March 2011 - Darwin-kernel - lists.apple.com

Re: How to tell if system shutdown is in process
by Jerry Krinock 29 Mar '11

29 Mar '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thank you all for your thoughts on this. I've ensured that my task can be terminated quickly. As most of you have noted, that seems to be the only correct way to do this. Jerry _______________________________________________ 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: task_for_pid reference
by Quinn "The Eskimo!" 28 Mar '11

28 Mar '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On 27 Mar 2011, at 00:34, Rodrigo Vanegas wrote: > I'm reading through source code to learn a bit about OS X kernel programming, and I've come across this bit of code [...] The Mach API is supported, in the sense that DTS will help you use it and that it won't trip any App Store alarms, but it's not very well documented. We try to discourage folks from working with Mach directly because a) it lies very close to the kernel, so it's hard to use without tying yourself to kernel implementation details, b) some parts of it (specifically Mach messaging) are /extremely/ tricky to use correctly, and c) it's not covered by any standard, so, when things go wrong, it's hard to know who's at fault. In general we recommend that folks work at the BSD level (or higher) wherever possible. The best reference documentation for the Mach API as it's implemented on our systems is the documentation that comes with the Darwin kernel source. <http://www.opensource.apple.com/source/xnu/xnu-1456.1.26/osfmk/man/index.ht…> Note: After clicking a link, click the [plain text] button at the top of the page to render the HTML. Or just download the kernel source and open the files with your web browser. As far as conceptual docs, other folks have already recommended "Mac OS X Internals" by Singh, and I wholeheartedly agree with that recommendation. <http://osxbook.com/> It's a little out of date, but nowhere near as out of date as the other standard references, including: o "Programming Under Mach" by Boykin et al, which has been out of print for a while o the OSF docs hosted at CMU <http://www.cs.cmu.edu/afs/cs.cmu.edu/project/mach/public/www/mach.html> <http://www.cs.cmu.edu/afs/cs/project/mach/public/www/doc/osf.html> Finally, I want to reiterate that, while it's fun to play with Mach, it's not the best starting point for most projects. The tricky thing is deciding when it's appropriate to drop down to the level, and I can only advise you on that question if I have more information about your high-level goal (assuming, that is, that you have one :-). S+E -- 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: 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: task_for_pid reference
by der flo 27 Mar '11

27 Mar '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110307 Fedora/3.1.9-0.39.b3pre.fc14 Lightning/1.0b3pre Thunderbird/3.1.9 I think Amit Singh's book would give you good advices, too. --flo _______________________________________________ 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 http://trailofbits.com/2009/08/10/advanced-mac-os-x-rootkits/ you will find some kind of other use of task_for_pid() This email sent to site_archiver(a)lists.apple.com

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Re: task_for_pid reference
by Amanda Walker 27 Mar '11

27 Mar '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Mar 26, 2011, at 8:34 PM, Rodrigo Vanegas wrote: > Is it time to look through texts on OS X internals? Or am I missing something here? Any pointers would be appreciated! If you're interested in Mac OS X kernel programming, Amit Singh's book "Mac OS X Internals: A Systems Approach" is an excellent overview. For device drivers, Apple's IOKit documentation and sample code is very good. --Amanda _______________________________________________ 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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task_for_pid reference
by Rodrigo Vanegas 27 Mar '11

27 Mar '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:from:date:message-id:subject:to :content-type; bh=FcPeoGqIle1iHXZwOEckL2CCC5/z4901uEsNG+eN13A=; b=tCC8H6e7Jlz4b8hrpKMCczy5OB77W8t9A9ABLRNK9gOlAvBbfg/XFjXQDWDd/fRXea 8Uy8RWe9XLFIEqR0I6dHo3KoFQHNbsbNHud1t783AngeZO9J4NZtkBlsDxD8Bu5L8t97 7EJbtnpqgjUsUUwy7PPd+e7P/4s40H5gENdIQ= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:from:date:message-id:subject:to:content-type; b=epoHEZz2i0tcPLEYD6akVbPM+Ho0s9k/BOEelnO4xoYWjLkP/Q+/YHGucJC0cP0Y61 BJcrfmLu+/fQVY76C03us5qIweRGUv2uB3vjd+FU+RE2wMcsV//AqMG41Co7PykSnThb wtWkb5zEZH0CwxH+iYfS7VyjLimi3FqAnr3zU= _______________________________________________ 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 to tell if system shutdown is in process
by James C 25 Mar '11

