February 2005 - Darwin-kernel

Re: booting a custom darwin kernel on a powerbook
by Markus Hitter 06 Feb '05

06 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Am 06.02.2005 um 00:37 schrieb Folkert Saathoff: hello list, Have you flushed the meta-kext as well? Hope this helps at least a little, Markus - - - - - - - - - - - - - - - - - - - Dipl. Ing. Markus Hitter http://www.jump-ing.de/ _______________________________________________ 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.… i have managed to build a custom mach_kernel from the 10.3/7.0 sources at apple.com. i even managed to tell openfirmware to boot it, sudo mv /System/Library/Extensions.mkext /System/Library/Extensions.mkext.old (Not sure wether this is the right way to do it but I remember a non updated mkext can cause issues) how do i build a kernel with support for the powerbooks hardware? Most or all harware support was moved out of the kernel to extensions a long time ago. To get harware support, you have to fix the extentsions issue. or rather, where do i get the sources for the ApplePMU extension? You don't. It's closed source. Even a plain Darwin installation has a few closed source binaries. See the OpenDarwin CVS repository in src/Apple, IIRC. and how do i install the extensions so that they can coexist with the already installed extensions of the same name? You have to give them at least a different file name, of course. Kexts support some versioning and XPostFacto (open source at OpenDarwin.org) uses it to it's advantage. Don't know details, sorry. This email sent to site_archiver(a)lists.apple.com

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booting a custom darwin kernel on a powerbook
by Folkert Saathoff 05 Feb '05

05 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com hello list, i have managed to build a custom mach_kernel from the 10.3/7.0 sources at apple.com. i even managed to tell openfirmware to boot it, but during the boot process it complains about not being able to load extensions: apart from that, the system starts up just fine. however, i cannot use the powerbooks trackpad or keyboard to login [i think the missing ApplePMU extension is responsible for that], and the machine does not reply to pings. usb mice work fine, though. so, my question is: how do i build a kernel with support for the powerbooks hardware? or rather, where do i get the sources for the ApplePMU extension? and how do i install the extensions so that they can coexist with the already installed extensions of the same name? i am using a 667 MHz powerbook G4. thnx/ cheers, /folkert This .sig -and all of the above- is false. _______________________________________________ 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.… Jan 1 01:00:09 localhost kernel: kld(): Undefined symbols: Jan 1 01:00:09 localhost kernel: __ZN14IOPMrootDomain27registerPMSettingControllerEPFiiiPvES0_ Jan 1 01:00:09 localhost kernel: kld_load_from_memory() failed for module com.apple.driver.ApplePMU Jan 1 01:00:09 localhost kernel: [33mFailed to load extension com.apple.driver.ApplePMU. ... Jan 1 01:00:16 localhost kextd[97]: kld_load_from_memory() failed for module /System/Library/Extensions/IONetworkingFamily.kext/Contents/MacOS/ IONetworkingFamily Jan 1 01:00:16 localhost kextd[97]: a link/load error occured for kernel extension /System/Library/Extensions/IOFireWireIP.kext Jan 1 01:00:17 localhost kernel: AppleRS232Serial: 0 0 AppleRS232Serial::start - returning false early, Connector or machine incorrect Jan 1 01:00:17 localhost kextd[99]: kld_load_from_memory() failed for module /System/Library/Extensions/IONetworkingFamily.kext/Contents/MacOS/ IONetworkingFamily Jan 1 01:00:17 localhost kextd[99]: a link/load error occured for kernel extension /System/Library/Extensions/IONetworkingFamily.kext/Contents/PlugIns/ AppleGMACEthernet.kext Jan 1 01:00:18 localhost kextd[103]: kld_load_from_memory() failed for module /System/Library/Extensions/IONetworkingFamily.kext/Contents/MacOS/ IONetworkingFamily Jan 1 01:00:18 localhost kextd[103]: a link/load error occured for kernel extension /System/Library/Extensions/AppleAirPort.kext Jan 1 01:00:20 localhost kextd[109]: kld_load_from_memory() failed for module /System/Library/Extensions/ATIRadeon.kext/Contents/MacOS/ATIRadeon Jan 1 01:00:20 localhost kextd[109]: a link/load error occured for kernel extension /System/Library/Extensions/ATIRadeon.kext Jan 1 01:00:20 localhost kextd[111]: kld_load_from_memory() failed for module /System/Library/Extensions/IONetworkingFamily.kext/Contents/MacOS/ IONetworkingFamily Jan 1 01:00:20 localhost kextd[111]: a link/load error occured for kernel extension /System/Library/Extensions/IONetworkingFamily.kext This email sent to site_archiver(a)lists.apple.com

