nonblock recvfrom

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if (-1 == fcntl(iSocketfd, F_SETFL, O_NONBLOCK)) { printf(“fcntl socket error!\n”); return -1; } int iSocketLen = sizeof(struct sockaddr_in);

/* set recvfrom from server timeout */ struct timeval tv; fd_set readfds; for(;;) { tv.tv_sec = TIME_OUT_TIME; tv.tv_usec = 0; FD_ZERO(&readfds); FD_SET(iSocketfd, &readfds); if (select(iSocketfd+1,&readfds,NULL, NULL, &tv) > 0) { iRecvNum = recvfrom(iSocketfd,(void *)stRecvBuf,sizeof(*(stRecvBuf)),0, (struct sockaddr *)stRemote,&iSocketLen); if (-1 == iRecvNum) { printf(“received data error!\n”); } printf(“iRecvNum is %d\n”,iRecvNum); } else { printf(“timeout!there is no data arrived!\n”); //return -1 } }

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