printf usage

Now that we've entered the actual combat phase, we've learned the complete process of developing and testing a Linux driver using an example of counting the number of words. The first Linux driver is a count of the number of words.Instead of

/*semopen_pth.c*/#include #include #include #include #include void print ();void * Thread_function (void *arg);sem_t * SEM;int main (int argc,char * argv[]) {int n=0,i=0;pthread_t tid[5];if (argc! = 2) {printf ("usage:%s name.\n", argv[0]);exit (0);

Recently looked at this, did a AIO case to try, unfortunately, the compiler has no problem, the runtime needs permissions, open the way of access to the Internet, this permission is root can be, the company is not possible to give me this permission.

From the first contact with the HTTP protocol, I do not know what is going on, forming a false view that the HTTP protocol is a pure ASCII character protocol, that is, in the HTTP stream is not see the binary stream of the 0x00 value. In fact, the

Linux kernel has a very powerful function is to dynamically load the module, the module in this case is actually a kernel-supported applet. Before we actually get into the Linux kernel world, we can go through an addiction and load a kernel module

#include #include #include #include #pragma comment (lib, "Wsock32")#define Wavers Makeword (2,0)#define Def_delay 5#define Def_file "Cc.txt"#define DEF_THREAD 300#define DEF_MAXSEND 10000#define DEF_REF

The mkdir function is used to create a directory. The format is as follows:#include #include #include int mkdir (const char *pathname,mode_t mode); Where the parameter pathname is the directory name of the newly created directory, mode specifies

memcached Process Initiation and monitoring1.memcached_inc.shSets the path, port, and other messages. #!/bin/sh #config include host=$ (hostname) site= "MySite" port=11211 memcached_pid_file= "/ Tmp/memcached.pid "

gcc parameter explanation GCC and g++ are GNU's C &c++ compilers respectively. A total of 4 steps are required for gcc/g++ to perform compilation work: 1, preprocessing, generate. i file [preprocessor CPP] 2, the preprocessed file will not be

Copy Code code as follows: #!/bin/bash #name: upper_to_lower.sh #the function is Trun uper to lower #like ABCD to ABCD Haveuppernumber (){#test if the string have upper numberStr= "$ (echo $ | tr ' [: Upper:] ' [: Lower:] ')"If ["$str"!=

#include #include int main (int argc,int *argv[]) { Char ch; FILE *FP; Long count=0; if (argc!=2) { printf ("usage:%s filename\n", argv[0]); } if ((Fp=fopen (argv[1]), "R") ==null) { printf ("Can ' t open%s", argv[1]); Exit (1); } while ((CH=GETC (

For QEMU's startup parameters, QEMU uses some basic framework functions to complete the relevant parsing, which makes it easier for subsequent developers to add functionality. This part of the code is still a bit complicated, so let me

Version: MySQL-5.7.201. Replace the Yum sourceWget-o/etc/yum.repos.d/eprl.repo Http://mirrors.aliyun.com/repo/epel-6.repo2, installation CMakeTar XF cmake-3.0.0.tar.gzCD cmake-3.0.0./bootstrapMakeMake install2. Install boostTAR-ZXVF boost_1_59_0.tar.

Steps:1. Install Mariadb-server PackageYum Mariadb-server2, build a master folder three sub-folders, three sub-folders for each of the three strength note: Try to put this multi-instance in the logical volume is betterA, Mkdir/mysqldb/{3306,3307,3308

Centos7 on the implementation of multi-instance installation, is a service on 3306, 3307, more than 3,308 ports running and each database, equivalent to three different programs;1 Install Package yum -y install mariadb-server2 The database is

#include #include #include #include #include #include #include #include #include #include #include #include #include #include #define PACKET_SIZE 4096#define MAX_WAIT_TIME 5#define Max_no_packets 3 Char Sendpacket[packet_size];Char

Pit 1: mysql-5.5.32.tar.gz source package not foundIt took a lot of effort to find:MySQL Source package:https://downloads.mysql.com/archives/community/Download pathHttps://downloads.mysql.com/archives/get/file/mysql-5.5.32.tar.gzHow did I find the

MySQL Multi-instance installationNote: Pre-download Save mysql-5.5.57 package with CMake compile MySQL toolLl/home/rich/toolsMysql-5.5.57.tar.gz cmake-2.8.8.tar.gz1. Install dependent environment and CMake compilation softwareYum install-y

Centos6.6 Installing and configuring a single-machine multi-instance MySQL databaseThis article describes the environment for installing a single-machine multi-instance MySQL database as follows:System platform Environment: Centos6.6Mysql Package:

First, install MySQL1, production environment How to choose MySQL version1. Select the stable GA version of the Community edition2. You can choose 5.1 or 5.5. Internet company mainstream 5.5, followed by 5.1 and 5.63. Select the GA version for more