This file is indexed.

/usr/include/gperftools/malloc_hook.h is in libgoogle-perftools-dev 2.2.1-0.2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
// Copyright (c) 2005, Google Inc.
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// 
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// ---
// Author: Sanjay Ghemawat
//
// Some of our malloc implementations can invoke the following hooks whenever
// memory is allocated or deallocated.  MallocHook is thread-safe, and things
// you do before calling AddFooHook(MyHook) are visible to any resulting calls
// to MyHook.  Hooks must be thread-safe.  If you write:
//
//   CHECK(MallocHook::AddNewHook(&MyNewHook));
//
// MyNewHook will be invoked in subsequent calls in the current thread, but
// there are no guarantees on when it might be invoked in other threads.
//
// There are a limited number of slots available for each hook type.  Add*Hook
// will return false if there are no slots available.  Remove*Hook will return
// false if the given hook was not already installed.
//
// The order in which individual hooks are called in Invoke*Hook is undefined.
//
// It is safe for a hook to remove itself within Invoke*Hook and add other
// hooks.  Any hooks added inside a hook invocation (for the same hook type)
// will not be invoked for the current invocation.
//
// One important user of these hooks is the heap profiler.
//
// CAVEAT: If you add new MallocHook::Invoke* calls then those calls must be
// directly in the code of the (de)allocation function that is provided to the
// user and that function must have an ATTRIBUTE_SECTION(malloc_hook) attribute.
//
// Note: the Invoke*Hook() functions are defined in malloc_hook-inl.h.  If you
// need to invoke a hook (which you shouldn't unless you're part of tcmalloc),
// be sure to #include malloc_hook-inl.h in addition to malloc_hook.h.
//
// NOTE FOR C USERS: If you want to use malloc_hook functionality from
// a C program, #include malloc_hook_c.h instead of this file.

#ifndef _MALLOC_HOOK_H_
#define _MALLOC_HOOK_H_

#include <stddef.h>
#include <sys/types.h>
extern "C" {
#include <gperftools/malloc_hook_c.h>  // a C version of the malloc_hook interface
}

// Annoying stuff for windows -- makes sure clients can import these functions
#ifndef PERFTOOLS_DLL_DECL
# ifdef _WIN32
#   define PERFTOOLS_DLL_DECL  __declspec(dllimport)
# else
#   define PERFTOOLS_DLL_DECL
# endif
#endif

// The C++ methods below call the C version (MallocHook_*), and thus
// convert between an int and a bool.  Windows complains about this
// (a "performance warning") which we don't care about, so we suppress.
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable:4800)
#endif

// Note: malloc_hook_c.h defines MallocHook_*Hook and
// MallocHook_{Add,Remove}*Hook.  The version of these inside the MallocHook
// class are defined in terms of the malloc_hook_c version.  See malloc_hook_c.h
// for details of these types/functions.

class PERFTOOLS_DLL_DECL MallocHook {
 public:
  // The NewHook is invoked whenever an object is allocated.
  // It may be passed NULL if the allocator returned NULL.
  typedef MallocHook_NewHook NewHook;
  inline static bool AddNewHook(NewHook hook) {
    return MallocHook_AddNewHook(hook);
  }
  inline static bool RemoveNewHook(NewHook hook) {
    return MallocHook_RemoveNewHook(hook);
  }
  inline static void InvokeNewHook(const void* p, size_t s);

  // The DeleteHook is invoked whenever an object is deallocated.
  // It may be passed NULL if the caller is trying to delete NULL.
  typedef MallocHook_DeleteHook DeleteHook;
  inline static bool AddDeleteHook(DeleteHook hook) {
    return MallocHook_AddDeleteHook(hook);
  }
  inline static bool RemoveDeleteHook(DeleteHook hook) {
    return MallocHook_RemoveDeleteHook(hook);
  }
  inline static void InvokeDeleteHook(const void* p);

  // The PreMmapHook is invoked with mmap or mmap64 arguments just
  // before the call is actually made.  Such a hook may be useful
  // in memory limited contexts, to catch allocations that will exceed
  // a memory limit, and take outside actions to increase that limit.
  typedef MallocHook_PreMmapHook PreMmapHook;
  inline static bool AddPreMmapHook(PreMmapHook hook) {
    return MallocHook_AddPreMmapHook(hook);
  }
  inline static bool RemovePreMmapHook(PreMmapHook hook) {
    return MallocHook_RemovePreMmapHook(hook);
  }
  inline static void InvokePreMmapHook(const void* start,
                                       size_t size,
                                       int protection,
                                       int flags,
                                       int fd,
                                       off_t offset);

