December 2009 - Darwin-dev - lists.apple.com

Re: Linker is driving me nuts, relocating the start address
by Nat! 20 Dec '09

20 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com By trial and error and putting part of the code in separate shared library, I have now managed to put my method at the desired address (for the morbidly curious see: http://www.mulle-kybernetik.com/weblog/2009/12/some_more_fishing_around_the…) I'd still would be interested to know, out of curiosity, what is going on with the linker. Ciao Nat! --------------------------------------------------- I couldn't work without a deadline. If I retired to some luxurious home by the sea, you know what I would write? Nuthin' ! -- Duke Ellington _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Linker is driving me nuts, relocating the start address
by Nat! 19 Dec '09

19 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com I have the problem, that for testing purposes I want to place an Objective-C message at a certain place in memory. Now my plan is, that I link my foundation console project with -seg1addr 0x35203000 and I have another method in front of the method, that contains a lot of dummy code, that I want to shrink or expand to hit the proper address. + (int) bogus1:(int) x { x = x * x; x = x * x; // and hundreds more... // x = x * x; return( x); } - (id) key { return( _key); } It's not working as I hoped it would be, although the -seg1addr in itself works. The reason being, that the first __text start address changes unpredictably. Here is an example of a link with _more_ bogus1 code: Load command 1 cmd LC_SEGMENT cmdsize 396 segname __TEXT vmaddr 0x35203000 vmsize 0x00002000 fileoff 0 filesize 8192 maxprot 0x00000007 initprot 0x00000005 nsects 5 flags 0x0 Section sectname __text segname __TEXT addr 0x35204544 size 0x000009cd offset 5444 align 2^2 (4) reloff 0 nreloc 0 flags 0x80000400 reserved1 0 reserved2 0 and here with less bogus1 code, as you can see the __text address counterintuitively moved down! I would have expected it to stay the same really. Load command 1 cmd LC_SEGMENT cmdsize 396 segname __TEXT vmaddr 0x35203000 vmsize 0x00002000 fileoff 0 filesize 8192 maxprot 0x00000007 initprot 0x00000005 nsects 5 flags 0x0 Section sectname __text segname __TEXT addr 0x35204684 size 0x0000089b offset 5764 align 2^2 (4) reloff 0 nreloc 0 flags 0x80000400 reserved1 0 reserved2 0 Most of the space between 0x35204684 and 0x35203000 is filled with beautiful nils. So apparently the linker somehow tail aligns the code ? I then added a method bogus2 behind the -key method, but I still can't nail the exact address. I can come close to one byte offset with nops though. I need a clue... Ciao Nat! P.S. If you think this is crazy, see this :) (http://www.mulle-kybernetik.com/weblog/2009/12/my_best_bug_ever.html) the reason I am trying this at all. ------------------------------------------------------ When vanity and rivalry disappear, all the lines go out of your stomach and you slow down and coast slowly to a stop in the middle. -- DLR _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: ucontext switch problem
by Chris Suter 18 Dec '09

18 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi Roger, On Thu, Dec 17, 2009 at 9:56 PM, Roger Pau Monné <royger(a)gmail.com> wrote: > Thanks for the reply, it was very helpful. Now I'm having a problem with the > returning context of swapcontext. I've made something like a user-space > thread library, and all the context of the threads return to the same main > context (all uc_link point to the same ucontext_t), but it seems that only > the first one to end is able to switch the context correctly, the next one > reports a "Bus Error". This only happens when I use a signal handler to > change contexts, so I'm guessing there's something wrong there, but I'm not > able to debug it. Also, this program works on Linux, I've attached the > source, if anyone could take a look, I've been trying to get it to work on > Mac OS X for some days without any luck or progress. The problem is that after the first thread has finished you’re switching to kernel_context and returning to your main function. Later, when another thread terminates, you’re attempting to switch to an out of date context—it points to the same stack but the stack has changed. If it works on Linux, you’ve been lucky—if you were to zero out the stack in your main function after returning, you’d see the same crash on Linux. I trust you’re doing this for purely academic interest since you’ll encounter all kinds of problems with the runtime library (which uses pthreads for its locking). Kind regards, Chris _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: ucontext switch problem
by Roger Pau Monné 17 Dec '09

17 Dec '09

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Re: OT: scriptually? create custom folder icon
by Geoff Lee 16 Dec '09

