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Linux Daemon Writing HOWTO


Saved by uncleflo on January 4th, 2019.

A daemon (or service) is a background process that is designed to run autonomously,with little or not user intervention. The Apache web server http daemon (httpd) is one such example of a daemon. It waits in the background listening on specific ports, and serves up pages or processes scripts, based on the type of request. Creating a daemon in Linux uses a specific set of rules in a given order. Knowing how they work will help you understand how daemons operate in userland Linux, but can operate with calls to the kernel also. In fact, a few daemons interface with kernel modules that work with hardware devices, such as external controller boards, printers,and PDAs. They are one of the fundamental building blocks in Linux that give it incredible flexibility and power. Throughout this HOWTO, a very simple daemon will be built in C. As we go along, more code will be added, showing the proper order of execution required to get a daemon up and running.

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Saved by uncleflo on October 17th, 2016.

Very fast cross-platform php script that describes the host server in extreme detail, giving information such as ram usage, disk space, raid arrays, hardware, network cards, kernel, os, samba/cups/truecrypt status, temps, disks, and much more. Latest code is here: https://github.com/jrgp/linfo

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HDG Explains - Swapfile.sys, Hiberfil.sys and Pagefile.sys in Windows 8 - Help Desk Geek


Saved by uncleflo on June 10th, 2015.

In previous versions of Windows, you probably remember the good ol paging file. It’s used to when physical memory becomes overcommitted and it hold objects that usually have not been accessed in a long time. That is pagefile.sys. Next, we had the hibernate option in Windows that let you save the kernel and all applications to your hard drive so that you could start your computer back up faster than doing a full reboot. That is hiberfile.sys.

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Linux Tech Talks: Overview of the LSM and SELinux internal structure and workings


Saved by uncleflo on March 26th, 2015.

Kernel services for which LSM has inserted hooks and structures to allow access control managed by 3rd party module. SELinux plays an important role during the early stages of system start-up. Because all processes must be labeled with their correct domain, init performs some essential operations early in the boot process to maintain synchronization between labeling and policy enforcement.

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ODROID | Hardkernel


Saved by uncleflo on February 8th, 2014.

This is the standard ODROID-U3. The ODROID Magazine will give you the full guide for it. http://magazine.odroid.com/. All ODROID-U2 software is fully compatible with ODROID-U3. The Powerful Linux Computer. 1.7GHz Quad-Core processor and 2GByte RAM. 10/100Mbps Ethernet with RJ-45 LAN Jack. 3 x High speed USB2.0 Host ports. Audio codec with headphone jack on board. XUbuntu 13.10 or Android 4.x Operating System. Size : 83 x 48 mm, Weight : 48g including heat sink. Package includes the main board and the heat sink . All technical information and questions on ODROID forum

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Cool Solutions: Creating Custom init Scripts


Saved by uncleflo on September 5th, 2013.

Novell/SUSE Linux uses a system of scripts to determine which services to run on system boot. These scripts exist in /etc/init.d/ (or the symbolic link /etc/rc.d/), and are referred to as 'init scripts.' They help dictate which services are active in each runlevel, and also allow the services to be manually controlled. For more information on runlevels, see this article. Each service that ships with Novell/SUSE Linux installs a script in /etc/init.d/. If a custom service is installed it may not have a init script. This article explains how to create these scripts.

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#578826 - udev rules must not rename kernel devices - Debian Bug report logs


Saved by uncleflo on August 31st, 2013.

ENV{DM_NAME}=="?*", NAME="mapper/$env{DM_NAME}", SYMLINK+="$kernel" This is not supported and must be fixed. Udev does not support swapping primary device names around, and devtmpfs will always create the device node with the kernel name anyway.

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openSUSE 12.3: Chapter 12. Dynamic Kernel Device Management with udev


Saved by uncleflo on August 31st, 2013.

The kernel can add or remove almost any device in a running system. Changes in the device state (whether a device is plugged in or removed) need to be propagated to userspace. Devices need to be configured as soon as they are plugged in and recognized. Users of a certain device need to be informed about any changes in this device's recognized state. udev provides the needed infrastructure to dynamically maintain the device node files and symbolic links in the /dev directory. udev rules provide a way to plug external tools into the kernel device event processing. This enables you to customize udev device handling by, for example, adding certain scripts to execute as part of kernel device handling, or request and import additional data to evaluate during device handling.

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initrd - Linux Command - Unix Command


Saved by uncleflo on August 31st, 2013.