  // The MmapReplacement is invoked after the PreMmapHook but before
  // the call is actually made. The MmapReplacement should return true
  // if it handled the call, or false if it is still necessary to
  // call mmap/mmap64.
  // This should be used only by experts, and users must be be
  // extremely careful to avoid recursive calls to mmap. The replacement
  // should be async signal safe.
  // Only one MmapReplacement is supported. After setting an MmapReplacement
  // you must call RemoveMmapReplacement before calling SetMmapReplacement
  // again.
  typedef MallocHook_MmapReplacement MmapReplacement;
  inline static bool SetMmapReplacement(MmapReplacement hook) {
    return MallocHook_SetMmapReplacement(hook);
  }
  inline static bool RemoveMmapReplacement(MmapReplacement hook) {
    return MallocHook_RemoveMmapReplacement(hook);
  }
  inline static bool InvokeMmapReplacement(const void* start,
                                           size_t size,
                                           int protection,
                                           int flags,
                                           int fd,
                                           off_t offset,
                                           void** result);


  // The MmapHook is invoked whenever a region of memory is mapped.
  // It may be passed MAP_FAILED if the mmap failed.
  typedef MallocHook_MmapHook MmapHook;
  inline static bool AddMmapHook(MmapHook hook) {
    return MallocHook_AddMmapHook(hook);
  }
  inline static bool RemoveMmapHook(MmapHook hook) {
    return MallocHook_RemoveMmapHook(hook);
  }
  inline static void InvokeMmapHook(const void* result,
                                    const void* start,
                                    size_t size,
                                    int protection,
                                    int flags,
                                    int fd,
                                    off_t offset);

  // The MunmapReplacement is invoked with munmap arguments just before
  // the call is actually made. The MunmapReplacement should return true
  // if it handled the call, or false if it is still necessary to
  // call munmap.
  // This should be used only by experts. The replacement should be
  // async signal safe.
  // Only one MunmapReplacement is supported. After setting an
  // MunmapReplacement you must call RemoveMunmapReplacement before
  // calling SetMunmapReplacement again.
  typedef MallocHook_MunmapReplacement MunmapReplacement;
  inline static bool SetMunmapReplacement(MunmapReplacement hook) {
    return MallocHook_SetMunmapReplacement(hook);
  }
  inline static bool RemoveMunmapReplacement(MunmapReplacement hook) {
    return MallocHook_RemoveMunmapReplacement(hook);
  }
  inline static bool InvokeMunmapReplacement(const void* p,
                                             size_t size,
                                             int* result);

  // The MunmapHook is invoked whenever a region of memory is unmapped.
  typedef MallocHook_MunmapHook MunmapHook;
  inline static bool AddMunmapHook(MunmapHook hook) {
    return MallocHook_AddMunmapHook(hook);
  }
  inline static bool RemoveMunmapHook(MunmapHook hook) {
    return MallocHook_RemoveMunmapHook(hook);
  }
  inline static void InvokeMunmapHook(const void* p, size_t size);

  // The MremapHook is invoked whenever a region of memory is remapped.
  typedef MallocHook_MremapHook MremapHook;
  inline static bool AddMremapHook(MremapHook hook) {
    return MallocHook_AddMremapHook(hook);
  }
  inline static bool RemoveMremapHook(MremapHook hook) {
    return MallocHook_RemoveMremapHook(hook);
  }
  inline static void InvokeMremapHook(const void* result,
                                      const void* old_addr,
                                      size_t old_size,
                                      size_t new_size,
                                      int flags,
                                      const void* new_addr);

  // The PreSbrkHook is invoked just before sbrk is called -- except when
  // the increment is 0.  This is because sbrk(0) is often called
  // to get the top of the memory stack, and is not actually a
  // memory-allocation call.  It may be useful in memory-limited contexts,
  // to catch allocations that will exceed the limit and take outside
  // actions to increase such a limit.
  typedef MallocHook_PreSbrkHook PreSbrkHook;
  inline static bool AddPreSbrkHook(PreSbrkHook hook) {
    return MallocHook_AddPreSbrkHook(hook);
  }
  inline static bool RemovePreSbrkHook(PreSbrkHook hook) {
    return MallocHook_RemovePreSbrkHook(hook);
  }
  inline static void InvokePreSbrkHook(ptrdiff_t increment);

