January 2007 - Darwin-kernel

Re: Getting current working directory
by Steve Checkoway 29 Jan '07

29 Jan '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Jan 28, 2007, at 10:08 PM, subodh singh wrote: In other words, do not use getwd. -- Steve Checkoway _______________________________________________ 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 You can aalso try the same by using getwd() POSIX API. According to the man page, getcwd conforms to POSIX.1 while getwd was in 4.0BSD. In addition, The getwd() function does not do sufficient error checking and is not able to return very long, but valid, paths. It is provided for compati- bility. smime.p7s

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Re: Getting current working directory
by subodh singh 29 Jan '07

29 Jan '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com 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=rdhJo7RiqydPNxZRejGi5imO579whZ2RfdEWunrRgMHwvb2DAXmwJtPIV0kjNE9uqBd2x74Oc8Z0dzWqRIw9BHBgPX7WqSFVxEwyesmZEeQMsS+x66k0heQ5k3ICiLJOT1BHEVjh1yRl9fNzVQV3MqJSqcdvyxLwh6nm+wG8oSI= Hello, You can aalso try the same by using getwd() POSIX API. Thanks Subodh Tony Scaminaci wrote: > I'm trying to programatically get and save the current working directory > using a low-level system call. You want getcwd(): "The getcwd() function copies the absolute pathname of the current working directory into the memory referenced by buf and returns a pointer to buf. The size argument is the size, in bytes, of the array referenced by buf." More complete documentation available, of course, in the getcwd(3) manpage. --nat _______________________________________________ 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/subodh79%40gmail.com This email sent to subodh79(a)gmail.com _______________________________________________ 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 1/28/07, Nat Lanza <nlanza(a)premodern.org> wrote: This email sent to site_archiver(a)lists.apple.com

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Re: Getting current working directory
by Nat Lanza 28 Jan '07

28 Jan '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Thunderbird 2.0b2 (Macintosh/20070116) You want getcwd(): More complete documentation available, of course, in the getcwd(3) manpage. --nat _______________________________________________ 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.… Tony Scaminaci wrote: I'm trying to programatically get and save the current working directory using a low-level system call. "The getcwd() function copies the absolute pathname of the current working directory into the memory referenced by buf and returns a pointer to buf. The size argument is the size, in bytes, of the array referenced by buf." This email sent to site_archiver(a)lists.apple.com

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Getting current working directory
by Tony Scaminaci 28 Jan '07

28 Jan '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=sbcglobal.net; h=Received:X-YMail-OSG:Mime-Version:Content-Type:Message-Id:Cc:Content-Transfer-Encoding:From:Subject:Date:To:X-Mailer; b=IEecZzKuebZAsDnIQRtittHV4h4kkOjK6ULkkTGRdqsxgXs4HOx6X8ENNr30srchvvpTR6FvaQ3B9LwB0jsfeGS6oZj6AnY1tFPkjysPoYrZ/hp7Ieo4z1fwUZU7JMUvG6FG85LTaUiVr/QzEKt0L2fkbxX7QIPQ06I89mvYUro= ; Hi, Thanks, Tony _______________________________________________ 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'm trying to programatically get and save the current working directory using a low-level system call. They key points are that I need to store the path string for later use and whatever system call I use must be available in single-user mode. Using a call like system ("/bin/pwd") displays the path to stdout but I can't figure out how to redirect the string to a character array for later concatenation. Since the string already exists in the PWD env variable, is there some way to read that in a C program? I'm not sure the latter is the best way though since the user's shell may be different than bash. I've been searching the online docs for hours and haven't found a way to do this yet. This email sent to site_archiver(a)lists.apple.com

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Re: crash
by William Kucharski 25 Jan '07

25 Jan '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com The kernel is panicking within lookupd's address space, but what's happening is that the kernel is taking a trap while trying to look up information for the task's working set. Bottom line, it's probably due to memory corruption, so your driver may not entirely be off the hook; rather it may have munged up memory, leaving a "time bomb" that lookupd was unfortunate enough to trip over later. William Kucharski kucharsk(a)mac.com _______________________________________________ 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: Performance counters...
by Andrew Pinski 25 Jan '07

