June 2008 - Darwin-dev - lists.apple.com

'lookupd' fails to query DNS
by Michael Grigoni 10 Jun '08

10 Jun '08

site_archiver(a)lists.apple.com Delivered-To: Darwin-dev(a)lists.apple.com Organization: Cybertheque Museum User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) Greetings, I need to troubleshoot 'lookupd' and resolver behavior on Darwin 8.11.0 (OS X 10.4.11); the target is a netbooted G5 using only NFS mounts and no local mass storage. During boot, test pings in /etc/rc work to resolve FQDNs until 'lookupd' is started, and fail thereafter. I have set up 'darwinbuild' and compiled the 'netinfo' package (contains lookupd and the resolver libs) and with the new binaries, the behavior persists. Previous experiments netbooting Darwin 8.0.1 (from the Apple ISO) on this same machine did not produce this behavior (resolver worked after starting lookupd). Kernel traces and 'lookup -d' output are here: http://www.cybertheque.org/sw/darwin/lookupd-debug A similar issue is mentioned on a number of IPhone development websites but the workarounds don't work here. I would appreciate insights from those folks more familiar with the implementation and suggestions for introducing debugging into the code for 'lookupd' and the resolver (and perhaps appropriate libc routines). Regards, Michael Grigoni Cybertheque Museum _______________________________________________ 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: USB Serial - RS232
by Andre-John Mas 10 Jun '08

10 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 8-Jun-08, at 14:49 , Allen Curtis wrote: Good news! http://sourceforge.net/projects/osx-pl2303/ 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 went to the Prolific website and downloaded the device driver from there. The package claims to be the same version that I have installed. Installed the driver again and then I could see one of the two devices I had purchased. (both of them were Prolific devices according to System Profiler) Now when you plug in the device, a device entry appears in /dev. The SerialPortSample program can find the device! Question: This time when I rebooted the system after installing the driver it said, updating the boot cache. I did not notice this message before. Should this always appear when installing a new driver? Perhaps this will be a clue in the future. If we are talking about a driver for the PL2303 chipset, then there is also an open source version of the driver (different code base to the official driver): This email sent to site_archiver(a)lists.apple.com

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exception handling path
by Neal Sidhwaney 09 Jun '08

09 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:mime-version:content-type; bh=Y+ThnqtoYQuSFRXCDzsO/dgSH6KD6V8YVu3OltcPGK0=; b=V4buQcO9Fde2s7kx8wRewRzRoCbqwr0Klt79FHNvbLG9YLji0/jSM6qK92xa3jkqVY R9IYiwxBkPYCsIi9/vJiONi4WOd8yb5BtbUGim24LwIVOGMGRpYERwVQ2mBw49sNMcCY AoMau7ZjDurKrBhEC9igt72SieOv0e66qiCl4= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type; b=reVmZRvgz9hfxPZKG1tPW81tpVajEaHJsVlw/oZnki68BTMTQp8a+InvvMD3BVHx0e iYD1fNs19J7Q9BDJA1XNPO4isjLgWdh0969/mYifBbuHja8OHAB1Nzj3vJLUmM7m4R0y qgfqupGUC4pQwl6x6rGivGoK9shlTVrD00BPk= _______________________________________________ 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: USB Serial - RS232
by Garth Cummings 09 Jun '08

09 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi Allen, On Jun 8, 2008, at 11:24 AM, Allen Curtis wrote: --gc ____________________________________________________________________ Garth Cummings gcummings(a)apple.com Sr. Software Engineer Apple Developer Technical Support <http://developer.apple.com/technicalsupport> WWDC 2008 • June 9-13 • Moscone West • San Francisco, CA <http://developer.apple.com/wwdc/> _______________________________________________ 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… Ok, If I list the contents of the /dev directory, both before and after the device is connected, I do not see a new device file created. You should, if the device is functioning and its driver is properly installed. Could USB serial not be in the standard OS X kernel configuration? The problem is that most USB serial adapters are vendor-specific devices, so there's no class driver to handle them. The vendor should have a Mac OS X driver for their device. It's also possible the driver wasn't installed properly. This email sent to site_archiver(a)lists.apple.com

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Re: USB Serial - RS232
by Garth Cummings 09 Jun '08

