Linux系统编程——网络编程（套接字）代码

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代码内容：

Linux系统编程——套接字

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运行环境：

Linux

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编程语言：

C语言

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主要语法：

函数，指针，结构体

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备注：

个人日常学习代码存档

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代码

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socket_client.c：

#include 
#include 
#include 
//#include 
#include 
#include 
#include 
#include 
#include 

int main(int argc,char **argv)
{
     
	int c_fd;	
	int n_read;
	char readBuf[128];
	char *msg = "msg from client";
	struct sockaddr_in c_addr;
	
	memset(&c_addr,0,sizeof(struct sockaddr_in));

	//1.socket
	c_fd = socket(AF_INET,SOCK_STREAM,0);
	if(c_fd == -1)
	{
     
		perror("socket");
		exit(-1);
	}
	
	c_addr.sin_family = AF_INET;
	c_addr.sin_port = htons(atoi(argv[2]));
	inet_aton(argv[1],&c_addr.sin_addr);
	//2.connect
	if(connect(c_fd,(struct sockaddr *)&c_addr,sizeof(struct sockaddr)) == -1)
	{
     
		perror("connect");
		exit(-1);
	}
	

	//3.send
	write(c_fd,msg,strlen(msg));
	//4.read
	n_read = read(c_fd,readBuf,128);
	if(n_read == -1)
	{
     
		perror("read"); 
	}
	else
	{
     
		printf("get message:%d,%s\n",n_read,readBuf);
	}

	return 0;
}

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socket_client2.c：

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
//#include 

int main(int argc,char **argv)
{
     
	int c_fd;	
	int n_read;
	char readBuf[128];
//	char *msg = "msg from client";
	char msg[128] = {
     0};
	struct sockaddr_in c_addr;
	
	//初始化内存	
	memset(&c_addr,0,sizeof(struct sockaddr_in));

	//1.创建套接字 socket()
	c_fd = socket(AF_INET,SOCK_STREAM,0);
	if(c_fd == -1)  //判断是否错误
	{
     
		perror("socket");
		exit(-1);
	}
	
	c_addr.sin_family = AF_INET;
	c_addr.sin_port = htons(atoi(argv[2]));  //设置端口号
	inet_aton(argv[1],&c_addr.sin_addr);     //设置IP地址

	//2.客户端直接与服务器进行连接  connect()
	if(connect(c_fd,(struct sockaddr *)&c_addr,sizeof(struct sockaddr)) == -1)
	{
     
		perror("connect");  //判断是否错误
		exit(-1);
	}
	//printf("Connect to server successfully!");	

	//3.进行收发信息
	//此处的while好像没有必要
	while(1)
	{
     
		//创建子进程进行发信息
		if(fork() == 0)
		{
     
			while(1)
			{
     
				memset(msg,0,sizeof(msg));
				printf("Please input your message: ");
				gets(msg);
				write(c_fd,msg,strlen(msg));
			}
		}
		//接受消息
		while(1)
		{
     
			memset(readBuf,0,sizeof(readBuf));
			n_read = read(c_fd,readBuf,128);
			if(n_read == -1)  //判断是否错误
			{
     
				perror("read"); 
			}
			else
			{
     
				printf("\n");
				printf("Get message: %s\n",readBuf);
				printf("please input your message: ");
			}
		}
	}
	return 0;
}

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socket_client3.c：

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
//#include 

int main(int argc,char **argv)
{
     
	int c_fd;	
	int n_read;
	char readBuf[128];
//	char *msg = "msg from client";
	char msg[128] = {
     0};
	struct sockaddr_in c_addr;
	
	//初始化内存	
	memset(&c_addr,0,sizeof(struct sockaddr_in));

	//1.创建套接字 socket()
	c_fd = socket(AF_INET,SOCK_STREAM,0);
	if(c_fd == -1)  //判断是否错误
	{
     
		perror("socket");
		exit(-1);
	}
	
	c_addr.sin_family = AF_INET;
	c_addr.sin_port = htons(atoi(argv[2]));  //设置端口号
	inet_aton(argv[1],&c_addr.sin_addr);     //设置IP地址

