c socket server 获取client ip,port

client = accept(listener,(struct sockaddr *) &their_addr, &socklen);
if(client < 0){
　　 if(errno != EAGAIN && errno != ECONNABORTED && errno != EPROTO && errno != EINTR)
 　　perror("accept1");
 　　continue;
 }

char buf[100];
sprintf(buf,"accept from %s %d",inet_ntoa(their_addr.sin_addr),their_addr.sin_port);
printf(" %s",buf);
// accept from 192.168.31.112 7900
client = accept(listener,(struct sockaddr *