December 2004 - Darwin-dev - lists.apple.com

IOAudioEngine getNumSampleFramesPerBuffer weirdness
by Andrew White 24 Dec '04

24 Dec '04

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Mozilla Thunderbird 0.9 (Macintosh/20041103) In IOAudioEngine, protected: UInt32 getNumSampleFramesPerBuffer (); public: UInt32 numSampleFramesPerBuffer; I assume the former is an accessor for the latter? -- Andrew White _______________________________________________ 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… It strikes me as bizarre (backwards, even) for a public member variable to have a protected read-only accessor. What am I missing? This email sent to site_archiver(a)lists.apple.com

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Re: Packet Socketing Equivalent in OS X?
by Paul Forgey 24 Dec '04

24 Dec '04

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Does that mean this quote from the man page is in error? On Dec 23, 2004, at 5:19 PM, Jordan Hubbard wrote: You cannot write to BPF. Merry Christmas. :-) - Jordan _______________________________________________ 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/paulf%40aphrodite.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… A packet can be sent out on the network by writing to a bpf file descrip- tor. The writes are unbuffered, meaning only one packet can be processed per write. Currently, only writes to Ethernets and SLIP links are sup- ported. I also have a need to write raw IP packets (as well as read them independent of interface hardware). I'm finding that raw sockets do not behave at all as documented. Is there a resource somewhere that explains how they really work on Darwin/Mac-OS? On Dec 23, 2004, at 5:15 PM, Ness wrote: opens successfully. PLEASE tell me I can write to BPF. This email sent to paulf(a)aphrodite.com This email sent to site_archiver(a)lists.apple.com

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Re: Packet Socketing Equivalent in OS X?
by Jordan Hubbard 24 Dec '04

24 Dec '04

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com You cannot write to BPF. Merry Christmas. :-) - Jordan _______________________________________________ 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 Dec 23, 2004, at 5:15 PM, Ness wrote: opens successfully. PLEASE tell me I can write to BPF. This email sent to site_archiver(a)lists.apple.com

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Re: Packet Socketing Equivalent in OS X?
by Ness 24 Dec '04

24 Dec '04

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Mozilla Thunderbird 0.8 (Macintosh/20040913) Chris Watson wrote: man bpf Happy Holidays! Chris Watson, M.M./J.D. opsys(a)voodooland.net Bestor G. Brown #433, http://www.bgb433.org/lodge.htm Wichita, KS, USA, GLKS Great! Only problem is: I can't write data to BPF...or can I? open("/dev/bpf0",O_RDWR,0); returns an error, but open("/dev/bpf0",O_RDONLY,0); opens successfully. PLEASE tell me I can write to BPF. ness _______________________________________________ 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: Packet Socketing Equivalent in OS X?
by Chris Watson 23 Dec '04

23 Dec '04

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com man bpf Happy Holidays! Chris Watson, M.M./J.D. opsys(a)voodooland.net Bestor G. Brown #433, http://www.bgb433.org/lodge.htm Wichita, KS, USA, GLKS _______________________________________________ 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: Packet Socketing Equivalent in OS X?
by Ness 23 Dec '04

23 Dec '04

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Mozilla Thunderbird 0.8 (Macintosh/20040913) Mark Grimes wrote: On Dec 23, 2004, at 2:10 PM, Ness wrote: Hi Thanks Ness. Please search the list archives prior to posting: -- Mark Grimes MacOSX Software Developer sourcecode(a)mac.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/nessup%40cox.net This email sent to nessup(a)cox.net I've already seen that post. I'm not exactly sure what BPF is. _______________________________________________ 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'm looking for the equivalent of Linux' Packet Socketing (PF_PACKET) in OS X. Is there an alternative? If there isn't, what can I do? http://lists.apple.com/archives/darwin-development/2003/Jun/ msg00234.html This email sent to site_archiver(a)lists.apple.com

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Re: Packet Socketing Equivalent in OS X?
by Mark Grimes 23 Dec '04

23 Dec '04

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Dec 23, 2004, at 2:10 PM, Ness wrote: Hi Thanks Ness. Please search the list archives prior to posting: -- Mark Grimes MacOSX Software Developer sourcecode(a)mac.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… I'm looking for the equivalent of Linux' Packet Socketing (PF_PACKET) in OS X. Is there an alternative? If there isn't, what can I do? http://lists.apple.com/archives/darwin-development/2003/Jun/ msg00234.html This email sent to site_archiver(a)lists.apple.com

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Packet Socketing Equivalent in OS X?
by Ness 23 Dec '04

23 Dec '04

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Mozilla Thunderbird 0.8 (Macintosh/20040913) Hi Thanks Ness. _______________________________________________ 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'm looking for the equivalent of Linux' Packet Socketing (PF_PACKET) in OS X. Is there an alternative? If there isn't, what can I do? This email sent to site_archiver(a)lists.apple.com

