与多进程实现对比来看。
示例来源于网络视频
#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...\n", ts->connfd);
break; //跳出循环,关闭cfd
}
printf("received from %s at PORT %d\n",
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 ...\n");
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;
}