[argyllcms] Re: ubuntu-10.10-desktop-amd64: dispcal -D5 -? hangs
- From: Martin Johnson <rindlis@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 21 Apr 2011 04:19:07 -0700 (PDT)
In addition, this morning after booting up, I had to redo the clocal flag
setting on all my tty's.
Looks like this flag is not persistent.
Martin
--- On Thu, 4/21/11, Graeme Gill <graeme@xxxxxxxxxxxxx> wrote:
> From: Graeme Gill <graeme@xxxxxxxxxxxxx>
> Subject: [argyllcms] Re: ubuntu-10.10-desktop-amd64: dispcal -D5 -? hangs
> To: argyllcms@xxxxxxxxxxxxx
> Date: Thursday, April 21, 2011, 4:06 AM
> Gerhard Fuernkranz wrote:
> >> If open() blocks on a serial port, then a typical
> reason is that modem control is enabled for this tty (i.e.
> the CLOCAL flag not set, see "man termios"), but the
> attached device does not assert the DSR signal. I.e. open()
> waits until the device reports "I am ready".
> >
> > Invoke "stty -a -F /dev/ttyS2" in order to check the
> settings of the tty. Look for "clocal" (-> no modem
> control) versus "-clocal" (-> modem control) in the
> output.
>
> Hi Gerhard,
> is there anything I could do from a
> progromatic point of
> view to avoid such a hang ?
>
> Presumably I don't want to alter the CLOCAL flag for a
> serial port that
> isn't connected to an instrument. Perhaps there's a better
> way of
> getting a list of potential instrument serial ports that
> doesn't
> involve opening them ?
>
> cheers,
> Graeme.
>
>
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