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ftruncate and POSIX shared memory problem
by Stéphane Letz 23 Dec '04

23 Dec '04

site_archiver(a)lists.apple.com Delivered-To: Darwin-dev(a)lists.apple.com http://www.opengroup.org/onlinepubs/009695399/functions/ftruncate.html Thanks Stephane Letz _______________________________________________ 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… We are parting code from Linux that use POSIX shared memory. On OSX it seems that ftruncate only works *once* for newly created shared memory segments. But the standard says that it ftruncate should be usable in any condition : Is the OSX implementation buggy ? Will it be corrected in future versions of the system? This email sent to site_archiver(a)lists.apple.com

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gdb disassembling __pthread_getspecific (was Re: pthread impl detection)
by Jim Ingham 21 Dec '04

21 Dec '04

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Not much we can do about this... Jim On Dec 21, 2004, at 12:04 PM, darwin-dev-request(a)lists.apple.com wrote: On Dec 20, 2004, at 7:26 AM, Paolo Molaro wrote: the best implementation for the specific hardware in use. Short of copying out that code at app launch and using it, you're likely to end There is no dependency on the current location of __pthread_getspecific (pthread_getspecific is disassembled to get its address, so we don't depend on the name either). Dump of assembler code for function __pthread_getspecific: 0xffff82c0 <__pthread_getspecific+0>: nop 0xffff82c4 <__pthread_getspecific+4>: .long 0x0 0xffff82c8 <__pthread_getspecific+8>: .long 0x0 0xffff82cc <__pthread_getspecific+12>: .long 0x0 [...] I'm not sure how you got that output, but here's what I get when I debug Safari on my PowerBook running 10.3.6: 0xffff82c0 in __pthread_getspecific () (gdb) x /6i $pc 0xffff82c0 <__pthread_getspecific>: rlwinm r5,r3,2,0,29 lupus _______________________________________________ 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 think it is just that the symbol is there, but the code doesn't get loaded till the program runs. So for instance: inghji:tot-shlib-experiment/build/gdb > ./gdb ./gdb GNU gdb 2004-03-03-cvs (Mon Nov 15 19:54:46 GMT 2004) ... (top-gdb) disassemble __pthread_getspecific Dump of assembler code for function ___pthread_getspecific: 0xffff82c0 <___pthread_getspecific+0>: nop 0xffff82c4 <___pthread_getspecific+4>: .long 0x0 0xffff82c8 <___pthread_getspecific+8>: .long 0x0 0xffff82cc <___pthread_getspecific+12>: .long 0x0 0xffff82d0 <___pthread_getspecific+16>: .long 0x0 0xffff82d4 <___pthread_getspecific+20>: .long 0x0 0xffff82d8 <___pthread_getspecific+24>: .long 0x0 0xffff82dc <___pthread_getspecific+28>: .long 0x0 End of assembler dump. (top-gdb) break main Breakpoint 3 at 0x2350: file ../../gdb/src/gdb/gdb.c, line 30. (top-gdb) run Starting program: /Volumes/ThePlayground/Users/jingham/Work/gdb-sources/tot-shlib- experiment/build/gdb/gdb Reading symbols for shared libraries . done Breakpoint 3, main (argc=1, argv=0xbffff29a) at ../../gdb/src/gdb/gdb.c:30 30 memset (&args, 0, sizeof args); (top-gdb) disassemble __pthread_getspecific Dump of assembler code for function ___pthread_getspecific: 0xffff82c0 <___pthread_getspecific+0>: rlwinm r5,r3,2,0,29 0xffff82c4 <___pthread_getspecific+4>: mfspr r3,259 0xffff82c8 <___pthread_getspecific+8>: add r5,r5,r4 0xffff82cc <___pthread_getspecific+12>: lwzx r3,r3,r5 0xffff82d0 <___pthread_getspecific+16>: blr 0xffff82d4 <___pthread_getspecific+20>: .long 0x0 0xffff82d8 <___pthread_getspecific+24>: .long 0x0 0xffff82dc <___pthread_getspecific+28>: .long 0x0 End of assembler dump. On 12/20/04 Eric Albert wrote: Yes, we jit the code, so we inline the currently used code: unless the implementation changes during runtime (which I guess could be possible, but very unlikely:-) it should be safe. up with a worse implementation for various systems than the current code. And while copying out that code at app launch may seem tempting, even that is dangerous if the location of __pthread_getspecific changes in the future. [...] I used the disas command in gdb, which apparently uses another codepath to resolve symbols and their location. Using x/i works for me, too, so mistery solved (though you may want to check with the gdb people if that is the intended behaviour of disas). Thanks. This email sent to site_archiver(a)lists.apple.com

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