July 2007 - Darwin-dev - lists.apple.com

RE: Problem with system()
by Norm Green 06 Jul '07

06 Jul '07

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Re: Problem with system()
by Justin C. Walker 06 Jul '07

06 Jul '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Jul 6, 2007, at 11:07 , Norm Green wrote: If I run: int rc = system("date >/usr/tmp/tmp.kPCvVa"); If fails with rc == 256 and errno == 0 and prints this to stderr: You are not having a good time with file descriptors, are you? Justin -- Justin C. Walker, Curmudgeon at Large Institute for the Absorption of Federal Funds ----------- I'm beginning to like the cut of his jibberish. ----------- _______________________________________________ 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 cannot get the system command to work from within my program and I see a strange error message printed to stdout/stderr when I try. sh: line 1: 1: Bad file descriptor To make it even more weird: if I start the process under gdb and run the code, it works perfectly! One possibility is "good garbage vs. bad garbage". The environment with gdb will be different than without (gdb and the shell both fork () and then exec() the program in question, but there will be different garbage lying around in memory, in the two cases). Make sure you actually aren't using lots of descriptors (as Terry suggested). The probability is high that it's your code, not Mac OS X, that is at fault. It's no guarantee either way, of course, but without something more concrete to go on, it will be hard to diagnose. None of your problems show up for me in simple test cases, so whatever else is going on, it's either your code causing the problem, or your code exacerbating a problem in the system that hasn't been seen before. A few random thoughts: Do you have more than one Mac OS X system to try this on? Have you replaced/added memory in the system you are using? Do the the system or console logs show anything that seems off-beat? This email sent to site_archiver(a)lists.apple.com

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Problem with system()
by Norm Green 06 Jul '07

06 Jul '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.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… This email sent to site_archiver(a)lists.apple.com

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Re: Problem while trying to Debug Kernel Panic with GDB using Two Mac's
by JanakiRam 06 Jul '07

06 Jul '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=UcgjErRwPtasqPqYK0YePJmmD+jz8aUGwfybrBYhCoVMtPGLhOKN7u4ze7t/sbztZOBXg8QIlARI6aw2USoXNqXoxPZQ4tOJZYuBmo9Z3wnHvQmBGwE6QBFDi4AzANkJmVEvRFtbThwUDM+Fz/+xwQ9DncpcTI3ZfrcXy8QCEZA= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=B/lY/BTFUFPROtSj32s3od8vAAtoNX1hPmkyQzoQ4AJFl9lTOmzQQUT+/7T26a+vk4u62+rNdF7jfLFhQFsBO032zff0bs66sgxEPLbROAN9JXSbI/qzC6EIG1afpSjOMIZZfsDHBTfRoLh+b3uzZLGfx/WDiJh5+UnAy21Lcu8= Hi, Thanks for the initial response. Here the machines configuration. Target Machiine : PowerBook G4 Deployment Machine : Intel Mac G5 OS : Mac OS X 10.4.9 I've tried by setting the boot-args to "0x14e" and also with "0x144-v" but no use. I've tried to press the Power button along with Apple/Cmd Key. Still unable to break the Target Machine Kernel Debug Mode. Will there be any problem with Two Different Architechture based Mac ( PPC & Intel ). Please help me to solve this. Thanks in Advance. -JanakiRam. _______________________________________________ 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: sysctlbyname( "hw.availcpu" ) fails
by Daniel Vollmer 06 Jul '07

06 Jul '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 29.06.2007, at 19:27, Eric Schlegel wrote: On Jun 29, 2007, at 1:33 AM, Steve Checkoway wrote: Note that I'm not the original poster, but yes there is. :) Daniel. _______________________________________________ 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… That's more time than I'd care to take on start up. I appreciate the suggestions though. I've been using Gestalt and figured I should maybe move to some newer interface. Is Gestalt failing to give you the info you need in some way? MenuMeters (which displays your CPU type as well as the number of processors — so only cosmetic in a sense) for example is terribly incorrect on Intel Macs. NXGetLocalArchInfo() always returns "Intel 80486" and Gestalt gives "i586" (Pentium) for every CPU type. I've fixed a version of MenuMeters for my personal use to use "system_profiler" for now, as I have not found a programmatic way to obtain the information (number of physical processors, not core count (as "2 x Intel Core 2 Duo" is incorrect!) as well as the cpuid string). This email sent to site_archiver(a)lists.apple.com

