有没有办法暂停从stdin的阅读,以便程序不要挂起太久？
- read(0,var,numberofbytes);
解决方法
您可以使用
ncurses,或者您不想使用,可以使用本
blog post中所述的选择.基本上,您可以使用select并指定超时.如果stdin FD被设置,那么你可以安全地读取,不会阻塞.如果你想要更多的信息选择,请检查
this,当然是
wikipedia.这是一个方便的电话来了解.
编辑：我觉得被迫提供代码,所以在这里是直接从博客文章与一些评论.
- // if != 0,then there is data to be read on stdin
- int kbhit()
- {
- // timeout structure passed into select
- struct timeval tv;
- // fd_set passed into select
- fd_set fds;
- // Set up the timeout. here we can wait for 1 second
- tv.tv_sec = 1;
- tv.tv_usec = 0;
- // Zero out the fd_set - make sure it's pristine
- FD_ZERO(&fds);
- // Set the FD that we want to read
- FD_SET(STDIN_FILENO,&fds); //STDIN_FILENO is 0
- // select takes the last file descriptor value + 1 in the fdset to check,// the fdset for reads,writes,and errors. We are only passing in reads.
- // the last parameter is the timeout. select will return if an FD is ready or
- // the timeout has occurred
- select(STDIN_FILENO+1,&fds,NULL,&tv);
- // return 0 if STDIN is not ready to be read.
- return FD_ISSET(STDIN_FILENO,&fds);
- }
