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I'm running a Ubuntu system where USB drives are mounted automatically.
I'm curious to what happens when a USB device plugs in a port. Which part of the linux senses that a new device has been plugged in? After that which processes (and what is the caller or callers) are called to mount it to the system? Are theese kernel-space, user-space processes or mixed ?

I'd like to follow theese steps in a C/C++ program. Is there any way to do that? Where could I read more about it? How would you do it?

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    The Wikipedia page on udev is a pretty good place for an overview... Commented Oct 19, 2012 at 7:04

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As far as I know, there are several systems that can be used to react to a plugged-in USB device. One is udev, and this runs as root. You can put your own rules and scripts in /etc/udev/rules.d.

Furthermore, the desktop environments all implement some automounting, see for example this guide. See also the answer to this question.

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