09 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi Allen, On Jun 7, 2008, at 7:04 PM, Allen Curtis wrote: HTH, --gc ____________________________________________________________________ Garth Cummings gcummings(a)apple.com Sr. Software Engineer Apple Developer Technical Support <http://developer.apple.com/technicalsupport> WWDC 2008 • June 9-13 • Moscone West • San Francisco, CA <http://developer.apple.com/wwdc/> _______________________________________________ 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 when I run the SerialPortSample program, I only see the Bluetooth devices. That sample as it ships looks only for modem devices. The code is commented to show how to change it to find all known serial ports. This email sent to site_archiver(a)lists.apple.com

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Re: DiskArbitration, unmounting busy due to fseventsd?
by Tim Schooley 09 Jun '08

09 Jun '08

site_archiver(a)lists.apple.com Delivered-To: Darwin-dev(a)lists.apple.com User-agent: Thunderbird 2.0.0.14 (X11/20080505) Hi Terry, Terry Lambert wrote: > On Jun 6, 2008, at 1:44 AM, Tim Schooley wrote: >> Good day! >> >> So here's the setup: >> >> 1) I have a kext that creates an IOBlockStorageDriver. I setup and tear >> down block devices from userspace with an application. >> >> 2) I format these devices by calling standard format commands, such as >> newfs_{hfs,msdos,...}. >> >> 3) Using an application, and the DiskArbitration calls (namely >> DADiskMountWithArguments and DADiskUnmount), I mount these devices to a >> directory on the filesystem. >> >> >> The problem I have is this: >> >> 2.1) I try to unmount a mounted device using DADiskUnmount. >> >> 2.2) This fails because the device is "busy". >> >> - There are no IO operations happening. >> - There are no files open by users. >> - The only file open on the mount point is (output from lsof): >> >> fseventsd 34 root 12u REG 14,4 0 999999999 >> <mountpoint>/.fseventsd/0000000000006478 >> >> 2.3) If I use the kDADiskUnmountOptionForce option in the call to >> DADiskUnmount, it corrupts the filesystem. >> >> So my questions are: >> >> 3.0) Is the fseventsd causing this busy mount point issue? > > Yes. > >> 3.1) What is this fseventsd doing sticking its nose into my mountpoint? > > It is looking for file creations/changes on the device so it can report > them to Spotlight for (re)indexing, or to other clients of fseventsd > (like TimeMachine backup). > > It sticks it's nose in your mount point to create an event log file, > which it then holds open until the disk is unmounted. The intent of the > log file is to ensure that you don't have to rescan the entire disk due > to last minute changes (or that last minute changes will not be indexed > or backed up). Typically such changes represent events that have > occurred, but for which fseventd clients have either been stopped or are > not reading and reacting to events (e.g. at shutdown time, due to > non-ordered shutdown of processes). It technically doesn't actually > need to keep this log file open if it's not actively logging something, > but it does so anyway. > > fseventsd registers a callback with > DARegisterDiskUnmountApprovalCallback to permit it to get notification > of the pending unmount. If you have failed to register an unmount > completion callback, a direct call to the unmount is considered > synchronous instead of asynchronous, and the unmount will fail, since it > does not give fseventd time to close down the log. > >> 3.2) Can I stop the fseventsd from doing this? > > Yes. The mount option MNT_NOBROWSE ("-o nobrowse" on the mount command > line) will prevent fseventd from listening for events on the volume. It > will also disable TimeMachine, Spotlight indexing, and other clients of > fseventd, so this is generally not a good idea. > >> 3.3) Am I missing some sort of call to the fseventsd? > > No, but you are missing registering an unmount completion callback with > DiskArbitration so that the DADiskUnmount is not synchrnously answered > with the only answer available at the time it returns ("busy"). > > -- Terry Many thanks for your information - it has been most helpful! Just a quick question... you say it is not a good idea to use the nobrowse option. But what if the mountpoint contains sensitive data? You probably wouldn't want TimeMachine _or_ Spotlight looking in there. What effects would it have on other fseventd clients? Presumably we're talking about files not showing up in Finder when first created, or the like? Many thanks again. Kind regards, Tim _______________________________________________ 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 signature.asc

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Re: Compiling msdosfs...
by Bart Thissen 09 Jun '08

