CODEWITHSUNDEEP
clinuxcentosusb
Martin
Martin

Reputation: 4030

usb connection event on linux without udev or libusb

I need to find a way to detect when a usb device is plugged in C on an old embedded Linux (CentOs 4).

libudev and libusb are not available so I'm a little clueless with my options here. There is dbus, however I cannot use udisks as the device I need to detect is not a storage device.

Thanks.

Upvotes: 3

Views: 1561

Answers (1)

Christophe Vu-Brugier
Christophe Vu-Brugier

Reputation: 2731

You can try to write a custom script and register it in /proc/sys/kernel/hotplug. When a uevent occurs, the kernel will invoke your script and pass the subsystem (usb in your case) as an argument. Then you will have to match the device (I don't know how to do that, that's probably the most tricky part).

Skeleton for your custom hotplug script that matches the USB subsystem:

$ cat my_hotplug.sh 
#!/bin/sh

[ "$1" = usb ] || exit 0
echo "Do something here"

Registering your hotplug script as the uevent helper:

echo /path/to/my_hotplug.sh > /proc/sys/kernel/hotplug

Upvotes: 3

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