Messages in this thread | | | Date | Mon, 07 Jan 2002 12:36:32 -0800 | From | David Brownell <> | Subject | Re: Hardware Inventory [was: Re: ISA slot detection on PCI systems?] |
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> > /sbin/hotplug is called from the kernel only, right? > > Right. But there's no reason it can't be called from any other place. > It's just a userspace program with a well documented interface :)
Actually, it's already called from other places ... :) /sbin/hotplug is called from the init.d/hotplug startup script.
There's a period during initial system boot when not all filesystems or system services are available. When the kernel calls out to /sbin/hotplug in such a situation, hotplugging can't yet do it's job.
It's too early, the system isn't "hot" yet ... which is why I call this problem the "coldplug" issue. Even simple device setup operations like modprobing may not be possible, much less more complex ones like alerting/starting daemons. So the init.d/hotplug script, invoked later, fakes hotplug events to make sure the same setup gets done, without requiring users to unplug/replug devices.
- Dave
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