May 2006 - Darwin-dev - lists.apple.com

Need help building AVR toolchain
by Rick Mann 15 May '06

15 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Oh, here's some info from the other lists: On suggestion: If you compile with -g, the linker would tell you who caused the undefined reference (file name + line number + maybe calling function). For me (FreeBSD 6.x), it appears that this symbol is never referenced directly. Instead, <libintl.h> inlines calls to dcgettext() into calls to libintl_dcgettext(), and they are resolved to -lintl. I looked, and -g seems to be in the gcc lines already. Thanks! -- Rick _______________________________________________ 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… I've been using a slightly older version of the latest AVR (Atmel microcontroller) toolchain (the GNU tools targeted for AVR). The GNU tools build fine, actually, but the tool to bridge gdb with the JTAG hardware is giving me trouble. Here's the output of the last part of the make process: $ make Making all in scripts make[1]: Nothing to be done for `all'. Making all in src make all-am g++ -g -O2 -L/usr/local/avr/i686-apple-darwin8.6.1/avr/lib -lbfd - L/usr/local/avr/lib -o avarice crc16.o devdescr.o ioreg.o jtag2bp.o jtag2io.o jtag2misc.o jtag2prog.o jtag2run.o jtag2rw.o jtag2usb.o jtagbp.o jtaggeneric.o jtagio.o jtagmisc.o jtagprog.o jtagrun.o jtagrw.o main.o remote.o utils.o gnu_getopt.o gnu_getopt1.o -lusb -lbfd -liberty -liconv /usr/bin/ld: Undefined symbols: _dcgettext collect2: ld returned 1 exit status make[2]: *** [avarice] Error 1 make[1]: *** [all] Error 2 make: *** [all-recursive] Error 1 It's unable to find "_dcgettext", and I'm out of ideas. I've posed this question on the AVR list, but I haven't gotten very far because of the relatively few number of darwin users. Perhaps someone on this list can tell me what's missing? Instructions for building the entire toolchain can be found here: <http://www.ee.ucla.edu/~ram/misc.html>. The difference for me is that I put everything under --prefix=/usr/local/avr, and I took the latest versions of everything (including avarice-2.4). Note that building avarice requires libbfd from binutils. I did successfully build avarice-2.4 on my PowerPC PowerBook, once upon a time. I remember trying to update my tools to the latest versions on that machine, and having some trouble, although I don't recall if it was this problem or something else. I'm now building on an Intel MBP. In two days, I'm going to desperately need to be able to run avarice. Any help would be much appreciated! Thank you! This email sent to site_archiver(a)lists.apple.com

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StartupItems
by André-John Mas 14 May '06

14 May '06

site_archiver(a)lists.apple.com Delivered-To: Darwin-dev(a)lists.apple.com Hi, { Description = "miredo client"; Provides = ("teredo"); Requires = ("ethertap","tun"); OrderPreference = "None"; } Andre _______________________________________________ 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… I am writing a startup item for an application called Miredo, and have the following for my StartUpParameters.plist: Does this look right? Should the provides be referring to the program name or the 'technology' being implemented. What I mean by this, is that Miredo is an implementation of Teredo, so should I indicate provides 'teredo' or 'miredo'? This email sent to site_archiver(a)lists.apple.com

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MoreBacktrace for intel ...
by Brendan Creane 13 May '06

13 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:Received:Date:From:Subject:To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=OW2ky6WkNR6r36pjRCFczKDX0VQxjL5wZXVysaCc0ITbiussXQy+xmos+Tihu2hBb/9RcVecprkXIgV3PGqeu+0abni91NzzXBwQdU+PduinEkL2pvEnbWnVrOy1DsFR7xSnHcROfnr+m8UlC/ofE4NoDI0JgOFBS0f9LWYprYw= ; I've been studying the marvelous backtrace code in "MoreIsBetter" from the inestimable Quinn with the intention of dumping all the running pthread stacks in a darwin executable. Has anyone come across a version of MoreBacktrace.[ch] that supports 64-bit PPC, or more interestingly 32/64bit Intel processors? thanks, Brendan An aside: [One of the trickier pieces of the puzzle is finding the stack frame while processing a signal (action). There are heuristically derived constants indicating how far back from the _sigtramp routine's frame to jump -- constants that change according to which release of darwin you're running. Linux avoids the whole problem by (somehow) not munging up the stack when processing a signal.] _______________________________________________ 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: OpenDirectory: creating a LocalCachedUser?
by Michael Bartosh 13 May '06

