Re: How to determine if the system is started up from firewire disk
Re: How to determine if the system is started up from firewire disk
- Subject: Re: How to determine if the system is started up from firewire disk
- From: "Chris Suter" <email@hidden>
- Date: Wed, 10 Sep 2008 13:23:01 +1000
On Wed, Sep 10, 2008 at 10:10 AM, Ryota Tsukiashi
<email@hidden>wrote:
> I am writing a cocoa application for our firweire device. I need to
> know if the system is started up from firewire disk. For PowerPC with
> Mac OSX 10.4/10.5, I have used information from "nvram boot-device".
> For IntelMac with 10.4/10.5, I have used "nvram efi-boot-device". I am
> not sure if it is a proper way, but it has been working OK.
No, it's not the right way. That will only tell you what the start up disk
is set to which isn't necessarily what you started from (for example, you
could have booted by holding down the Option key).
One way to do this is to use fsstat on "/" to get the BSD information and
then use IOKit (IOServiceGetMatchingService) to find the device that refers
to and then you might have to go up the hierarchy until you hit the level
you want.
There might be easier ways to do this; that's just the one I first thought
of.
-- Chris
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