25 Jan '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com > > Is Intel VTune going to be ported to OS X? They've already ported > their compilers. Why do you need VTune when you have Shark/CHUD???? I am sorry but Shark is the best tool ever created. -- Pinski _______________________________________________ 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: Performance counters...
by Michael Crawford 25 Jan '07

25 Jan '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=HcQ70LXu9cd0Rd/5rMwW79KbM8atYW7GzqePxgzWpyDEWp/IJpxi5oDtrPydGA47/ft4c32/5bpvpYlvOrMuUdh41pkC4SSTTngG5taYA8qIgi0L3GqWOGztk/lSmTOCXjChKXm6QsQSoPhrI2zB5HRkiDv8Sqfqd8//HfHeaBI= Is Intel VTune going to be ported to OS X? They've already ported their compilers. It's expensive, but I found it worth its weight in gold for a performance-critical Windows project I did a while back. Mike Crawford mdcrawford at gmail dot com http://www.geometricvisions.com/ _______________________________________________ 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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crash
by Andreas Fink 25 Jan '07

25 Jan '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com _______________________________________________ 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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How to spot the fix...
by Kevin Brock 24 Jan '07

24 Jan '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Date: Tue, 23 Jan 2007 10:29:37 -0800 From: Kevin Brock <apple(a)kevin.com> It sounds like mbuf_outbound_finalize won't work at all with certain packets (large pings, for example). I knew I had to do workarounds for byte order problems with the function, but I hadn't realized that it was completely broken... To work generically with 10.4.8 and previous kernels it sounds like I need to do my own implementation of mbuf_outbound_finalize(). Welcome to the club :) I had to do the same: walk the mbuf chains and do my own TCP/UDP/IPv4 header checksum computation. I was seeing the same "freeing free mbuf" panics after calling mbuf_outbound_finalize() on Intel Macs, and I noticed the same pattern: only happened when the mbuf was chained with the DLIL header in the pkthdr mbuf, and the rest of the payload split into one or more mbufs in that chain. and Yes, this was a long-standing bug that has been fixed recently along with the mbuf_outbound_finalize() byte-ordering issue. The fix should be available fairly soon. Kevin Brock apple(a)kevin.com _______________________________________________ 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 Jan 23, 2007, at 12:10 PM, Bhavesh Davda wrote: ... On Jan 23, 2007, at 10:19 AM, Adi Masputra wrote: What I'm wondering now is how we can spot the fix programmatically when it's in. Not the byte-order fix, which we've been told will be transparent, but the fix to the loop that walks the mbuf chain. Will we have to keep using our own checksum code on 10.4 systems, or will there be some way to tell when mbuf_outbound_finalize works the way it's supposed to? I'd really like to use the advertised API's rather than my own code for the checksums... This email sent to site_archiver(a)lists.apple.com

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Re: Performance counters...
by James Peach 24 Jan '07

24 Jan '07

site_archiver(a)lists.apple.com Delivered-To: Darwin-kernel(a)lists.apple.com 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=LmtEGwSmz/XLopEeJqRRbqM5ZAX8VME4SxqIaXgK5w0chi9k36R57v/PHkgBQoo3tgT1EnLnl4qdsme8BdhDGwwWOzS6rAbznoDhFAJQS9XABmBWDVPJXEQxoijzmeqkypzZ0aXaolcWFTkjnFVqzJQx4UKIgz0O7jYYbI2lSSI= Does darwin have a mechanism for monitoring various performance characteristics of an application. Windows supports a number of what they call performance counters. Applications can customize and extend this mechanism with their own custom counters. There is a monitoring application called perfmon that can track and report both system supported and custom performance counters. Performance co-pilot, oss.sgi.com/projects/pcp has been ported and does pretty much what you want. Get the 2.5.99 version from the dev directory of the download area. There is a monitoring/graphing add available from http://sourceforge.net/projects/pcpaddons/ -- James Peach | jorgar(a)gmail.com _______________________________________________ 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 24/01/07, Michael Burbidge <mburbidg(a)adobe.com> wrote: Is there anything similar in Darwin? This email sent to site_archiver(a)lists.apple.com

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