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execve randomly returns ENOMEM?
by Andrew Gallatin 03 Feb '05

03 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I'm trying to debug a problem with a perl script which launches many remote jobs on a cluster of computers. The script essentially forks and execs a large number of ssh (or rsh) sesssions to launch jobs. This script works fine on the other UNIX-like OSes (such as linux, solaris, freebsd, etc) that we support. However, on MacOSX, occasionally, and with no repeatable pattern, the some of the execves will fail. This happens even when the maxproc limit is well above the number of jobs being launched (eg, the exec, not the fork, is failing). The the reason for the failure is given as ENOMEM. From a ktrace snippet: 9885 perl RET fork 9931/0x26cb 9931 perl CALL getpid 9931 perl RET getpid 9931/0x26cb 9931 perl CALL sigaction(0x8,0xbffff0a0,0xbffff160) 9931 perl RET sigaction 0 9931 perl CALL execve(0xbfffec80,0x101b10,0x1008b0) 9931 perl RET execve -1 errno 12 Cannot allocate memory 9931 perl CALL sigaction(0x8,0xbffff100,0) 9931 perl RET sigaction 0 9931 perl CALL write(0x2,0x101310,0x36) 9931 perl GIO fd 2 wrote 54 bytes 9931 perl RET write 54/0x36 9931 perl CALL exit(0xc) Here is a test script to replicate the problem, which boils down to this: % cat ./ssh_forkbomb.pl #!/usr/bin/perl my $max_iters = $ARGV[0]; my $cmd = $ARGV[1]; my $i; my $pid; printf("running %d iterations of %s\n", $max_iters, $cmd); for ($i = 0; $ i < $max_iters; $i++) { $pid = fork; if ($pid == 0) { if (!exec($cmd)) { die "could not exec $cmd"; } } } printf("done\n"); The problem can be more easily seen if you inflate the number of execve syscalls by using a long, rambling path with the location of the desired executable near the end. Here's an example on a dual G5 with 2.5GB of ram running 10.3.5: % limit cputime unlimited filesize unlimited datasize unlimited stacksize 65536 kbytes coredumpsize unlimited memoryuse unlimited descriptors 1024 memorylocked unlimited maxproc 532 % echo $PATH /home/gallatin/bin:/home/gallatin/bin/powerpc-darwin:/usr/bin/X11:/usr/X11/bin:/usr/X11R6/bin:/usr/local/X/bin:/usr/openwin/bin:/usr/local/etc:/usr/local/bin:/usr/ucb:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/sbin:/usr/etc:/etc:/usr/local/games:/usr/games:/usr/local/requests/bin:/usr/local/mpich-gm/bin:/opt/mpi-gm/bin:/opt/mpich-mx/bin:/home/gallatin/lanaitools/powerpc_darwin/bin:/opt/gm/bin:/opt/gm/sbin:/opt/ibmcmp/vacpp/6.0/bin % ./ssh_forkbomb.pl 500 "sleep 10" ; ps ax | grep sleep | grep -v grep | wc -l running 500 iterations of sleep 10 could not exec sleep 10 at ./ssh_forkbomb.pl line 14. could not exec sleep 10 at ./ssh_forkbomb.pl line 14. could not exec sleep 10 at ./ssh_forkbomb.pl line 14. could not exec sleep 10 at ./ssh_forkbomb.pl line 14. could not exec sleep 10 at ./ssh_forkbomb.pl line 14. could not exec sleep 10 at ./ssh_forkbomb.pl line 14. could not exec sleep 10 at ./ssh_forkbomb.pl line 14. could not exec sleep 10 at ./ssh_forkbomb.pl line 14. could not exec sleep 10 at ./ssh_forkbomb.pl line 14. could not exec sleep 10 at ./ssh_forkbomb.pl line 14. could not exec sleep 10 at ./ssh_forkbomb.pl line 14. done 489 Things generally work if you use the exact path: % ./ssh_forkbomb.pl 500 "/bin/sleep 10" ; ps ax | grep sleep | grep -v grep | wc -l running 500 iterations of /bin/sleep 10 done 500 Is there any way to get an idea about what allocation in the exec path failed? I don't even know if its a per-user or per-system limit that's killing me.. Thanks, Drew _______________________________________________ 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: IOServiceOpen( ) returns kIOReturnNoMemory
by Godfrey van der Linden 03 Feb '05

