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 20 namespace unix_file { 21 class FdFile; 22 } // namespace unix_file 23 24 namespace art { 25 26 typedef ::unix_file::FdFile File; 27 28 // Interface to the underlying OS platform. 29 30 class 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, bool auto_flush = true); 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