Linux

In UNIX, the file system is installed on a specific installation point, which is called a namespace in the global hierarchy, all installed file systems appear in the system as the branches of the root file system tree. An object can be viewed as

Configure openv in QT of fedora14 (Linux: 1, gedit/usr/share/qt4/mkspecs/default/qmake. confThe following two sentences are added to the file:Qmake_incdir =/usr/include/opencvQmake_libs =-lcvaux-LCV-lcxcore-lhighgui-lml 2.. ProAdd in file:

The camera model is a general USB camera. The running environment is on Linux, and the opencv version is 2.1. If it is a windows QT development environment, either change the configuration or follow the source code. Running on Linux is not a problem.

Interrupt Processing functions have their own limitations: 1. interruption can interrupt any importantCode(Interrupt shieldingInterrupt handler andHigh interrupt priority). The faster the interrupt processing function, the better. 2. the

Timer timer is widely used. In Linux, there are several methods: 1. Use sleep () and usleep () Sleep precision is 1 second, usleep precision is 1 subtle, specificCodeIt will not be written. The disadvantages of using this method are obvious. in

This article mainly reference: http://forum.ubuntu.org.cn/viewtopic.php? F = 122 & t = 196562 & START = 0, but the operation is not in the same order as the text description. record it.Decompress the package and compile the package. An error is

The physical page is the basic unit of kernel management. Three main purposes: 1. Page Cache Usage (mapping domain pointing to address_space object associated with this page); 2. Private Data (directed by private); 3, process page table ing. It is

What is interruption: Interruption is a way for some hardware to communicate asynchronously with the CPU. Exceptions are similar (the fundamental difference between interruption and exception remains to be studied and will be explained in the new

For example, there is a folder named 999 with the path:/home/Yan/999. I want to compress all the files in the folder named 999. Command: CD/home/Yan Tar-zcvf 999back.tar.gz 999 or tar-zcvf 999back.tar.gz./999 The 999back.tar.gz name is from your own,

1. the Linux system has just been installed and cannot switch to the root permission. This is because the password is not created. Enter the command: sudo passwd. Follow the prompts to set the Unix Password. This password is the password when you

This document describes how to develop a Linux Device Driver. 8.1 blocking and non-blocking I/O Blocking operationIf a device cannot obtain resources, it suspends the process until it meets the operational conditions. The suspended process enters

Finally speaking of the last registration, today is also the end of the year, but I am still fighting! After that, I have to relax. I have been studying the kernel for nearly half a month and have gained a lot. However, there are still many things

Character settings are the simplest devices in Linux. In Linux, character settings are described by a data structure char device struct called the character device structure. For ease of management, the system maintains an array chrdevslj. Each

Multi-Process Synchronization in Linux: For multi-process synchronization in Linux, the operation of a single semaphore is no longer possible. For multi-process communication, the signal set method can be used, A signal set contains multiple

Http://hi.baidu.com/%BB%F0%D0%C7%C6%B0%B3%E6911/blog/item/3c01cb8c3c5bccab0f244491.html Driver:# Include is to find the source file under the linux-2.6.29/include/Linux.# Include is to find the source file under the

When the Linux system is started, we can see that many service programs are started one by one (that is, the lines with blue [OK ), these programs run in the background play an important role in using computers. The programs run in this way have the

Mark Both uboot and Linux kernel define and use machine_arch_type. Suppose there is an application scenario where a BSP needs to support different boards, maybe different reference designs for the same chip. In this case, most BSP code can be

Socket programming windows to Linux code porting Problems 1. Some common function porting http://www.vckbase.com/document/viewdoc? Id = 1586 2. Network ------ reprint & modify (to be sorted out) socket-related programs need to be noted when porting

I. Access Functions Function Description:Check whether the calling process can perform certain operations on the specified file.Usage:# Include # Include Int access (const char * pathname, int mode );Parameters:Pathname: name of the file to be

Tar [-cxtzjvfppn] file and directory ....Parameters:-C: Create a parameter command for the compressed file );-X: Unlock the parameter command of a compressed file!-T: view the files in the tarfile!Note that C/X/T can only exist under the parameter!