May 2005 - Darwin-dev - lists.apple.com

configd question
by Heath Volmer 31 May '05

31 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hello Thanks, Heath Volmer _______________________________________________ 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've been having a strange problem with configd and I was directed here from another list with my question/problem. My machine is 1.8 G5 (single), 10.4.1. configd keeps going into state "Us" when viewed with ps -aux. This is a regular occurrence: happens at least once a day, but usually more when it's being used. It does not appear to ever get out of this state by itself and a restart is required. KILL doesn't work and configd ignores -HUP. This manifests itself by erratic sleep-related behavior (won't sleep, won't wake up, can't mount external drives, ignores certain preference changes) and if left in that state for a long time other crazy things start happening: When typing the insertion point will jump all over the place in a document, problems with iMovie, weird stuff. I've been through every level of troubleshooting: PRAM and permissions; clean installs; removing/checking RAM; replacing video cards, motherboards and eventually the entire machine. Name it, it has been covered. The problem existed on 10.3 and now on 10.4. It has been there since day one on both machines. I've been directed to use configd -dv, but that doesn't seem to produce much output on 10.4. Others have said sudo sample configd 10 10. I don't know what to do with that. My Apple Store has "escalated" this but I'm going to keep at it on my own. Any ideas on what I might be able to do? This is really bizarre and I'm not the only one with these issues. This email sent to site_archiver(a)lists.apple.com

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Re: bless command and target mode
by Giuliano Gavazzi 31 May '05

31 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 31 May 2005, at 19:07, Stéphane Thiell wrote: Hi, Giuliano _______________________________________________ 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 encounter a little problem with a PowerBook Titanium which is mounted in target mode on a G5 system. My goal is to clone a partition of the G5 to the Titanium's unique partition so that it can then boot on the Titanium. The copy works but doesn't boot on the Titanium. Actually, it's quite understandable as the bless command takes the bless of the G5 bootable partition, which is probably different. After booting on a OS X Install DVD on the Titanium and setting the right boot partition, the clone works well. But before doing that — the volume is then probably correctly blessed —, even when booting with 'option' (alt), the volume doesn't appear. have you also had problems installing Tiger on a tibook? My tibook 400 would just eject the Tiger DVD when rebooting to install. The solution was to mount the tibook in target mode on a PowerMacG4 AGP and install from that on the tibook partition. Mind, it seems to me that the fan on the tibook does not activate easily and that as a result it overheats. This email sent to site_archiver(a)lists.apple.com

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Re: Bizarre out of memory bug
by Dan Bernstein 31 May '05

31 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=LWOPfhR2i3ewwPvuxwNbFCVj2/Hphq0KFE4a7JID/FZWpx8NtSqJfjtNA0tvvGgADF9lkSHhgg9ORVFml7abSRj/1SEDIxZs3QCmVfVkWFUqitK1DIWTJqmYvFblB4MrNlzGsOqG2fF+1yV3O5Ugfcq6bmyq95yChR8uatZIbqE= I just wanted to say that I've seen this problem come and go and come again, too (both with 10.3.x and 10.4.x), and I'm not the only one: <http://lists.apple.com/archives/darwin-development/2003/Jan/msg00126.html>. Unlike Tim, disabling my .tcshrc didn't help. The behavior is inconsistent in a consistent way (-: I'll get the error every time if I SSH in from a 10.4.1 box, and I'll get it the first time I SSH from a PC (using PuTTY), but then the next time I SSH from the PC, I don't get the buggy behavior. ("The first time" here is "first time after waking up the computer from sleep" which could also mean "first time with that IP address" since it gets a different one each time). -- Dan _______________________________________________ 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: bless command and target mode
by Kevin Van Vechten 31 May '05

31 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com - Kevin On May 31, 2005, at 10:07 AM, Stéphane Thiell wrote: Hi, Thanks for your help, Stéphane Thiell _______________________________________________ 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… The --setBoot argument (which used to be called --setOF) does not change the on-disk representation at all, but instead changes the boot-device open firmware variable (`nvram boot-device`). It's not possible (as far as I know) to modify an open firmware variable on a machine that is in target disk mode. Thus, I don't think your problem has any relation to the bootx.bootinfo file, but instead is due to the open firmware variable not being set on the PowerBook (until you set it via the option key and clicking the icon at boot). I encounter a little problem with a PowerBook Titanium which is mounted in target mode on a G5 system. My goal is to clone a partition of the G5 to the Titanium's unique partition so that it can then boot on the Titanium. The copy works but doesn't boot on the Titanium. Actually, it's quite understandable as the bless command takes the bless of the G5 bootable partition, which is probably different. After booting on a OS X Install DVD on the Titanium and setting the right boot partition, the clone works well. But before doing that — the volume is then probably correctly blessed —, even when booting with 'option' (alt), the volume doesn't appear. My question is, is there a way to generate a sort of generic bootx.bootinfo so that it'll be seen as a boot volume on the Titanium? or should I use a bootx.bootinfo taken on a working system of the Titanium (specific) ? This email sent to site_archiver(a)lists.apple.com

