> Hi! > > Some days ago I've faced with the following problem: > I need some kind of action (while coding user space > program actively handling the serial port) to get > sure all the bytes I've wrote to it are _transmitted_. > I know about "ioctl(fd, TIOCDRAIN)", but this ioctl > is accomplished with tty buffers draining to (probably) > FIFO buffer of the serial port. Is there any (portable > preferably) way to get an acknolege or to block until > FIFO buffer is cleared? The situation is that I can't > simply write additional 64 bytes (I did not see any > serial ports with FIFO larger than 64 bytes) and > drain the tty buffers - I have to catch the exact > moment ...
You could close the device, but that may have an adverse effect on your application, as it will drop DTR. There is no other way, no. -- \\ The mind's the standard \\ Mike Smith \\ of the man. \\ msm...@freebsd.org \\ -- Joseph Merrick \\ msm...@cdrom.com To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message
