1 // Copyright (C) 2018 The Android Open Source Project 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef IORAP_SRC_INODE2FILENAME_SYSTEM_CALL_H_ 16 #define IORAP_SRC_INODE2FILENAME_SYSTEM_CALL_H_ 17 18 #include <fruit/fruit.h> 19 20 #include <dirent.h> 21 #include <sys/types.h> 22 #include <sys/stat.h> 23 #include <unistd.h> 24 25 // Abstract out the system calls behind a virtual interface: 26 // This enables us to use dependency injection to provide mock implementations 27 // during tests. 28 struct SystemCall { 29 // stat(2) 30 virtual int stat(const char *pathname, struct stat *statbuf) = 0; 31 32 // opendir(3) 33 virtual DIR *opendir(const char *name) = 0; 34 35 // readdir(3) 36 virtual struct dirent *readdir(DIR *dirp) = 0; 37 38 // closedir(3) 39 virtual int closedir(DIR *dirp) = 0; 40 ~SystemCallSystemCall41 virtual ~SystemCall() {} 42 }; 43 44 // "Live" implementation that calls down to libc. 45 struct SystemCallImpl : public SystemCall { 46 // Marks this constructor as the one to use for injection. 47 INJECT(SystemCallImpl()) = default; 48 49 // stat(2) statSystemCallImpl50 virtual int stat(const char *pathname, struct stat *statbuf) override { 51 return ::stat(pathname, statbuf); 52 } 53 54 // opendir(3) opendirSystemCallImpl55 virtual DIR *opendir(const char *name) override { 56 return ::opendir(name); 57 } 58 59 // readdir(3) readdirSystemCallImpl60 virtual struct dirent *readdir(DIR *dirp) override { 61 return ::readdir(dirp); 62 } 63 64 // closedir(3) closedirSystemCallImpl65 virtual int closedir(DIR *dirp) override { 66 return ::closedir(dirp); 67 } 68 ~SystemCallImplSystemCallImpl69 virtual ~SystemCallImpl() {} 70 }; 71 72 #endif // IORAP_SRC_INODE2FILENAME_SYSTEM_CALL_H_ 73 74