Controlling Hardware with ioctls

Once you learn the ioctl system call, you'll be able to check the status of the Ethernet link light and other miscellaneous but important facts about hardware.


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how to get serial port

kiransing Paradeshi(MDL) ,Bangalore's picture

how to get serial port address using ioctl


kiran's picture

how to get serial port address using ioctl

Re: Controlling Hardware with ioctls

gmc's picture

Not that I didn't read the article with interest, but are you aware of a ifplugd (, a nifty little tool that does exactly what you want. On my laptop I have mandrake, I configure the network to not start on boot up. Furthermore, I start ifplugd somewhere along the boot-up sequence. As soon as ifplugd sees a cable, it will run your distributions ifup command, and if it detects the cable is gone: ifdown.


Re: Controlling Hardware with ioctls

Alban's picture

The article was exactly what I was looking. But when I tried the small script provided on the web site, my ethernet card went crazy. When I turn it on, it interferes with my GNOME environment and I cannot open new windows. However the network connection is fine somehow. Just to check, I tried it under windows and I cannot use it at all. Something has changed and I would like to fix it. Any idea?

I have a Thinkpad T40 with an Intel Gb/ethernet card:
02:01.0 Ethernet controller: Intel Corp.: Unknown device 101e (rev 03). I'm using Debian with a 2.4.24 kernel.