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bless command and target mode
by Stéphane Thiell 31 May '05

31 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi, Thanks for your help, Stéphane Thiell _______________________________________________ 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 encounter a little problem with a PowerBook Titanium which is mounted in target mode on a G5 system. My goal is to clone a partition of the G5 to the Titanium's unique partition so that it can then boot on the Titanium. The copy works but doesn't boot on the Titanium. Actually, it's quite understandable as the bless command takes the bless of the G5 bootable partition, which is probably different. After booting on a OS X Install DVD on the Titanium and setting the right boot partition, the clone works well. But before doing that — the volume is then probably correctly blessed —, even when booting with 'option' (alt), the volume doesn't appear. My question is, is there a way to generate a sort of generic bootx.bootinfo so that it'll be seen as a boot volume on the Titanium? or should I use a bootx.bootinfo taken on a working system of the Titanium (specific) ? This email sent to site_archiver(a)lists.apple.com

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Re: __builtin_frame_address()
by Steve Checkoway 29 May '05

29 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com I'll poke at it a bit more. _______________________________________________ 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 On May 28, 2005, at 5:56 PM, Jason Molenda wrote: Something like [...] seems to work OK for me. Maybe that can point you in the right direction. Works for me as well. I couldn't quickly produce a small test case where it fails for me. - Steve smime.p7s

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Re: setjmp/longjmp changed in Tiger
by plumber 29 May '05

29 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com /*************************************************************/ #include <stdio.h> #include <fenv.h> int main(void) { int save_rnd, rnd; double x, y, z; save_rnd = fegetround(); if (save_rnd == FE_TONEAREST) printf("rounding direction is FE_TONEAREST\n"); else printf("unexpected rounding direction\n"); x = 1.79e308; y = 2.2e-308; z = x / y; /* overflow */ printf("%g / %g = %g\n", x, y, z); x = -1.79e308; y = 2.2e-308; z = x / y; /* negative overflow */ printf("%g / %g = %g\n", x, y, z); fesetround(FE_TOWARDZERO); rnd = fegetround(); if (rnd == FE_TOWARDZERO) printf("rounding direction is FE_TOWARDZERO\n"); else printf("unexpected rounding direction\n"); x = 1.79e308; y = 2.2e-308; z = x / y; /* overflow */ printf("%g / %g = %g\n", x, y, z); fesetround(FE_UPWARD); rnd = fegetround(); if (rnd == FE_UPWARD) printf("rounding direction is FE_UPWARD\n"); else printf("unexpected rounding direction\n"); /* continued */ /*************************************************************/ /*************************************************************/ x = -1.79e308; y = 2.2e-308; z = x / y; /* negative overflow */ printf("%g / %g = %g\n", x, y, z); /* return to round-to-nearest */ fesetround(save_rnd); rnd = fegetround(); if (rnd == FE_TONEAREST) printf("rounding direction is FE_TONEAREST\n"); else printf("unexpected rounding direction\n"); } /*************************************************************/ _______________________________________________ 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: setjmp/longjmp changed in Tiger
by Matt Watson 29 May '05

29 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On May 28, 2005, at 7:47 PM, David N. Williams wrote: http://www.opengroup.org/onlinepubs/009695399/basedefs/fenv.h.html [...] matt. _______________________________________________ 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… Is the Tiger behavior a bug? If so, I'll file a bug report. Please let me know what you think. This is not a bug. longjmp() should restore the environment at the time of the setjmp() and floating-point rounding mode is part of the environment, so Tiger does this correctly. As to the "for example, floating-point status flags" part of the man page, floating-point status flags are not floating-point control modes. See the distinction here: A floating-point status flag is a system variable whose value is set (but never cleared) when a floating-point exception is raised, which occurs as a side effect of exceptional floating-point arithmetic to provide auxiliary information. A floating-point control mode is a system variable whose value may be set by the user to affect the subsequent behavior of floating-point arithmetic. This email sent to site_archiver(a)lists.apple.com

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setjmp/longjmp changed in Tiger
by David N. Williams 29 May '05

