mmap example

In this example, the screen writing function is implemented, that is, the screen is cleared (black). The procedure is roughly as follows: open a framebuffer device; the physical memory space of the video card is mapped to the user space through the MMAP call. The memory is written directly through the ing relationship. Header file//////////////////////////////////////////// // Fbtools. h ///////////////////

Article title: user mode and kernel shared memory: the simplest example. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. # Include# Include# Include# IncludeMODULE_LICENSE ("GPL ");MODULE_AUTHOR ("Wheelz ");MODULE_DESCRIPTION ("mmap demo "); Static unsigned long p = 0;St

The main points of a single case pattern are three: One is that a class can have only one instance;The second is that it must create this instance by itself;Third, it must provide this example to the whole system. Copy Code code as follows: /* Single example mode, the main points are as follows: * * 1. $_instance must be declared as a static private variable* 2. Constructors and cloning functi

Js and json interaction theory and example, and jsjson theory example The theory and skills are explained in detail, which is of great significance in practical development. JSON syntax can represent the following three types of values. Quiet simple value: Use the same syntax as JavaScript to represent strings, values, Boolean values, and null in JSON. JSON does not support special undefined values in Java

Yii2 database read/write splitting configuration example, yii2 example To start using a database, you must first configure the database connection component and add the db component to the application configuration. (the "Basic" Web application is config/web. PHP), DSN (Data Source Name) is the Name of the Data Source, used to specify the database information. as follows: Return [//... 'components' => [//..

CodeIgniter Configuration Session Usage example analysis, Session usage example This example describes the session usage of CodeIgniter configuration. Share to everyone for your reference, as follows: Just use CodeIgniter when the session was also confused, and then no longer use CI since the session, presumably still need to tidy up the session. To understand t

This example describes the Zend Framework action Assistant redirector usage. Share to everyone for your reference, specific as follows: Redirector provides another way to implement the Help program to redirect to internal or external pages; The steering Gear (redirector) assistant lets you redirect to a new URL using a Redirector Object helper program. Compared with the _redirect () method, it has many advantages. For

Example analysis of credit rating model (taking consumer finance as an example)original 2016-10-13 Canlanya General Assembly data Click "Asia-General data" to follow us!the fifth chapter analysis and treatment of self-variableThere are two types of model variables, namely, continuous type variables. A continuous variable refers to the actual value of the variable as observed data, and is not processed by a

Php Data filtering function and method example, php filter function example1. Basic principles of php Data submission and filtering1) when submitting variables to the database, we must use addslashes () for filtering. For example, we can solve an addslashes () problem. In fact, when variable values are involved, the intval () function is also a good choice for string filtering.2) Enable magic_quotes_gpc and

PHP implementation of the simplest MVC Framework Example tutorial, MVC framework Example Tutorial In this paper, the process of implementing the MVC framework in PHP is described in the form of an example, which is relatively easy to understand. We are now sharing it for your reference. The specific analysis is as follows: First of all, before learning a framewo

C language example 03-above, C language example 03- Sorry, I have to do some work for my family these two days. In addition, the internal capacity and operation volume are also greatly increased. Therefore, writing is slow. But starting from today. Many of the things I wrote have never been learned before. So the speed will slow down, and the write will be detailed. The third chapter is data structure, whic

ThinkPHP form automatic verification example, thinkphp example. ThinkPHP form automatic verification example, thinkphp example uses TP3.2 framework publicfunctionadd_post () {verification rule $ rulearray (array (name, require, please enter name, 1 ), the ThinkPHP form must be used for automatic verification. Use the

PHP cURL Library introduction and use example, phpcurl library example. PHP cURL Library introduction and use examples. phpcurl Library examples use PHP cURL library to easily and effectively capture webpages. You only need to run a script, and analyze the cURL Library introduction and use examples of PHP on the web page you crawled, and the phpcurl library example