Date: Thu, 27 May 1999 11:37:56 -0700 From: Mike Smith <mike@smith.net.au> To: Max Gotlib <max@cca.usart.ru> Cc: hackers@freebsd.org Subject: Re: Serial ports programming Message-ID: <199905271837.LAA01313@dingo.cdrom.com> In-Reply-To: Your message of "Thu, 27 May 1999 11:57:41 %2B0600." <Pine.LNX.3.95.990527114907.31382B-100000@linux.cca.usart.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
> 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. \\ msmith@freebsd.org \\ -- Joseph Merrick \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199905271837.LAA01313>