This is a guest post from james morris, the linux kernel security subsystem maintainer and manager of the mainline linux kernel development team at oracle. The linux kernel module programming guide is a free book. Legacy video4linux api version 1 video4linux api version 1 is obsolete and not supported by the kernel. Well start with a brief overview of traditional unix security, and the. The kernel offers a wide variety of interfaces to support the development of device drivers. The linuxusb host side api the linux kernel documentation. Attendees are the main maintainers and developers of the linux networking subsystem. The linux kernel module programming guide lkmpg was originally written by ori pomerantz. Pdf k42 is an opensource research kernel targeted for 64 bit cachecoherent multiprocessor systems. The linux kernel uses sphinx to generate pretty documentation from. The sphinx c domain name c is suited for documentation of c api.
Linux kernel switch asic offload support networking community and maintainer new abstractions. Netconf is a linux community conference, byinvitationonly, running for the seventh year. The linux programming interface is a comprehensive reference to the linux api for experienced system programmers, as well as an introductory guide to these lowlevel interfaces for. Besides the sound device drivers, alsa also bundles a user space library for application developers who want to use driver features with a higher level api than direct. Pdf providing a linux api on the scalable k42 kernel. Nor is it a guide to developing drivers or a reference on the kernel api. The linux api is the kerneluser space api, which allows programs in user space to access system resources and services of the linux kernel. The announcement was made by linus in 1991 on the newsgroups comp. Xml source for the book is hosted in the cvs here at sourceforge. Wikipedia article about the linux kernel some history and background.
These data types are used throughout usb, and in apis including this host side api, gadget apis, and usbfs. This underdevelopment manual will, some glorious day, provide comprehensive information on how the linux virtual filesystem vfs layer works, along with the filesystems that sit below it. Drm developers are perfectly fine if closedsource blob drivers in userspace use the same uapi as the open drivers, but they must do so in the exact same way as the open drivers. The linux kernel has a rich and modular cryptographic api that is used extensively by familiar user facing software such as android. Here you can find the latest docbooks generated from the linux kernel source. The advanced linux sound architecture alsa is a linux kernel component which replaced the original open sound system ossv3 for providing device drivers for sound cards. You can also get changes from people modifying internal kernel apis. Userland interfaces the linux kernel documentation.
Kernel documentation, like the kernel itself, is very much a work in progress. We call this work the architecture of the linux kernel and target commercial developers and potential participants in linux development. Introduction a kernel runs in the protected mode of cpu. Introduction mac80211 is a subsystem to the linux kernel implements shared code for softmachalfmac wireless devices contains mlme and other code, despite the name. After all, the linux kernel is a fast moving target. The methodology is designed to allow incremental updates. A dynamic voltage and current regulator control interface. Android internals wall poster linux kernel development 3rd edition, 2010 the linux programming interface, 2010 linux man. With 1552 pages, 115 diagrams, 88 tables, nearly 200 example programs, and over 200 exercises, tlpi is the most comprehensive description of linux and unix system. Permission is granted to copy, distribute andor modify this document under the terms of the gnu free documentation license, version 1.
This documentation outlines the linux kernel crypto api with its concepts, details about developing cipher implementations, employment of the api for cryptographic use cases, as well as programming examples. What is the difference between shell, kernel and api stack. Applies to both voltage regulators where voltage output is controllable. The linux kernel api the linux kernel documentation. Linux security modules the linux security modules lsm api implements hooks at all securitycritical points within the kernel. It is not possible for user space applications to access kernel data structures and functions directly. To build the documentation in html or pdf formats, use make htmldocs or make pdfdocs.
The hidden world of crypto the linux cryptography api. It became very popular as being the best free way to learn how to program linux kernel modules. Socketcan the official can api of the linux kernel marc kleinebudde, pengutronix socketcan, the official can api of the linux kernel, has been included in the kernel more than 3 years ago. Concurrency managed workqueue cmwq linux generic irq handling. The linux kernel documentation this is the top level of the kernel s documentation tree.
