October 2006 - Darwin-kernel

Re: BSD Flags further
by Jeffrey Ellis 18 Oct '06

18 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: Acby0Z1u2+KSHV7EEduSwQANk0QgEg== Thread-topic: BSD Flags further User-agent: Microsoft-Entourage/11.2.5.060620 on 10/18/06 4:01 AM, Michael Smith at drivers(a)mu.org wrote: > > On Oct 18, 2006, at 12:26 AM, Jeffrey Ellis wrote: > >> Can someone explain what the actual effect of setting each flag is, >> namely: >> >> arch >> opaque >> nodump > > These three have no significant meaning. I actually read a discussion somewhere, where the user was saying that setting the opaque flag was supposed to help in some instances (sorry, I didn't quite follow what they were trying to do, and I can't find that thread anymore...) The only definition I've found so far is: The opaque flag will prevent a full union stack traversal on later lookups. I have absolutely no idea what this means. > > Each of these three pairs comes in two variants; the 'u' version > which permits the > flag to be set and reset by the owner, or root, at runtime, and the > 's' version which > can be set at runtime, but cannot be cleared except in single-user mode. How can I reboot into single-user mode to clear these files? Thanks again :) All My Best, Jeffrey _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Thread locks in 10.3
by Carl Smith 18 Oct '06

18 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: Acby0OwY/CAzguK5QHasLAp2Sm3YFw== Thread-topic: Thread locks in 10.3 _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: BSD Flags further
by Michael Smith 18 Oct '06

18 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Oct 18, 2006, at 12:26 AM, Jeffrey Ellis wrote: arch opaque nodump These three have no significant meaning. sappnd uappnd schg uchg These are the immutable flags. They make a file, well, immutable. sunlink uunlink And these are the undeletable flags. They make a file undeletable. = Mike _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Can someone explain what the actual effect of setting each flag is, namely: These are the append-only flags. They effectively make it impossible to change data within a file. Each of these three pairs comes in two variants; the 'u' version which permits the flag to be set and reset by the owner, or root, at runtime, and the 's' version which can be set at runtime, but cannot be cleared except in single-user mode. Also, after some are set, I've now found that even sudo'ing "no" commands in chflags will not undo the original flag. -rw-r--r-- 1 jeffrey admin sappnd,arch,opaque 16 17 Oct 22:54 testfile :~/desktop root# chflags nosappnd testfile chflags: testfile: Operation not permitted Is there some other way to un-set these flags? Not short of booting the machine to single-user mode. The s* flags are designed to protect data against someone that has privileged access to the system; allowing that user to turn them off would render them useless. This email sent to site_archiver(a)lists.apple.com

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Re: BSD Flags further
by plumber Idraulico 18 Oct '06

18 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi, I answered you quickly in the previous message if want to learn more about filesystem (and security) 1-there are books (a good way for u) 2- if you want to play with chflag bless CMDs ecetera i recommend u to install a simple x86 freeBSD, OpenBSD ... box (not your personal machine ) you could be surprised :( :) your problem is a lack of basic knowledge but you have the good question I think that you must read documentations on UFS and buy a book Cheers -plum _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: BSD Flags further
by Jeffrey Ellis 18 Oct '06

18 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcbyhrOj8eaB/155EduSwQANk0QgEg== Thread-topic: BSD Flags further User-agent: Microsoft-Entourage/11.2.5.060620 Can someone explain what the actual effect of setting each flag is, namely: arch opaque nodump sappnd schg sunlink uuappnd uchg uunlink I've read the man, but I still don't actually understand what they do. Also, after some are set, I've now found that even sudo'ing "no" commands in chflags will not undo the original flag. -rw-r--r-- 1 jeffrey admin sappnd,arch,opaque 16 17 Oct 22:54 testfile :~/desktop root# chflags nosappnd testfile chflags: testfile: Operation not permitted Is there some other way to un-set these flags? Thanks :) All My Best, Jeffrey on 10/17/06 9:21 PM, jblist(a)mac.com at jblist(a)mac.com wrote: > Won't "chflags()" work? > > > On Oct 17, 2006, at 9:18 PM, Jeffrey Ellis wrote: > >> Can someone tell me the proper way to access the BSD flags for a file? >> >> Thanks :) >> >> All My Best, >> Jeffrey >> >> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) >> Help/Unsubscribe/Update your Subscription: >> http://lists.apple.com/mailman/options/darwin-kernel/jblist%40mac.com >> >> This email sent to jblist(a)mac.com > _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: BSD Flags
by Jeffrey Ellis 18 Oct '06

