/usr/include/hphp/util/shm-counter.h is in hhvm-dev 3.11.1+dfsg-1ubuntu1.
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  | /*
   +----------------------------------------------------------------------+
   | HipHop for PHP                                                       |
   +----------------------------------------------------------------------+
   | Copyright (c) 2010-2015 Facebook, Inc. (http://www.facebook.com)     |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.php.net/license/3_01.txt                                  |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
*/
#ifndef incl_HPHP_SHM_COUNTER_H_
#define incl_HPHP_SHM_COUNTER_H_
#include <string.h>
// #define ENABLE_SHM_COUNTER
#define SHM_COUNTER_KEY 768
#define SHM_COUNTER_DEF(n) ShmCounter n;
#define SHM_COUNTER_INI(n) n(#n),
namespace HPHP {
///////////////////////////////////////////////////////////////////////////////
class ShmCounter {
public:
  ShmCounter() {}
  explicit ShmCounter(const char *n) : count(0) {
    size_t size = sizeof(name);
    strncpy(name, n, size);
    name[size - 1] = '\0';
  }
  void dump();
  char name[64];
  long long count;
};
class ShmCounters {
public:
  SHM_COUNTER_DEF(dummy_def1)
  SHM_COUNTER_DEF(dummy_def2)
  // Add your real counter definition here
  SHM_COUNTER_DEF(dummy_defmax)
ShmCounters() :
  SHM_COUNTER_INI(dummy_def1)
  SHM_COUNTER_INI(dummy_def2)
  // Add your real counter initialization here
  dummy_defmax("dummy_defmax")
  {}
~ShmCounters();
  typedef void (*logError_t)(const char *fmt, ...);
  static bool initialize(bool create, logError_t logError = nullptr);
  static void dump();
public:
  static bool created;
  static int shmid;
  static logError_t logError;
  static ShmCounters *s_shmCounters;
};
///////////////////////////////////////////////////////////////////////////////
}
#endif // incl_HPHP_SHM_COUNTER_H_
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