nonblock recvfrom

最新推荐文章于 2023-08-05 10:56:42 发布

翻译最新推荐文章于 2023-08-05 10:56:42 发布 · 824 阅读

linux 专栏收录该内容

30 篇文章

订阅专栏

本文详细介绍了使用socket进行非阻塞读取操作，并通过设置超时时间来避免长时间等待无响应数据的情况。通过设置fcntl函数为O_NONBLOCK模式，实现了高效的socket数据接收流程。

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
}
}