Martin Stjernholm | 4fb5111 | 2021-04-30 11:53:52 +0100 | [diff] [blame] | 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_LIBARTBASE_BASE_OS_H_ |
| 18 | #define ART_LIBARTBASE_BASE_OS_H_ |
| 19 | |
| 20 | #include <stdint.h> |
| 21 | |
| 22 | namespace unix_file { |
| 23 | class FdFile; |
| 24 | } // namespace unix_file |
| 25 | |
| 26 | namespace art { |
| 27 | |
android-t1 | 3d2c5b2 | 2022-10-12 13:43:18 +0800 | [diff] [blame] | 28 | using File = ::unix_file::FdFile; |
Martin Stjernholm | 4fb5111 | 2021-04-30 11:53:52 +0100 | [diff] [blame] | 29 | |
| 30 | // Interface to the underlying OS platform. |
| 31 | |
| 32 | class OS { |
| 33 | public: |
| 34 | // Open an existing file with read only access. |
| 35 | static File* OpenFileForReading(const char* name); |
| 36 | |
| 37 | // Open an existing file with read/write access. |
| 38 | static File* OpenFileReadWrite(const char* name); |
| 39 | |
| 40 | // Create an empty file with read/write access. This is a *new* file, that is, if the file |
| 41 | // already exists, it is *not* overwritten, but unlinked, and a new inode will be used. |
| 42 | static File* CreateEmptyFile(const char* name); |
| 43 | |
| 44 | // Create an empty file with write access. This is a *new* file, that is, if the file |
| 45 | // already exists, it is *not* overwritten, but unlinked, and a new inode will be used. |
| 46 | static File* CreateEmptyFileWriteOnly(const char* name); |
| 47 | |
| 48 | // Open a file with the specified open(2) flags. |
| 49 | static File* OpenFileWithFlags(const char* name, int flags, bool auto_flush = true); |
| 50 | |
| 51 | // Check if a file exists. |
| 52 | static bool FileExists(const char* name, bool check_file_type = true); |
| 53 | |
| 54 | // Check if a directory exists. |
| 55 | static bool DirectoryExists(const char* name); |
| 56 | |
| 57 | // Get the size of a file (or -1 if it does not exist). |
| 58 | static int64_t GetFileSizeBytes(const char* name); |
| 59 | }; |
| 60 | |
| 61 | } // namespace art |
| 62 | |
| 63 | #endif // ART_LIBARTBASE_BASE_OS_H_ |