13 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On May 9, 2006, at 3:05 PM, Brian Bergstrand wrote: These are 2 seperate questions, since that's not what a chached user is: /System/Library/CoreServices/mcxd.app/Contents/Resources/MCXCacher MCXCacher -U usershortname [-h homepath] -mb _______________________________________________ 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… How do I now turn this user record into a local cached user so that a user can actually login to the GUI using only the remote DS credentials? Local users may have kerberos or Password Server Auth Authorities allowing them to authenticate against remote auth stores .. This email sent to site_archiver(a)lists.apple.com

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Re: How does one get the OS Product name programmatically?
by Peter Bierman 12 May '06

12 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com -pmb _______________________________________________ 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… At 11:39 AM -0700 5/10/06, David Litwin wrote: >From posts on macos-x-server I see that "sw_vers -productName" will give me exactly what I am looking for (i.e. whether I am running Mac OS X or Mac OS X Server), but I'd like to get this within my program without having to shell out to a tool (it gets it from *some* API). The tool _IS_ the API. The tool is available on all versions of Mac OS X, and properly tests the files wherever they may be. Using the tool is far less fragile than the other suggestions given in this thread. This email sent to site_archiver(a)lists.apple.com

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Re: How does one get the OS Product name programatically?
by Garth Cummings 12 May '06

12 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com _______________________________________________ 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: Shared mmap and data consistency upon a crash
by Michael Smith 12 May '06

12 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On May 11, 2006, at 12:02 PM, darwin-dev-request(a)lists.apple.com wrote: Send Darwin-dev mailing list submissions to Date: Wed, 10 May 2006 23:38:20 +0200 From: Felix Schwarz <felix.schwarz(a)iospirit-gmbh.de> Subject: Re: Shared mmap and data consistency upon a crash To: darwin-dev(a)lists.apple.com Cc: Michael Smith <msmith(a)freebsd.org> Am 10.05.2006 um 21:28 schrieb Michael Smith: I maybe should have added what it is that I'm writing: I'm writing a specialized, server-less database link library (similiar to SQLite by concept, my link library has only *very* basic functionality, though). The idea behind using mmap() is to pull indexed records into and out of a file as fast as possible and take advantage of any caching by the VMM, especially regarding the table inside the file that keeps record of all the records it stores. Using the VM for caching in this case does have some advantages if you're trying to keep your code simple. Bear in mind though that you'll typically get LRU behaviour on cached data, so your indexes will only stay resident to the extent that you keep them hot. Since I've read elsewhere you can't mmap() files that are located on a network-volume, I've also written a fallback using read()/write()/ lseek().. You can, but there is no graceful recovery. You are better off using pread/pwrite, since that will allow you to multi-thread portions of your I/O code as well as saving you a system call per op. Mmap will also give you issues once your database starts to get large, while file I/O will tend to scale better. It appears, that, in both cases, the data in the file seems to be in sync when crashing. I could observe both a delay before any changes could be made to the file after an instant restart of the little test app plus the data that was written last could be reread correctly. With either method. Assuming the crash happens when the data in the object (either via memory write or write system call) is consistent, you should be OK. Note that if the app crashes in e.g. another *thread* while you are in the middle of an update to your datastructures, all bets are off. You can be pre-empted or terminated at any time, and the object will be flushed to disk as-is. This is one argument for using a journal and system calls; as a general rule, writes to a disk file tend to be atomic - either the write completes, or it doesn't. If your app crashes, all bets are off - assuming you don't know where it crashed, you have no guarantee as to the state of anything it was doing, regardless of whether it had files mapped or not. The way the data is organized in the file and the order in which its data is modified ensures its always in a consistent state - the Note that you don't get any guarantees about what order things are written to disk unless you explicitly sync the file. This is mostly an issue when considering system crashes, though the scenario above w.r.t. crashes on another thread needs to be borne in mind as well. HTH, and good luck! = Mike _______________________________________________ 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… However, I'd still love an official confirmation from a kernel developer (or someone who is literate in that part of the kernel) since - I don't want to base data security on assumptions or lucky observations that may turn out wrong or may change with the next release of OS X - I'd love to use the mmap() solution - .. and then, I'm also plain curious ;-) I'm not going to give you an "official" anything, but I think I've outlined the tradeoffs fairly. 8) This email sent to site_archiver(a)lists.apple.com

