site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com --- At Tue, 11 Mar 2008 20:00:10 +0530, Nick Rogers wrote:

Hi, I'm using "BetterAuthorizationSample" from apple, which installs a privileged helper tool for performing privileged operations. While using this I can obtain a valid file descriptor for reading any disk, I can not get a valid file descriptor for writing to disk (/dev/ rdisk1, which is a pen drive). I'm using: fileDesc = open(path, O_RDWR); in the privileged part (helper tool) of my code.

Any help would be greatly appreciated.

O_RDWR will work if the disk is unmounted. While the disk is mounted, of course the OS has the rdisk open. In order to write to the disk you have to use O_SHLOCK. fileDesc = open(path, O_RDWR | O_SHLOCK ); ...Duane _______________________________________________ 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... This email sent to site_archiver@lists.apple.com