This file is indexed.

/usr/include/jellyfish/mapped_file.hpp is in libjellyfish-2.0-dev 2.2.4-2.

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
/*  This file is part of Jellyfish.

    Jellyfish is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Jellyfish 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Jellyfish.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef __JELLYFISH_MAPPED_FILE_HPP__
#define __JELLYFISH_MAPPED_FILE_HPP__

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <vector>
#include <errno.h>
#include <iostream>

#include <jellyfish/err.hpp>

namespace jellyfish {
class mapped_file {
protected:
  std::string  _path;
  char        *_base, *_end;
  size_t       _length;

  void map_(int fd) {
    struct stat stat;
    if(fstat(fd, &stat) < 0)
      throw ErrorMMap(err::msg() << "Can't stat file '" << _path << "'" << err::no);

    _length = stat.st_size;
    _base = (char*)mmap(NULL, _length, PROT_READ, MAP_SHARED, fd, 0);
    if(_base == MAP_FAILED) {
      _base = 0;
      throw ErrorMMap(err::msg() << "Can't mmap file '" << _path << "'" << err::no);
    }
    _end = _base + _length;
  }

  void map_(const char *filename) {
    int fd = open(filename, O_RDONLY);
    if(fd < 0)
      throw ErrorMMap(err::msg() << "Can't open file '" << filename << "'" << err::no);
    map_(fd);
    close(fd);
  }


public:
  define_error_class(ErrorMMap);
  mapped_file() : _path(), _base(0), _end(0), _length(0) { }
  explicit mapped_file(const char *filename)
  : _path(filename), _base(0), _end(0), _length(0)
  {
    map_(filename);
  }
  explicit mapped_file(int fd)
  : _path(), _base(0), _end(0), _length()
  {
    map_(fd);
  }
  mapped_file(mapped_file&& rhs)
  : _path(std::move(rhs._path)), _base(rhs._base), _end(rhs._end),
    _length(rhs._length)
  {
    rhs._base = 0;
  }

  ~mapped_file() {
    unmap();
  }

  void map(const char* filename) {
    unmap();
    map_(filename);
  }

  void map(int fd) {
    unmap();
    map_(fd);
  }

  void unmap() {
    if(!_base)
      return;
    munmap(_base, _length);
    _path.clear();
    _base   = 0;
    _length = 0;
  }

  mapped_file& operator=(mapped_file&& rhs) {
    _path     = std::move(rhs._path);
    _base     = rhs._base;
    rhs._base = 0;
    _end      = rhs._end;
    _length   = rhs._length;
    return *this;
  }

  void swap(mapped_file& rhs) {
    std::swap(_path, rhs._path);
    std::swap(_base, rhs._base);
    std::swap(_end, rhs._end);
    std::swap(_length, rhs._length);
  }

  char *base() const { return _base; }
  char *end() const { return _end; }
  size_t length() const { return _length; }
  std::string path() const { return _path; }

  // No error checking here. Should I throw something?
  const mapped_file & will_need() const {
    madvise(_base, _length, MADV_WILLNEED);
    return *this;
  }
  const mapped_file & sequential() const {
    madvise(_base, _length, MADV_SEQUENTIAL);
    return *this;
  }
  const mapped_file & random() const {
    madvise(_base, _length, MADV_RANDOM);
    return *this;
  }
  const mapped_file & lock() const {
    if(mlock(_base, _length) < 0)
      throw ErrorMMap(err::msg() << "Can't lock map in memory" << err::no);
    return *this;
  }

  char load() const {
    const long    sz     = sysconf(_SC_PAGESIZE);
    // Do not optimize. Side effect is that every page is accessed and
    // should now be in cache.
    volatile char unused = 0;
    for(const char *w = _base; w < _base + _length; w += sz)
      unused ^= *w;
    return unused;
  }
};
inline void swap(mapped_file& a, mapped_file& b) { a.swap(b); }

// class mapped_files_t : public std::vector<mapped_file> {
// public:
//   mapped_files_t(int nb_files, char *argv[]) {
//     for(int j = 0; j < nb_files; j++)
//       push_back(mapped_file(argv[j]));
//   }

//   mapped_files_t(int nb_files, char *argv[], bool sequential) {
//     for(int j = 0; j < nb_files; j++) {
//       push_back(mapped_file(argv[j]));
//       if(sequential)
//         end()->sequential();
//     }
//   }
// };

// // File mapped on demand.
// class lazy_mapped_file_t : public mapped_file {
//   std::string       _path;
//   volatile bool     done;
//   volatile long     used_counter;

// public:
//   explicit lazy_mapped_file_t(const char *path) :
//     mapped_file((char *)0, (size_t)0),
//     _path(path), done(false), used_counter(0) {}

//   void map() {
//     used_counter = 1;
//     done = false;
//     mapped_file::map(_path.c_str());
//   }
//   void unmap() {
//     done = true;
//     dec();
//   }

//   void inc() {
//     atomic::gcc::fetch_add(&used_counter, (long)1);
//   }
//   void dec() {
//     long val = atomic::gcc::add_fetch(&used_counter, (long)-1);
//     if(done && val == 0)
//       mapped_file::unmap();
//   }
// };

// class lazy_mapped_files_t : public std::vector<lazy_mapped_file_t> {
// public:
//   lazy_mapped_files_t(int nb_files, char *argv[]) {
//     for(int j = 0; j < nb_files; j++)
//       push_back(lazy_mapped_file_t(argv[j]));
//   }

//   lazy_mapped_files_t(int nb_files, char *argv[], bool sequential) {
//     for(int j = 0; j < nb_files; j++) {
//       push_back(lazy_mapped_file_t(argv[j]));
//       if(sequential)
//         end()->sequential();
//     }
//   }
// };

}
#endif