On 2009-04-11, Dennis Lee Bieber <wlfr...@ix.netcom.com> wrote: >> You can write a port redirector in user-space in MS-Windows, >> but you can't in Linux/Unix. On Unix systems you have to write >> a kernel module that sits below the tty layer. The tty layer >> is what user applications talk to with open/close/read/write/ioctl >> calls. > > Extending to the point of absurdity... Does the machine have a > physical serial port from which the application could read?
I believe not. > Does the machine have a USB port? Definitely. All Mac's have had USB ports for a long, long time > What would setting a pair of serial ports (possibly one or > both using USB<>Serial adapters) with a null modem between > them give? That should work as long as the application isn't trying to do timing-critical tricks with the modem control and status lines. Such tricks don't work well with USB attached serial ports. > Could the application read from one, while Python is writing > to the other? Yup. > Yes, it IS an absurd klutz, but... Sadly, if a pty won't work, that's probably the easiest solution. You can get USB-serial adapters from newegg for under $10. For a slightly less ugly kludge, you can get a dual-port one for $25. And when you need to test the effects of a high-latency, low-bandwith WAN connection on something, you can plug them together with a null-modem cable, set them up as PPP interfaces running at 1200 baud, and route network traffic through them. -- Grant -- http://mail.python.org/mailman/listinfo/python-list