实现简单QQ聊天功能

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <netinet/in.h>
#include <pthread.h>
void *recever(void *arg)//接收线程
{    int fd1 = (int)arg;    printf("fd1 = %d\n",fd1);    while (1)    {    char buf[128] = "";    char ip_str[16] = "";    struct sockaddr_in from_addr;    socklen_t socklen = sizeof(from_addr);    ssize_t ret = recvfrom(fd1,buf,sizeof(buf),0,(struct sockaddr *)&from_addr,&socklen);    if(ret < 0)    {        perror("recvfrom:");        break;    }    inet_ntop(AF_INET,&from_addr.sin_addr.s_addr,ip_str,16);    printf("%s %u %s \n",ip_str,ntohs(from_addr.sin_port),buf);    }    
}
void *sende*r(void *arg)//发送线程
{    char ip_str[16] = "";    unsigned short port = 0;    int fd1 = (int)arg;    printf("fd1 = %d\n",fd1);    char buf[128] = "";    char *buf_p = fgets(buf,sizeof(buf),stdin);//fgets能获取换行符  
  buf[strlen(buf)-1] = '\0';             struct sockaddr_in dst_addr;        while (1)    {         if(strncmp(buf,"sayto",strlen("sayto")) == 0)    {        bzero(&dst_addr,sizeof(dst_addr));        dst_addr.sin_family = AF_INET;        sscanf(buf,"sayto %s %hu",ip_str,&port);        inet_pton(AF_INET,ip_str,&dst_addr.sin_addr.s_addr);        dst_addr.sin_port = htons(port);       
    sendto(fd1,"hello",strlen("hello"),0,(struct sockaddr *)&dst_addr,sizeof(dst_addr));        continue;    }    else    {        sendto(fd1,buf,strlen(buf),0,(struct sockaddr *)&dst_addr,sizeof(dst_addr));
    }    }  }
    int main(int argc,char *argv[]) 
    {    
    //创建回收资源    void *arg = NULL;  
      //创建一个用于通信套接字   
       int fd = socket(AF_INET,SOCK_DGRAM,0);    
       printf("fd = %d\n",fd);    
       //绑定固定的ip 和端口   
        struct sockaddr_in my_addr;    
        bzero(&my_addr,sizeof(my_addr)); 
           my_addr.sin_family = AF_INET;  
             my_addr.sin_port = htons(8080); 
                my_addr.sin_addr.s_addr = htonl(INADDR_ANY);//绑定本地主机所有ip    
                bind(fd,(struct sockaddr *)&my_addr,sizeof(my_addr));    //创建接收和发送线程  
                  pthread_t receve,send;    pthread_create(&receve,NULL,recever,(void *)fd);    pthread_create(&send,NULL,sender,(void *)fd);   //回收线程资源  
                    pthread_join(receve,&arg);    			pthread_join(send,&arg);  
                    //关闭套接字    
                    close(fd);    return 0;}
```*