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Pintos Project 2 한국어 설명서 (design report) - User Program, System Call

pintos 2를 한국어로 쉽게 설명해놓은 design 보고서입니다. 방대한 파일의 코드들 중, 어느 부분을 어떻게 고쳐야 할지 관련 개념과 함께 설명되어 있습니다.
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최초등록일 2024.06.15 최종저작일 2023.09
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Pintos Project 2 한국어 설명서 (design report) - User Program, System Call
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    소개

    pintos 2를 한국어로 쉽게 설명해놓은 design 보고서입니다.
    방대한 파일의 코드들 중, 어느 부분을 어떻게 고쳐야 할지 관련 개념과 함께 설명되어 있습니다.

    목차

    0. Analysis
    0.1. Process Execution Procedure
    0.1.1. analysis
    0.2. System Call Procedure
    0.2.1. what is system call
    0.2.2. analysis
    0.3. File System
    0.3.1. what is file descriptor
    0.3.2. analysis

    1. Process terminate messages
    1.1. goal
    1.2. how to solve problems

    2. Argument Passing
    2.1. goal
    2.2. how to solve problems

    3. System Call
    3.1. goal
    3.2. how to solve problems
    3.2.1. data structure
    3.2.2. detailed algorithm
    3.2.3. implement system calls

    4. Denying Writes to Executables
    4.1. goal
    4.2. how to solve problems

    본문내용

    0. Analysis
    project 1에선 kernel에서 실행되는 thread들 위주였다면 project 2에서는 user program을 실행시키는 것이 위주이다. 따라서 project 1에선 alarm clock, priority scheduling, advanced scheduling 등의 코드들이 모두 kernel의 일부였고 해당 코드들을 kernel에서 직접 compile했지만, project 2에선 user program을 이용하여 compile한다. user program을 실행시키기 위하여 구현해야 하는 것은 아래와 같다.
    1. Process terminate messages
    2. Argument passing
    3. System call
    4. Denying writes to executables
    user program은 file system에서 load되고 있고, 많은 system call 구현은 file system에서 다뤄진다.
    0.1. Process Execution Procedure
    0.1.1. analysis
    1. main()
    Process Execution Procedure을 분석하기 위해 먼저 threads/init.c의 main 함수를 보겠다.
    0. Analysis 0.1. Process Execution Procedure
    0.1.1. analysis 0.2. System Call Procedure
    0.2.1. what is system call 0.2.2. analysis 0.3. File System 0.3.1. what is file descriptor 0.3.2. analysis

    참고자료

    · 한양대 pintos 자료, postech pintos 자료

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    • 1. Process Execution Procedure
      The process execution procedure is a fundamental aspect of operating system design and implementation. It involves the steps taken by the operating system to load and execute a program. This includes tasks such as loading the program code and data into memory, allocating resources like CPU time and memory, and managing the execution of the program. Understanding the process execution procedure is crucial for developers and system administrators to optimize system performance, ensure process isolation, and maintain system stability. The specific steps involved may vary across different operating systems, but the general principles remain the same. Efficient process execution is essential for providing a responsive and reliable computing environment for users.
    • 2. System Call Procedure
      The system call procedure is a critical component of modern operating systems, as it provides a mechanism for user-level applications to interact with the kernel and access system resources. This procedure involves the user program making a request to the operating system, which then handles the request and returns the result to the user program. The specific steps involved in the system call procedure can vary across different operating systems, but typically include the user program preparing the necessary parameters, invoking the system call, the kernel processing the request, and the kernel returning the result to the user program. Understanding the system call procedure is essential for developers who need to write applications that interact with the operating system, as well as for system administrators who need to optimize system performance and ensure the security of the system. Efficient and secure system call handling is a critical aspect of modern operating system design.
    • 3. File System
      The file system is a fundamental component of modern operating systems, providing a structured way to organize and manage data stored on storage devices. The file system procedure involves the steps taken by the operating system to create, read, write, and manage files and directories. This includes tasks such as allocating and deallocating storage space, maintaining metadata about files and directories, and providing access control mechanisms. Understanding the file system procedure is crucial for developers who need to write applications that interact with the file system, as well as for system administrators who need to manage and maintain the file system. Efficient and secure file system management is essential for ensuring the reliability and performance of the overall system. Additionally, the file system plays a critical role in data storage and retrieval, making it a key component of modern computing infrastructure.
    • 4. Process terminate messages
      Process terminate messages are an important aspect of operating system design, as they provide information about the status and termination of running processes. These messages can include information such as the reason for termination (e.g., normal completion, user-initiated termination, or system-initiated termination due to an error), the exit status of the process, and any relevant error codes or diagnostic information. Understanding the process terminate messages is crucial for developers and system administrators, as it allows them to monitor the health and behavior of running processes, diagnose and troubleshoot issues, and ensure the overall stability and reliability of the system. Effective handling and interpretation of process terminate messages can also help improve the user experience by providing meaningful feedback and error messages to end-users. Overall, the process terminate messages are an essential component of modern operating system design and play a crucial role in system monitoring, troubleshooting, and maintenance.
    • 5. Argument Passing
      Argument passing is a fundamental concept in computer programming, and it is particularly important in the context of operating systems. When a user or application invokes a system call or executes a program, the operating system needs to be able to receive and process the arguments passed to the call or program. The argument passing procedure involves the user or application preparing the necessary arguments, passing them to the operating system, and the operating system then using those arguments to execute the requested operation. Understanding the argument passing procedure is crucial for developers who need to write applications that interact with the operating system, as well as for system administrators who need to configure and manage system-level processes and services. Efficient and secure argument passing is essential for ensuring the reliability and performance of the overall system, as well as for maintaining the integrity of the operating system and its resources.
    • 6. System Call
      The system call is a fundamental mechanism in modern operating systems that allows user-level applications to interact with the kernel and access system resources. The system call procedure involves the user program making a request to the operating system, which then handles the request and returns the result to the user program. Understanding the system call procedure is crucial for developers who need to write applications that interact with the operating system, as well as for system administrators who need to optimize system performance and ensure the security of the system. Efficient and secure system call handling is a critical aspect of modern operating system design, as it enables applications to leverage the capabilities of the underlying hardware and software infrastructure. Additionally, the system call mechanism plays a key role in providing isolation and protection between user-level applications and the kernel, which is essential for maintaining the overall stability and reliability of the system.
    • 7. Denying Writes to Executables
      Denying writes to executable files is an important security feature in modern operating systems. This procedure involves the operating system preventing user-level applications from modifying the contents of executable files, which are typically used to store the code and instructions that are executed by the system. Preventing writes to executables helps to ensure the integrity of the system, as it protects against malicious modifications that could compromise the security or functionality of the system. Understanding the process of denying writes to executables is crucial for system administrators and security professionals who need to maintain the security and stability of the operating system. This feature is particularly important in environments where multiple users or applications may have access to the same system resources, as it helps to prevent unauthorized changes that could lead to security vulnerabilities or system instability. Overall, the ability to deny writes to executables is a critical component of modern operating system security and plays a key role in protecting the overall system from potential threats.

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