16 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi Nico, On 15 Dec 2009, at 16:24, Nico Weber wrote: > I wrote some notes on this in the "By the way" section at > http://www.amnoid.de/icns/makeicns.html . This is great info, thanks. Can't believe I missed it in my initial googling! Cheers, -geoff > > On Tue, Dec 15, 2009 at 2:07 AM, Geoff Lee <g.lee(a)ed.ac.uk> wrote: >> >> Hi Folks, >> >> Sorry this is a bit off topic but this seems like the kind of place I might find an answer. I want to assign a custom icon to a folder using, ideally, a bit of shell script/perl/python, though I'm not averse to building a little binary if that will do the trick. >> >> Looking at the the custom icon file that gets created when changing the icon in the 'get info' window, the data in the resource fork seems to be the same as a .icns file but with an extra 100 or so bytes of stuff on the front, which I can't grok. >> >> Even if I could, since stuffing bytes into an apparently undocumented blob of data is a recipe for breakage I'd be delighted if anyone could point me in the direction of a supported API :) >> >> Many TIA, >> >> -geoff >> ______________________________________ >> Geoff Lee <G.Lee(a)ed.ac.uk> >> Computing Support >> School of Arts, Culture and Environment >> University of Edinburgh >> 20 Chambers St, >> Edinburgh, Scotland, >> EH1 1JZ >> Tel: +44 (0)131 650 2341 >> ______________________________________ >> >> >> >> >> >> >> >> -- >> The University of Edinburgh is a charitable body, registered in >> Scotland, with registration number SC005336. >> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) >> Help/Unsubscribe/Update your Subscription: >> http://lists.apple.com/mailman/options/darwin-dev/thakis%40chromium.org >> >> This email sent to thakis(a)chromium.org >> > ______________________________________ Geoff Lee <G.Lee(a)ed.ac.uk> Computing Support School of Arts, Culture and Environment University of Edinburgh 20 Chambers St, Edinburgh, Scotland, EH1 1JZ Tel: +44 (0)131 650 2341 ______________________________________ -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: OT: scriptually? create custom folder icon
by Nico Weber 15 Dec '09

15 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d=google.com; s=beta; t=1260894251; bh=65Gh1HR/tSwAk9S4Ut7+gAxUl6k=; h=MIME-Version:Sender:In-Reply-To:References:Date:Message-ID: Subject:From:To:Cc:Content-Type:Content-Transfer-Encoding; b=M0dbJ908nSu8u5ODqHGWWb+A6j9Ir7U9jNTFJ1wI7z9SUsnyhVRxBrErDoK0brfiH r0BaYdi+TOzLCSAkd6vKA== Domainkey-signature: a=rsa-sha1; s=beta; d=google.com; c=nofws; q=dns; h=mime-version:sender:in-reply-to:references:date: x-google-sender-auth:message-id:subject:from:to:cc:content-type: content-transfer-encoding:x-system-of-record; b=BauZ9p0Y2/ZuuDBQFKojY2lSLcqWBkUqfoRuINmWbtQODrnSNkEbo42U/oSYBn+ve /8yJfetJcxaYhqrRsbMdg== I wrote some notes on this in the "By the way" section at http://www.amnoid.de/icns/makeicns.html . On Tue, Dec 15, 2009 at 2:07 AM, Geoff Lee <g.lee(a)ed.ac.uk> wrote: > > Hi Folks, > > Sorry this is a bit off topic but this seems like the kind of place I might find an answer. I want to assign a custom icon to a folder using, ideally, a bit of shell script/perl/python, though I'm not averse to building a little binary if that will do the trick. > > Looking at the the custom icon file that gets created when changing the icon in the 'get info' window, the data in the resource fork seems to be the same as a .icns file but with an extra 100 or so bytes of stuff on the front, which I can't grok. > > Even if I could, since stuffing bytes into an apparently undocumented blob of data is a recipe for breakage I'd be delighted if anyone could point me in the direction of a supported API :) > > Many TIA, > > -geoff > ______________________________________ > Geoff Lee <G.Lee(a)ed.ac.uk> > Computing Support > School of Arts, Culture and Environment > University of Edinburgh > 20 Chambers St, > Edinburgh, Scotland, > EH1 1JZ > Tel: +44 (0)131 650 2341 > ______________________________________ > > > > > > > > -- > The University of Edinburgh is a charitable body, registered in > Scotland, with registration number SC005336. > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-dev/thakis%40chromium.org > > This email sent to thakis(a)chromium.org > _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: OT: scriptually? create custom folder icon
by Geoff Lee 15 Dec '09