18 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcbyhYRAwqBkHF54EduSwQANk0QgEg== Thread-topic: BSD Flags User-agent: Microsoft-Entourage/11.2.5.060620 That's used to set the flags, not simply view them. But I did find that ls -lo will work. All My Best, Jeffrey on 10/17/06 9:21 PM, jblist(a)mac.com at jblist(a)mac.com wrote: > Won't "chflags()" work? > > > On Oct 17, 2006, at 9:18 PM, Jeffrey Ellis wrote: > >> Can someone tell me the proper way to access the BSD flags for a file? >> >> Thanks :) >> >> All My Best, >> Jeffrey >> >> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) >> Help/Unsubscribe/Update your Subscription: >> http://lists.apple.com/mailman/options/darwin-kernel/jblist%40mac.com >> >> This email sent to jblist(a)mac.com > _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: BSD Flags
by Paul Ripke 18 Oct '06

18 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Mail-followup-to: darwin-kernel(a)lists.apple.com User-agent: Mutt/1.4.2.1i On Tue, Oct 17, 2006 at 09:18:11PM -0700, Jeffrey Ellis wrote: > Can someone tell me the proper way to access the BSD flags for a file? Programmatically from userland? stat(2) family of calls return the st_flags member. And as per the other reply, chflags(2) (or fchflags(2)) should change them. Cheers, -- Paul Ripke Unix/OpenVMS/TSM/DBA I love deadlines. I like the whooshing sound they make as they fly by. -- Douglas Adams _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: BSD Flags
by jblist＠mac.com 18 Oct '06

18 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Won't "chflags()" work? On Oct 17, 2006, at 9:18 PM, Jeffrey Ellis wrote: Can someone tell me the proper way to access the BSD flags for a file? Thanks :) All My Best, Jeffrey _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/jblist%40mac.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to jblist(a)mac.com This email sent to site_archiver(a)lists.apple.com

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BSD Flags
by Jeffrey Ellis 18 Oct '06

18 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcbybGwPqpzkiV5fEduMlwANk0QgEg== Thread-topic: BSD Flags User-agent: Microsoft-Entourage/11.2.5.060620 Can someone tell me the proper way to access the BSD flags for a file? Thanks :) All My Best, Jeffrey _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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RE: Filesystem bundles
by Michael Welch 17 Oct '06

