Hi Everyone,
I'm trying to trackdown a problem using my dialup modem. I have a
program that opens the modem and watches caller id's. It flashes the
hook when a telemarketer calls. It works well until...
When another program opens the modem then my program starts reading
intermittent responses intended for the other program.
I cannot seem to open the device in exclusive mode. The current open
is (I also tried with O_EXCL):
int modem = open(device_path, O_RDWR | O_NOCTTY | O_SYNC);
I'm not sure if it because udev configures the device incorrectly or
the kernel driver is configured incorrectly. Or maybe it is impossible
to do.
Does anyone know how I can make the device exclusive?
Thanks in advance.
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