The linux api is the kernel user space api, which allows programs in user space to access system resources and services of the linux kernel. The linux kernel api, the application programming interface api through which user programs interact with the kernel, is meant to be very stable and to not break userspace programs some programs, such as those with guis, rely on other apis as well. Introduction to linux kernel driver programming the linux kernel device model. It is not a linebyline commentary of the kernel source. The linux driver implementers api guide the linux kernel 4. Graphics drivers in the kernel may make use of drm functions to make tasks like memory management, interrupt handling and dma easier, and provide a uniform. Introduction the linux kernel uses sphinx to generate pretty documentation from restructuredtext files under documentation. Jan 21, 2017 basic ubuntu kernel programming tutorial. Linux kernel teaching this is a collection of lectures and labs linux kernel topics.
Anatomy of the linux kernel short and valuable introduction to internals of the kernel. Linux kernel and driver development training linux kernel bootlin. Life got busy, and ori no longer had time or inclination to maintain the document. Linux kernel teaching the linux kernel documentation. It is made up of the system call interface and the subroutines from the gnu c library. One per board to support in the linux kernel advantage. The linux programming interface published in october 2010, no starch press, isbn 9781593272203 is a detailed guide and reference for linux and unix system programming with 1552 pages, 115 diagrams, 88 tables, nearly 200 example programs, and over 200 exercises, tlpi is the most comprehensive description of linux and unix system programming available. Wireless extensions is now in maintenance mode, no new features will be added to it, well only fix bugs for it. The linux driver implementers api guide the linux kernel archives. Booting the linux ppc kernel without open firmware in kernel. Legacy video4linux api version 1 video4linux api version 1 is obsolete and not supported by the kernel anymore. The lectures focus on theoretical and linux kernel exploration. This document is an only somewhat organized collection of some of those interfaces it will hopefully get better over time. Designed to provide a standard kernel interface to control voltage and current regulators.
In this article, well take a highlevel look at the security features of the linux kernel. Provides an api to register and implement device drivers here usb device drivers. Two distinct application programming interface api exist. Kernel users of the cryptographic api include the ipsec code, disk encryption schemes including ecryptfs and dmcrypt, and kernel module signature verification. Core api documentation the linux kernel documentation. Allow systems to dynamically control regulator power output in order to save power and prolong battery life. Provides an api to register and implement adapter drivers here usb controllers, able to detect the connected devices and allowing to communicate with them. This book is for linux enthusiasts who want to know how the linux kernel works. Mylibbooksunderstanding the linux kernel 3rd edition. The request to these calls are also handled by kernel. The current standards specify only an application programming interface apithat is, a welldefined environment in which. Interactive linux kernel map and poster have a look at linux kernel source from a birds eye view. A flow api for linux hardware devices john fastabend intel portland, oregon, usa john. What is the difference between shell, kernel and api.
The linux kernel module programming guide was originally written for the 2. The linux kernel device driver docbook used to have a chapter with the media devices kabi. Kernel mode setting kms mode setting helper functions. The agenda has a clear focus on kernel level networking. Namespaces and cgroups, the basis of linux containers pdf linux containers and the future cloud pdf 85 pages slides. Supporting multifunction devices in the linux kernel. It is composed out of the system call interface of the linux kernel and the subroutines in the gnu c library glibc. The labs focus on device drivers topics and they resemble howto style documentation. This answer was written when the question was what is linuxs native api. One goal of this api is to be generic enough to support a wide range of networking hardware and use cases. The generated documentation is placed in documentationoutput. Underneath follows the protocol layer, consisting of.
Eventually, ori no longer had time to maintain the document. Dont hesitate to copy and paste commands from the pdf slides and labs. Thus a kernel provides its services to the applications through the means of api. The linux kernel is one of the components of an embedded linux system which was created by a finnish student named linus torvalds in 1991 as a hobby project. The linux programming interface published in october 2010, no starch press, isbn 9781593272203 is a detailed guide and reference for linux and unix system programming. A dynamic voltage and current regulator control interface for. The available bitmap operations and their rough meaning in the case that the bitmap is a single unsigned long are thus. The definitive guide to linux the linux programming. The linux kernel s no regression policy holds in practice only for opensource userspace of the drm subsystem. The linux kernel wikibooks, open books for an open world. And yes, the calls you mentioned are regarded as api calls. Code structure all les except the header le are in netmac80211.
Any request you give on shell or through gui like memory allocation, opening a file etc are finally fulfilled by kernel. Rather it describes the principles and mechanisms that linux uses. The linux driver implementers api guide linux kernel. Socketcan the official can api of the linux kernel. Peter jay salzman took over maintenance and updated it for the 2.
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