1/*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ART_RUNTIME_OS_H_
18#define ART_RUNTIME_OS_H_
19
20namespace unix_file {
21class FdFile;
22}  // namespace unix_file
23
24namespace art {
25
26typedef ::unix_file::FdFile File;
27
28// Interface to the underlying OS platform.
29
30class OS {
31 public:
32  // Open an existing file with read only access.
33  static File* OpenFileForReading(const char* name);
34
35  // Open an existing file with read/write access.
36  static File* OpenFileReadWrite(const char* name);
37
38  // Create an empty file with read/write access. This is a *new* file, that is, if the file
39  // already exists, it is *not* overwritten, but unlinked, and a new inode will be used.
40  static File* CreateEmptyFile(const char* name);
41
42  // Create an empty file with write access. This is a *new* file, that is, if the file
43  // already exists, it is *not* overwritten, but unlinked, and a new inode will be used.
44  static File* CreateEmptyFileWriteOnly(const char* name);
45
46  // Open a file with the specified open(2) flags.
47  static File* OpenFileWithFlags(const char* name, int flags);
48
49  // Check if a file exists.
50  static bool FileExists(const char* name);
51
52  // Check if a directory exists.
53  static bool DirectoryExists(const char* name);
54};
55
56}  // namespace art
57
58#endif  // ART_RUNTIME_OS_H_
59