多进程实现NTP服务器
多进程实现NTP服务器
服务器端：server.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <time.h>
#include <unistd.h>
#include "proto.h"
#define IPSIZE 40
static void func(int fd) //获取时间戳传给客户端
{
FILE *fp = fdopen(fd,"r+");
fprintf(fp,FMT,(long long)time(NULL));
sleep(20); //测试
fclose(fp);
}
int main()
{
int ret;
int lfd,newfd;
struct sockaddr_in laddr,raddr;
socklen_t lenth;
char ip[IPSIZE];
pid_t pid;
lfd = socket(AF_INET,SOCK_STREAM,0); //创建socket
if(lfd <0)
{
perror("socket()");
exit(1);
}
int val =1;
ret = setsockopt(lfd,SOL_SOCKET,SO_REUSEPORT,&val,sizeof(val)); //设置端口复用
if(ret <0)
{
perror("setsockopt()");
exit(1);
}
laddr.sin_family = AF_INET; //初始化结构体
laddr.sin_port = htons(atoi(PORT));
inet_pton(AF_INET,"0.0.0.0",&laddr.sin_addr.s_addr);
ret = bind(lfd,(void *)&laddr,sizeof(laddr)); //绑定端口和IP
if(ret<0)
{
perror("bind()");
exit(1);
}
ret = listen(lfd,200); //监听最大200
if(ret <0)
{
perror("listen()");
exit(1);
}
lenth = sizeof(raddr);
while(1)
{
newfd = accept(lfd,(void *)&raddr,&lenth); //等待客户端连接
if(newfd<0)
{
perror("accpt()");
break;
}
pid = fork(); //创建子进程
if(pid<0)
{
perror("fork()");
close(newfd);
break;
}
else if(pid ==0) //子进程
{
close(lfd); //关闭服务器端socket文件描述符
inet_ntop(AF_INET,&raddr.sin_addr.s_addr,ip,IPSIZE);
printf("-----IP:%s PORT:%d-----\n",ip,ntohs(raddr.sin_port));
func(newfd);
exit(0);
}
else //父进程
close(newfd); //关闭客户端socket文件描述符
}
close(lfd);
exit(0);
}
其他参考：
