Linux学习-通信-Socket编写-优快云博客

本文链接：https://blog.youkuaiyun.com/Rocoer/article/details/90738940

本文深入讲解了TCP Socket编程的基本流程，包括Server端和Client端的实现。从创建socket到bind、listen、accept，再到send和recv，详细展示了如何在两端进行数据的发送与接收，并附带完整的代码示例。

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Server端代码

#include <stdio.h>
#include <sys/types.h>          /* See NOTES */
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
//#include <linux/in.h>
#include <stdlib.h>
#include <string.h>
int main(int argc,char **argv)
{
	char readbuf[128];
	char mes[128]={0};
	int n_read;
	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
	int s_fd;
	int c_fd;
	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);
	//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("accpet");
		}
		printf("get accpet%s\n",inet_ntoa(c_addr.sin_addr));	
		if(fork()==0)
		{
			if(fork()==0)
			{
				while(1)
				{
					memset(mes,0,sizeof(mes));
					printf("input\n");
					gets(mes);
					write(c_fd,mes,strlen(mes));
				}

			}
			//5.read
			while(1)
			{
				memset(readbuf,0,sizeof(readbuf));
				n_read=read(c_fd,readbuf,128);
				if(n_read==-1)
				{
					perror("read");
				}else
				{
					printf("get message:%d,%s\n",n_read,readbuf);
				}
			}
			break;
		}
	}
	return 0;
}

Client端编写

#include <stdio.h>
#include <sys/types.h>          /* See NOTES */
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
//#include <linux/in.h>
#include <stdlib.h>
#include <string.h>
int main(int argc,char **argv)
{
	char readbuf[128];
	char buf[128]={0};
	int n_read;
	struct sockaddr_in c_addr;
	memset(&c_addr,0,sizeof( struct sockaddr_in));

	//1.socket
	int c_fd;
	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

	int c_connect=connect(c_fd,(struct sockaddr *)&c_addr,sizeof(struct sockaddr));
	if(c_connect==-1)
	{
		perror("connect");
		exit(-1);
	}
	//3.send
	while(1)
	{
		if(fork()==0)
		{
			while(1)
			{	
				memset(buf,0,sizeof(buf));
				printf("input:\n");
				gets(buf);
				write(c_fd,buf,strlen(buf));
			}
			//5.read	
		}
		
		memset(readbuf,0,sizeof(readbuf));
		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;
}

注释，笔记晚点补上