April 2009 - Darwin-dev - lists.apple.com

Re: Getting list and information of Volumes (mounted and unmounted)
by vishal chauhan 24 Apr '09

24 Apr '09

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Re: help needed with getmntinfo()
by Terry Lambert 23 Apr '09

23 Apr '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com -- Terry _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… On Apr 23, 2009, at 4:32 AM, Steve Checkoway wrote: On Apr 23, 2009, at 4:18 AM, Terry Lambert wrote: If you absolutely have to go though /Volumes for some bizarre and unexplainable reason, then you will need to lstat the path, see that it's a symbolic link, and use readlink(2) to read the link target, then use the link target as the path instead, internally. Of course it might be a relative path, and it might have . or .. in it, and if so, you will have to start with the dirname(3) and recompite the path as an absolute path before calling getattrlist() to make sure it fits in PATH_MAX characters. Of course going that route you could need to write a lot of code to handle complicated paths, like subtracting a path component when you see ../, or simply dropping ".". realpath(3)? Seems easier than reinventing the wheel but harder than just using getmntinfo(3). I have a couple of philosophical problems with realpath(3), starting with some of the unnecessary work that it does for the immediate problem here, and the folding of multiple disjoint failures into a single set of error codes so that you can't tell where the failure actually happened. It would be better if he just went by mountpoint, in any case, unless he's really asking questions to get to the same question that Vishal Chauhan just asked, in which event he's looking in the wrong place to get complete information. This email sent to site_archiver(a)lists.apple.com

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Re: Getting list and information of Volumes (mounted and unmounted)
by Terry Lambert 23 Apr '09

23 Apr '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dear All, Documentation available at <http://developer.apple.com>. -- Terry _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… On Apr 23, 2009, at 4:28 AM, vishal chauhan wrote: I am making a program which can get the list of volume in the system. I can get volumes which are mounted on the system and their information such as (Volume Name. Block size, free block , total block, file system etc..). But how can I get the volume information of unmounted volumes that is I want to get the list of all the volumes whether it is (mounted or unmounted). Any help would be appreciable. Typically you would open the IO Device Registry and ask it for the device information. This email sent to site_archiver(a)lists.apple.com

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Re: help needed with getmntinfo()
by Steve Checkoway 23 Apr '09

23 Apr '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Apr 23, 2009, at 4:18 AM, Terry Lambert wrote: -- Steve Checkoway "Anyone who says that the solution is to educate the users hasn't ever met an actual user." -- Bruce Schneier _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com If you absolutely have to go though /Volumes for some bizarre and unexplainable reason, then you will need to lstat the path, see that it's a symbolic link, and use readlink(2) to read the link target, then use the link target as the path instead, internally. Of course it might be a relative path, and it might have . or .. in it, and if so, you will have to start with the dirname(3) and recompite the path as an absolute path before calling getattrlist() to make sure it fits in PATH_MAX characters. Of course going that route you could need to write a lot of code to handle complicated paths, like subtracting a path component when you see ../, or simply dropping ".". realpath(3)? Seems easier than reinventing the wheel but harder than just using getmntinfo(3). smime.p7s

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Getting list and information of Volumes (mounted and unmounted)
by vishal chauhan 23 Apr '09

23 Apr '09

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Re: help needed with getmntinfo()
by Terry Lambert 23 Apr '09

23 Apr '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi, Thanks for the help. Now if the program is called like this : #checkvol /Volumes/part2 where /Volumes/part2 is the volume to be queried. Here /Volumes/part2 is not identified and hence gives no output. Or you could just call getmntinfo() to get a full list of mount points. -- Terry _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… On Apr 23, 2009, at 2:32 AM, rohan a <info1686(a)gmail.com> wrote: However, I am writing code to display file-system attributes using the getattrlist() call. What can I do here? Don't call it on /Volumes/part2. The getattrlist you are calling will return information for the symbolic link itself, not the link target. Since getmntinfo() will never return "/Volumes/part2" anyway, given your example, I guess I don't understand where you are getting your knowledge of that name in the first place so that you can give the bogus argument to your program instad of the correct argument, /. It would be like calling it on /tmp (also a symlink and not a mount point) or on /etc/ttys (a plain file, not a mount point). If you are iterating /Volumes, I guess I need to point out again that not all file systems hat mounted there, so it's not a useful way to make sure you've seem all of them (for that, we have getmntinfo). I will also point out, since your program is named "checkvol" that if that's a file system consistency checker that any file system mounted other than read only will pretty much always show as inconsistent. That's why we do fsck on / with it mounted read-only, and also why we fsck other filesystem before we mount them. If you absolutely have to go though /Volumes for some bizarre and unexplainable reason, then you will need to lstat the path, see that it's a symbolic link, and use readlink(2) to read the link target, then use the link target as the path instead, internally. Of course it might be a relative path, and it might have . or .. in it, and if so, you will have to start with the dirname(3) and recompite the path as an absolute path before calling getattrlist() to make sure it fits in PATH_MAX characters. Of course going that route you could need to write a lot of code to handle complicated paths, like subtracting a path component when you see ../, or simply dropping ".". This email sent to site_archiver(a)lists.apple.com

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Re: help needed with getmntinfo()
by rohan a 23 Apr '09

23 Apr '09

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Re: help needed with getmntinfo()
by Terry Lambert 23 Apr '09

23 Apr '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hello all, I have a file-system mounted on /. But there is symbolic link to it at /Volumes/part2 ls -l /Volumes/ total 8 drwxrwxr-x 7 root admin 340 Feb 15 2008 * lrwxr-xr-x 1 root admin 1 Apr 13 12:55 part2 -> / drwxrwxr-t 39 root admin 1428 Feb 24 14:44 part3 Because it's not a mount point. -- Terry _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… On Apr 23, 2009, at 1:51 AM, rohan a wrote: Now when I run a getmtinfo() call it does not show me the /Volumes/ part2 Why is this? it's a symbolic link put there each time the system boots for the convenience of things like the Dock, which like to find files in the same place each time. So, for example, if you had a machine with multiple partitions, with say Tiger installed on one of them and Leopard on another, there will be a link in /Volumes that will point to the currently booted systems / partition. It won't matter which one you boot, /Volumes/Tiger/Applications/SomeProgramName will always resolve to the program on the Tiger partition, and /Volumes/Leopard/ Applications/SomeOtherProgram will always resolve to the program on the Leopard partition. I need this because I would be passing the mount-point name as argument to the getattrlist() call. Does getmntinfo() allow some flag to be set to do this? You don't need to know anything about /Volumes. If /Volumes is meaningful at all, getmntinfo() will tell you. Per the man page, getmntinfo() will return the mount point names for all the mount points. /Volumes is irrelevant except as a well known saved path for things which save away path names. For the currently mounted root partition, getmntinfo() will return "/" ...which is what it's supposed to return. This email sent to site_archiver(a)lists.apple.com

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help needed with getmntinfo()
by rohan a 23 Apr '09

23 Apr '09

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Re: Determining file-system ACL support
by Terry Lambert 23 Apr '09

23 Apr '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com It works for any volume. That's the point of volume attributes. -- Terry _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… On Apr 23, 2009, at 1:28 AM, rohan a wrote: Hello, I need to determine if ACL's are supported on a particular volume on a Mac OS X box. I can use the getattrlist() call with ATTR_VOL_CAPABILITIES and VOL_CAP_INT_EXTENDED_SECURITY to determine ACL support. However, will this work on a UFS volume also or only on the HFS+ volume ? If not, then how will I determine if the UFS volume supports ACL's or not? This email sent to site_archiver(a)lists.apple.com

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