February 2005 - Darwin-kernel

Re: Communicating from kernel extension to application? & Reading data from the Kernel: many to one
by David Gatwood 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Feb 1, 2005, Stephane Sudre <ssudre(a)intego.com> wrote: On Feb 1, 2005, at 7:54 AM, Quinn wrote: At 21:36 -0500 9/1/05, Brian Kendall wrote: I still can't find TCPLogger. Searching the developer site only yields two results to documents mentioning the existence of TCPLogger, but nothing of TCPLogger itself. There must be something I'm missing here in terms of finding it. Where exactly is it? TCPLogger is not currently available publicly. We keep in under wraps because we're actively discouraging the development of BSD-based KEXT because of the binary compatibility concerns. These concerns will be resolved in Tiger, at which point we'll publish TCPLogger properly. If you want a copy of the current code, please write to <dts(a)apple.com> and we'll send it your way. If 10.3 is the minimum requirement, Kern control could be used. There is a sample code for this in the Kernel Programming document AFAIK. Don't ask me the page, I always have to search for it. It's in Network Kernel Extensions, actually. KP pretty much just talks about sysctl, ioctl, and Mach RPC. Message: 15 Date: Tue, 1 Feb 2005 18:40:49 +0100 From: Stephane Sudre <ssudre(a)intego.com> Subject: Reading data from the Kernel: many to one To: darwin-kernel(a)lists.apple.com Message-ID: <6927D782-7478-11D9-A54B-000D932EB96E(a)intego.com> Content-Type: text/plain; charset=US-ASCII; format=flowed What kind of mechanism can be used to read data in the Kernel from a user land application when you need it to work with multiple user land processes? sysctl, ioctl, RPC, kern_control, memory mapping... there's probably at least a couple of dozen. Not that many that are recommended, but.... - sysctl: Add a sysctl record. It works perfectly well but for some reasons I can't use it. Make sure you explicitly set it to be accessible to non-root processes. IIRC, the default is to only be readable by tasks running as root. David _______________________________________________ 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: Reading data from the Kernel: many to one
by Andrew Gallatin 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Stephane Sudre writes: > - sysctl: Add a sysctl record. It works perfectly well but for some > reasons I can't use it. Why can't you use it? > Is there any other simple mechanism (by simple I mean not involving the > I/O Kit for instance)? You can issue an ioctl to a character device. That's pretty simple. But a sysctl would be even more simple.. Drew _______________________________________________ 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: Reading data from the Kernel: many to one
by Godfrey van der Linden 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I'm not sure if I'm comfortable with this designation. Godfrey On Feb 1, , at 9:40, Stephane Sudre wrote: _______________________________________________ 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.… If you are an IOKit driver already have you explored the capablilities of set/getProperties()? Is there any other simple mechanism (by simple I mean not involving the I/O Kit for instance)? This email sent to site_archiver(a)lists.apple.com

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Reading data from the Kernel: many to one
by Stephane Sudre 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com The mechanisms I have experimented so far are: _______________________________________________ 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.… What kind of mechanism can be used to read data in the Kernel from a user land application when you need it to work with multiple user land processes? Let's say I have a long stored in a Kernel Extension and I want to read the value of this long from multiple user land applications (by polling). - Kern Control: Add a Kern Control, and get the value via a getsockopt. It works but this requires to have as much Kern Control sockets registered in the kernel as user land applications that want to access the long. - sysctl: Add a sysctl record. It works perfectly well but for some reasons I can't use it. Is there any other simple mechanism (by simple I mean not involving the I/O Kit for instance)? This email sent to site_archiver(a)lists.apple.com

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Re: How to change ContentHint of a partition
by Dan Markarian 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.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.… This email sent to site_archiver(a)lists.apple.com

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How to change ContentHint of a partition
by Mekhala 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.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.… This email sent to site_archiver(a)lists.apple.com

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Re: Communicating from kernel extension to application?
by Stephane Sudre 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Feb 1, 2005, at 7:54 AM, Quinn wrote: At 21:36 -0500 9/1/05, Brian Kendall wrote: If 10.3 is the minimum requirement, Kern control could be used. _______________________________________________ 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 still can't find TCPLogger. Searching the developer site only yields two results to documents mentioning the existence of TCPLogger, but nothing of TCPLogger itself. There must be something I'm missing here in terms of finding it. Where exactly is it? TCPLogger is not currently available publicly. We keep in under wraps because we're actively discouraging the development of BSD-based KEXT because of the binary compatibility concerns. These concerns will be resolved in Tiger, at which point we'll publish TCPLogger properly. If you want a copy of the current code, please write to <dts(a)apple.com> and we'll send it your way. There is a sample code for this in the Kernel Programming document AFAIK. Don't ask me the page, I always have to search for it. This email sent to site_archiver(a)lists.apple.com

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Re: IOLog on serial port? Or to use kprintf?
by Quinn 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com If you have a second generation G5 (after the 2.5 GHz speed bump), well... the stealth cards reportedly won't fit. 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(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… At 13:45 -0800 24/1/05, David Gatwood wrote: I believe that the serial port in the Xserve will work (although I haven't personally tried it). This email sent to site_archiver(a)lists.apple.com

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Re: NKE Example
by Quinn 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.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.… This email sent to site_archiver(a)lists.apple.com

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Re: 64 bits Kernel and 32 bits process
by Quinn 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com </rant on> [...] This performance cost is the main reason that I'm so disappointed that the kernel will remain 32-bits. [...] <justification> </justification> 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(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… At 13:50 -0500 17/1/05, Andrew Gallatin wrote: </rant off> This is true. But the alternative would be to break existing I/O Kit drivers, which isn't something that would go down well. Mixing 32 bit and 64 bit drivers in the same kernel would be... challenging. This email sent to site_archiver(a)lists.apple.com

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