1.5.18 ( 0.132/4/2 ) - read() - blocks ( serial programming )
Igor Pechtchanski
pechtcha@cs.nyu.edu
Tue Aug 23 19:09:00 GMT 2005
On Tue, 23 Aug 2005, pppd wrote:
> Hello guys,
>
> I´m working to convert a Linux application to work with Windows
> XP under Cygwin 1.5.18 ( 0.132/4/2 ). Ncurses package and parallel port
> programming works without changes ( congratulations ). I have a problem
> with serial programming.
>
> First, I did two C files: ( attached )
>
> setcmc7.c - Sets serial configuration through Win32 API. ( Linux
> termios settings/functions doesn't work for me :-( ).
> cmc7.c - Read caracters from serial.
>
> After setting serial configuration by setcmc7.c I can read serial port
> using cmc7.
>
> My doubt is: Why read() function blocks the terminal (keyboard) until
> read a caracter ? At Linux it's work fine ( same code ).
>
> My application needs to read keyboard at the same time with serial.
> I have tried some flags with open ( O_NONBLOCK, O_NDELAY .. )
> unfortunately doesn't work too.
>
> Does anybody can help me please?
I doubt the same code works on Linux, since open("COM1") will fail there.
You need to open something that Cygwin knows is a serial port, i.e.,
"/dev/ttyS0" (or "/dev/com1", but not "COM1").
Plus, you can probably write setcmc7.c using Cygwin calls as well (instead
of Win32, that is).
Igor
--
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