October 2009 - Darwin-kernel

Re: single stepping into signals handlers
by Amanda Walker 16 Oct '09

16 Oct '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Do you mean this is a bug of the kernel of Mac OS X? Do you have some links? --Amanda _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… On Oct 16, 2009, at 4:42 AM, Tristan Gingold wrote: No, he means that the kernel can handle memory >2GB just fine, and that memcpy works. You have a bug in your code. This email sent to site_archiver(a)lists.apple.com

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Re: Compiling xnu-1456.1.26
by Michael Tüxen 05 Oct '09

05 Oct '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Oct 5, 2009, at 4:11 AM, Stacey Son wrote: On Oct 4, 2009, at 10:50 AM, Michael Tüxen wrote: Hi Michael: Shantonu's instructions from his blog worked for me... see http://shantonu.blogspot.com/2009/09/mac-os-x-kernel-source-xnu-has-been.ht… Hi Stacey, Best Regards, -stacey. ---- Stacey Son sson(a)FreeBSD.org _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… is there a documentation how to compile xnu-1456.1.26 and also build the required tools? http://developer.apple.com/mac/library/documentation/Darwin/Conceptual/Kern… /apple_ref/doc/uid/TP30000905-CH221-BEHJDFCA seems outdated. Which gcc version can I use? (Except for the obvious typo on step 6.) thanks for the link! I actually want to build a customized version of Unsupported.kext which exports a couple of extra symbols. Good luck with your SCTP kext (I assume). Yes, thanks! This email sent to site_archiver(a)lists.apple.com

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Re: Compiling xnu-1456.1.26
by Stacey Son 05 Oct '09

05 Oct '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Oct 4, 2009, at 10:50 AM, Michael Tüxen wrote: is there a documentation how to compile xnu-1456.1.26 and also build the required tools? http://developer.apple.com/mac/library/documentation/Darwin/Conceptual/Kern… seems outdated. Which gcc version can I use? Hi Michael: Shantonu's instructions from his blog worked for me... see http://shantonu.blogspot.com/2009/09/mac-os-x-kernel-source-xnu-has-been.ht… (Except for the obvious typo on step 6.) Good luck with your SCTP kext (I assume). Best Regards, -stacey. ---- Stacey Son sson(a)FreeBSD.org _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… I actually want to build a customized version of Unsupported.kext which exports a couple of extra symbols. This email sent to site_archiver(a)lists.apple.com

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Compiling xnu-1456.1.26
by Michael Tüxen 04 Oct '09

04 Oct '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dear all, is there a documentation how to compile xnu-1456.1.26 and also build the required tools? http://developer.apple.com/mac/library/documentation/Darwin/Conceptual/Kern… seems outdated. Which gcc version can I use? Thank you very much for your help. Best regards Michael _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… I actually want to build a customized version of Unsupported.kext which exports a couple of extra symbols. This email sent to site_archiver(a)lists.apple.com

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Re: Are Mach Semaphore Process Shared?
by Abdulla Kamar 02 Oct '09

02 Oct '09

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Re: Are Mach Semaphore Process Shared?
by Terry Lambert 02 Oct '09

02 Oct '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com -- Terry -- Thank you Abdulla _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/tlambert%40apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… You mean write the name to a socket and read the name on the other end of the socket and then open the named semaphore in the other process? Yes. You mean assume that the integer you get back is actually an fd, rather than an implementation detail that could change in the next SU, and that proper reference counting on the semaphore is done when you pass the fd around? No. On Oct 1, 2009, at 7:22 PM, Abdulla Kamar wrote: Mach ports are similar to file descriptors in the sense that the mapping of name to port only exists within one process. I don't know whether it's possible or not, but you may be able to copy the mach port that represents the the semaphore (semaphore_t is a typedef of mach_port_t) to the remote process by sending it as out- of-line data in a mach message. Ah okay, thanks for that. On a related note is it possible to pass a POSIX named semaphore in Mac OS X over a UNIX socket? This email sent to tlambert(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Re: Are Mach Semaphore Process Shared?
by Abdulla Kamar 02 Oct '09

02 Oct '09

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Re: Are Mach Semaphore Process Shared?
by Kevin Van Vechten 01 Oct '09

01 Oct '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Oct 1, 2009, at 2:13 AM, Abdulla Kamar wrote: Kevin _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… I've constructed a couple of mach semaphores in shared memory, which is shared between two processes. One semaphore seems to work, but the other returns "(os/kern) invalid name". Can I actually do this? Is there a way to pass semaphores between processes? Mach ports are similar to file descriptors in the sense that the mapping of name to port only exists within one process. I don't know whether it's possible or not, but you may be able to copy the mach port that represents the the semaphore (semaphore_t is a typedef of mach_port_t) to the remote process by sending it as out-of- line data in a mach message. This email sent to site_archiver(a)lists.apple.com

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Re: Problem Calling namei
by Quinn 01 Oct '09

01 Oct '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com <http://developer.apple.com/mac/library/qa/qa2007/qa1575.html> <http://developer.apple.com/mac/library/documentation/Darwin/Conceptual/KEXT…> S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Relations, Developer Technical Support, Core OS/Hardware At 17:47 +0530 1/10/09, mominabrar wrote: This is interesting. We got back the namei() and family of functions in the new kernel ( <http://www.opensource.apple.com/source/xnu/xnu-1456.1.26/>xnu-1456.1.26 ). You seem to be missing a key point about the Mac OS X kernel architecture, namely that there's a strict separation between how the kernel is implemented and the kernel programming interfaces (KPIs) that we expose to third party developers. In this case, namei is in the kernel, has always been in the kernel, and probably always will be. However, namei is not a KPI. Thus, third party kernel developers are not allowed to link with it [1] because it's not an interface that we plan to support (that is, maintain both source and binary compatibility) in the long term. To reinforce that point, we've been steadily removing non-KPI declarations from our headers. There is a relatively simple way you can check whether a function is a supported KPI. See QA1575 "Supported KPIs" for details. For more background on this stuff, see the "Kernel Extension Dependencies" section of "Kernel Extension Programming Topics". [1] For experimental purposes you can access these routines by linking with the whole kernel. However, that's not something we recommend and, given recent development in the headers, that's becoming increasingly painful; you can make the linker happy relatively easily but assembling a reasonable set of headers to make the compiler happy is tricky. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: Problem Calling namei
by mominabrar 01 Oct '09

01 Oct '09

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