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Re: Problem while trying to Debug Kernel Panic with GDB using Two Mac's
by Justin Ko 06 Jul '07

06 Jul '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:reply-to:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=O8xlf2mwt2yF11TvPw33RfmqpGhCSxamlUkZSkARSN3V3kuTYFmHLyeSZMPWSoisU/PxYpDazAJr+lTAFglVgtmXbhn8WWPrjV2QJZugIkCr7DPRPTN8em/ZUhrrwaZI2MsiBGzuRYTNQzPigqAL66IrJVEHDsB6cYmyWIX8gBo= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:reply-to:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=dsY1eHyzoG2Z4H7+cDCwJ4ctMRhi+gQUGSXi9KjSjSaYenzD++85leKIrqlQG3vFoX7MALQ4jcbGf5iTamuoik0UFyRblc75BA+CN45L/ifQj+Yn2Q+tRHkiSE445zpWoGRBLndgUkXiSENAF/uzPmpOEBuLfOEtSfsobqYhNP0= Hi ALL, I've a kernel extensions which does some vnode operations , which is crashing in the middle . So googled it and found a nice article on debugging kext @ apple developer site (http://developer.apple.com/documentation/Darwin/Conceptual/KEXTConcept/KEXT…) I've setup the two mac machines and facing an issue whil following the step -- On Target Machine, Break into Kernel Debugging Mode. I've tried to press the Power button for 3 secs and tried various alternatives specified, even then my Target Machine is not breaking into Kernel Debug Mode. Are you sure you set the boot-args correctly? It only takes a momentary touch of the power button to get the machine into debug mode. If "nvram -p | grep boot-args" doesn't show it, then it wasn't set. The command you want is: sudo nvram boot-args="debug=0x144 -v" This will also enable verbose mode when you boot. If you're building a kext you probably want verbose mode enabled. _______________________________________________ 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 7/5/07, Jani P <johnyatforums(a)gmail.com> wrote: This email sent to site_archiver(a)lists.apple.com

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Re: dup2() Problem
by Terry Lambert 06 Jul '07

