May 2004 - Darwin-kernel - lists.apple.com

Re: HFS, HFS+ , HFS Journaled
by Brian Tabone 25 May '04

25 May '04

IMHO Apple is very forthcoming with all of the low level workings for OS X, check here for info on HFS http://developer.apple.com/technotes/tn/tn1150.html The search at developer.apple.com is very effective and finding pointers to tech documents and other documentation for the internal workings of X. -Brian On May 24, 2004, at 8:04 PM, Matt Jaffa wrote: Hi, I was wondering if there was some sort of whitesheet, datasheet, whatever they are called, that explains how these file systems are arranged, Like for FAT, Microsoft released a PDF on how FAT12,FAT16, and FAT32 work, with diagrams and everything, explaining the boot sector and how free space is kept track of and the directory structure. Anything like this exist for Apples Filesystems? do they release that info? Thanks, Matt _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored. _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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HFS, HFS+ , HFS Journaled
by Matt Jaffa 25 May '04

25 May '04

Hi, I was wondering if there was some sort of whitesheet, datasheet, whatever they are called, that explains how these file systems are arranged, Like for FAT, Microsoft released a PDF on how FAT12,FAT16, and FAT32 work, with diagrams and everything, explaining the boot sector and how free space is kept track of and the directory structure. Anything like this exist for Apples Filesystems? do they release that info? Thanks, Matt _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Booting different kernels
by Roger Midmore 24 May '04

24 May '04

On Mon, 24 May 2004, Manjunatha N wrote: I don't know if you are trying to boot Darwin from different partitions on your hard drive are not or even if you want to have the option to choose the kernel from open firmware like LILO but I would definetely recommend reading the Fundamentals of Open Firmware on ADC that should have all the information you will need to do whatever you want. > Hello, > > I am able to complie the Darwin kernel on Mac OS 10.3 but i want to know how > to have dual boot which can give me options to boot with different kernels. > > Can u also tell me which file to edit for dual boot? > > Also is there any problem to the hardware if i boot from a different kernel? > > Thanks > _______________________________________________ > darwin-kernel mailing list | darwin-kernel(a)lists.apple.com > Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel > Do not post admin requests to the list. They will be ignored. _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: ?? SSH Terminal Sessions unexpectedly pausing/freezing ??
by OpenMacNews 24 May '04

24 May '04

Thought: One thing that may be a good idea is to capture a tcpdump trace of these happenings, specifically on (4), sudo tcpdump -w ssh-log.tcp port ssh Will write out all the packets involved to ssh-log.tcp. You can then see what was dumped out with tcpdump -r. If you email me the ssh-log.tmp I'll have3 a look for you as well. Cheers, aid thanks! someone else (wisely?) questioned the reliability of the Asante driver for the Ethernet card on (4), as its apparently a mite old ... although "on the surface" its working, "under the hood" it's suspect with OSX >= v10.3 ! That said, I've ripped out the card and am off to buy a "modern" replacement and update to latest drivers ... Once installed, I'll try again. if no joy, then I'll trouble you for some godlike analysis of tcpdump output (yech!) thanks, richard _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: ?? SSH Terminal Sessions unexpectedly pausing/freezing ??
by Adrian Bool 24 May '04

