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System Structure (system call (API (parameter (type, order), return value,…

- - - - use service
        
        程式編號
        
        program sequence call
        
        by Os
  - - - type
      - order
  - - - 創刪 process
      - load/execute
      - proccess attribute
        
        get
        
        set
      - event
        
        wait
        
        signal
        
        observer
      - memory
        
        allocate
        
        free
    - - create/delete file
      - open/close
      - read/write/reposition
      - file attribute
        
        method
        
        get
        
        set
        
        access controll
        
        chmod 755
    - - request/release
      - read/write/reposition
      - device attribute
        
        method
        
        get
        
        set
      - logically attach/dettach
  - - - 少量
    - - address in register
      - 起始address
        
        block
        
        table
    - - PCB 結構
- - - - 程式執行
      - I/O操作
      - accounting
        
        記名簿
        
        Resource :arrow_right: 誰用
      - 資源配置
      - file system
      - error detection
        
        編碼 :arrow_right: 錯誤
      - communication
        
        訊息交流
        
        共用信箱
        
        shared memory
        
        messaging passing
      - user interface
        
        Command Line Interface
        
        GUI
        
        touch-screen interface
    - - OS上有效操作
      - multiple
        
        sharing
        
        資源配置
        
        logging
        
        state 紀錄
        
        修正
        
        追蹤
        
        protection
        
        資源分配衝突防治
        
        security
        
        內外攻擊防治