09 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Organization: ArdisTechnologies bv User-agent: Mozilla-Thunderbird 2.0.0.9 (X11/20080110) and after loading some more darwinbuild build commands: Any idea what is wrong? Cheers, Bart darwinbuild -load zlib _______________________________________________ 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… Now I used an UFS fs type and after fixing dependencies I got to the folowing error: xcodebuild[14723:713] _XCDistributedBuildHostInfoTask encountered an error: Error Domain=NSPOSIXErrorDomain Code=2 UserInfo=0x5585b60 "Operation could not be completed. No such file or directory" dyld: Symbol not found: _kMDQueryDidFinishNotification Referenced from: /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation Expected in: /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation private/var/tmp/msdosfs/build-msdosfs-136~8.sh: line 152: 29785 Trace/BPT trap First, msdosfs is missing some dependencies, you'll probably need to load zlib, bsm, and configd. I still had trouble building it but havnt had a chance to look into it. You could always try copying the missing frameworks off of your host partition. (You'll see what it complains about). To load the dependencies, for example: And the "does not contain an xcode project" is a known bug. Its tracked by <http://darwinbuild.macosforge.org/trac/ticket/1>. The best workaround is to build on a UFS partition (disk image, etc). This email sent to site_archiver(a)lists.apple.com

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Re: USB Serial - RS232
by Daniel G. Kluge 08 Jun '08

08 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Don't know, I just do a kextload and that does it for me :-) Cheers, -daniel [1] Freely adapted from http://www.macosxhints.com/article.php?story=20060105104506687&lsrc=osxh _______________________________________________ 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… Am 08.06.2008 um 20:49 schrieb Allen Curtis: I went to the Prolific website and downloaded the device driver from there. The package claims to be the same version that I have installed. Installed the driver again and then I could see one of the two devices I had purchased. (both of them were Prolific devices according to System Profiler) Now when you plug in the device, a device entry appears in /dev. The SerialPortSample program can find the device! Hello Allen, congratulations, your device made it. It is unfortunately quite a mess with the USB to serial devices. Even though practically all devices you can find (iogear, keyspan, Aten) use the prolific PL2302 chip-set, you have to rely on the vendor to supply an up-to-date driver, that's the theory and the legal contract at least. Unfortunately some of those Venduhs prefer (or at least in the past preferred) to bitch about how unstable Apple's USB kernel Interface was, instead of doing something. If you have a device that doesn't work (due to lack of updated driver), and uses the prolific chip, there is a way to fix that driver [1] : 1. Locate the USB Vendor and Device ids of your USB-to-serial device using System Profiler 2. Edit /System/Library/Extensions/ProlificUsbSerial.kext/Contents/ Info.plist to change idVendor and idProduct (don't forget to do a hex- >dec conversion) 3. Reload the extension And presto you have a driver, for a device whose product manager is still twiddling thumbs on a Leopard compatible driver. Question: This time when I rebooted the system after installing the driver it said, updating the boot cache. I did not notice this message before. Should this always appear when installing a new driver? Perhaps this will be a clue in the future. This email sent to site_archiver(a)lists.apple.com

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Re: USB Serial - RS232
by Allen Curtis 08 Jun '08

08 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type:references; bh=M8FUBeWm4UqUzbSbb4EidfUfqMq9jYdXZWQ2nf2Oumg=; b=MjG0me2XbmvXa1qd3dmgd0ALchra+DDPoebYKEvaCGoe+PdbDE2ErpNnaWSpyesYeG mtun/AS4xvcW8vngrfUJ7Yh8AjgGUEYEy3z598mP/RY1J1lWG/7JfD+TIESmsEsZvFR4 3zKMBFIJ50BB3tHXjJ99+VQI/pPsgBU0I3Auc= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:references; b=mHAP0gpsFwhg0dmfjMjf1UJ+ERhOODf5zbHUO5cgUwBYsqbtiSKgUk9McRJHplGrtZ kE94CHdowx1NYXPhsthnrK9ZO8/rTxcsRQvBPxHgCGWkrjjqTILb8v/TcL10nTuV7BFM uTGfVJyfEzO2YfcLzoqoOG6ftcs5QRduZc33A= _______________________________________________ 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: USB Serial - RS232
by Ben Greenfield 08 Jun '08

08 Jun '08

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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