24 May '04

Hi There, Common problem for 'weird' stuff like this is incorrect duplex / non-duplex settings between your host and switch. Probably not your problem but worth checking out! Good luck, aid On 24 May 2004, at 19:57, OpenMacNews wrote: hi all, i'm having an SSH Terminal Session "issue". i'm honestly not sure where to turn on this one ... I can't even detemine what the right diagnostics are -- nothing happening in kernel/sys/app logs. any pointers/ideas/solution/etc are much appreciated! (if this is the WRONG list, please suggest an alternative ... i've already tried the "secureshell" list -- no joy there yet) so, here we go ... i've a 4 machine setup (yes I understand some of these are "modified" &/or "unsupported" configs): (1) G4 PowerBook OSX 10.3.3 (2) 8500 Sonnet G3/333 upgrade Sonnet TEMPO 66 ATA card (2 drives on Sonnet ... none on internal bus) 2 Asante 696 10/100 Ethernet Cards (manually config'd to 100bT & FullDuplex) OSX 10.2.8 w/ XPostFacto 3.0a17 & L2CacheConfig (3) 8500 Sonnet G3/333 upgrade Sonnet TEMPO 66 ATA card (2 drives on Sonnet ... none on internal bus) Asante 690 10/100 Ethernet Card (manually config'd to 100bT & FullDuplex) OSX 10.2.8 w/ XPostFacto 3.0a17 & L2CacheConfig (4) Beige G3 Sonnet G4/500 upgrade Sonnet TEMPO 66 ATA card (2 drives on Sonnet ... ONE on internal bus) Asante 590 10/100 Ethernet Card (manually config'd to 100bT & FullDuplex) OSX 10.3.3 w/ XPostFacto 3.0a17 & PowerLogix CPU Director 1.5.2 These machines define an internal/private network w/ internet access: Public Internet | DSL Modem | | (2) IPFW firewall & NATD instance | | 10/100bT Ethernet Switch | | |------- (1) | | |------- (3) | | |------- (4) All machines have OpenSSL 0.9.7d + OpenSSH 3.8.1p1 locally compiled/installed ... OpenSSH is configured to use only Protocol2, PublicKeyAuthentication (1024 bit RSA keys), and TCP Wrappers. SSHD runs as an 'on demand' service via xinetd, with TCP Wrappers controlling/limiting access via the usual hosts.allow/hosts.deny configs. With my authentication/access scheme, I can SSH FROM any machine TO any machine, as expected. The "issue" arises in SSH'ing *TO* (4), the upgraded Beige G3, from any/every other machine. Specifically, once an SSH session is open/active, any task requiring a "lot" of data (example: "ls -al" of a large DIR) to be transferred via terminal session pauses (always) after a fraction of the expected data is transferred and (frequently) hangs the session. Again, this ONLY happens in sessions TO machine (4) from OTHER machines. Sessions opened: (a) between other machines (b) from (4) to other machines (c) from (4) to itself ... ALL operate at "full speed" with NO apparent pauses/hangs in the terminal sessions. So far, in efforts to remediate, I've: (a) changed Ehternet MTU settings from 1500 to 576, both in pair combinations and 'en masse' (b) varied Client, Server and TCP timeouts in ssh_config & sshd_config (c) Turned session Compression "off" (c) turned off xinetd service of sshd, and reverted to standard daemon mode NONE of these effort changed/improved the session behavior TO (4). Any suggestions as to where to look next? I'm not even certain, yet, whether I'm missing something, or whether there actually is an issue here .... Thanks, Richard _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored. _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: ?? SSH Terminal Sessions unexpectedly pausing/freezing ??
by Lassi A.Tuura 24 May '04

24 May '04

Any suggestions as to where to look next? I'm not even certain, yet, whether I'm missing something, or whether there actually is an issue here .... Try running your sshd with -vvv options, or probably more interestingly, attach ktrace to it. You'll see what hangs and where. If you are able to access the system, attach debugger to the hung process (look at ps output to see process states to see what's hung), and get the backtrace -- it will probably help you see why it's hung. If it's not sshd that hangs, you can use ktrace on other parts of the system. Lassi -- Behold the turtle. He makes progress only when he sticks his neck out. --James Bryant Conant _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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?? SSH Terminal Sessions unexpectedly pausing/freezing ??
by OpenMacNews 24 May '04

24 May '04

hi all, i'm having an SSH Terminal Session "issue". i'm honestly not sure where to turn on this one ... I can't even detemine what the right diagnostics are -- nothing happening in kernel/sys/app logs. any pointers/ideas/solution/etc are much appreciated! (if this is the WRONG list, please suggest an alternative ... i've already tried the "secureshell" list -- no joy there yet) so, here we go ... i've a 4 machine setup (yes I understand some of these are "modified" &/or "unsupported" configs): (1) G4 PowerBook OSX 10.3.3 (2) 8500 Sonnet G3/333 upgrade Sonnet TEMPO 66 ATA card (2 drives on Sonnet ... none on internal bus) 2 Asante 696 10/100 Ethernet Cards (manually config'd to 100bT & FullDuplex) OSX 10.2.8 w/ XPostFacto 3.0a17 & L2CacheConfig (3) 8500 Sonnet G3/333 upgrade Sonnet TEMPO 66 ATA card (2 drives on Sonnet ... none on internal bus) Asante 690 10/100 Ethernet Card (manually config'd to 100bT & FullDuplex) OSX 10.2.8 w/ XPostFacto 3.0a17 & L2CacheConfig (4) Beige G3 Sonnet G4/500 upgrade Sonnet TEMPO 66 ATA card (2 drives on Sonnet ... ONE on internal bus) Asante 590 10/100 Ethernet Card (manually config'd to 100bT & FullDuplex) OSX 10.3.3 w/ XPostFacto 3.0a17 & PowerLogix CPU Director 1.5.2 These machines define an internal/private network w/ internet access: Public Internet | DSL Modem | | (2) IPFW firewall & NATD instance | | 10/100bT Ethernet Switch | | |------- (1) | | |------- (3) | | |------- (4) All machines have OpenSSL 0.9.7d + OpenSSH 3.8.1p1 locally compiled/installed ... OpenSSH is configured to use only Protocol2, PublicKeyAuthentication (1024 bit RSA keys), and TCP Wrappers. SSHD runs as an 'on demand' service via xinetd, with TCP Wrappers controlling/limiting access via the usual hosts.allow/hosts.deny configs. With my authentication/access scheme, I can SSH FROM any machine TO any machine, as expected. The "issue" arises in SSH'ing *TO* (4), the upgraded Beige G3, from any/every other machine. Specifically, once an SSH session is open/active, any task requiring a "lot" of data (example: "ls -al" of a large DIR) to be transferred via terminal session pauses (always) after a fraction of the expected data is transferred and (frequently) hangs the session. Again, this ONLY happens in sessions TO machine (4) from OTHER machines. Sessions opened: (a) between other machines (b) from (4) to other machines (c) from (4) to itself ... ALL operate at "full speed" with NO apparent pauses/hangs in the terminal sessions. So far, in efforts to remediate, I've: (a) changed Ehternet MTU settings from 1500 to 576, both in pair combinations and 'en masse' (b) varied Client, Server and TCP timeouts in ssh_config & sshd_config (c) Turned session Compression "off" (c) turned off xinetd service of sshd, and reverted to standard daemon mode NONE of these effort changed/improved the session behavior TO (4). Any suggestions as to where to look next? I'm not even certain, yet, whether I'm missing something, or whether there actually is an issue here .... Thanks, Richard _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Booting different kernels
by Felix Kronlage 24 May '04

