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: "Ryota Tsukiashi" <email@hidden>
- Date: Wed, 10 Sep 2008 17:26:34 -0700
Hi Chris,
Thank you. I will try FSMegaInfo as well.
Ryota
2008/9/10 Ken Thomases <email@hidden>:
> On Sep 9, 2008, at 10:23 PM, Chris Suter wrote:
>
>> 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.
>
> The Disk Arbitration framework may be easier to use than IOKit.
>
> You might look at the FSMegaInfo sample code for inspiration regarding other
> techniques:
>
> http://developer.apple.com/samplecode/FSMegaInfo/index.html
>
> Cheers,
> Ken
>
>
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