January 2005 - Darwin-kernel

Communicating from kernel extension to application?
by Brian Kendall 09 Jan '05

09 Jan '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Organization: Qrrbrbirlbel User-agent: Opera M2/7.54 (MacPPC, build 1840) - Brian _______________________________________________ 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'm wondering what methods exist for having a kernel extension send a message of some kind that can be received by an application in user space. I searched the archives, and apparently circa a couple of years ago someone asked a similar question and was directed to the source of an example kext called TCPLogger in the Darwin source, but it doesn't look like it exists anymore. Is there anywhere I can find that source, or forgetting that, how could one send a message from a kext to an application? This email sent to site_archiver(a)lists.apple.com

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Re: Getting current time
by Sean Peisert 08 Jan '05

08 Jan '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:references; b=KScYbtr84nCe3nuPZx2vTWCz9BNuyDQ4FXutgXcY28ZK+eb/PSdohNdchVHq2s1Zzzo786A6/trghM0Kqn9klYF9OwKTwBEtI6GJCym9cH6H/LU2gSe2YQPshzEJb5hhmnhV6yUlFmgTF+QmIXnOuxi8HGbfedMNEFcl/wjyaeE= On Sat, 8 Jan 2005 00:59:17 -0500, Karl Magdsick <kmagnum(a)gmail.com> wrote: > If you want to get a clock error estimate from within the kernel, what > do you want to use as your reference clock? I have a CDMA clock plugged into a third-party of my XServe, that I have confirmed accuracy on. I also have a number of other stratum 1 NTP clocks that ntpd is peering with. > The NTP error estimate is based on clock skew, which requires two > clocks. It would appear that this would require porting an NTP (or > other protocol to query remote clocks) client into kernel space or > else writing some user-space code to implement/utilize an NTP client > and pass the information to the kernel. Jitter between the CPU clock > and the BIOS clock is not sufficient for this purpose. Ah, so this comes back to really just needing the ntp_adjtime() call to work, because whatever I implement will need to talk to ntpd? Do you have any advice to massaging the kern_ntptime.c and timex.h files from FreeBSD into something that will function properly on Darwin? Thanks, Sean > > > -Karl > > On Fri, 7 Jan 2005 13:26:31 -0800, Sean Peisert <peisert(a)gmail.com> wrote: > > > >> I was wondering if there is a way to get the current time of the day > > > >> it is on the system from > > > >> within a kernel extension I am writing. > > > > > > > > You can follow the code for gettimeofday() and just call > > > > Is there an equivalent to this for getting the error estimate that > > ntp_adjtime() gives? > > > > -- > > Sean Peisert > > http://www.sdsc.edu/~peisert/ > -- Sean Peisert (858) 822-3685 (voice) peisert(a)sdsc.edu (858) 822-5443 (fax) http://www.sdsc.edu/~peisert/ Fellow, San Diego Supercomputer Center University of California, San Diego 9500 Gilman Drive, MC 0505 La Jolla, CA 92093-0505 _______________________________________________ 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: Getting current time
by Karl Magdsick 08 Jan '05

08 Jan '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:references; b=Pd5+BJdtf3Z+Lg5zezPfgIFO/Cbuwq4uyOqh7BDmxJdKYDT1r1DHseVpA4W979DCKHW6Y8bgkAyg99L868D47RlQaWoYaOgtbU1mYgqr4niMdfOKzFxCYLyPQ4qw9X0o2WGgT7Hgrz4TDgJP7t0Y5Aci4uXzgVqQIspmQ65ezh0= If you want to get a clock error estimate from within the kernel, what do you want to use as your reference clock? The NTP error estimate is based on clock skew, which requires two clocks. It would appear that this would require porting an NTP (or other protocol to query remote clocks) client into kernel space or else writing some user-space code to implement/utilize an NTP client and pass the information to the kernel. Jitter between the CPU clock and the BIOS clock is not sufficient for this purpose. -Karl On Fri, 7 Jan 2005 13:26:31 -0800, Sean Peisert <peisert(a)gmail.com> wrote: > > >> I was wondering if there is a way to get the current time of the day > > >> it is on the system from > > >> within a kernel extension I am writing. > > > > > > You can follow the code for gettimeofday() and just call > > Is there an equivalent to this for getting the error estimate that > ntp_adjtime() gives? > > -- > Sean Peisert > http://www.sdsc.edu/~peisert/ _______________________________________________ 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: Getting current time
by Geoffrey Schmit 07 Jan '05

