June 2004 - Darwin-kernel - lists.apple.com

Ignore: Re: AppleSamplePCI example
by Krishna Monian 25 Jun '04

25 Jun '04

Never mind. Ignore the previous message. --- Krishna Monian <k_tutorials(a)yahoo.com> wrote: > Could anyone send me the link to the AppleSamplePCI > example. I am not able to find it anywhere. > > Thanks > > > > __________________________________ > Do you Yahoo!? > New and Improved Yahoo! Mail - Send 10MB messages! > http://promotions.yahoo.com/new_mail > __________________________________ Do you Yahoo!? New and Improved Yahoo! Mail - 100MB free storage! http://promotions.yahoo.com/new_mail _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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AppleSamplePCI example
by Krishna Monian 25 Jun '04

25 Jun '04

Could anyone send me the link to the AppleSamplePCI example. I am not able to find it anywhere. Thanks __________________________________ Do you Yahoo!? New and Improved Yahoo! Mail - Send 10MB messages! http://promotions.yahoo.com/new_mail _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: boundary crossing latencies
by Andrew Gallatin 25 Jun '04

25 Jun '04

Andrew Gallatin writes: > > Platform null (us/call) ioctl(us/call) user client(us/call) > -------- ----------- -------- ------------------- > G5/linux2.6.5 0.2112 0.6679 N/A > G5/OSX 10.3.3 1.4568 2.5152 4.7201 In single user-mode (nvram 'boot-args= -s'), the null syscall latency remains about the same. The ioctl latency actually does drop a tiny bit to a little more than 2.40us. I forgot the copy the SimleUserClient kext to a local disk, so I did not test that.. I first entered single user mode via kill -TERM init. This led to a doubling of the null and ioctl latencies. Its not important at all, but I'm curious why this was. Some problem caused by mach_init going away? Drew _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Little more about mbufs
by Matt Jaffa 25 Jun '04

25 Jun '04

Wow thanks, That diagram helped a bunch, over looked it. Now My program finds all the data necessary. Matt On Jun 24, 2004, at 10:43 AM, Peter Lovell wrote: On Jun 24, 2004, at 11:04 AM, Matthew Jaffa wrote: Hi, I have read chapter 2 about mbufs in TCP/IP books by Stevens. I am trying to get a little more understanding. My NKE is intercepting POST and GET Requests, normally these are within the range of 200 - 1500 in size so that it is easy to get all of the information from the mbuf by just doing char * data = mtod(mbuf,char*); But I now am dealing with POSTS that are huge, when I submit a huge POST form data is big. The first POST Request I intercept however is of the size > 2051, but when I look at outgoing traffic using ethereal each one is made sure to be split into chunks less than 2051, so how come the mbuf's m_pkthdr.len is greater then 2051 when it is only storing 2051, does this mean that there is another mbuf chained to it that I must then get the remaining data for that POST that has m_pkthdr.len > 2051? Thanks, Matt There's a big difference between m_pkthdr.len and m_len. Have a close look at the diagram on page 35 and it should help explain where the various bits of the packet are located. Regards.....Peter _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored. _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Re-routing System Calls
by Marek Kozubal 25 Jun '04

25 Jun '04

On Thu, 24 Jun 2004, Krishna Monian wrote: Hi All I am in the process of rerouting system calls to my own versions. Most of the calls are related to the file system. Could someone tell me where I could get the signatures for all the functions for which there is a define in the syscall.h header. Bad idea, don't go there, stop right were you are! There was a thread on this previously, look in the archives. I would believe apple would suggest a layered file system before they suggested doing anything with the syscall table. Thats even more likely to break than the layered file systems at the moment. The Apple folks nearly had a heart attack when someone was doing this with exit(). --- Marek Kozubal marek(a)portents.com _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Monitoring File Access (Read / Write)
by Marek Kozubal 25 Jun '04

25 Jun '04

I started writing this a few days ago, and then put it aside, since Krishna has discovered stackable file systems, I'm going to post this anyways. On Thu, 17 Jun 2004, Krishna Monian wrote: What would be the best way to go about doing this? Is a kernel hook the only way? Is there anything that has already been done along these lines (quite sure it has)? Quinn will probably cringe at me suggesting this... But if this is not for wide spread deployment, what you can do is take the source for nullfs and create a new file system that will send messages to a user land program noting when whatever file system accesses you want to find. Instead of using nullfs to mirror the file system from one spot to another, you mearly use it to cover up the part of the file system you wish to monitor. Since you're in an "unfinished" part of the kernel, you will have to figure out how to do communiation to your user land daemon. Socket's are what Apple has suggested in the past to use (see WebDAVfs source for examples). You can probably pass whatever information you need to the file system via parameters in your custom args structure when calling mount(). Now, Apple does not endorse or support the idea of using layered file systems. This could stop functioning at any time, etc etc. And if you can find another solution that will work for you, you should use it. See QA: http://developer.apple.com/qa/qa2001/qa1242.html I've persoanlly written the only production layered file systems I'm aware of. And we're playing to move away from them as time moves on. When we started this, the Apple line was "we won't support it" instead of "we'd really prefer that you don't do it if you can at all avoid it". --- Marek Kozubal marek(a)portents.com _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: file sync on close(2)
by Jim Magee 24 Jun '04

