August 2005 - Darwin-kernel

Re: Linux binaries compatibility (Dave Rehring)
by David Gatwood 31 Aug '05

31 Aug '05

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Re: Linux binaries compatibility
by Andrew Gallatin 31 Aug '05

31 Aug '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Markus Hitter writes: > > and, if yes, at which cost/effort ? > > Obviously, you need an ELF linker. This linker probably should be > able to link ELF binaries to ELF libraries as well as on-the-fly > modified mach-o libraries. To get things running smoothly, a small > kernel patch would be required to make the kernel acknowledge ELF > binaries. > > Alternatively, dyld could be modified/extended to deal with ELF - > this would require small patches (add a mach-o header) to all ELF > binaries, though. ELF support is a big sticking point. As I see it there are 3 ways to support linux binaries: 1) ELF and Linux ABI support in the kernel (Like FreeBSD). It would probably take somebody knowledgable less than a month to port, but it requires changing both the syscall and exec code in the darwin kernel to make it extensible (like *BSD's). This should be very fast, and run binaries at native speeds. But I doubt Apple would accept such a patch, since they generally don't want people to be able to mess with syscalls. 2) ELF support in the kernel, linux ABI support at the level of a userspace ELF dynamic linker (like BSDI's LAP). This again requires modifying the darwin exec code to understand ELF & launch LAP when it encounters a linux ELF binary. LAP then supplies its own version of the linux libc, where all syscalls are translated to native Darwin syscalls. This might be very easy to do; the LAP was open source. But the code may be hard to find now that BSDI is gone. See http://www.usenix.org/publications/library/proceedings/usenix2000/freenix/f… This would also be very fast, and able to run binaries at native speeds. I have no idea if Apple would allow a patch to exec ELF binaries. 3) ELF support and linux ABI support via a userlevel application like lxrun which loads the ELF binary itself, and uses a signal handler to catch SEGVs when the linux binary makes syscalls. This depends on Darwin/x86 using a different syscall mechanism than linux, which I'm not sure is true. The lxrun project used to be open source, but it has been years since I've looked at it. This would be a bit slower, especially for an application which makes lots of syscalls. I think the best approach is a LAP-like one, and that's what I'd suggest to somebody starting out look into first. 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: Linux binaries compatibility
by Markus Hitter 31 Aug '05

31 Aug '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Am 31.08.2005 um 08:37 schrieb jp(a)robbe.net: 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.… Provided that both FreeBSD and Solaris support Linux binaries compatibility, thru the use of kernel modules and ELF binary support, would it be possible to implement this feature in Mac OS X on x86 platform, There are various people, including me, who wish such a functionality. The closest things I'm arware of so far are the Darwine project <http://darwine.opendarwin.org/> and Qemu <http:// fabrice.bellard.free.fr/qemu/>. and, if yes, at which cost/effort ? Obviously, you need an ELF linker. This linker probably should be able to link ELF binaries to ELF libraries as well as on-the-fly modified mach-o libraries. To get things running smoothly, a small kernel patch would be required to make the kernel acknowledge ELF binaries. Alternatively, dyld could be modified/extended to deal with ELF - this would require small patches (add a mach-o header) to all ELF binaries, though. This email sent to site_archiver(a)lists.apple.com

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Re: Linux binaries compatibility
by Dave Rehring 31 Aug '05

31 Aug '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Microsoft-Entourage/11.1.0.040913 On 8/30/05 11:37 PM, jp(a)robbe.net at jp(a)robbe.net wrote: > Hi there, > > Provided that both FreeBSD and Solaris support Linux binaries compatibility, > thru the use of kernel modules and ELF binary support, would it be possible > to implement this feature in Mac OS X on x86 platform, and, if yes, at which > cost/effort ? > > Thanks for your replies. Are you asking for people to bid on doing this for you? Of course, it is possible to implement Linux binary compatibility on MacOS X for Intel [given infinite resources and time]. It's a non-trivial task, and likely only really useful for the more technical end-user [as the applications wouldn't get to use all that Aqua goodness]. It's impossible for other people to tell you how long it would take you to do this. Later, -- David Rehring Psychos do not explode when light hits VP of Research and Development them, no matter how crazy they are... Atimi Software, Inc. www.atimi.com And totally insane guy! _______________________________________________ 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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Linux binaries compatibility
by jp＠robbe.net 31 Aug '05

31 Aug '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: IMP/PHP IMAP webmail program 2.2.2 Hi there, Provided that both FreeBSD and Solaris support Linux binaries compatibility, thru the use of kernel modules and ELF binary support, would it be possible to implement this feature in Mac OS X on x86 platform, and, if yes, at which cost/effort ? Thanks for your replies. Regards, Jean-Philippe _______________________________________________ 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: debugging on Mac OS X 10.4 (Tiger)
by Terry Lambert 31 Aug '05

