site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Aug 29, 2006, at 3:10 PM, Dave Hackenyos wrote: Hello, Thank you for your time, Dave Hackenyos daveh@videx.com Brian Bergstrand <http://www.bergstrand.org/brian/> PGP Key ID: 0xB6C7B6A2 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (Darwin) iD8DBQFE9KlvedHYW7bHtqIRAllHAKCN/kGHplUzd3ZMAUovtcsH8tH7YACfeS4B LnCJGkFqsF4CkAab5OmdNBQ= =iumI -----END PGP SIGNATURE----- _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl... You cannot reliably read data from a device with a mounted FS and attempting to write to one is 99.99999% guaranteed to cause filesystem corruption. There's no way around either of these. Why can't you just use standard files on the filesystem? You can bypass caching on a file level (but not file system level) with fcntl (F_NOCACHE). I am developing a product for the Macintosh platform that requires I read and write files from a mounted device. Information on the mounted device is being updated in real time but I am unable to detect the changes due to the operating system (Darwin?) caching the contents of the device into a buffer which remains static until I unmount the drive with a “diskutil unmount” command. Continually mounting and unmounting the device to see changes in a file is not desirable. Using the IOKit to obtain a handle to the device and then using POSIX funtions to open/read/write does allow access to the raw disk, but I can only access bytes. Reading the entire device and programmatically reproducing the file structure to locate the file I am interested in reading is prohibitive. Changing a file and writing the entire contents of the drive back into it would take 30 seconds or more, also bad. I need a way to read and write to the file system on the mounted device not just access the bytes. Is there a no-cache option on mounting what is effectively a USB storage device? Or how do I bypass the cached buffer? Please let me know if there is a more appropriate forum for asking this question. This message has been scanned by Symantec Mail Security for SMTP. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/brian% 40classicalguitar.net This email sent to brian@classicalguitar.net This email sent to site_archiver@lists.apple.com