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

Re: Determining extended attribute support on a volume
by Terry Lambert 25 Apr '09

25 Apr '09

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x87 status word size
by Jonas Maebe 25 Apr '09

25 Apr '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hello, Thanks, Jonas _______________________________________________ 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… Why is the x87 tag word field (__fpu_ftw) in _STRUCT_X86_FLOAT_STATE32 in osfmk/mach/i386/_structs.h only 8 bits? The hardware tag word is 16 bit. I guess it "overflows" into the next "__fpu_rsrv1" field when saving/restoring the fpu state, so in practice it probably doesn't really matter as long as you don't directly access it. This email sent to site_archiver(a)lists.apple.com

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Re: Determining extended attribute support on a volume
by rohan a 25 Apr '09

25 Apr '09

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Re: Determining extended attribute support on a volume
by Terry Lambert 25 Apr '09

25 Apr '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Note that this only refers to native wupport. So worst case, you have an ACL in an extended attribute in a poop file. -- 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 24, 2009, at 11:38 PM, rohan a wrote: Hello, How can I determine if a volume supports extended attributes before I can actually call the functions getxattr() or setxattr()? Read 12 lines further in the manual page for getattrlist(), until you get to two capabilities past the VOL_CAP_INT_EXTENDED_SECURITY to the VOL_CAP_INT_EXTENDED_ATTR entry. Basically, if a volume doesn't support ACLs natively, then ACLs are stored in a filesect in an extended attribute. If it doesn't support extended attributes natively, then extended attributes are stored in poop files. There are also mount options that control whether or not the volume is going to support ACLs; by default, if it sees that the ACL attribute was turned on previously, it will turn it on when the volume is mounted, unless you remount it or ask it not to for a given mount instance, in which case it will turn them off. This email sent to site_archiver(a)lists.apple.com

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Re: ACL Types supported in Mac OS X
by Terry Lambert 25 Apr '09

25 Apr '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com -- Terry Hi, Or acl_access1 = acl_get_fd_np(fs, ACL_TYPE_ACCESS) ; acl_access2 = acl_get_fd_np(fs, ACL_TYPE_DEFAULT ) ; acl_access3 = acl_get_fd_np(fs, ACL_TYPE_EXTENDED) ; Regards Gangadhr -----Original Message----- From: James Peach [mailto:jorgar@gmail.com] Sent: Wednesday, April 22, 2009 9:02 PM To: Singh, Gangadhar S (BIO) Cc: darwin-dev(a)lists.apple.com Subject: Re: ACL Types supported in Mac OS X Hi , Could anybody clarify what acl type are supported? ACL_TYPE_EXTENDED is supported -- James Peach | jorgar(a)gmail.com _______________________________________________ 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/tlambert%40apple.com _______________________________________________ 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… They are enumerated types, not bits, so you cannot use them in combination. And as you have already been told in this thread, the only type that's supported is ACL_TYPE_EXTENDED. If you look at our published source code for Libc, you will see that calling the function acl_get_fd_np() with anthing other than plain vanilla ACL_TYPE_EXTENDED will get you an error of EINVAL. You'll also see that these type only exist in Libc's imagination, and that the kernel implementation doesn't know that other types could even exist, since it's not a parameter to filesec_get_property. On Apr 24, 2009, at 4:32 AM, Singh, Gangadhar S (BIO) wrote: Can we use acl_get_fd_np() to receive all different acls in one go or it should be received one by one. Example: acl_access = acl_get_fd_np(fs, ACL_TYPE_ACCESS| ACL_TYPE_DEFAULT | ACL_TYPE_EXTENDED) ; 2009/4/22 Singh, Gangadhar S (BIO) <gangadhar.singh(a)hp.com>: According to man pages of acl_get_fd_np(), it says that it's possible to retrieval any type of ACL from a file descriptor. But in the /usr/sys/acl.h, I see most of the ACL types are commented as not supported, bit confuse here. /* 23.2.6 Individual ACL types */ typedef enum { ACL_TYPE_EXTENDED = 0x00000100, /* Posix 1003.1e types - not supported */ ACL_TYPE_ACCESS = 0x00000000, ACL_TYPE_DEFAULT = 0x00000001, /* The following types are defined on FreeBSD/Linux - not supported */ ACL_TYPE_AFS = 0x00000002, ACL_TYPE_CODA = 0x00000003, ACL_TYPE_NTFS = 0x00000004, ACL_TYPE_NWFS = 0x00000005 } acl_type_t; This email sent to tlambert(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Determining extended attribute support on a volume
by rohan a 25 Apr '09

