[nSLUG] Re: /dev/ttyS0: open from Perl ?? [An answer found]

Jeff Warnica jeffw at chebucto.ns.ca
Thu Mar 11 01:44:22 AST 2004


On Wed, 2004-03-10 at 23:28, Mike wrote:
> jeff> CPAN is your friend.  Look at Device::SerialPort.
> 
> Hah!  Okay.  Well, as far as I can puzzle out on short notice, the
> part of Device::SerialPort that opens a dialogue with /dev/ttyS0 is
> just a front end for IO::Handle which is a front end for open().

Well, yes. And its all just a front end to NAND gates.

> But I think I have the answer:  open( /dev/$THE_SERIAL_PORT... will
> hang waiting for DCD to go high if clocal is off.  It's off by default
> on my machine.  If I run:
> 
>    stty -F /dev/ttyS0 clocal

Device::SerialPort handles that stuff for you at a much higher level.
The example programs it includes I stripped down for my purpose.





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