24 Jun '04

Sorry for the long delay. I've been a bit busy... ;-) On Jun 14, 2004, at 2:31 PM, Justin Walker wrote: > On Jun 14, 2004, at 11:01, Jay A. Kreibich wrote: >> The "single user mode" you get on boot, and the "single user mode" >> you get via a SIGTERM to init(1) are two different things. > > Not really. Actually, and unfortunately, Jay is correct. Going back down to single-user-mode is something that Darwin does not do very gracefully [or correctly] at the moment. And, as Jay stated, that "second" single-user-mode is quite a bit less functional than the first. Mainly, this is because mach_init disappears. And with it goes lots of mechanism that is expected to be available by the processes one expects to work with in single-user mode. Init also thinks "the old mach_init is still the current one." So, as it launches processes on the way back up - they all will try to talk to the dead mach_init - quite unsuccessfully as you would imagine. But there are also lots of other things that weren't as graceful as they should be. One example is that the dynamic_pager process, which manages the swap file creation/deletion for the kernel, goes away. Any new one that comes up after a trip into single-user mode and back won't know anything about the swap files that were created by the first one. The current protocol between the kernel and this daemon doesn't help in that regard - so confusion reigns there as well. There are a handful of other similar issues. The result is that going back to single-user-mode without the reboot is not a very safe or pleasant thing to do at the moment. Luckily, the reboot really doesn't add much time to the process - so most people don't care about all this. But if you are trying to "add cleanup" at that stage before the reboot, it becomes all too apparent. Mac OS X doesn't support the notion of single-user-mode on the way down, so this isn't a problem there. But people using Darwin in ways Mac OS X doesn't have noticed these and filed the appropriate bug reports already. And before the questions come, yes we are addressing these issues as best we can. But until we nail them all satisfactorily, we don't want to "fix" the mach_init thing. It will make too many things "appear" to work - when they system is none the happier overall. --Jim [demime 0.98b removed an attachment of type application/pkcs7-signature which had a name of smime.p7s] _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: system.log file deleted
by Brian Bergstrand 24 Jun '04

24 Jun '04

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Wrong list, but this should do the trick: $ ps ax | grep syslogd 87 ?? Ss 0:08.33 /usr/sbin/syslogd -s -m 0 $ sudo touch /var/log/system.log; sudo kill -HUP 87 HTH. On Jun 24, 2004, at 3:57 PM, Krishna Monian wrote: > Hi, > > I deleted the /var/log/system.log by mistake. And now > nothing seems to be getting logged into the file. > > Could someone tell me how I should fix this? > > Thanks > > Brian Bergstrand <http://www.bergstrand.org/brian/>, AIM: triryche206 PGP Key: <http://www.bergstrand.org/brian/misc/public_key.txt> Tact is the ability to describe others as they see themselves. - Abraham Lincoln As of 04:16:35 PM, iTunes is playing "Operation: Mindcrime" from "Operation Livecrime" by "QueensrC?che" -----BEGIN PGP SIGNATURE----- Version: PGP 8.1 iQA/AwUBQNs3BXnR2Fu2x7aiEQK4AQCfcLcQu6o25kLc2LYlrcOJEobCZpQAnRyo EeSRrKObwQXK/VZHaWsjECpw =HmTP -----END PGP SIGNATURE----- _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: system.log file deleted
by Robert Minsk 24 Jun '04

24 Jun '04

>From the daily crontab if [ -f /var/run/syslog.pid ]; then kill -HUP $(cat /var/run/syslog.pid | head -1); fi or just do killall -HUP syslogd On Jun 24, 2004, at 1:57 PM, Krishna Monian wrote: Hi, I deleted the /var/log/system.log by mistake. And now nothing seems to be getting logged into the file. Could someone tell me how I should fix this? Thanks __________________________________ Do you Yahoo!? Take Yahoo! Mail with you! Get it on your mobile phone. http://mobile.yahoo.com/maildemo _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored. !DSPAM:40db410088061869151690! _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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system.log file deleted
by Krishna Monian 24 Jun '04

24 Jun '04

Hi, I deleted the /var/log/system.log by mistake. And now nothing seems to be getting logged into the file. Could someone tell me how I should fix this? Thanks __________________________________ Do you Yahoo!? Take Yahoo! Mail with you! Get it on your mobile phone. http://mobile.yahoo.com/maildemo _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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