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Re: How does one get the OS Product name programatically?
by Finlay Dobbie 11 May '06

11 May '06

site_archiver(a)lists.apple.com Delivered-To: Darwin-dev(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:content-disposition:references; b=eA0OomsNywxlM1BRzIwi2lc2ckJnuKT1J383GOur6rWoi+lhekiYs6fCj6qXAcOaJfFHic59n0r9bDcTPNeUwwLG+o/+Tf1KG4PMe70xJJsP/XKpsTgTkdO6JT/m7F3zb6ofoS7xTRP7XUFZaS2ztuPdESWvrgCrKt1BejDb8ms= If you follow the conversation, you'll note that David suggested those plists in the first instance. Relying on them is probably not recommended, as I don't think there are any guarantees that they won't change across releases of OS X It's probably your best but until there's an actual API, though. -- Finlay make your test file on /System/Library/CoreServices/ServerVersion.plist or /System/Library/CoreServices/SystemVersion.plist load plist copy plist into dict get keys of dict you needn't CFPriv to do this Best Regards, Plum _______________________________________________ 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/finlay.dobbie%40gmail.com This email sent to finlay.dobbie(a)gmail.com _______________________________________________ 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… On 11/05/06, plumber Idraulico <plumber(a)gnu-darwin.org> wrote: This email sent to site_archiver(a)lists.apple.com

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Darwin, Teredo & Miredo
by Andre-John Mas 11 May '06

11 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi, First off, I hope you don't mind me sharing with you this info: I would like to share with you some great work done, by Rémi Denis-Courmont, on the Miredo project: http://www.simphalempin.com/dev/miredo/ Teredo, is a IPv6 transition technology, developed by Microsoft, to allow computers behind NATs to access IPv6 networks. So far, from my investigations there are very few such solutions, or if there are, they don't generally support Darwin/MacOS X. As of Miredo 0.9.1, there is now at least one solution for IPv6 early adopters :) Andre _______________________________________________ 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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synchronizing hardware with mach_wait_until()?
by Rob Shaw 11 May '06

11 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi, I'm trying to synchronize a piece of hardware to the computer clock, and (after looking at the archives of this list) have arrived at the following strategy: mach_wait_until( end - poll ); while ( mach_absolute_time() < end ); (talk to the hardware) That is, wait until close to the desired time period, then start polling the clock. This works, if I set a "time constraint policy" with thread_policy_set(), and start polling perhaps 1/2 millisecond before the desired time. it appears I can start the hardware within a fraction of a microsecond of the desired computer clock time. However, every few hundred trials, an event will sneak in between the end of the polling and the command to talk to the hardware, which can delay the hardware by 50 microseconds or more. This behavior, after a few experiments, seems independent of the settings of the parameters sent to thread_policy_set(). It looks like the time constraint policy will guarantee a certain number of cycles in the specified period, but not when they will get assigned to the thread. I need very little CPU time, but I'd like the cycles precisely delivered. Is there some way I can execute a command immediately after a timer expires? Or, in principle, could one climb into the kernel and connect to an interrupt from the real-time clock? What's "the right way" to do this? Thanks, rob _______________________________________________ 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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