May 2005 - Darwin-kernel - lists.apple.com

Re: Problems building xnu-792
by William Kucharski 09 May '05

09 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Monday, May 09, 2005, at 07:29AM, Markus Hitter <mah(a)jump-ing.de> wrote: >But 5 parameters instead of 4? I tried to look up the mapping in Google >as I'm currently resisting to take an in-depth course in PPC assembly >... Sometime between when the Motorola PPC books were published and today, the decision was made to allow a bitmask to be the fourth argument to rlwinm, and to have the assembler automatically calculate the fourth and fifth arguments to rlwinm as documented (mask begin/mask end). This IBM documentation page describes the details: <http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixassem/alangref/r…> William Kucharski kucharsk(a)mac.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: how do I call soreceive?
by Josh Graessley 09 May '05

09 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com What is the value of the non-zero return? -josh On May 9, 2005, at 11:38 AM, Bijoy Thomas wrote: Hi, struct iovec aio; struct uio auio; aio.iov_base = &buf; //buf is a char[100] buf; aio.iov_len = 100; auio.uio_iov = &aio; auio.uio_iovcnt = 1; auio.uio_segflg = UIO_SYSSPACE; //we have a kernel space buffer auio.uio_rw = UIO_READ; auio.uio_offset = 0; auio.uio_resid = 100; auio.uio_procp = current_proc(); Regards, Bijoy Thomas. This email sent to jgraessley(a)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 On Mac OS X 10.4, you will need to call sock_receive or sock_receivembuf instead of soreceive. If you require a kernel extension, you will need to write two versions, one for versions of Mac OS X prior to 10.4 and one for 10.4 and later. I am trying to understaned how to call soreceive from my kext. I am trying to receive data from an ftp server upon connect. My soconnect funtion returns 0 so I am assuming i have a good connect. I am trying to get the welcome message from the ftp server just for confirmation. The soreceive function looks fairly complex and my understanding is that it can do a variety of functions based on its supplied arguments. I just want to receive the welcome message. I do not want to pass it to user space. Upon browsing the kernel sources, I guess this can be accomplished by the following settings, and passing this so soreceive with both the mbufs as NULL. ( I'm guessing the mbufs are provided only if you want the detailed packet header and accompanying data returned possibly as a list of mbufs). I tried it this way but i'm getting a non zero return from soreceive. Any suggestions/links? _______________________________________________ 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/jgraessley% 40apple.com smime.p7s

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Re: how do I call soreceive?
by Justin Walker 09 May '05

09 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On May 9, 2005, at 11:38, Bijoy Thomas wrote: Regards, Justin -- Justin C. Walker, Curmudgeon-at-Large /~\ The ASCII \ / Ribbon Campaign X Help Cure HTML Email / \ _______________________________________________ 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.… [snip] and passing this so soreceive with both the mbufs as NULL. ( I'm guessing the mbufs are provided only if you want the detailed packet header and accompanying data returned possibly as a list of mbufs). I tried it this way but i'm getting a non zero return from soreceive. Any suggestions/links? My first suggestion is to actually look at, and understand, the non-zero return value you get from soreceive(). If you don't understand the value, it might help to let us know what it is. This email sent to site_archiver(a)lists.apple.com

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how do I call soreceive?
by Bijoy Thomas 09 May '05

09 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi, struct iovec aio; struct uio auio; aio.iov_base = &buf; //buf is a char[100] buf; aio.iov_len = 100; auio.uio_iov = &aio; auio.uio_iovcnt = 1; auio.uio_segflg = UIO_SYSSPACE; //we have a kernel space buffer auio.uio_rw = UIO_READ; auio.uio_offset = 0; auio.uio_resid = 100; auio.uio_procp = current_proc(); Regards, Bijoy Thomas. _______________________________________________ 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 am trying to understaned how to call soreceive from my kext. I am trying to receive data from an ftp server upon connect. My soconnect funtion returns 0 so I am assuming i have a good connect. I am trying to get the welcome message from the ftp server just for confirmation. The soreceive function looks fairly complex and my understanding is that it can do a variety of functions based on its supplied arguments. I just want to receive the welcome message. I do not want to pass it to user space. Upon browsing the kernel sources, I guess this can be accomplished by the following settings, and passing this so soreceive with both the mbufs as NULL. ( I'm guessing the mbufs are provided only if you want the detailed packet header and accompanying data returned possibly as a list of mbufs). I tried it this way but i'm getting a non zero return from soreceive. Any suggestions/links? This email sent to site_archiver(a)lists.apple.com