25 Mar '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=WGpP01wt/VtCQnuF1cwKtxfy8uS8zGmD2E0LF4BruY4=; b=dbrKNhz+obeH+Ep2PKPKvA7UO9Ra+HhDGFxfavVBBMkVYNKjejoERoIO8CbwsC9r59 s1km/0StEVZB7I/KjxDlUEUI34aEn0yxYYRG22V1H+ToH+Z5ppgfmGZIkdjkhuYH8vD+ UBzYb3/N/TJ1q869qJnlN4spgX8fBh/129PKI= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type :content-transfer-encoding; b=suX08hqLkrHjKr8vwkF6yrEz8BW3fiqGM0bZO6rG9a4ni8XiGyNJgu+o71xlOE5zrb s6JRicRktyjAQekL2FHdT/A4AhFxHUAiHZ54w/AIq58tYGrB7X6rax9iAsmLm5MMSnIW GnEpGc7VL1iZfp5+G+tvLffubLaJtfXGiX+8w= I don't know if the output from the long-running job can be reduced to a file on the file-system. If it can, then the atomicity mechanism that I like a lot is rename(), and the cleanup on restart is to compare the contents of directories (eg by piping ls-1 into while read) and remove any partially generated output. Regards, James. > Message: 2 > Date: Thu, 24 Mar 2011 19:21:35 -0700 > From: Michael Smith <drivers(a)mu.org> > Subject: Re: How to tell if system shutdown is in process > To: Jerry Krinock <jerry(a)ieee.org> > Cc: "darwin-kernel(a)lists.apple.com Kernel" > <darwin-kernel(a)lists.apple.com> > Message-ID: <7E685799-1A52-40DB-8B8E-B4050037FCFA(a)mu.org> > Content-Type: text/plain; charset="us-ascii" > > > On Mar 24, 2011, at 10:27 AM, Jerry Krinock wrote: > >> I want my non-GUI command-line program which is launched by user-level launchd to know as early as possible when shutdown is occuring, preferably (for example, if initiated by the console user) immediately when the user clicks the "Shut Down" button in the confirmation dialog, and, at least, before SIGTERMs start getting sent to processes. NSWorkspaceWillPowerOffNotification doesn't work, and IORegisterForSystemPower() doesn't work. Alternatively, I'd like an API to which I could ask before beginning a long task, "Is shutdown in progress?" > > > You should not do this, because what you are actually asking is "will shutdown be initiated during my long task", which is not something that can be answered. > > Instead, you should ask yourself "how can I safely and quickly abort my long task in the rare circumstance where shutdown is signalled while it is in progress?". > > = Mike > > -- > Ars longa, vita brevis, occasio praeceps, experimentum periculosum, iudicium difficile -- Hippocrates _______________________________________________ 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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Classify VNODE SCOPE actions for file operations
by sheetal phirke 25 Mar '11

25 Mar '11

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Re: How to tell if system shutdown is in process
by Michael Smith 25 Mar '11

25 Mar '11

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Re: How to tell if system shutdown is in process
by David Gatwood 24 Mar '11

24 Mar '11

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Re: How to tell if system shutdown is in process
by Jerry Krinock 24 Mar '11

24 Mar '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On 2011 Mar 23, at 14:11, Quinn The Eskimo! wrote: > When you say "started automatically by launchd", do you mean the global system launchd (that is, pid 1) or some per-user launchd? I mean a the current user's launchd (typically pid 130), directed by a plist file which my app installs in ~/Library/LaunchAgents/. > If you're started by the global launchd, you're running in a daemon context and you should not be linking with AppKit (per the rules outlined in Technote 2083 "Daemons and Agents"). I think I'm OK with that. On 2011 Mar 23, at 21:55, Brian Bergstrand wrote: > Use IOKit, specifically, IORegisterForSystemPower(). In the callback you provide check for kIOMessageSystemWillPowerOff and kIOMessageSystemWillRestart. Well, the documentation for IORegisterForSystemPower() states that it is "for the purpose of receiving sleep & wake notifications for the system. Does not provide system shutdown and restart notifications." But I tried Brian's suggestion anyhow, incorporating the sample code given in QA1340 noted by Quinn, http://developer.apple.com/library/mac/#qa/qa1340/_index.html and in the callback, I added case kIOMessageSystemWillPowerOff and case kIOMessageSystemWillRestart. Result: Unfortunately, the documentation is correct. I get callbacks for sleep and wake, but not for shut down. On 2011 Mar 24, at 02:16, Quinn The Eskimo! wrote: > On 24 Mar 2011, at 01:51, Antoine Missout wrote: > >> What is the proper answer to the original question, ie getting the shutdown event in a global context daemon ? > > I don't have a good answer. Well, I think my original question is to getting the shutdown event in a *user* context daemon. The only notification I've been able to receive is SIGTERM. And further testing shows that whatever sends the SIGTERMs to processes during shutdown will *block* sending further SIGTERMs when an app doesn't terminate. I say this because, in my most recent test, this happened: min:sec 00:00 Confirmed by clicking the "Shut Down" button 00:03 Got the first "dirty document" warning from an app. I did not respond. 00:30-00:40 Clicked "Don't Save" in this dialog, and in two others which appeared from two other apps 00:51 My process received SIGTERM ("Finally!!") 01:11 My process was killed So, this is quite worse than I had thought. Let me restate my question, in case this helps: I want my non-GUI command-line program which is launched by user-level launchd to know as early as possible when shutdown is occuring, preferably (for example, if initiated by the console user) immediately when the user clicks the "Shut Down" button in the confirmation dialog, and, at least, before SIGTERMs start getting sent to processes. NSWorkspaceWillPowerOffNotification doesn't work, and IORegisterForSystemPower() doesn't work. Alternatively, I'd like an API to which I could ask before beginning a long task, "Is shutdown in progress?" Thanks, Jerry _______________________________________________ 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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