MongoDB  2.7.0
file.h
1 // file.h cross platform basic file class. supports 64 bit offsets and such.
2 
3 /* Copyright 2009 10gen Inc.
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #pragma once
19 
20 #include <string>
21 
22 #include "mongo/platform/basic.h"
23 #include "mongo/platform/cstdint.h"
24 
25 namespace mongo {
26 
27  typedef uint64_t fileofs;
28 
29  // NOTE: not thread-safe. (at least the windows implementation isn't)
30 
31  class File {
32 
33  public:
34  File();
35  ~File();
36 
37  bool bad() const { return _bad; }
38  void fsync() const;
39  bool is_open() const;
40  fileofs len();
41  void open(const char* filename, bool readOnly = false, bool direct = false);
42  void read(fileofs o, char* data, unsigned len);
43  void truncate(fileofs size);
44  void write(fileofs o, const char* data, unsigned len);
45 
46  static intmax_t freeSpace(const std::string& path);
47 
48  private:
49  bool _bad;
50 #ifdef _WIN32
51  HANDLE _handle;
52 #else
53  int _fd;
54 #endif
55  std::string _name;
56 
57  };
58 
59 }
Definition: file.h:31