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Re: vnode_getattr
by Quinn 09 May '05

09 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I'm trying to get size of a file from a KEXT under Tiger (Xcode 2.0). I'm using vnode_getattr but when I'm trying to load the driver (kextload -v), it can't find vnode_getattr! What dependencies does your KEXT specify? 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 16:00 -0400 6/5/05, Pezeshgi, Shahriar wrote: This email sent to site_archiver(a)lists.apple.com

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Re: sflt_register in 10.4
by Quinn 09 May '05

09 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com <http://developer.apple.com/contact/> Alternatively, come to WWDC and bug the relevant people in person. 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 21:43 -0400 5/5/05, Peter Lovell wrote: On a related note - this is why it would be great to have GM versions available from the seed site. I've asked for this before and was turned away, but I'll ask again. Understood. However, there's not much that folks who read this list can do to fix this problem. You can try sending your feedback in through the ADC contact page. This email sent to site_archiver(a)lists.apple.com

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Re: Communication between kext
by Quinn 09 May '05

09 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com The IOKitWithLibrary sample shows how to do this. <http://developer.apple.com/samplecode/IOKitWithLibrary/IOKitWithLibrary.html> 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 12:25 +0200 9/5/05, Stephane Sudre wrote: You need to declare a dependency from one kernel extension to the other. This email sent to site_archiver(a)lists.apple.com

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Re: syscall implementation
by Quinn 09 May '05

09 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thanks for the reply. I just came across an article on it. http://dom.neopoleon.com/permalink.aspx/4e48d9dd-4c28-4b89-a8e5-8cb158da44c3 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 22:11 -0400 2/5/05, Bijoy Thomas wrote: 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. This email sent to site_archiver(a)lists.apple.com

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Re: Accessing to a file from a KEXT
by Quinn 09 May '05

09 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Let me try to explain why it's frowned upon... Since you need to rev your driver for Tiger anyway, consider taking a little extra time to do it the right way... 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 13:07 -0700 3/5/05, Mike Smith wrote: As John noted in his followup, this approach is strongly frowned upon. The issue here is one of dependency. Once you're inside the kernel, you should try to avoid taking dependencies on user space code. The problem with opening files from kernel code is that you can't control where the file is coming from (it may require a user space process to service the request, like for WebDAV). The makes the approach inherently dangerous. There are also issues with resource management. The kernel squirrels away certain resources to try to ensure that it can make progress under pathological load conditions. If your kernel code 'leaves' the kernel and then comes back in, you're double dipping from that pool, which can cause the system to run out of these resources, which never ends well. Obviously this is a guideline. In some cases there's no way to avoid this sort of thing. However, be mindful of what Mike wrote: At 13:07 -0700 3/5/05, Mike Smith wrote: The most common reason for why folks want to open a file from within the kernel is that they're writing a driver and they want to download a large firmware image to the device. There are other ways to solve this problem. If that's what you're trying to do, let us know and we'll outline them. This email sent to site_archiver(a)lists.apple.com

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Re: tracing the mount syscall
by Quinn 09 May '05

09 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com 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 18:43 -0400 1/5/05, Bijoy Thomas wrote: Can anyone provide any info on what functions are called and when during a mount? Off the top of my head ('cause I don't have time to look up the exact details), my guess is that your VFS 'mount' and 'root' entry points will be called. It's also likely that you'll get a stat ('getattr') on the root directory. Have you set up two-machine debugging? If so, you can just step through this in source. This email sent to site_archiver(a)lists.apple.com

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