25 Apr '09

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Re: Backup/Restore of Alias files
by Gregory Weston 25 Apr '09

25 Apr '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com rohan a wrote: Hello, I am writing a backup/restore utility on Mac OS X and faced some issues with Alias files. Alias files resolve their targets using the target pathname and then its unique File ID. Sort of. Aliases can store either or both. The default one they use - if both are present - depends on the OS version, and can be overridden by any individual developer. Oh, and they can be relative to some other file. Consider I have an alias file named *alias* pointing to *user.txt*. If I backup and restore both *alias* and *user.txt*, then *alias* will no longer point to *user.txt*(If I restore it to some other location) as the file ID of *user.txt* will have changed after the restore(because I am creating a new file). True. It is, as far as the OS is concerned, a completely different file. The fact that the content and leaf node name happen to match something else is not meaningful (or even known). Even if I restore it to the same location, it will point to the right file only till user.txt is moved to some other location. Not quite correct. If you restore it to the correct location and then the alias is resolved, the resolution routine will note that the alias record was stale and has been updated. Any sane software (and I think Finder counts in this specific instance) will then re-save the alias record back to the alias file. Here, the alias files will start pointing to arbitrary files which will be a complete mess. Does Mac OS X provide any API's to deal with Alias files. An alias file is a file with an empty data fork and a resource fork that contains an alias record (resource type 'alis' with ID 0) and custom icons pulled from the target. The type and creator are set to that of the target file, and there's a metadata flag that says it's an alias. If the target is an app, the type code should be 'adrp' instead of 'APPL.' Officially there is no direct means to create them; you do so by sending AppleEvents to Finder. I looked up the Alias manager reference which says that it can only create "alias records" and not "alias files" How do I deal with this problem? Creatively. There really is no supported way to achieve what you want. Probably the one that sucks least is to not actually back up aliases as normal file system objects. Instead build your own record that indicates which item in your backup set they reference. If you end up restoring both, you can restore the target first and then "restore" the alias by constructing a new one based on the above information. _______________________________________________ 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

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

24 Apr '09

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RE: ACL Types supported in Mac OS X
by Singh, Gangadhar S (BIO) 24 Apr '09

24 Apr '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thread-index: AcnDX2pqhXZf9fPARMylXsgkCllM7wBbKTOw Thread-topic: ACL Types supported in Mac OS X Hi, Can we use acl_get_fd_np() to receive all different acls in one go or it should be received one by one. Example: acl_access = acl_get_fd_np(fs, ACL_TYPE_ACCESS| ACL_TYPE_DEFAULT | ACL_TYPE_EXTENDED) ; Or acl_access1 = acl_get_fd_np(fs, ACL_TYPE_ACCESS) ; acl_access2 = acl_get_fd_np(fs, ACL_TYPE_DEFAULT ) ; acl_access3 = acl_get_fd_np(fs, ACL_TYPE_EXTENDED) ; Regards Gangadhr -----Original Message----- From: James Peach [mailto:jorgar@gmail.com] Sent: Wednesday, April 22, 2009 9:02 PM To: Singh, Gangadhar S (BIO) Cc: darwin-dev(a)lists.apple.com Subject: Re: ACL Types supported in Mac OS X 2009/4/22 Singh, Gangadhar S (BIO) <gangadhar.singh(a)hp.com>: > Hi , > > According to man pages of acl_get_fd_np(), it says that it's possible > to retrieval any type of ACL from a file descriptor. > But in the /usr/sys/acl.h, I see most of the ACL types are commented > as not supported, bit confuse here. > > Could anybody clarify what acl type are supported? > > /* 23.2.6 Individual ACL types */ > typedef enum { > ACL_TYPE_EXTENDED = 0x00000100, > /* Posix 1003.1e types - not supported */ > ACL_TYPE_ACCESS = 0x00000000, > ACL_TYPE_DEFAULT = 0x00000001, > /* The following types are defined on FreeBSD/Linux - not supported */ > ACL_TYPE_AFS = 0x00000002, > ACL_TYPE_CODA = 0x00000003, > ACL_TYPE_NTFS = 0x00000004, > ACL_TYPE_NWFS = 0x00000005 } acl_type_t; ACL_TYPE_EXTENDED is supported -- James Peach | jorgar(a)gmail.com _______________________________________________ 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

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Backup/Restore of Alias files
by rohan a 24 Apr '09

24 Apr '09

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