On Apr 3, 2014, at 3:40, trifle menot <trifleme...@gmail.com> wrote: > On 4/2/14, Mihai Popescu <mih...@gmail.com> wrote: > >> Dude, what the hell are you trying to do? Just explain in plain words here. >> I am interested in working with rs232 >> and i wasted my time reading and wainting for your damn problem. > [...] > > Now suppose VTIME was an overall timer, not an interbyte timer. In 0.1 > seconds at 115200, you can transfer about 1100 bytes. At that speed, > VMIN will kick in before the timer expires, and read() will return > with approx. 250 bytes. If you get a block < 250 bytes, you will never > wait more than 0.1 seconds for it, even in the worst case, a steady 11 > cps. > > The POSIX writers erred by making VTIME an interbyte timer. >
The meaning of VMIN, VTIME change depending on if they are non-zero or not. VTIME is not always an inter-character timer, but they way you are using it, it is. There is a nice overview here: http://unixwiz.net/techtips/termios-vmin-vtime.html -- jdv
