Re: filepath-on-device to BSD-devpath-of-that-device
Re: filepath-on-device to BSD-devpath-of-that-device
- Subject: Re: filepath-on-device to BSD-devpath-of-that-device
- From: Peter Bierman <email@hidden>
- Date: Wed, 25 Apr 2007 13:05:29 -0700
At 7:38 PM +0000 4/25/07, Chase wrote:
How do I get a BSD device path string (eg: "/dev/rdisk3") that represents
the path to the device that holds a file for which I have a path string
(eg: "/Volumes/SOME_DATA_CD/A_SUB_FOLDER/THE_FILE.txt")?
I can get the dev_t number of the device using stat(), but I'm not sure
what to do with that number to get an actual path to the raw device.
... or maybe the stat() step is unnecessary altogether.
So (to sum up)...
How do I get a string like "/dev/rdisk3" starting with only the
string "/Volumes/SOME_DATA_CD/A_SUB_FOLDER/THE_FILE.txt" ?
statfs() takes a path to any file on a given filesystem.
It returns f_mntonname, which is the mountpoint for the fs
(/Volumes/foo) and f_mntfromname, which is the device node
(/dev/disk0s3).
If you need the unbuffered device, you'll have to add the 'r'
yourself. (/dev/rdisk0s3)
-pmb
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