Chapter 5 Interprocess Communication Mechanisms
Chapter 5 Interprocess Communication Mechanisms Processes communicate with each other and with the kernel to coordinate their activities. Linux supports a number of Inter-Process Communication (IPC) mechanisms. Signals and pipes are two of them but Linux also supports the System V IPC mechanisms named after the Unix TM release in which they first appeared. 5.1 Signals Signals are one of the oldes
Linux Loadable Kernel Module HOWTO
Add some 2.6 info and disclaimers. Update references to Linux Device Drivers book, Linux Kernel Module Programming Guide.
Setting up the PPP connection files
You now need to be logged in as root to create the directories and edit the files needed to set up PPP, even if you want PPP to be accessible to all users. PPP uses a number of files to connect and set up a PPP connection. These differ in name and location between PPP 2.1.2 and 2.2+. For PPP 2.1.2 the files are:- /usr/sbin/pppd # the PPP binary /usr/sbin/ppp-on # the dialer/connection script /usr/
Introduction
Script: A writing; a written document. [Obs.] --Webster's Dictionary, 1913 ed. The shell is a command interpreter. More than just the insulating layer between the operating system kernel and the user, it's also a fairly powerful programming language. A shell program, called a script, is an easy-to-use tool for building applications by "gluing together" system calls, tools, utilities, and compiled
PROMPT_COMMAND
4.1. PROMPT_COMMANDBash provides an environment variable called PROMPT_COMMAND. The contents of this variable are executed as a regular Bash command just before Bash displays a prompt. [21:55:01][giles@nikola:~] PS1="[\u@\h:\w]\$ " [giles@nikola:~] PROMPT_COMMAND="date +%H%M" 2155 [giles@nikola:~] d bin mail 2156 [giles@nikola:~] What happened above was that I changed PS1 to no longer include the
Debugging
Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it. --Brian Kernighan The Bash shell contains no built-in debugger, and only bare-bones debugging-specific commands and constructs. Syntax errors or outright typos in the script generate cryptic error messages that are often
Taking a Backup Using Snapshots
13.4. Taking a Backup Using Snapshots Following on from the previous example we now want to use the extra space in the "ops" volume group to make a database backup every evening. To ensure that the data that goes onto the tape is consistent we use an LVM snapshot logical volume. A snapshot volume is a special type of volume that presents all the data that was in the volume at the time the snapshot
Extending a logical volume
11.9. Extending a logical volume To extend a logical volume you simply tell the lvextend command how much you want to increase the size. You can specify how much to grow the volume, or how large you want it to grow to: # lvextend -L12G /dev/myvg/homevol lvextend -- extending logical volume "/dev/myvg/homevol" to 12 GB lvextend -- doing automatic backup of volume group "myvg" lvextend -- logical vo
The Linux Kernel Module Programming Guide
The Linux Kernel Module Programming GuidePeter Jay Salzman Ori Pomerantz Copyright © 2001 Peter Jay Salzman The Linux Kernel Module Programming Guide is a free book; you may reproduce and/or modify it under the terms of the Open Software License, version 1.1. You can obtain a copy of this license at http://opensource.org/licenses/osl.php. This book is distributed in the hope it will be useful, but
Virtual Services Howto: Virtuald
Next Previous Contents 3. Virtuald 3.1 Introduction Every network connection is made up of two IP address/port pairs. The API (Applications Program Interface) for network programming is called the Sockets API. The socket acts like an open file and by reading/writing to it you can send data over a network connection. There is a function call getsockname that will return the IP address of the local
Reducing a logical volume
11.10. Reducing a logical volume Logical volumes can be reduced in size as well as increased. However, it is very important to remember to reduce the size of the file system or whatever is residing in the volume before shrinking the volume itself, otherwise you risk losing data. ext2 If you are using LVM 1 with ext2 as the file system then you can use the e2fsadm command mentioned earlier to take
BASH Programming - Introduction HOW-TO: Loops for, while and until
Next Previous Contents 7. Loops for, while and until In this section you'll find for, while and until loops. The for loop is a little bit different from other programming languages. Basically, it let's you iterate over a series of 'words' within a string. The while executes a piece of code if the control expression is true, and only stops when it is false (or a explicit break is found within the e
Debian Binary Package Building HOWTO
1. Introduction The intended use of such a newly created archive is to install it only on your own box, not to get them into the official Debian distribution. To follow the 'official' process, please study the Debian New Maintainers' Guide. Normal Debian packages get a proper source package, including a debian/rules file which automates the steps involved in creating the binary package. Here we ju
The Linux Kernel
This book is for Linux enthusiasts who want to know how the Linux kernel works. It is not an internals manual. Rather it describes the principles and mechanisms that Linux uses; how and why the Linux kernel works the way that it does. Linux is a moving target; this book is based upon the current, stable, 2.0.33 sources as those are what most individuals and companies are now using. This book is fr
Linux 2.4.x Initialization for IA-32 HOWTO
Randy Dunlap, rddunlap@ieee.orgv1.0, 2001-05-17 This document contains a description of the Linux 2.4 kernel initialization sequence on IA-32 processors. 1. Introduction 1.1 Overview 1.2 This document 1.3 Contributions 1.4 Trademarks 1.5 License 2. Linux init ("ASCII art") 3. Linux early setup 3.1 IA-32 Kernel Setup 3.2 Video Setup 4. Linux architecture-specific initialization 4.1 startup_32: 4.2
The Linux keyboard and console HOWTO: Changing the video mode
Next Previous Contents 16. Changing the video mode As far as I know there are 6 ways to change resolution: 1. At compile time: change the line SVGA_MODE= -DSVGA_MODE=NORMAL_VGA in /usr/src/linux/Makefile. 1A. After compilation: use rdev -v - a terrible hack, but it exists. 2. At boot time: put vga=ask in the lilo config file, and lilo will ask you what video mode you want. Once you know, put vga=m
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The Linux Documentation Project
The Linux Documentation Project is now on tldp.org
Linux Filesystem Hierarchy
6 Linux Interprocess Communications