29 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Organization: University of Michigan User-agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 There's been a change in how setjmp/longjmp behaves between Panther and Tiger. In particular, the floating point rounding direction in Tiger gets restored to what it was at the time of the call to setjmp(), whereas in Panther it remains what it was at the time of the call to longjmp(). Here's a source file that demonstrates the change: ------ testsetjmp.c --------- #include <stdio.h> #include <setjmp.h> #include <fenv.h> jmp_buf mybuf; void change_round ( int round ) { fesetround ( round ); printf ("\nrounding direction changed to %i", fegetround() ); longjmp ( mybuf, 15 ); /* 15, just to see what happens */ } int main (void) { int status; printf ("\nrounding direction before setjmp is %i", fegetround() ); status = setjmp (mybuf); if ( status !=0 ) { printf ("\nstatus = %i", status); printf ( "\nrounding direction after longjmp is %i\n", fegetround() ); return 1; } change_round (FE_DOWNWARD); return 0; } ----------------------------- Here are the results on my wife's G4 Panther system (OS X 10.3.8, Xcode 1.5): ----------------------------- [euler:~/pfe] dnwills% gcc -v Reading specs from /usr/libexec/gcc/darwin/ppc/3.3/specs Thread model: posix gcc version 3.3 20030304 (Apple Computer, Inc. build 1666) [euler:~/pfe] dnwills% gcc -o testsetjmp testsetjmp.c [euler:~/pfe] dnwills% testsetjmp rounding direction before setjmp is 0 rounding direction changed to 3 status = 15 rounding direction after longjmp is 3 [euler:~/pfe] dnwills% ----------------------------- Here are the results on my G4 Tiger system (OS X 10.4.1, Xcode 2): ----------------------------- [jost:~/pfe] dnwills% gcc -v Reading specs from /usr/libexec/gcc/darwin/ppc/3.3/specs Thread model: posix gcc version 3.3 20030304 (Apple Computer, Inc. build 1809) [jost:~/pfe] dnwills% gcc -o testsetjmp testsetjmp.c [jost:~/pfe] dnwills% testsetjmp rounding direction before setjmp is 0 rounding direction changed to 3 status = 15 rounding direction after longjmp is 0 [jost:~/pfe] dnwills% ----------------------------- The Tiger results are the same with gcc 4.0.0. The Tiger behavior seems like a bug to me, but maybe I misunderstand? To quote from the Single Unix 3 spec for longjmp(): ----------------------------- SYNOPSIS #include <setjmp.h> void longjmp(jmp_buf env, int val); DESCRIPTION [CX] [Option Start] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard. [Option End] The longjmp() function shall restore the environment saved by the most recent invocation of setjmp() in the same thread, with the corresponding jmp_buf argument. If there is no such invocation, or if the function containing the invocation of setjmp() has terminated execution in the interim, or if the invocation of setjmp() was within the scope of an identifier with variably modified type and execution has left that scope in the interim, the behavior is undefined. [CX] [Option Start] It is unspecified whether longjmp() restores the signal mask, leaves the signal mask unchanged, or restores it to its value at the time setjmp() was called. [Option End] All accessible objects have values, and all other components of the abstract machine have state (for example, floating-point status flags and open files), as of the time longjmp() was called, except that the values of objects of automatic storage duration are unspecified if they meet all the following conditions: * They are local to the function containing the corresponding setjmp() invocation. * They do not have volatile-qualified type. * They are changed between the setjmp() invocation and longjmp() call. ----------------------------- I believe this says that the floating point state at the time of the longjmp() call should persist. Is the Tiger behavior a bug? If so, I'll file a bug report. Please let me know what you think. Thanks, -- David _______________________________________________ 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: __builtin_frame_address()
by Jason Molenda 29 May '05

29 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On May 25, 2005, at 7:57 PM, Steve Checkoway wrote: Something like bt () { void **fp = (void **) __builtin_frame_address (0); void *saved_pc = __builtin_return_address (0); void *saved_fp = __builtin_frame_address (1); int depth = 0; printf ("[%d] pc == %p fp == %p\n", depth++, saved_pc, saved_fp); fp = saved_fp; while (fp != NULL) { saved_fp = *fp; fp = saved_fp; if (*fp == NULL) break; saved_pc = *(fp + 2); printf ("[%d] pc == %p fp == %p\n", depth++, saved_pc, saved_fp); } } J _______________________________________________ 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… Is __builtin_frame_address() broken? I have some backtracing code that walks the stack essentially using: seems to work OK for me. Maybe that can point you in the right direction. This email sent to site_archiver(a)lists.apple.com

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