并发服务器

多进程并发服务器

#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<arpa/inet.h>
#include<ctype.h>
#include<strings.h>
#include<sys/wait.h>
#include"wrap.h"
#define SERV_PORT 8888
#define SERV_IP "192.227.231.111"

void wait_child(int sign)
{
	while(waitpid(0,NULL,WNOHANG)>0);
	return ;
}
int main()
{
	pid_t pid;
	int lfd,cfd;
	lfd=Socket(AF_INET,SOCK_STREAM,0);

 　　　　int opt = 1;
　　　　 setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));  //设置端口复用

	struct sockaddr_in serv_addr,clie_addr;
	socklen_t clie_addr_len;
	clie_addr_len=sizeof(clie_addr);
	
	bzero(&serv_addr,sizeof(serv_addr));
	serv_addr.sin_family=AF_INET;
	serv_addr.sin_port=htons(SERV_PORT);
	
	//serv_addr.sin_addr.s_addr=htonol(INADDR_ANY); 使用可用的ip
	//指定ip  用inet_pton转换
	inet_pton(AF_INET,SERV_IP,&serv_addr.sin_addr.s_addr);
	Bind(lfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr));
	
	Listen(lfd,128);
	
	char buf[BUFSIZ],buf_ip[BUFSIZ];
	int n,i;
	while(1)
	{
		cfd=Accept(lfd,(struct sockaddr*)&clie_addr,&clie_addr_len);
	
		printf("client:%s port:%d has connected",inet_ntop(AF_INET,&clie_addr.sin_addr.s_addr,buf_ip,sizeof(buf_ip)),ntohs(clie_addr.sin_port));
		pid=fork();
		if(pid<0)
		{
				perror("fork err");
				exit(1);
		}else if(pid==0)
		{
			close(lfd);
			break;
	
		}else{
			close(cfd);	
			signal(SIGCHLD,wait_child);
			
		}
	}
	if(pid==0)
	{
		while(1)
		{
			n=Read(cfd,buf,sizeof(buf));
			if(n==0)
			{
				close(cfd);
				return 0;//client close
			}else if(n==-1)
			{
				perror("read err");
				exit(1);
			}else{
				for(i=0;i<n;i++)
				{
					buf[i]=toupper(buf[i]);
				}
			}
			
			write(cfd,buf,n);
		}
	}
		
}

　

多线程并发服务器

#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <ctype.h>
#include <unistd.h>
#include <fcntl.h>

#include "wrap.h"

#define MAXLINE 8192
#define SERV_PORT 8000

struct s_info {                     //定义一个结构体, 将地址结构跟cfd捆绑
    struct sockaddr_in cliaddr;
    int connfd;
};

void *do_work(void *arg)
{
    int n,i;
    struct s_info *ts = (struct s_info*)arg;
    char buf[MAXLINE];
    char str[INET_ADDRSTRLEN];      //#define INET_ADDRSTRLEN 16  可用"[+d"查看

    while (1) {
        n = Read(ts->connfd, buf, MAXLINE);                     //读客户端
        if (n == 0) {
            printf("the client %d closed...
", ts->connfd);
            break;                                              //跳出循环,关闭cfd
        }
        printf("received from %s at PORT %d
",
                inet_ntop(AF_INET, &(*ts).cliaddr.sin_addr, str, sizeof(str)),
                ntohs((*ts).cliaddr.sin_port));                 //打印客户端信息(IP/PORT)

        for (i = 0; i < n; i++) 
            buf[i] = toupper(buf[i]);                           //小写-->大写

        Write(STDOUT_FILENO, buf, n);                           //写出至屏幕
        Write(ts->connfd, buf, n);                              //回写给客户端
    }
    Close(ts->connfd);

    return (void *)0;
}

int main(void)
{
    struct sockaddr_in servaddr, cliaddr;
    socklen_t cliaddr_len;
    int listenfd, connfd;
    pthread_t tid;
    struct s_info ts[256];      //根据最大线程数创建结构体数组.
    int i = 0;

    listenfd = Socket(AF_INET, SOCK_STREAM, 0);                     //创建一个socket, 得到lfd

    bzero(&servaddr, sizeof(servaddr));                             //地址结构清零
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);                   //指定本地任意IP
    servaddr.sin_port = htons(SERV_PORT);                           //指定端口号 8000

    Bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr)); //绑定

    Listen(listenfd, 128);      //设置同一时刻链接服务器上限数

    printf("Accepting client connect ...
");

    while (1) {
        cliaddr_len = sizeof(cliaddr);
        connfd = Accept(listenfd, (struct sockaddr *)&cliaddr, &cliaddr_len);   //阻塞监听客户端链接请求
        ts[i].cliaddr = cliaddr;
        ts[i].connfd = connfd;

        /* 达到线程最大数时，pthread_create出错处理, 增加服务器稳定性 */
        pthread_create(&tid, NULL, do_work, (void*)&ts[i]);
        pthread_detach(tid);                                                    //子线程分离,防止僵线程产生.
        i++;
    }

    return 0;
}