Linux网络编程---服务器端基本框架

/*	服务器		          
话机	：socket        
绑定：bind
多路：listen
等待：accept				
接通：新socket
总机等别的电话，分机跟客户通信
通信：write/read 		
挂断分机：close
*/
#include<pthread.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<stdio.h>
#include<string.h>
#include<fcntl.h>
#include<stdlib.h>
struct Param
{
	int fc;
	char ip[16];
};
void* func(void* p)
{
	struct Param* r = p;
	for(;;){
		//printf("1\n");
		//write(r->fc,"abc",3);//原样返回发到客户端
		char msg[1000];
		int n=read(r->fc,msg,sizeof(msg)-1);//读取来自客户端的信息
		//printf("n:%d\n",n);
		if(n<=0)//检查是否出错，关闭
			break;
		if(msg[0]=='q') break;
		write(r->fc,msg,n);//原样返回发到客户端
		msg[n] = '\0';//加上字符串结束标记
		printf("%s:%s\n",r->ip,msg);//显示到屏幕上
	}
	close(r->fc);
	printf("%s退出\n",r->ip);
}
int main()
{
	int fd = socket (AF_INET,SOCK_STREAM,0);//创建套接字
	//AF_INET-v4,AF_INET6 v6
	//SOCK_STREAM--tcp,SOCK_DGRAM---udp
	if(fd<0){
		perror("socket");return -1;
	}
	struct sockaddr_in si;
	si.sin_family = AF_INET;
	si.sin_addr.s_addr = htonl(INADDR_ANY);//0表示本机地址
	si.sin_port = htons(8888);//1024以下的端口有专门用途
	//bind(int,sockaddr*,size_t)
	if(bind(fd,(struct sockaddr*)&si,sizeof(si))<0){
		perror("bind");return -1;
	}
	listen(fd,10);//允许同时有10个接入请求
	for(;;){
		struct sockaddr_in c;
		socklen_t len = sizeof(c);//必须初始化成本地套接信息长度
		int fc = accept(fd,(struct sockaddr*)&c,&len);//等待客户连接，返回一个跟客户相连的新套接字，
		if(fc<0) continue;
		char ip[16];
		inet_ntop(AF_INET,&c.sin_addr,ip,sizeof(ip));
		printf("%s 到此一游\n",ip);
		char msg[1000];
		sprintf(msg,"YOU IP:%s,WELCOME\n",ip);
		write(fc,msg,strlen(msg));
		write(fc,"123\n",4);
//		close(fc);	
		pthread_t id;
		//struct Param* p = malloc(sizeof(struct Param));//不知道为什么不能用指针，用指针就读取不了
		struct Param p;
		p.fc = fc;
		//printf("p->fc %d\n",p->fc);
		strcpy(p.ip,ip);
		pthread_create(&id,NULL,func,(void*)&p);
		//free(p);//释放动态内存
		//ip=NULL;
	}	
}