August 2013 - Darwin-dev - lists.apple.com

Re: IOMedia Child instance and diskutil...
by Kumar Gaurav 27 Aug '13

27 Aug '13

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Actual memory cost of a pid
by Erwin Namal 27 Aug '13

27 Aug '13

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IOMedia Child instance and diskutil...
by Kumar Gaurav 26 Aug '13

26 Aug '13

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Re: Accessing <quarantine.h> and working with file quarantine data
by Jean-Daniel Dupas 16 Aug '13

16 Aug '13

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Accessing <quarantine.h> and working with file quarantine data
by Dragan Milić 16 Aug '13

16 Aug '13

Hello, I'd like to know if it is possible to somehow include <quarantine.h> into my own source files. That header seems to be private and it declares a family of qtn_XXX_XXX() functions I'd like to access. Is that possible? What I actually want to do is to compile a modified version of the "copyfile.c" file I downloaded from Darwin sources. I'm working on an application which has to be able to copy files and I use copyfile() API for that, but due some issues I want to use modified version of this source file. The file includes <quarantine.h> header which is not accessible to regular development environment. I tried to link against all libraries which looked like sensible candidates (like libquarantine.dylib), but it didn't help. I can do the trick and change #ifdef macro to actually avoid this header file and also declare quarantine functions not to do anything (like the original source does for TARGET_OS_EMBEDDED) but that way I lose possibility to preserve quarantine data; if I copy a file which has some quarantine data attached, those are discarded from the destination file. If there is some other way to handle file quarantine data (preferably still in the POSIX/BSD layer), I'd like to hear about. I'd like to avoid typing a long story here, but if anyone's interested in why I need modified version of "copyfile.c", I can post it here. There's one bug and some performance issues (which I'd also like to discuss, perhaps here, so if anyone's interested…). Thanks, -- Dragan _______________________________________________ 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: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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Re: Determine if a file system supports files > 4GB
by Dragan Milić 12 Aug '13

12 Aug '13

On pon 12.08.2013., at 17.27, Dragan Milić wrote: > On pon 12.08.2013., at 16.36, Jean-Daniel Dupas wrote: > >> … CFURL also provide a kCFURLVolumeMaximumFileSizeKey which look suited to your need. > > Yes, true. And now I feel somewhat stupid missing that one even though I looked into CFURL documentation. I was actually looking into NSURL and CFURL from OS X 10.6 documentation :-( kCFURLVolumeMaximumFileSizeKey (Core Foundation) and even NSURLVolumeMaximumFileSizeKey (Foundation) are available as of 10.7. I'll probably remove 10.6 docs to avoid similar gaffes in the future. Thanks again. -- Dragan _______________________________________________ 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: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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Re: Determine if a file system supports files > 4GB
by Dragan Milić 12 Aug '13

12 Aug '13

On pon 12.08.2013., at 16.36, Jean-Daniel Dupas wrote: > That said, if you don't want to drop down to the POSIX API, CFURL also provide… Not, that's exactly what I want! The rest of the code I'm working on is almost completely written in C, so POSIX API is preferable over CF. > You are looking for getattrlist() > > Search for VOL_CAP_FMT_2TB_FILESIZE in the man page ("If this bit is set the volume format supports file sizes larger than 4GB"). Thanks a lot for this! My knowledge of availability of different POSIX API functions is still fairly limited. > … CFURL also provide a kCFURLVolumeMaximumFileSizeKey which look suited to your need. Yes, true. And now I feel somewhat stupid missing that one even though I looked into CFURL documentation. -- Dragan _______________________________________________ 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: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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Re: Determine if a file system supports files > 4GB
by Jean-Daniel Dupas 12 Aug '13