06 Jul '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com You need a small test case that exhibits the failure. -- Terry >but you didn't provide a version number It was in my original post: Is there something else that's needed and how do I get it? Norm -----Original Message----- From: Terry Lambert [mailto:tlambert@apple.com] Sent: Thursday, July 05, 2007 8:04 PM To: Norm Green Cc: darwin-dev(a)lists.apple.com Subject: Re: dup2() Problem You probably need to identify a cut-down test case, and then file a bug via bug reporter. There are a bazillion things it could be (for example, the number of open files you have could exceed the resource limits set on the child, for one, or you could be attempting to dup an O_EXCL fd, etc. etc.), but there's simply not enough information. -- Terry _______________________________________________ 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… That tells me it's Tiger, a couple of releases back. It should have no problem with the fd and dup2, unless you have something else in the program that's limiting you. On Jul 5, 2007, at 8:43 PM, Norm Green wrote: Darwin pandora.gemstone.com 8.9.3 Darwin Kernel Version 8.9.3: Fri Apr 27 14:50:07 PDT 2007; root:xnu-792.19.5~2/RELEASE_I386 i386 i386 You may also want to use fileno(stdout), instead of using STDOUT_FILENO -- but you didn't provide a version number or any of the other information you'd be required to submit a bug report, like a compilable test case, so I can't tell if this would be necessary or not. On Jul 5, 2007, at 7:46 PM, Norm Green wrote: > Yes. The open call is returning a positive int and stdout has not > been closed (it works fine in the parent process). Like I said, > this code is very old and has always worked correctly on other unixes. > > Norm > > > -----Original Message----- > From: Justin C. Walker [mailto:justin@mac.com] > Sent: Thursday, July 05, 2007 6:57 PM > To: darwin-dev(a)lists.apple.com list > Subject: Re: dup2() Problem > > > On Jul 5, 2007, at 18:10 , Norm Green wrote: > > > Hi, > > > > I'm having a problem on Darwin i386 using dup2() in a child > > process. This is after a fork() call but before execve() call. > > > > After the fork I do: > > > > int logfd = open(logName, O_WRONLY|O_APPEND|O_CREAT, 0644); > > dup2(logfd, STDOUT_FILENO); > > > > The open() call succeeds but the dup2() call always fails with > > errno=9, which suggests one of the args is not an open fd. I'm > > sure I'm not closing either in my code. > > I think errno == 9 suggests that one of the values is bad, not that > one of the file descriptors is closed. The man page implies that > 'newd' may be open or closed before the dup2() call. Have you really > checked the value of each argument? > > Justin > > > -- > Justin C. Walker, Curmudgeon-At-Large > Institute for the Enhancement of the Director's Income > -------- > When LuteFisk is outlawed, > Only outlaws will have LuteFisk > -------- > > > > _______________________________________________ > 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/norm.green%40gemstone.com > > This email sent to norm.green(a)gemstone.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/tlambert%40apple.com > > This email sent to tlambert(a)apple.com This email sent to site_archiver(a)lists.apple.com

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RE: dup2() Problem
by Norm Green 06 Jul '07

06 Jul '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.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… This email sent to site_archiver(a)lists.apple.com

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Re: dup2() Problem
by Terry Lambert 06 Jul '07

06 Jul '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com -- Terry Norm -----Original Message----- From: Justin C. Walker [mailto:justin@mac.com] Sent: Thursday, July 05, 2007 6:57 PM To: darwin-dev(a)lists.apple.com list Subject: Re: dup2() Problem On Jul 5, 2007, at 18:10 , Norm Green wrote: > Hi, > > I'm having a problem on Darwin i386 using dup2() in a child > process. This is after a fork() call but before execve() call. > > After the fork I do: > > int logfd = open(logName, O_WRONLY|O_APPEND|O_CREAT, 0644); > dup2(logfd, STDOUT_FILENO); > > The open() call succeeds but the dup2() call always fails with > errno=9, which suggests one of the args is not an open fd. I'm > sure I'm not closing either in my code. I think errno == 9 suggests that one of the values is bad, not that one of the file descriptors is closed. The man page implies that 'newd' may be open or closed before the dup2() call. Have you really checked the value of each argument? Justin -- Justin C. Walker, Curmudgeon-At-Large Institute for the Enhancement of the Director's Income -------- When LuteFisk is outlawed, Only outlaws will have LuteFisk -------- _______________________________________________ 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/norm.green%40gemstone.com This email sent to norm.green(a)gemstone.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/tlambert%40apple.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… You probably need to identify a cut-down test case, and then file a bug via bug reporter. You may also want to use fileno(stdout), instead of using STDOUT_FILENO -- but you didn't provide a version number or any of the other information you'd be required to submit a bug report, like a compilable test case, so I can't tell if this would be necessary or not. There are a bazillion things it could be (for example, the number of open files you have could exceed the resource limits set on the child, for one, or you could be attempting to dup an O_EXCL fd, etc. etc.), but there's simply not enough information. On Jul 5, 2007, at 7:46 PM, Norm Green wrote: Yes. The open call is returning a positive int and stdout has not been closed (it works fine in the parent process). Like I said, this code is very old and has always worked correctly on other unixes. This email sent to tlambert(a)apple.com This email sent to site_archiver(a)lists.apple.com

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RE: dup2() Problem
by Norm Green 06 Jul '07

06 Jul '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.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… This email sent to site_archiver(a)lists.apple.com

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