网络学习第四天-点对点的网络通信加强

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技术

1.socket的基本技术

2.进程的基本技术

3.信号的基本应用

话不多说，直接上我的思维图。

架构图

代码

1.服务器，所用技术，socket，进程，信号

#include<unistd.h>#include<sys/stat.h>#include<sys/wait.h>#include<sys/types.h>#include<stdlib.h>#include<stdio.h>#include<fcntl.h>#include<errno.h>#include<string.h>#include<signal.h>#include<arpa/inet.h>#include<sys/socket.h>#include<netinet/in.h>void handle(int num){    printf("rev num%d",num);    exit(0);}int main(){    int sockfd = 0;    signal(SIGUSR1,handle);//注册新号发射    sockfd = socket(PF_INET,SOCK_STREAM,0);    if(sockfd == -1)    {        perror("socket fun is error\n");        exit(0);    }    struct sockaddr_in srvaddr;    srvaddr.sin_family = AF_INET;    srvaddr.sin_port = htons(8001);    srvaddr.sin_addr.s_addr = inet_addr("127.0.0.1");       int optval = 1;    if(setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,&optval,sizeof(optval)))    {        perror("setsockopt is error\n");        exit(0);    }        if(bind(sockfd,(struct sockaddr*)&srvaddr,sizeof(srvaddr))<0)    {        perror("bind func error\n");        exit(0);    }    //监听    if(listen(sockfd,SOMAXCONN)<0)    {        perror("listen fun is error\n");        exit(0);    }    //客户端结构体    struct sockaddr_in perraddr;    socklen_t peerlen = sizeof(perraddr);    unsigned int conn = 0;    conn = accept(sockfd,(struct sockaddr*)&perraddr,(socklen_t*)&peerlen);    if(conn == -1)    {        perror("conn fun error\n");        exit(0);    }    //打印客户端链接    printf("1111=%s\n 2222=%d\n",inet_ntoa(perraddr.sin_addr),ntohs(perraddr.sin_port));    //启动子进程    int pid = fork();    //父进程接受数据    if(pid >0)    {        char revbuf[1024] = {0};//接受数据数组        while(1)        {            int ret = read(conn,revbuf,sizeof(revbuf));            if(ret == 0)            {                printf("对方已经挂掉\n");                break;            }            else if(ret<0)            {                perror("读取数据失败\n");                exit(0);            }            fputs(revbuf,stdout);            memset(revbuf,0,sizeof(revbuf));//清楚接受数据的内存重要        }        close(conn);        kill(pid,SIGUSR1);//杀掉子进程        sleep(1);    }    else    {        char sendbuf[1024] = {0};        while(fgets(sendbuf,sizeof(sendbuf),stdin)!=NULL)        {            write(conn,sendbuf,strlen(sendbuf));            memset(sendbuf,0,sizeof(sendbuf));        }    }    close(conn);    return 0;}

2.客户端，进程和socket进行编程

#include<unistd.h>#include<sys/stat.h>#include<sys/wait.h>#include<sys/types.h>#include<fcntl.h>#include<stdlib.h>#include<stdio.h>#include<errno.h>#include<string.h>#include<signal.h>#include<arpa/inet.h>#include<sys/socket.h>#include<netinet/in.h>#include<arpa/inet.h>int main(){    int sockfd = 0;    sockfd = socket(PF_INET,SOCK_STREAM,0);    if(sockfd == -1)    {        perror("socket fun is error\n");        exit(0);    }    struct sockaddr_in srvaddr;    srvaddr.sin_family = AF_INET;    srvaddr.sin_port = htons(8001);    srvaddr.sin_addr.s_addr = inet_addr("127.0.0.1");    if(connect(sockfd,(struct sockaddr*)(&srvaddr),sizeof(srvaddr))<0)    {        perror("connect is error\n");        exit(0);    }        int pid = fork();    if(pid>0)    {        //父进程操作        char sendbuf[1024] = {0};        while(fgets(sendbuf,sizeof(sendbuf),stdin)!=NULL)        {            write(sockfd,sendbuf,strlen(sendbuf));            memset(sendbuf,0,sizeof(sendbuf));        }    }    else    {        char revbuf[1024]={0};        while(1)        {            read(sockfd,revbuf,sizeof(revbuf));            fputs(revbuf,stdout);            memset(revbuf,0,sizeof(revbuf));        }    }        close(sockfd);    return 0;}

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