1 /* 2 * Copyright (c) 2022 Huawei Device Co., Ltd. 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 16 #ifndef OHOS_MEMORY_MEMMGR_COMMON_INCLUDE_KERNEL_INTERFACE_H 17 #define OHOS_MEMORY_MEMMGR_COMMON_INCLUDE_KERNEL_INTERFACE_H 18 19 #include <fcntl.h> 20 #include <map> 21 #include <string> 22 #include <sys/types.h> 23 #include <vector> 24 25 #include "single_instance.h" 26 27 namespace OHOS { 28 namespace Memory { 29 #define PAGE_TO_KB 4 30 #define KB_PER_MB 1024 31 #define MAX_BUFFER_KB 0x7fffffff 32 33 struct ProcInfo { 34 int tgid; 35 int pid; 36 int pidfd; 37 int size; 38 std::string name; 39 std::string status; 40 }; 41 42 class KernelInterface { 43 DECLARE_SINGLE_INSTANCE(KernelInterface); 44 45 public: 46 bool EchoToPath(const char* path, const char* content); 47 48 // file operations 49 bool IsFileExists(const std::string& path); 50 bool CreateFile(const std::string& path); // default mode 644(-rw-r--r--) 51 bool CreateFile(const std::string& path, const mode_t& mode); 52 bool RemoveFile(const std::string& path); 53 bool WriteToFile(const std::string& path, const std::string& content, bool truncated = true); 54 bool ReadFromFile(const std::string& path, std::string& content); 55 bool ReadLinesFromFile(const std::string& path, std::vector<std::string>& lines); 56 // dir operations 57 bool IsDirExists(const std::string& path); 58 bool IsExists(const std::string& path); // file or dir 59 bool IsEmptyDir(const std::string& path); 60 bool CreateDir(const std::string& path); // create dir recursively 755 61 bool RemoveDirRecursively(const std::string& path); 62 std::string AddDelimiter(const std::string& path); // IncludeTrailingPathDelimiter 63 std::string RmDelimiter(const std::string& path); // ExcludeTrailingPathDelimiter 64 std::string JoinPath(const std::string& prefixPath, const std::string& subPath); 65 std::string JoinPath(const std::string& prefixPath, const std::string& midPath, const std::string& subPath); 66 67 void SplitOneLineByDelim(const std::string &input, const char delimiter, std::vector<std::string> &res); 68 void SplitOneLineByBlank(const std::string &input, std::vector<std::string> &res); 69 70 bool GetPidProcInfo(struct ProcInfo &procInfo); 71 bool GetProcNameByPid(int pid, std::string &name); 72 void ReadZswapdPressureShow(std::map<std::string, std::string>& result); 73 int GetCurrentBuffer(); 74 int KillOneProcessByPid(int pid); 75 bool GetAllProcPids(std::vector<unsigned int>& pids); 76 bool GetUidByPid(unsigned int pid, unsigned int& uid); 77 bool ReadSwapOutKBSinceKernelBoot(const std::string &path, const std::string &tagStr, unsigned long long &ret); 78 int64_t GetSystemCurTime(); 79 int64_t GetSystemTimeMs(); 80 81 int GetTotalBuffer(); 82 bool GetMemcgPids(const std::string &memcgPath, std::vector<int> &memcgPids); 83 bool GetAllUserIds(std::vector<int> &userIds); 84 85 static const std::string ROOT_PROC_PATH; 86 static const std::string MEMCG_BASE_PATH; 87 static const std::string FILE_MEMCG_PROCS; 88 static const std::string ZWAPD_PRESSURE_SHOW_PATH; 89 static const std::string ZWAPD_PRESSURE_SHOW_BUFFER_SIZE; 90 static const std::string MEMINFO_PATH; 91 static const std::string FILE_PROC_STATUS; 92 static const std::string TOTAL_MEMORY; 93 94 static constexpr mode_t FILE_MODE_666 = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH; // -rw-rw-rw-- 95 static constexpr mode_t FILE_MODE_664 = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH; // -rw-rw-r-- 96 static constexpr mode_t FILE_MODE_644 = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // -rw-r--r-- 97 static constexpr mode_t FILE_MODE_660 = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; 98 static constexpr mode_t FILE_MODE_755 = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH; 99 static constexpr mode_t FILE_MODE_775 = S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH; 100 static constexpr mode_t FILE_MODE_770 = S_IRWXU | S_IRWXG; 101 static constexpr mode_t FILE_MODE_700 = S_IRWXU; 102 private: 103 int ParseMeminfo(const std::string &contentStr, const std::string &itemName); 104 105 int totalBuffer_ = -1; 106 }; 107 } // namespace Memory 108 } // namespace OHOS 109 #endif // OHOS_MEMORY_MEMMGR_COMMON_INCLUDE_KERNEL_INTERFACE_H 110