07 Jan '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On 07/01/2005 at 11:45 AM, Matt Jaffa <matt(a)knowligent.com> wrote: > I was wondering if there is a way to get the current time of the > day it is on the system from within a kernel extension I am writing. > I realize that the gettimeofday system call is only available outside > of the kernel? > Any way of doing this? The clock_get_calendar_value function declared in kern/clock.h may do what you want. If I remember correctly, it returns the seconds and nanoseconds since 1970. geoff -- Geoffrey Schmit Senior Software Engineer National Instruments geoffrey.schmit(a)ni.com www.ni.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: Getting current time
by Sean Peisert 07 Jan '05

07 Jan '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:references; b=QyI0PCYpNlSS6Lt5N9GNOLR6unR3MUty4JW3CnmnwcZ0bt4fq9MAhnvZc8Hn/BbPuoFdKMahVui+9ZPsz6O1tmhQIvFAsPX/MStp9JXHIyqarO2JYK6MtcwgzqiO7JhBqM288Ea5wgwPAt8BrSU1JJHG4QhRE2h5mbWC92WRAC0= > >> I was wondering if there is a way to get the current time of the day > >> it is on the system from > >> within a kernel extension I am writing. > > > > You can follow the code for gettimeofday() and just call Is there an equivalent to this for getting the error estimate that ntp_adjtime() gives? -- Sean Peisert http://www.sdsc.edu/~peisert/ Fellow, San Diego Supercomputer Center University of California, San Diego _______________________________________________ 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: Getting current time
by Matt Jaffa 07 Jan '05

07 Jan '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thanks, this works as well. Matt Jaffa On Jan 7, 2005, at 1:36 PM, William Kucharski wrote: On Jan 7, 2005, at 12:45 PM, Matt Jaffa wrote: 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.… I was wondering if there is a way to get the current time of the day it is on the system from within a kernel extension I am writing. You can follow the code for gettimeofday() and just call clock_get_calendar_microtime()... This email sent to site_archiver(a)lists.apple.com

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Re: Getting current time
by William Kucharski 07 Jan '05

07 Jan '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Jan 7, 2005, at 12:45 PM, Matt Jaffa wrote: 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.… I was wondering if there is a way to get the current time of the day it is on the system from within a kernel extension I am writing. You can follow the code for gettimeofday() and just call clock_get_calendar_microtime()... This email sent to site_archiver(a)lists.apple.com

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Getting current time
by Matt Jaffa 07 Jan '05

07 Jan '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi, Thanks, Matt _______________________________________________ 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 was wondering if there is a way to get the current time of the day it is on the system from within a kernel extension I am writing. I realize that the gettimeofday system call is only available outside of the kernel? Any way of doing this? This email sent to site_archiver(a)lists.apple.com

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What is a CACHE_HIT event in fs_usage?
by Richard Jackson 07 Jan '05

07 Jan '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com TIA - Richard _______________________________________________ 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'm using the "fs_usage" utility to help me optimize my application's I/O calls, and I see a lot of events labeled "CACHE_HIT". Could someone explain what these are? (VM paging? File System caching?) Sorry about the novice question, but I can't seem to figure it out from the man page, and most of the Google hits I find describe how to filter these lines out (which is fine, but the anal engineer in me wants to know why... ;-) This email sent to site_archiver(a)lists.apple.com

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iSCSI Initiator
by Plamen Grigorov 07 Jan '05

07 Jan '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Importance: Normal Hi! Have anyone that know where i can found iSCSI Initiator for MacOS? Initiator must support iSCSI protocol version 1.0. _______________________________________________ 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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