15 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 15 Dec 2009, at 10:11, Mo McRoberts wrote: > On 15-Dec-2009, at 10:07, Geoff Lee wrote: >> >> Sorry this is a bit off topic but this seems like the kind of place I might find an answer. I want to assign a custom icon to a folder using, ideally, a bit of shell script/perl/python, though I'm not averse to building a little binary if that will do the trick. > > You want the Rez and SetFile utilities, which will do it for you. > > (a script which I have to do it as part of a build here, adjust ${CONFIGURATION_TEMP_DIR}/icon-resource.icns to suit): Fantastic. I had never noticed the Rez tool before: it's exactly what I need. Thanks a lot! -geoff > > #! /bin/sh > > icon="$SCRIPT_INPUT_FILE_0" > target="$SCRIPT_OUTPUT_FILE_0" > > REZ=/Developer/usr/bin/Rez > SETFILE=/Developer/usr/bin/SetFile > > cp "$icon" ${CONFIGURATION_TEMP_DIR}/icon-resource.icns || exit $? > echo "read 'icns' (-16455) \"icon-resource.icns\";" > ${CONFIGURATION_TEMP_DIR}/icon-resource.r > ifile="`printf \"$target/Icon\r\"`" > $REZ -o "$ifile" ${CONFIGURATION_TEMP_DIR}/icon-resource.r || exit $? > rm -f ${CONFIGURATION_TEMP_DIR}/icon-resource.icns > rm -f ${CONFIGURATION_TEMP_DIR}/icon-resource.r > $SETFILE -a C "$target" > $SETFILE -a V "$ifile" > > Cheers, > > Mo. > > -- > mo mcroberts > http://nevali.net > iChat: mo.mcroberts(a)me.com Jabber/GTalk: mo(a)ilaven.net Twitter: @nevali > > Run Leopard or Snow Leopard? Set Quick Look free with DropLook - http://labs.jazzio.com/DropLook/ > > > > > > > > > ______________________________________ Geoff Lee <G.Lee(a)ed.ac.uk> Computing Support School of Arts, Culture and Environment University of Edinburgh 20 Chambers St, Edinburgh, Scotland, EH1 1JZ Tel: +44 (0)131 650 2341 ______________________________________ -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: OT: scriptually? create custom folder icon
by Mo McRoberts 15 Dec '09

15 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 15-Dec-2009, at 10:07, Geoff Lee wrote: > > Hi Folks, > > Sorry this is a bit off topic but this seems like the kind of place I might find an answer. I want to assign a custom icon to a folder using, ideally, a bit of shell script/perl/python, though I'm not averse to building a little binary if that will do the trick. You want the Rez and SetFile utilities, which will do it for you. (a script which I have to do it as part of a build here, adjust ${CONFIGURATION_TEMP_DIR}/icon-resource.icns to suit): #! /bin/sh icon="$SCRIPT_INPUT_FILE_0" target="$SCRIPT_OUTPUT_FILE_0" REZ=/Developer/usr/bin/Rez SETFILE=/Developer/usr/bin/SetFile cp "$icon" ${CONFIGURATION_TEMP_DIR}/icon-resource.icns || exit $? echo "read 'icns' (-16455) \"icon-resource.icns\";" > ${CONFIGURATION_TEMP_DIR}/icon-resource.r ifile="`printf \"$target/Icon\r\"`" $REZ -o "$ifile" ${CONFIGURATION_TEMP_DIR}/icon-resource.r || exit $? rm -f ${CONFIGURATION_TEMP_DIR}/icon-resource.icns rm -f ${CONFIGURATION_TEMP_DIR}/icon-resource.r $SETFILE -a C "$target" $SETFILE -a V "$ifile" Cheers, Mo. -- mo mcroberts http://nevali.net iChat: mo.mcroberts(a)me.com Jabber/GTalk: mo(a)ilaven.net Twitter: @nevali Run Leopard or Snow Leopard? Set Quick Look free with DropLook - http://labs.jazzio.com/DropLook/ _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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OT: scriptually? create custom folder icon
by Geoff Lee 15 Dec '09

15 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi Folks, Sorry this is a bit off topic but this seems like the kind of place I might find an answer. I want to assign a custom icon to a folder using, ideally, a bit of shell script/perl/python, though I'm not averse to building a little binary if that will do the trick. Looking at the the custom icon file that gets created when changing the icon in the 'get info' window, the data in the resource fork seems to be the same as a .icns file but with an extra 100 or so bytes of stuff on the front, which I can't grok. Even if I could, since stuffing bytes into an apparently undocumented blob of data is a recipe for breakage I'd be delighted if anyone could point me in the direction of a supported API :) Many TIA, -geoff ______________________________________ Geoff Lee <G.Lee(a)ed.ac.uk> Computing Support School of Arts, Culture and Environment University of Edinburgh 20 Chambers St, Edinburgh, Scotland, EH1 1JZ Tel: +44 (0)131 650 2341 ______________________________________ -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: ucontext switch problem
by Jean-Daniel Dupas 14 Dec '09

14 Dec '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Le 14 déc. 2009 à 02:12, Chris Suter a écrit : > Hi Steve, > > On Mon, Dec 14, 2009 at 12:02 PM, Steve Checkoway <s(a)pahtak.org> wrote: > >> Is that documented somewhere? The man pages don't mention it. <http://developer.apple.com/mac/library/qa/qa2005/qa1419.html> just says it must be a multiple of 4096 bytes. > > The only documentation I found was the source code, but I haven’t > really looked. :-) It's not even part of the API if fact. There is no guarantee it remains stable between system updates: http://lists.apple.com/archives/darwin-dev/2009/Aug/msg00044.html -- Jean-Daniel _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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