31 Aug '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com At 12:00 +0530 29/8/05, Karunakar Reddy G wrote: I'd try and get a kernel core dump. <http://developer.apple.com/technotes/tn2004/tn2118.html> Serial debugging requires a real serial port; a USB dongle will not do. The recommended approach is to use two machine gdb over ethernet. -- Terry _______________________________________________ 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.… On Aug 30, 2005, at 5:37 AM, Quinn wrote: 3. I have custom usb driver on my Mac OS X 10.4 system, it is going to crash after 30 hours and no display on monitor (Like Backtrace , program counter etc..) during crash. Which is the best debugging method to adopt for this problem? If that fails, things get harder. You have to recompile the kernel with serial debugging (ddb) enabled. Of course, you'll have to run on a machine with built-in serial, which is hard to find these days. There are instructions for this (to my extreme surprise!) in the "Kernel Programming" book on our web site: <http://developer.apple.com/documentation/Darwin/Conceptual/ KernelProgramming/build/chapter_18_section_5.html#//apple_ref/doc/ uid/TP30000905-CH221-CIHDEDFH> The instructions are a little out of date. Specifically, to enable serial console support, you no longer need to change "osfmk/ppc/ serial_console.c". Rather, you can just change the PPC build configuration file "xnu/osfmk/conf/MASTER.ppc" by uncommenting the following line. #options SERIAL_CONSOLE_DEFAULT Apparently, we also ship two machine gdb-over-firewire, according to the readme in "/Developer/Extras/Kernel Debugging/", if you have the developer tools installed on your machine. This email sent to site_archiver(a)lists.apple.com

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Re: debugging on Mac OS X 10.4 (Tiger)
by Quinn 30 Aug '05

30 Aug '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I'd try and get a kernel core dump. <http://developer.apple.com/technotes/tn2004/tn2118.html> <http://developer.apple.com/documentation/Darwin/Conceptual/KernelProgrammin…> #options SERIAL_CONSOLE_DEFAULT Good luck! S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Technical Support * Networking, Communications, Hardware _______________________________________________ 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.… At 12:00 +0530 29/8/05, Karunakar Reddy G wrote: 3. I have custom usb driver on my Mac OS X 10.4 system, it is going to crash after 30 hours and no display on monitor (Like Backtrace , program counter etc..) during crash. Which is the best debugging method to adopt for this problem? If that fails, things get harder. You have to recompile the kernel with serial debugging (ddb) enabled. Of course, you'll have to run on a machine with built-in serial, which is hard to find these days. There are instructions for this (to my extreme surprise!) in the "Kernel Programming" book on our web site: The instructions are a little out of date. Specifically, to enable serial console support, you no longer need to change "osfmk/ppc/serial_console.c". Rather, you can just change the PPC build configuration file "xnu/osfmk/conf/MASTER.ppc" by uncommenting the following line. This email sent to site_archiver(a)lists.apple.com

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Re: Process ID inside a socket filter NKE
by Quinn 30 Aug '05

30 Aug '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Technical Support * Networking, Communications, Hardware [DTS is hiring support engineers. Contact me for details.] _______________________________________________ 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.… At 16:49 -0400 26/8/05, Russell Seehafer (RIT Student) wrote: If it is true, is there anyway that I can be notified or find out when a process has gone away? You can do this from user space using kqueues. See NOTE_EXIT in <sys/event.h>. I don't know of a good [1] way to do this from kernel space. [1] And by "good", I mean "supported by the Tiger sustainable kernel programming interfaces (KPIs)". Another option is to store ancillary information about the PID, and then reconfirm that information before you use your cached information. The best information to use is the process start time, but again that's only available from user space. There is KPI-accessible information that you could use, but we're starting to fall into the realm of heuristics. btw Remember that the process that opened the socket is not necessarily the same as the process that's using it. Sockets can be passed between processes using a variety of mechanisms. They can also be shared between processes (think what happens after a fork). Thus, there is no clear concept of the owning process of a socket. The best you can do is the process that created it. And even that might not be correct because a socket can be created by kernel code. This email sent to site_archiver(a)lists.apple.com

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VFS and Searching
by Brian Bergstrand 29 Aug '05

29 Aug '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Thanks. Brian Bergstrand <http://www.bergstrand.org/brian/> PGP Key ID: 0xB6C7B6A2 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (Darwin) iD8DBQFDEzf+edHYW7bHtqIRAp4BAJsG7cwPdwNGZ+Vl+9akSqmT8jGXNgCdEM1u SZDziixyR43Dh9W1aN5aJLo= =sedg -----END PGP SIGNATURE----- _______________________________________________ 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.… For some reason, the Finder is not falling back to a file name search with our volumes. Spotlight is not enabled on our volumes, and supposedly searching is supposed to fall back to simple name comparisons. With SMB volumes this is the case, however with our volume nothing at all works and 0 results are always returned. This is from the Finder (find panel or inline window search), not the spotlight menu. Is there anything we have to do at the VFS level to enable this, or is it simply a Finder bug? This email sent to site_archiver(a)lists.apple.com

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Re: debugging on Mac OS X 10.4 (Tiger)
by Lassi A.Tuura 29 Aug '05

29 Aug '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com You can try variants of these: $ sysctl hw $ system_profiler SPHardwareDataType Lassi -- Before borrowing money from a friend, decide which you need more. --Addison H. Hallock _______________________________________________ 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.… 1.Is there any way to see mem info on command line or using any tool on Mac OS X 10.4 OS. like in linux we use command cat /proc/meminfo... This email sent to site_archiver(a)lists.apple.com

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