--- 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
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