17 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcbgfNJBsiSiHRZuS2qxlDd38jA4EwRtT7kg Thread-topic: Filesystem bundles Sorry for the late follow up to this (http://lists.apple.com/archives/darwin-kernel/2006/Sep/msg00055.html) I added the suggested call to DiskArbDiskAppearedWithMountpointPing_auto after a mount(2) and it appears in the Finder sidebar as I wanted. It also creates a new issue. Previously the Finder "Eject" button would simply jump back up to the "Computer" view (as described in http://lists.apple.com/archives/darwin-kernel/2005/Dec/msg00056.html) After adding the call to DiskArbDiskAppearedWithMountpointPing_auto, the Finder Eject button hangs the system. I see my file system's vfsop root followed by vfsop getattr requesting f_vol_name (which I do return/set supported) called about a dozen times, and several entries in system.log like the following: ... Oct 17 12:39:25 mwelch diskarbitrationd[41]: iTerm [294]:33027 not responding. Oct 17 12:39:25 mwelch diskarbitrationd[41]: Xcode [226]:32515 not responding. Oct 17 12:39:25 mwelch diskarbitrationd[41]: mdimportserver [203]:22787 not responding. Oct 17 12:39:25 mwelch diskarbitrationd[41]: Finder [201]:18691 not responding. Oct 17 12:39:25 mwelch diskarbitrationd[41]: SystemUIServer [199]:18179 not responding. Oct 17 12:39:25 mwelch diskarbitrationd[41]: SystemUIServer [199]:15159 not responding. Oct 17 12:39:25 mwelch diskarbitrationd[41]: Dock [197]:17155 not responding. ... I looked at the DA framework's DARegisterDisk(Unmount/Eject)ApprovalCallback functions. If those are along the right track then I haven't found the magic formula to make it work. What happens when the Finder Eject button is pressed, and how can I register my filesystem's userspace client to receive notification when that happens so I can unmount? Thanks, - Mike > -----Original Message----- > From: darwin-kernel-bounces+mwelch=adobe.com(a)lists.apple.com > [mailto:darwin-kernel-bounces+mwelch=adobe.com@lists.apple.com ] On Behalf Of Quinn > Sent: Monday, September 25, 2006 1:19 AM > To: darwin-kernel(a)lists.apple.com > Subject: Re: Filesystem bundles > > At 11:57 -0700 22/9/06, Michael Welch wrote: > >I've seen some indication that I need a bundle in > >/System/Library/Filesystems to make this happen - but I can't find > >anything describing what that bundle should contain, and all of the > >pre-existing ones seem different from eachother. > > This is not yet documented. The master bug report covering > the absence of VFS documentation is <rdar://problem/4445951>. > > A file system bundle /is/ the right solution if you're > developing a local file system. DiskArb will consult these > file system bundles as it probes for file systems to mount > any new local disks that appear. > > However, the story is very different for network file systems. > Ideally a network file system should be implemented as a > URLMount framework plug-in. However, this plug-in > architecture is not supported for third party use (and is > apparently pretty broken anyway). This is <rdar://problem/3502170>. > > To make your network file system known to DiskArb, and hence > to other apps on the system, like the Finder, you'll have to > call DiskArb explicitly. Once you've mounted the volume > (using any of the standard techniques, like > <x-man-page://2/mount> or <x-man-page://8/mount>), you can > get it to appear on the desktop by calling the > DiskArbitration routine > DiskArbDiskAppearedWithMountpointPing_auto. Unfortunately, > this routine isn't part of the standard DiskArbitration > framework headers, so you have to declare your own prototype > for it. Here's the prototype below: > > extern kern_return_t DiskArbDiskAppearedWithMountpointPing_auto( > char * disk, > unsigned reserved0032, > char * mountpoint > ); > > where: > > o disk is the device on which the disk is mounted (in the > case of a network volume, you pretty much make this up; > however, it should mount the f_mntfromname returned by statfs) > > o reserved0032 is kDiskArbDiskAppearedNetworkDiskMask (see below) > > o mountpoint is the place where the disk is mounted > > enum > { > kDiskArbDiskAppearedNetworkDiskMask = 1 << 3 > }; > > This routine is part of the old (pre 10.3), private, > DiskArbitration framework API. When we introduced a new, > public DiskArbitration API in Mac OS X 10.3, we didn't > introduce a replacement for this routine because, in the long > term, DiskArbitration will automatically pick up mounts by > way of a kernel notification. So, ultimately, you won't need > to call this routine for your volume to appear on the desktop. > For that reason, I strongly recommend that you weak link > against this symbol and, if it's not present, just don't call it. > > Share and Enjoy > -- > Quinn "The Eskimo!" > <http://www.apple.com/developer/> > Apple Developer Relations, Developer Technical Support, Core > OS/Hardware _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-kernel/mwelch%40 adobe.com > > This email sent to mwelch(a)adobe.com > _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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