  // The SbrkHook is invoked whenever sbrk is called -- except when
  // the increment is 0.  This is because sbrk(0) is often called
  // to get the top of the memory stack, and is not actually a
  // memory-allocation call.
  typedef MallocHook_SbrkHook SbrkHook;
  inline static bool AddSbrkHook(SbrkHook hook) {
    return MallocHook_AddSbrkHook(hook);
  }
  inline static bool RemoveSbrkHook(SbrkHook hook) {
    return MallocHook_RemoveSbrkHook(hook);
  }
  inline static void InvokeSbrkHook(const void* result, ptrdiff_t increment);

  // Get the current stack trace.  Try to skip all routines up to and
  // and including the caller of MallocHook::Invoke*.
  // Use "skip_count" (similarly to GetStackTrace from stacktrace.h)
  // as a hint about how many routines to skip if better information
  // is not available.
  inline static int GetCallerStackTrace(void** result, int max_depth,
                                        int skip_count) {
    return MallocHook_GetCallerStackTrace(result, max_depth, skip_count);
  }

  // Unhooked versions of mmap() and munmap().   These should be used
  // only by experts, since they bypass heapchecking, etc.
  // Note: These do not run hooks, but they still use the MmapReplacement
  // and MunmapReplacement.
  static void* UnhookedMMap(void *start, size_t length, int prot, int flags,
                            int fd, off_t offset);
  static int UnhookedMUnmap(void *start, size_t length);

  // The following are DEPRECATED.
  inline static NewHook GetNewHook();
  inline static NewHook SetNewHook(NewHook hook) {
    return MallocHook_SetNewHook(hook);
  }

  inline static DeleteHook GetDeleteHook();
  inline static DeleteHook SetDeleteHook(DeleteHook hook) {
    return MallocHook_SetDeleteHook(hook);
  }

  inline static PreMmapHook GetPreMmapHook();
  inline static PreMmapHook SetPreMmapHook(PreMmapHook hook) {
    return MallocHook_SetPreMmapHook(hook);
  }

  inline static MmapHook GetMmapHook();
  inline static MmapHook SetMmapHook(MmapHook hook) {
    return MallocHook_SetMmapHook(hook);
  }

  inline static MunmapHook GetMunmapHook();
  inline static MunmapHook SetMunmapHook(MunmapHook hook) {
    return MallocHook_SetMunmapHook(hook);
  }

  inline static MremapHook GetMremapHook();
  inline static MremapHook SetMremapHook(MremapHook hook) {
    return MallocHook_SetMremapHook(hook);
  }

  inline static PreSbrkHook GetPreSbrkHook();
  inline static PreSbrkHook SetPreSbrkHook(PreSbrkHook hook) {
    return MallocHook_SetPreSbrkHook(hook);
  }

  inline static SbrkHook GetSbrkHook();
  inline static SbrkHook SetSbrkHook(SbrkHook hook) {
    return MallocHook_SetSbrkHook(hook);
  }
  // End of DEPRECATED methods.

 private:
  // Slow path versions of Invoke*Hook.
  static void InvokeNewHookSlow(const void* p, size_t s);
  static void InvokeDeleteHookSlow(const void* p);
  static void InvokePreMmapHookSlow(const void* start,
                                    size_t size,
                                    int protection,
                                    int flags,
                                    int fd,
                                    off_t offset);
  static void InvokeMmapHookSlow(const void* result,
                                 const void* start,
                                 size_t size,
                                 int protection,
                                 int flags,
                                 int fd,
                                 off_t offset);
  static bool InvokeMmapReplacementSlow(const void* start,
                                        size_t size,
                                        int protection,
                                        int flags,
                                        int fd,
                                        off_t offset,
                                        void** result);
  static void InvokeMunmapHookSlow(const void* p, size_t size);
  static bool InvokeMunmapReplacementSlow(const void* p,
                                          size_t size,
                                          int* result);
  static void InvokeMremapHookSlow(const void* result,
                                   const void* old_addr,
                                   size_t old_size,
                                   size_t new_size,
                                   int flags,
                                   const void* new_addr);
  static void InvokePreSbrkHookSlow(ptrdiff_t increment);
  static void InvokeSbrkHookSlow(const void* result, ptrdiff_t increment);
};

#ifdef _MSC_VER
#pragma warning(pop)
#endif


#endif /* _MALLOC_HOOK_H_ */