site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Regards, Bijoy Thomas. On May 9, 2005, at 10:23 AM, Quinn wrote: This email sent to bijoyjth@bluebottle.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... I was just curious about how they worked on the ppc. By system call patching, do you mean that the syscall table is no longer exported and replacing system calls with your own functions or trying to add a new syscall is no longer possible? I remember the Linux kernel developers got tired of people hijacking syscalls and decided not to export it any more with version 2.6. But ofcourse, people have found ways around it. At 22:11 -0400 2/5/05, Bijoy Thomas wrote: Thanks for the reply. I just came across an article on it. http://dom.neopoleon.com/permalink.aspx/4e48d9dd-4c28-4b89-a8e5 -8cb158da44c3 Learning how system calls work is all well and good for curiosity's sake, but I have a couple of warnings about using this information in a product. o Apple does not support binary compatibility for statically linked executables. That is, if you do as the above article suggests and write your own glue to make system calls from a user space program, we won't make any effort not to break you. For binary compatibility, you must make system calls by dynamically linking to libSystem. o Monkeying with the in-kernel system call dispatch mechanism is definitely not supported. Many folks have discovered this as they've trying to port their code to Tiger. System call patching is not supported on Tiger. If you can explain what you're trying to achieve, we might be able to suggest a better alternative. S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Technical Support * Networking, Communications, Hardware _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/ bijoyjth%40bluebottle.com This email sent to site_archiver@lists.apple.com