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1. Extending The xv6 Kernel - Adding A ... Extending The xv6 Kernel - Adding A System Call

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   # Extending The xv6 Kernel - Adding A System Call

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   This document show how you can extend the xv6 kernel by a new system call, `getppid()`. We do this by modifying the `syscall.h, syscall.c and sysproc.c`  files in the kernel code and modifying `user.h and usys.S` in the user space code.

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   ## Introduction

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   The xv6 kernel, henceforth referred to as the kernel, is a re-implementation of the unix version 6 kernel. Originally written by Dennis Ritchie and Ken Thompson in 1975 using the C programming language. The kernel targets two architectures: `x86`  and `risc-v` . this document focuses on the `x86` version. Xv6 is an operating system developed in 2006 by MIT for educational purposes. It is used in MIT’s undergraduate course: `CS 6.1810: Operating Systems Engineering` . The complete implementation of xv6 is around 6000 lines of code which makes it ideal to study and understand the main concepts of an (unix) operating system. 

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