:   int arena;    /* non-mmapped space allocated from system */
105:   int ordblks;  /* number of free chunks */
106:   int smblks;   /* number of fastbin blocks */
107:   int hblks;    /* number of mmapped regions */
108:   int hblkhd;   /* space in mmapped regions */
109:   int usmblks;  /* maximum total allocated space */
110:   int fsmblks;  /* space available in freed fastbin blocks */
111:   int uordblks; /* total allocated space */
112:   int fordblks; /* total free space */
113:   int keepcost; /* top-most, releasable (via malloc_trim) space */
114: };
115: 
116: /* Returns a copy of the updated current mallinfo. */
117: extern struct mallinfo mallinfo (void) __THROW;
118: 
119: /* SVID2/XPG mallopt options */
120: #ifndef M_MXFAST
121: # define M_MXFAST  1    /* maximum request size for "fastbins" */
122: #endif
123: #ifndef M_NLBLKS
124: # define M_NLBLKS  2    /* UNUSED in this malloc */
125: #endif
126: #ifndef M_GRAIN
127: # define M_GRAIN   3    /* UNUSED in this malloc */
128: #endif
129: #ifndef M_KEEP
130: # define M_KEEP    4    /* UNUSED in this malloc */
131: #endif
132: 
133: /* mallopt options that actually do something */
134: #define M_TRIM_THRESHOLD    -1
135: #define M_TOP_PAD           -2
136: #define M_MMAP_THRESHOLD    -3
137: #define M_MMAP_MAX          -4
138: #define M_CHECK_ACTION      -5
139: #define M_PERTURB           -6
140: #define M_ARENA_TEST        -7
141: #define M_ARENA_MAX         -8
142: 
143: /* General SVID/XPG interface to tunable parameters. */
144: extern int mallopt (int __param, int __val) __THROW;
145: 
146: /* Release all but __pad bytes of freed top-most memory back to the
147:    system. Return 1 if successful, else 0. */
148: extern int malloc_trim (size_t __pad) __THROW;
149: 
150: /* Report the number of usable allocated bytes associated with allocated
151:    chunk __ptr. */
152: extern size_t malloc_usable_size (void *__ptr) __THROW;
153: 
154: /* Prints brief summary statistics on stderr. */
155: extern void malloc_stats (void) __THROW;
156: 
157: /* Output information about state of allocator to stream FP.  */
158: extern int malloc_info (int __options, FILE *__fp) __THROW;
159: 
160: /* Record the state of all malloc variables in an opaque data structure. */
161: extern void *malloc_get_state (void) __THROW;
162: 
163: /* Restore the state of all malloc variables from data obtained with
164:    malloc_get_state(). */
165: extern int malloc_set_state (void *__ptr) __THROW;
166: 
167: /* Called once when malloc is initialized; redefining this variable in
168:    the application provides the preferred way to set up the hook
169:    pointers. */
170: extern void (*__MALLOC_HOOK_VOLATILE __malloc_initialize_hook) (void)
171:      __MALLOC_DEPRECATED;
172: /* Hooks for debugging and user-defined versions. */
173: extern void (*__MALLOC_HOOK_VOLATILE __free_hook) (void *__ptr,
174:                                                    __const __malloc_ptr_t)
175:      __MALLOC_DEPRECATED;
176: extern void *(*__MALLOC_HOOK_VOLATILE __malloc_hook) (size_t __size,
177:                                                       __const __malloc_ptr_t)
178:      __MALLOC_DEPRECATED;
179: extern void *(*__MALLOC_HOOK_VOLATILE __realloc_hook) (void *__ptr,
180:                                                        size_t __size,
181:                                                        __const __malloc_ptr_t)
182:      __MALLOC_DEPRECATED;
183: extern void *(*__MALLOC_HOOK_VOLATILE __memalign_hook) (size_t __alignment,
184:                                                         size_t __size,
185:                                                         __const __malloc_ptr_t)
186:      __MALLOC_DEPRECATED;
187: extern void (*__MALLOC_HOOK_VOLATILE __after_morecore_hook) (void);
188: 
189: /* Activate a standard set of debugging hooks. */
190: extern void __malloc_check_init (void) __THROW __MALLOC_DEPRECATED;
191: 
192: 
193: __END_DECLS
194: 
195: #endif /* malloc.h */
196: 

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