03 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Godfrey On Feb 3, , at 12:37, Brian Jorgage wrote: I am not writing a user client. I have specified the "IOUserClientClass:IOUSBUserClient" key-value pair in the driver's plist. I understand that this is a default class that can be used if I choose not to write my own user client. Is this correct ? Is there something else that needs to be done in order for IOKit to "find" the IOUSBUserClient class ? _______________________________________________ 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.… I think you better go over to the usb development mailing list. They are the experts. Brian Jorgage This email sent to site_archiver(a)lists.apple.com

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Re: IOServiceOpen( ) returns kIOReturnNoMemory
by Brian Jorgage 03 Feb '05

03 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I am not writing a user client. I have specified the "IOUserClientClass:IOUSBUserClient" key-value pair in the driver's plist. I understand that this is a default class that can be used if I choose not to write my own user client. Is this correct ? Is there something else that needs to be done in order for IOKit to "find" the IOUSBUserClient class ? Brian Jorgage ----- Original Message ----- From: Godfrey van der Linden <gvdl(a)apple.com> Date: Thursday, February 3, 2005 1:02 am Subject: Re: IOServiceOpen( ) returns kIOReturnNoMemory > Have you written a user client yet. The NoMemory means that the > system > couldn't allocate the class you have defined in your drivers > plist, or > your nub which ever you are connecting too. > > Godfrey > > On Feb 2, , at 15:34, Brian Jorgage wrote: > > > I am now able to find instances of my driver via > > IOServiceGetMatchingServices(). Next step is to open a connection > > using IOServiceOpen(). However return code is > kIOReturnNoMemory. I > > have scanned http://developer.apple.com on this but haven't > found an > > explanation/correction for this. > > _______________________________________________ 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: Darwin kernel
by Godfrey van der Linden 03 Feb '05

03 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Godfrey On Feb 3, , at 6:20, Imran wrote: Hi Folks, _______________________________________________ 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.… Depends on what you want to do with the space. If you want to use it as a buffer that can be used on hardware then the easiest thing is to use IOBufferMemoryDescriptor. I am new to Mach kernel programming and want to allocate some space in memory in my kext which is a sample filter driver. Can anybody tell me the API to do the same? I have gone through the IOMemoryDescriptor but not getting which API and how should i use that. This email sent to site_archiver(a)lists.apple.com

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Darwin kernel
by Imran 03 Feb '05

03 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcUJ+3aQWw8nzTs6SemR40b4eNJnVw== Hi Folks, I am new to Mach kernel programming and want to allocate some space in memory in my kext which is a sample filter driver. Can anybody tell me the API to do the same? I have gone through the IOMemoryDescriptor but not getting which API and how should i use that. Thanks and Regards, Imran _______________________________________________ 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: IOServiceOpen( ) returns kIOReturnNoMemory
by Godfrey van der Linden 03 Feb '05

03 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Godfrey On Feb 2, , at 15:34, Brian Jorgage wrote: I am now able to find instances of my driver via IOServiceGetMatchingServices(). Next step is to open a connection using IOServiceOpen(). However return code is kIOReturnNoMemory. I have scanned http://developer.apple.com on this but haven't found an explanation/correction for this. _______________________________________________ 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.… Have you written a user client yet. The NoMemory means that the system couldn't allocate the class you have defined in your drivers plist, or your nub which ever you are connecting too. This email sent to site_archiver(a)lists.apple.com

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IOServiceOpen( ) returns kIOReturnNoMemory
by Brian Jorgage 02 Feb '05

02 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I am now able to find instances of my driver via IOServiceGetMatchingServices(). Next step is to open a connection using IOServiceOpen(). However return code is kIOReturnNoMemory. I have scanned http://developer.apple.com on this but haven't found an explanation/correction for this. Can anyone help me w/this ? Thanks, Brian Jorgage _______________________________________________ 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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Sample code for read/write from userspace to kernelspace
by Yogesh P 02 Feb '05

02 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi folks, I had write the filter scheme driver.And i want to implement read/write calls in my user space application.These calls will go to the driver through userclient. Is there any sample code for read/write so that i can read the kernel buffer in my user space buffer and write the data in the userspace buffer to kernel space buffer. Thanks in advance, Yogesh Pahilwan _______________________________________________ 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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