site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com Hello, Task special ports are inherited across fork(2). _______________________________________________ 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 On Jan 15, 2009, at 4:13 AM, Jean-Daniel Dupas wrote: I just have a question. On 10.5, the bootstrap_register() doc said this method should not longer be used and give some alternatives like this one: 2) If the code was registering a dynamically generated string and passing the string to other applications, please rewrite the code to send a Mach send-right directly. My question is simple. To send the Mach send right, I need a send right to the target process. But to get a send right from the target process, it need a send right on the first process. That's why the bootstrap server exists. Maybe I miss something, but I do not understand how I can upgrade an app that was using the scenarios describe in 2). Is there some magic way to give a send right to another process ? AFAK, even passing an arbitrary port to a child process is not possible. 0. In parent, create a new port (Port A) to which you hold a receive right. 1. Insert a send right into that port. 2. Cache your current task bootstrap port. 3. Set the task bootstrap port to Port A. 4. fork(2) / exec(2) your child. 5. In the parent, set your task bootstrap port back to the cached port. 6. Have the child send a message to the parent (via its bootstrap port) requesting all the information it needs, perhaps including the parent's bootstrap port. 7. Optionally, have the child reset its bootstrap port to the parent's bootstrap port. Hope this helps. Sometimes I think we need a "general purpose special port" for things like this, but there's nothing particularly evil about using the bootstrap port for this purpose. -- Damien Sorresso BSD Engineering Apple Inc. smime.p7s