	//2.客户端直接与服务器进行连接  connect()
	if(connect(c_fd,(struct sockaddr *)&c_addr,sizeof(struct sockaddr)) == -1)
	{
     
		perror("connect");  //判断是否错误
		exit(-1);
	}
	//printf("Connect to server successfully!");	

	//3.进行收发信息
	//此处的while好像没有必要
	while(1)
	{
     
		//创建子进程进行发信息
		if(fork() == 0)
		{
     
			while(1)
			{
     
				memset(msg,0,sizeof(msg));
				printf("Please input your message: ");
				gets(msg);
				write(c_fd,msg,strlen(msg));
			}
		}
		//接受消息
		while(1)
		{
     
			memset(readBuf,0,sizeof(readBuf));
			n_read = read(c_fd,readBuf,128);
			if(n_read == -1)  //判断是否错误
			{
     
				perror("read"); 
			}
			else
			{
     
				printf("\n");
				printf("Get message: %s\n",readBuf);
				printf("please input your message: ");
			}
		}
	}
	return 0;
}

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socket_server.c：

#include 
#include 
#include 
//#include 
#include 
#include 
#include 
#include 
#include 

int main(int argc,char **argv)
{
     
	int s_fd;
	int c_fd;	
	int n_read;
	char readBuf[128];
	char *msg = "I get your connect";
	struct sockaddr_in s_addr;
	struct sockaddr_in c_addr;
	
	memset(&s_addr,0,sizeof(struct sockaddr_in));
	memset(&c_addr,0,sizeof(struct sockaddr_in));

	//1.socket
	s_fd = socket(AF_INET,SOCK_STREAM,0);
	if(s_fd == -1)
	{
     
		perror("socket");
		exit(-1);
	}
	
	s_addr.sin_family = AF_INET;
	s_addr.sin_port = htons(atoi(argv[2]));
	inet_aton("argv[1]",&s_addr.sin_addr);
	//2.bind
	bind(s_fd,(struct sockaddr *)&s_addr,sizeof(struct sockaddr_in));
	
	//3.listen
	listen(s_fd,10);
	printf("test1\n");	
	//4.accept
	int clen = sizeof(struct sockaddr_in);

	while(1)
	{
     
		c_fd = accept(s_fd,(struct sockaddr *)&c_addr,&clen);
		if(c_fd == -1)
		{
     
			perror("accept");
		}

		printf("get connect:%s\n",inet_ntoa(c_addr.sin_addr));
		
		if(fork() == 0)
		{
     
			//5.read
			n_read = read(c_fd,readBuf,128);
			if(n_read == -1)
			{
     
				perror("read"); 
			}
			else
			{
     
				printf("get message:%d,%s\n",n_read,readBuf);
			}
		
			//6.write
		
			write(c_fd,msg,strlen(msg));
			break;
		}
	}
	return 0;
}

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socket_server2.c：

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

int main(int argc,char **argv)
{
     
	int s_fd;
	int c_fd;	
	int n_read;
	char readBuf[128];
	char msg[128] = {
     0};
	struct sockaddr_in s_addr;
	struct sockaddr_in c_addr;

	//判断输入的参数是否符合要求
	if(argc != 3)
	{
     
		printf("param is not input\n");
		exit(-1);
	}
	//初始化内存，将某一块内存中的内容全部设置为指定的值
	memset(&s_addr,0,sizeof(struct sockaddr_in));
	memset(&c_addr,0,sizeof(struct sockaddr_in));

	//1.创建套接字 socket()
	s_fd = socket(AF_INET,SOCK_STREAM,0);
	if(s_fd == -1)		   //判断错误
	{
     
		perror("socket");  //输出错误信息
		exit(-1);  	   //退出
	}
	
	s_addr.sin_family = AF_INET;
	s_addr.sin_port = htons(atoi(argv[2])); //配置端口号
	inet_aton("argv[1]",&s_addr.sin_addr);  //配置IP地址

	//2.为套接字添加信息 bind()
	bind(s_fd,(struct sockaddr *)&s_addr,sizeof(struct sockaddr_in));
	
	//3.监听网络连接 listen()
	listen(s_fd,10);  //未连接之前会卡在这里
		
	//4.接受连接请求 accept()
	int clen = sizeof(struct sockaddr_in);
	
