Strange hang on open (DS9097 via ch341-uart converter

Hi,

I'm experiencing strange hangs on open in owAcquire (userial/ds9097/linuxses.c). I've straced and debuged the hang but was curios as minicom seems to work fine.

I've decided to be bold and add the flags O_NOCTTY|O_NONBLOCK and this seemed to have helped the issue.

The line now reads:
   if ((fd[portnum] = open(port_zstr, O_RDWR|O_NOCTTY|O_NONBLOCK )) == -1)

Regards,

Markus
