Updated mdev

[Frank Sorenson]

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Rob Landley wrote:
> On Tuesday 13 December 2005 02:27, Frank Sorenson wrote:
> Um, I took your previous version and extensively rewrote it myself.

Okay.  I knew I should have waited to see what you cooked up :)

> I chopped out the hotplug with an eye to adding it back later.  Is the netlink 
> stuff the only way to do this, or does /sbin/hotplug still work?

/sbin/hotplug will work as well.  Changing /proc/sys/kernel/hotplug to
mdev appears to execute mdev with one argument (the subsystem) and
several environment variables (these are the ones I've observed.  There
may be more):
ACTION - set to either "add" or "remove"
DEVPATH - set to the path inside /sys where the dev entry can be found
SUBSYSTEM - the subsystem the device belongs to
PHYSDEVBUS
PHYSDEVDRIVER
SEQNUM - a counter of the number of events
MAJOR
MINOR

ACTION, DEVPATH, MAJOR, and MINOR appear to be the most useful.

Some examples (ACTION DEVPATH MAJOR:MINOR):
add /block/sda/sda1 8:1
add /class/misc/tun 10:200
remove /class/misc/tun 10:200
remove /block/sda 8:0
remove /class/usb_device/usbdev1.32 189:31

Frank
- --
Frank Sorenson - KD7TZK
Systems Manager, Computer Science Department
Brigham Young University
frank at tuxrocks.com
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