多路IOepoll模型

最新推荐文章于 2024-11-27 14:43:56 发布

After0514

最新推荐文章于 2024-11-27 14:43:56 发布

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分类专栏： LINUX C/S

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本文介绍了一个使用Epoll实现的多客户端聊天服务器的设计与实现细节。该服务器能够同时处理多个客户端连接请求，并通过Epoll机制高效地管理这些连接。客户端可以向服务器发送消息，服务器将接收到的消息转换为大写并返回给客户端。

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server.c

#include<errno.h>
#include<semaphore.h>
#include<string.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<errno.h>
#include<stdlib.h>
#include<unistd.h>
#include<stdio.h>
#include<sys/mman.h>
#include<sys/types.h>
#include<signal.h>
#include<pthread.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<sys/socket.h>
#include<sys/select.h>
#include<sys/poll.h>
#include<sys/epoll.h>
#include "wrap.h"
#define SERVER_PORT 8000
#define MAXLINE 4096
#define OPEN_MAX 1200
int main(int argc,char* argv[]){
    int nready,efd,res;
    int i,maxi,listenfd,connfd,sockfd;
    char ans[]="I get it!\n";
    char bns[]="One has gone!\n";
    ssize_t n;
    int client[OPEN_MAX],id[OPEN_MAX];
    char buf[MAXLINE];
    char str[INET_ADDRSTRLEN];
    socklen_t cliaddr_len;
    struct sockaddr_in cliaddr,servaddr;
    struct epoll_event tep,ep[OPEN_MAX];

    listenfd=Socket(AF_INET,SOCK_STREAM,0);
    bzero(&servaddr,sizeof(servaddr));
    servaddr.sin_family=AF_INET;
    servaddr.sin_addr.s_addr=htonl(INADDR_ANY);
    servaddr.sin_port=htons(SERVER_PORT);
    Bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr));
    Listen(listenfd,20);
    for(i=0;i<OPEN_MAX;i++)client[i]=-1;
    efd=epoll_create(OPEN_MAX);
    if(efd==-1)perr_exit("epoll_create");

    tep.events=EPOLLIN;tep.data.fd=listenfd;
    res=epoll_ctl(efd,EPOLL_CTL_ADD,listenfd,&tep);
    if(res==-1)perr_exit("epoll_ctl");
    while(1){
        nready=epoll_wait(efd,ep,OPEN_MAX,-1);
        if(nready<0)perr_exit("epoll_wait");
        for(i=0;i<nready;i++){
            if(ep[i].events&EPOLLIN==0)continue;
            if(ep[0].data.fd==listenfd){
                cliaddr_len=sizeof(cliaddr);
                connfd=Accept(listenfd,(struct sockaddr*)&cliaddr,&cliaddr_len);
                printf("received from %s at PROT %d\n",
                inet_ntop(AF_INET,&cliaddr.sin_addr,str,sizeof(str)),
                ntohs(&cliaddr.sin_port));
                int j;for(j=0;j<OPEN_MAX;j++){
                    if(client[j]<0){
                        client[j]=connfd;
                        id[connfd]=j;
                        break;
                    }
                }
                if(j==OPEN_MAX){
                    fputs("too many clients\n",stderr);
                    exit(1);
                }
                tep.events=EPOLLIN;tep.data.fd=connfd;
                res=epoll_ctl(efd,EPOLL_CTL_ADD,connfd,&tep);
                if(res==-1)perr_exit("epoll_ctl");
            }
            else {
                sockfd=ep[i].data.fd;
                if((n=Read(sockfd,buf,MAXLINE))<0){
                    if(errno==ECONNRESET){
                        Write(STDOUT_FILENO,bns,sizeof(bns));
                        res=epoll_ctl(efd,EPOLL_CTL_DEL,sockfd,NULL);
                        if(res==-1)perr_exit("epoll_ctl");
                        client[id[sockfd]]=-1;Close(sockfd);
                    }
                    else perr_exit("read error");
                }
                else if(n==0){
                    Write(STDOUT_FILENO,bns,sizeof(bns));
                    res=epoll_ctl(efd,EPOLL_CTL_DEL,sockfd,NULL);
                    if(res==-1)perr_exit("epoll_ctl");
                    client[id[sockfd]]=-1;Close(sockfd);
                }
                else {
                    int j;
                    for(j=0;j<n;j++)buf[j]=toupper(buf[j]);
                    Write(STDOUT_FILENO,buf,n);
                    Write(sockfd,ans,sizeof(ans));
                }
            }
        }
    }
    close(listenfd);
    close(efd);
    return 0;
}

client.c

#include<errno.h>
#include<semaphore.h>
#include<string.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<errno.h>
#include<stdlib.h>
#include<unistd.h>
#include<stdio.h>
#include<sys/mman.h>
#include<sys/types.h>
#include<signal.h>
#include<pthread.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<sys/socket.h>
#define SERVER_PORT 8000
#define MAXLINE 4096
int main(){
    struct sockaddr_in serveraddr;
    int confd,len;
    char ipstr[]="192.168.133.129";
    char buf[MAXLINE];

    confd=socket(AF_INET,SOCK_STREAM,0);

    bzero(&serveraddr,sizeof(serveraddr));
    serveraddr.sin_family=AF_INET;
    inet_pton(AF_INET,ipstr,&serveraddr.sin_addr.s_addr);
    serveraddr.sin_port=htons(SERVER_PORT);

    connect(confd,(struct sockaddr*)&serveraddr,sizeof(serveraddr));
    while(fgets(buf,sizeof(buf),stdin)){
        write(confd,buf,strlen(buf));
        len=read(confd,buf,sizeof(buf));
        write(STDOUT_FILENO,buf,len);
    }
    close(confd);
    return 0;
}