On Tue, 22 Aug 2006, Ernesto Paiser wrote:
> Hello Corinna,
FYI, this is a mailing list, and unless you're replying to a specific
message, you're actually talking to many people.
> I have problems with read() function blocking and
> waiting for characters on serial line with cygwin:
>
> Here are some code fragments:
> ========================================================
> fd = open(sl, O_RDWR | O_NOCTTY | O_NONBLOCK | O_NDELAY)
>
> newpio.c_cflag = brate | CS8 | CLOCAL | CREAD;
> newpio.c_iflag = IGNPAR | ICRNL;
> newpio.c_oflag = 0;
> newpio.c_lflag = 0;
> newpio.c_cc[VTIME] = 1;
> newpio.c_cc[VMIN] = 0;
> ...
>
> n = ioctl(fd, TIOCINQ, &n); //It gives me an error (return -1) why??!!!
>
> and
>
> n = read(fd, buffer, 1); <<< HERE IS BLOCKING!!!
> ========================================================
>
> TIOCINQ is working on CYGWIN,
>
> Is there another way to solve this problem???
Please post a complete compilable test case that reproduces the problem.
For example, in the above code, it's unclear what the variable sl contains
(and I suspect it contains "COM1", which is a no-no -- you should be using
"/dev/ttyS0").
Igor
--
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