	//5.开始收发信息
	while(1)
	{
     
		c_fd = accept(s_fd,(struct sockaddr *)&c_addr,&clen);
		//判断错误
		if(c_fd == -1)
		{
     
			perror("accept"); 
		}
		//连接成功，输出对方IP
		printf("Get connect: %s\n",inet_ntoa(c_addr.sin_addr));
		//创建一个子进程去收发消息
		if(fork() == 0)
		{
     	
			//子进程再创建一个子进程负责发消息
			if(fork() == 0)
			{
     	
				while(1)
				{
     
					memset(msg,0,sizeof(msg));
					printf("Please input your message: ");
					gets(msg);
					write(c_fd,msg,strlen(msg));
				}
			}	
			//子进程负责收消息
			while(1)
			{
     	
				memset(readBuf,0,sizeof(readBuf));
				n_read = read(c_fd,readBuf,128);
				//判断错误
				if(n_read == -1)
				{
     
					perror("read"); 
				}
				else
				{
     
					printf("\n");
					printf("Get message: %s\n",readBuf);
					printf("please input your message: ");
				}
			}
			//break;
			//此处需要考虑父进程要不要退出还是卡住
			while(1);
		}
	}
	return 0;
}

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socket_server3.c：

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

int main(int argc,char **argv)
{
     
	int s_fd;
	int c_fd;	
	int n_read;
	int mark = 0;
	char readBuf[128];
	char msg[128] = {
     0};
	struct sockaddr_in s_addr;
	struct sockaddr_in c_addr;

	//判断输入的参数是否符合要求
	if(argc != 3)
	{
     
		printf("param is not input\n");
		exit(-1);
	}
	//初始化内存，将某一块内存中的内容全部设置为指定的值
	memset(&s_addr,0,sizeof(struct sockaddr_in));
	memset(&c_addr,0,sizeof(struct sockaddr_in));

	//1.创建套接字 socket()
	s_fd = socket(AF_INET,SOCK_STREAM,0);
	if(s_fd == -1)		   //判断错误
	{
     
		perror("socket");  //输出错误信息
		exit(-1);  	   //退出
	}
	
	s_addr.sin_family = AF_INET;
	s_addr.sin_port = htons(atoi(argv[2])); //配置端口号
	inet_aton("argv[1]",&s_addr.sin_addr);  //配置IP地址

	//2.为套接字添加信息 bind()
	bind(s_fd,(struct sockaddr *)&s_addr,sizeof(struct sockaddr_in));
	
	//3.监听网络连接 listen()
	listen(s_fd,10);  //未连接之前会卡在这里
		
	//4.接受连接请求 accept()
	int clen = sizeof(struct sockaddr_in);
	
	//5.开始收发信息
	while(1)
	{
     
		c_fd = accept(s_fd,(struct sockaddr *)&c_addr,&clen);
		//判断错误
		if(c_fd == -1)
		{
     
			perror("accept"); 
		}
		mark++;
		//连接成功，输出对方IP
		printf("Get connect: %s\n",inet_ntoa(c_addr.sin_addr));
		//创建一个子进程去收发消息
		if(fork() == 0)
		{
     	
			//子进程再创建一个子进程负责发消息
			if(fork() == 0)
			{
     	
				while(1)
				{
     
					sprintf(msg,"Welcome No.%d client",mark);//格式化输出函数，将“”写入字符串msg中
					write(c_fd,msg,strlen(msg));
					sleep(3);
				}
			}	
			//子进程负责收消息
			while(1)
			{
     	
				memset(readBuf,0,sizeof(readBuf));
				n_read = read(c_fd,readBuf,128);
				//判断错误
				if(n_read == -1)
				{
     
					perror("read"); 
				}
				else
				{
     
					printf("\n");
					printf("Get message: %s\n",readBuf);
					printf("please input your message: ");
				}
			}
			//break;
			//此处需要考虑父进程要不要退出还是卡住
			while(1);
		}
	}
	return 0;
}

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test_sl.c：

#include 
int main(int argc,char **argv)
{
     
	int time = atoi(argv[1]);
	for(int i=0;i<time;i++)
	{
     
		system("sl");
	}

	
}

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附：

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