Linux

First, write Add. c In the VI editor. # Include "test. H "# include int add (int A, int B) {return a + B;} int main () {printf ("2 + 3 = % d \ n", add (2, 3); printf ("5-3 = % d \ n", sub (5, 3); return 1 ;} Then write the sub. c file: #

1. directly use the Export command:# Export Path = $ path: custom pathCheck whether a port has been set. Run the Export command to view the Port:[Root @ localhost bin] # ExportPath = $ path: custom path2. Modify the profile file:#

 Copyright NoticeRespect Original Works. Reprinted, please maintainArticleIntegrity, and the original author "tingsking18" and the main site address are indicated in the form of a hyperlink, so that other friends can ask and correct.  Download the

People are used to the following methods to express time: year, month, day, hour, minute, second, millisecond, week, etc. But in the kernel, for the sake of Software Logic andCodeIt uses different time Representation Methods and defines the

What is the difference between buffer and cache? Let's start with the free command. Free Compared with top, the free command provides a more concise view of the system memory usage: $ Free total used free shared buffers cached Mem: 255268 23

I am afraid of losing it.   How SSH implements password-less Logon: 1. The asymmetric key is used, and the client SSH is used.ProgramGenerate a pair of keys (Public key file: ~ /. Ssh/id_rsa.pub ; Private Key file: ~ /. Ssh/id_rsa

due to work needs in the past few days, I have pondered the multi-thread related information in Linux. In Linux, the most common multi-thread support library is the pthread library, which is part of the glibc library. However, there are very few

Thread Data Processing Compared with a process, one of the biggest advantages of a thread is data sharing. Each process shares the data segment that follows the parent process to conveniently obtain and modify data. But this also brings many

Linux Crash Dump File generation and use Version 1.1: 2008-10-28   UnlikeWindowsProgramYou need to manually call related functions,LinuxProgramCrash Dump(CalledCore Dump) The file will crash in the program (suchSIGSEGV)

The latest ubuntu10.04 image loaded under VMware 7 will show unrecognized keyboard input. You cannot enter a password on the logon screen. Solution: (1) Account Opening screen keyboard function Click the villain pattern in the lower right

1. Disable all input forward Output and only open it to some ports.The following is a command implementation: Iptables-P input dropIptables-P forward dropIptables-P output drop Run the command iptables-l-N to check whether the settings are

I. Design UDP Server People usually use telephone connections to describe the TCP protocol, while UDP is often used as a metaphor by mail. Different from TCP-connected information transmission modes, UDP is considered to be a simple extension of

1. Linux entry and exitEnterLinux:You must enter your account. You can create the following two accounts during system installation:1. Root-Super User Account (System Administrator), which can be used to do anything in the system.2. Common

EchoCommand The echo command is used to display a piece of text on the monitor, which generally serves as a prompt. The general format of this command is Echo [-N] string. Option n indicates that the output text does not wrap. Strings can be

Experiment 2 Linux programming Basics I. Tutorial PurposeFamiliar with the C language programming method in Linux. By using the process control system calling function in programming, You can intuitively understand the concurrent execution of

3. Condition Variables The previous section describes how to use mutex to share and communicate data between threads. One obvious drawback of mutex is that it has only two States: Lock and non-lock. Conditional variables make up for the lack of

 Copyright Notice Respect Original Works. Reprinted, please maintain the integrity of the article, and in the form of a hyperlink to indicate the original author "tingsking18" and the main site address, so that other friends can ask and correct.    

1.4 Input_dev . The last step to input the device driver's initialization function is to callInput_register_deviceRegister a device. This function is shown in figureProgram list1. 9. Program list 1.9Input_register_device /* Driver/input.

1.5 Transfer of event reports Input subsystem device to report various events passedInput_report_xxxFamily functions, suchProgram list1. 5Report button events. Buttons, relative coordinates, absolute coordinates, and synchronization event

As mentioned in the previous section, ASOC is divided into three parts: machine, platform, and CODEC. The machine driver is responsible for the coupling between platform and CODEC and the code specific to the part and device or board, rereference