What are the current kernel resource limits on security-scoped bookmarks?

Question

The docs for -[NSURL startAccessingSecurityScopedResource] state:

You must balance every call to the startAccessingSecurityScopedResource method with a corresponding call to the stopAccessingSecurityScopedResource method. If you fail to relinquish your access when you no longer need a file-system resource, your app leaks kernel resources. If sufficient kernel resources are leaked, your app loses its ability to add file-system locations to its sandbox, such as via Powerbox or security-scoped bookmarks, until relaunched.

Can anybody shed any light on what the limit on kernel resources actual is?

I don't wish to make my app reach these exact limits, just that it would be helpful to know a ballpark figure so I can judge if code is ever doing anything dangerous/stupid.

Answer 1

Ballpark figure is between 1000 and 2500. I read three recent discussions in the Developer Forums at apple. If you are a registered developer at apple you may find it here:

• More than thousand: Limitation of startAccessingSecurityScopedResource NSURLs
• At about 2500: sandbox_consume_fs_extension
• Exact 1000 with QuickLook: Getting sandbox access to many files