The special file /dev/initrd is a read-only block device. Device /dev/initrd is a RAM disk that is initialized (e.g. loaded) by the boot loader before the kernel is started. The kernel then can use the the block device /dev/initrd's contents for a two phased system boot-up. In the first boot-up phase, the kernel starts up and mounts an initial root file-system from the contents of /dev/initrd (e.g. RAM disk initialized by the boot loader). In the second phase, additional drivers or other modules are loaded from the initial root device's contents. After loading the additional modules, a new root file system (i.e. the normal root file system) is mounted from a different device.

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The Linux BootPrompt-HowTo


Saved by uncleflo on August 31st, 2013.

This is the BootPrompt-Howto, which is a compilation of all the possible boot time arguments that can be passed to the Linux kernel at boot time. A discussion of how the kernel sorts boot time arguments, along with an overview of some of the popular software used to boot Linux kernels is also included.

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Saved by uncleflo on August 30th, 2013.

The LDP Wiki is the entry point for any work in progress. LDP is a loosely knit team of volunteers who provide documentation for many aspects of Linux. There are several forms of documentation: Guides, HOWTOs, man pages, and FAQs.

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10 boot time parameters you should know about the Linux kernel


Saved by uncleflo on August 30th, 2013.

The Linux kernel accepts boot time parameters as it starts to boot system. This is used to inform kernel about various hardware parameter. You need boot time parameters: Troubleshoot system, Hardware parameters that the kernel would not able to determine on its own, Force kernel to override the default hardware parameters in order to increase performance, Password and other recovery operations

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Saved by uncleflo on August 24th, 2013.

When we first designed targeted policy, we defined a domain that allowed users and administrators to login and have the same access privileges they would have had if SELinux was disabled. Similarly, we wanted to allow third party applications to be installed and run without requiring the administrator/user to write special policy rules for these applications. They would just work.

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Saved by uncleflo on August 24th, 2013.

/etc/hosts is a plain text file that associates IP addresses with host names and which is accessed by all commands that use the network in the absence of a name server. An IP address is a unique numeric identifier for a host (i.e., computer or other device) on the Internet or other TCP/IP (transmission control protocol/Internet protocol) network. A name server is a server (i.e., a specialized computer or software) that converts human-readable host names into numeric IP addresses.

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23.3. Configuring a DHCP Client


Saved by uncleflo on July 14th, 2013.

The first step for configuring a DHCP client is to make sure the kernel recognizes the network interface card. Most cards are recognized during the installation process and the system is configured to use the correct kernel module for the card. If a card is added after installation, Kudzu[6] should recognize it and prompt for the configuration of the corresponding kernel module for it. Be sure to check the Hardware Compatibility List available at http://hardware.redhat.com/hcl/. If the network card is not configured by the installation program or Kudzu and you know which kernel module to load for it, refer to Chapter 37, Kernel Modules for details on loading kernel modules.

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FFmpeg Static Builds


Saved by uncleflo on May 17th, 2013.

Below you will find static builds of FFmpeg for 64bit Linux. Static builds have all the external libs listed below built into the binary. There's nothing to install or library conflicts to deal with. These binaries will work with any system that runs 64bit (x86_64) Linux with kernel 2.6.26 or later. The build now includes `ffmpeg` built with 8bit libx264 support and `ffmpeg-10bit` built with 10bit libx264 support! If you appreciate this up-to-date build of FFmpeg and my time that goes into to maintaining it, please consider making a donation. Thank you.

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Result Linux patch/support for: RevoDrive3, RevoDrive3 X2, zDrive R4


Saved by uncleflo on January 26th, 2012.

After a friend bought a RevoDrive3 120GB without doing much research, I got annoyed that there wasn't any Linux support, so I looked at the Windows driver and wrote in some Linux support. Written & tested remotely on his machine, in 6 hours on a Saturday afternoon. It _should_ work for RevoDrive3, RevoDrive X2 as well as zDrive R4, as they all seem to use the same Marvell 88SE9485 part and Sandforce 2281 or 2582 together. My patch has been submitted to the linux-kernel, linux-scsi, linux-ide mailing lists for review and inclusion. http://www.spinics.net/lists/linux-scsi/msg54932.html Anybody that wants to use it, you need to apply the linked/attached patch on top of a kernel at least v3.1-rc1 or newer.

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Interactive map of Linux kernel


Saved by uncleflo on January 17th, 2011.

A map of the Linux kernel with all mods and paths of calling code and other interfaces. It gives a very nice oversight of how the system is built up. A very nice wall poster, or a poster to hang up in the office. Someone could learn the basic steps of how the kernel works, if he/she works with electronics at a very low level.

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Bugs/F8Common - Fedora Project Wiki


Saved by uncleflo on May 22nd, 2008.

BUGS/F8Common - Fedora Project Wiki

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