24 May '04

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On May 24, 2004, at 07:04 Uhr, Manjunatha N wrote: Hi, I am able to complie the Darwin kernel on Mac OS 10.3 but i want to know how to have dual boot which can give me options to boot with different kernels. Can u also tell me which file to edit for dual boot? while it really needs an update to 10.3.x the XNU Howto over at OpenDarwin does explain how to boot a differently named kernel. <url: http://www.opendarwin.org/doc/en/articles/building_xnu/ building_xnu.php> - -fkr - -- gpg-fingerprint: 076E 1E87 3E05 1C7F B1A0 8A48 0D31 9BD3 D9AC 74D0 Felix Kronlage | FKR-RIPE | http://www.hazardous.org/fkr/ fkr(a){bytemine.net|opendarwin.org} | http://opendarwin.org/~fkr/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (Darwin) iD8DBQFAsZN+DTGb09msdNARAjOrAJ9stv/lU57iSc3nXJw6IiWCRZtPSQCdGDwB uZ1lDdB/SKcc2OtRq5kSmmU= =dnoC -----END PGP SIGNATURE----- _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Booting different kernels
by Manjunatha N 24 May '04

24 May '04

Hello, I am able to complie the Darwin kernel on Mac OS 10.3 but i want to know how to have dual boot which can give me options to boot with different kernels. Can u also tell me which file to edit for dual boot? Also is there any problem to the hardware if i boot from a different kernel? Thanks _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: External Hard Disk Stuff
by Matt Jaffa 23 May '04

23 May '04

Thanks, That was it, it was still mounted. Also questions with how Apple's Disk utility Formats it as MS-DOS, does it format as FAT 16 or FAT32 cause when I read the Boot info, it says FAT16 as the FS type and BSD 4.4 as the BS_OEMName. Also where would I find the bootsector structure for the MS-DOS FS that Apple's Disk Utility makes when you format the Drive as MS-DOS. thanks, Matt On May 23, 2004, at 1:41 PM, Justin Walker wrote: On May 23, 2004, at 11:48, Matt Jaffa wrote: Hi, I am wanting to be able to have access to my external HD by opening it up using something like open(......); and reading the bootsector and switching Sectors around and stuff. My questions might be screwy, but I don't know how to go about doing this, I don't know if I have to write a kernel Extension or if I can do this in User space. Basically I want to mess around with an External HD that is formatted totally in MS-DOS. So what do I need to do to get access to the drive. When I do open(.....) in user space, it says the drive is busy. That is usually an indication that the drive/partition is mounted as a file system. Check with the 'mount' command to see whether this is the case. You should be able to access the "raw" partition if it's unmounted (and file permissions for /dev/whatever are correct). You might want to look at some file system and 'boot' code to see how to interpret the partition data. And yes, you can read and write disk partitions in user mode. Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large * Institute for General Semantics | It's not whether you win or lose... | It's whether *I* win or lose. *-------------------------------------- *-------------------------------* _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored. _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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