March 2012 - Darwin-kernel - lists.apple.com

Re: vmmap
by Stan Sieler 23 Mar '12

23 Mar '12

Re: >>>> Is the source of the Unix tool vmmap available somewhere? >> Also, are you trying to get this information for debugging purposes, or to make some meaningful runtime decision on an app that you ship to real users? > First I want this information for my own entertainment and to educate myself. > Publishing the resulting app for real users might be something to be thought about in the far future. I can sympathize with Gerriet ... I asked similar questions about HP's MPE/iX operating system, and that's what led me to be able to write tools that were eventually products used by users *and* HP. (With the HP 3000, we had a strong users group ... which helped provide much more visibility into the kernel and much more interaction with the kernel lab.) I find memory (real and virtual) to be one of the hardest things to get good information about on operating systems other than the now-discontinued MPE/iX. I like asking questions: is this virtual address valid? Is it readable by me? Writable? Is this virtual page in memory? Is it dirty? Was it referenced recently? Is it frozen in memory? (Let me freeze, and later unfreeze it.) (For that matter, let me say "I'm planning to use it in the next few milliseconds... please fetch it into memory behind my back now, while I do other things"). These are all reasonable questions to ask ... one can easily see how they can lead to better/faster code in some cases. Stan _______________________________________________ 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: https://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: vmmap
by Antoine Missout 23 Mar '12

23 Mar '12

I would disassemble /System/Library/PrivateFrameworks/Symbolication.framework/Versions/A/Symbolication Doing nm /System/Library/PrivateFrameworks/Symbolication.framework/Versions/A/Symbolication yields interesting functions: mach_vm_region_recurse vm_map_page_query And other functions in mach_vm.def in the kernel source might interest you. Good luck! - Antoine On 2012-03-23, at 6:07, Gerriet M. Denkmann wrote: > > On 23 Mar 2012, at 16:58, Quinn The Eskimo! wrote: > >> >> On 23 Mar 2012, at 09:55, Quinn The Eskimo! wrote: >> >>> On 23 Mar 2012, at 09:27, Gerriet M. Denkmann wrote: >>> >>>> Is the source of the Unix tool vmmap available somewhere? >>> >>> It is not. >> >> Also, are you trying to get this information for debugging purposes, or to make some meaningful runtime decision on an app that you ship to real users? The latter is likely to be a mistake, because binary compatibility at this layer is less than perfect. > > First I want this information for my own entertainment and to educate myself. > > Publishing the resulting app for real users might be something to be thought about in the far future. > > > Kind regards, > > Gerriet. > > > _______________________________________________ > 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: > https://lists.apple.com/mailman/options/darwin-kernel/antoine.missout%40met… > > This email sent to antoine.missout(a)metakine.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: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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FYI attach -waitfor, breakpoints and Xcode
by José Cornado 23 Mar '12

23 Mar '12

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Re: vmmap
by Gerriet M. Denkmann 23 Mar '12

23 Mar '12

On 23 Mar 2012, at 16:58, Quinn The Eskimo! wrote: > > On 23 Mar 2012, at 09:55, Quinn The Eskimo! wrote: > >> On 23 Mar 2012, at 09:27, Gerriet M. Denkmann wrote: >> >>> Is the source of the Unix tool vmmap available somewhere? >> >> It is not. > > Also, are you trying to get this information for debugging purposes, or to make some meaningful runtime decision on an app that you ship to real users? The latter is likely to be a mistake, because binary compatibility at this layer is less than perfect. First I want this information for my own entertainment and to educate myself. Publishing the resulting app for real users might be something to be thought about in the far future. Kind regards, Gerriet. _______________________________________________ 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: https://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: vmmap
by Quinn "The Eskimo!" 23 Mar '12

23 Mar '12

On 23 Mar 2012, at 09:55, Quinn The Eskimo! wrote: > On 23 Mar 2012, at 09:27, Gerriet M. Denkmann wrote: > >> Is the source of the Unix tool vmmap available somewhere? > > It is not. Also, are you trying to get this information for debugging purposes, or to make some meaningful runtime decision on an app that you ship to real users? The latter is likely to be a mistake, because binary compatibility at this layer is less than perfect. Share and Enjoy -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Relations, Developer Technical Support, Core OS/Hardware _______________________________________________ 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: https://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: vmmap
by Quinn "The Eskimo!" 23 Mar '12

23 Mar '12

On 23 Mar 2012, at 09:27, Gerriet M. Denkmann wrote: > Is the source of the Unix tool vmmap available somewhere? It is not. Share and Enjoy -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Relations, Developer Technical Support, Core OS/Hardware _______________________________________________ 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: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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vmmap
by Gerriet M. Denkmann 23 Mar '12

23 Mar '12

Is the source of the Unix tool vmmap available somewhere? If Yes: where? If No: given a pid and an address (pointing to the start of a region as returned by vm_region_64) what to do to get answers to the following questions: - is this region mapped? If Yes: to what file? - is this region shared with other pid's ? If Yes: which ones? Kind regards, Gerriet. _______________________________________________ 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: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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waitfor found
by José Cornado 22 Mar '12

22 Mar '12

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-waitfor in Xcode
by José Cornado 22 Mar '12

22 Mar '12

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Re: Kernel IPC
by Kevin Brock 08 Mar '12

08 Mar '12

On Mar 7, 2012, at 10:06 AM, Quinn The Eskimo! wrote: > > On 6 Mar 2012, at 22:13, me wrote: > >> I am looking for some code examples of kext to user space code. > > For BSD level code I generally recommend kernel control sockets, as illustrated by the tcplognke sample code. > > <https://developer.apple.com/library/mac/#samplecode/tcplognke/> I second this recommendation. I've used kernel control sockets for all sorts of things, and they're 1) brain dead simple compared to some alternatives and 2) pretty robust--I haven't had a major bug yet related to any of the kernel control socket functionality. > In my experience it's very hard to get Mach messaging right and, when you get it from from kernel code, you end up rebooting a lot )-: Or worse, your customer finds the corner cases and *they* reboot a lot… 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: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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