12 Aug '13

Le 12 août 2013 à 16:32, Jean-Daniel Dupas <devlists(a)shadowlab.org> a écrit : > > Le 12 août 2013 à 15:34, Dragan Milić <milke(a)mac.com> a écrit : > >> I'm trying to determine if a file system supports "big" files (> 4GB). For that I used to use File Manager API and FSGetVolumeParms() to get extended volume attributes and then check for bSupports2TBFiles. Since the File Manager API has been deprecated as of OS X 10.8, I want to replace all usage of it by other APIs, but I couldn't figure out how to get this particular information. >> >> Documentation suggests to replace FSGetVolumeParms() with -[NSURL getResourceValue:forKey:error:] at the Foundation level or with CFURLCopyResourcePropertyForKey() at the Core Foundation level. However, I couldn't find any key in NSURL/CFURL that would really provide the information I'm looking for. >> >> There are no suggestions what to use at the POSIX level. I checked out statfs(), but it seems it doesn't help either; no particular information about support for "big" files, neither in struct statfs type, nor in its f_flags field. I've found something that suggests solution in "mount.h" header, flag VFS_TBL64BITREADY, but I don't want to go low to kernel level and I still don't know whether "file system 64-bit readiness" really means support for "big" files. > > You are looking for getattrlist() > > Search for VOL_CAP_FMT_2TB_FILESIZE in the man page ("If this bit is set the volume format supports file sizes larger than 4GB"). > That said, if you don't want to drop down to the POSIX API, CFURL also provide a kCFURLVolumeMaximumFileSizeKey which look suited to your need. -- Jean-Daniel _______________________________________________ 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: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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Re: Determine if a file system supports files > 4GB
by Jean-Daniel Dupas 12 Aug '13

12 Aug '13

Le 12 août 2013 à 15:34, Dragan Milić <milke(a)mac.com> a écrit : > I'm trying to determine if a file system supports "big" files (> 4GB). For that I used to use File Manager API and FSGetVolumeParms() to get extended volume attributes and then check for bSupports2TBFiles. Since the File Manager API has been deprecated as of OS X 10.8, I want to replace all usage of it by other APIs, but I couldn't figure out how to get this particular information. > > Documentation suggests to replace FSGetVolumeParms() with -[NSURL getResourceValue:forKey:error:] at the Foundation level or with CFURLCopyResourcePropertyForKey() at the Core Foundation level. However, I couldn't find any key in NSURL/CFURL that would really provide the information I'm looking for. > > There are no suggestions what to use at the POSIX level. I checked out statfs(), but it seems it doesn't help either; no particular information about support for "big" files, neither in struct statfs type, nor in its f_flags field. I've found something that suggests solution in "mount.h" header, flag VFS_TBL64BITREADY, but I don't want to go low to kernel level and I still don't know whether "file system 64-bit readiness" really means support for "big" files. You are looking for getattrlist() Search for VOL_CAP_FMT_2TB_FILESIZE in the man page ("If this bit is set the volume format supports file sizes larger than 4GB"). -- Jean-Daniel _______________________________________________ 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: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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Determine if a file system supports files > 4GB
by Dragan Milić 12 Aug '13

12 Aug '13

I'm trying to determine if a file system supports "big" files (> 4GB). For that I used to use File Manager API and FSGetVolumeParms() to get extended volume attributes and then check for bSupports2TBFiles. Since the File Manager API has been deprecated as of OS X 10.8, I want to replace all usage of it by other APIs, but I couldn't figure out how to get this particular information. Documentation suggests to replace FSGetVolumeParms() with -[NSURL getResourceValue:forKey:error:] at the Foundation level or with CFURLCopyResourcePropertyForKey() at the Core Foundation level. However, I couldn't find any key in NSURL/CFURL that would really provide the information I'm looking for. There are no suggestions what to use at the POSIX level. I checked out statfs(), but it seems it doesn't help either; no particular information about support for "big" files, neither in struct statfs type, nor in its f_flags field. I've found something that suggests solution in "mount.h" header, flag VFS_TBL64BITREADY, but I don't want to go low to kernel level and I still don't know whether "file system 64-bit readiness" really means support for "big" files. I know I can hard-code a list of known file types which support "big" files and use struct statfs fields f_fstypename and/or f_type, but I wouldn't consider that as a reliable approach. -- Dragan _______________________________________________ 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: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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