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 28 typedef ::unix_file::FdFile File; 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_ 64
