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

Re: Detecting Client bandwidth
by Stephane Sudre 07 Aug '07

07 Aug '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 6 août 07, at 19:18, Alan wrote: Hi guys, Stupid question: isn't it what reference movies are designed for? _______________________________________________ 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… Are there any ways to detect/estimate the bandwidth of individual clients connected to Darwin streaming server? I'm trying to implement that when a client bandwidth is of lower speed, the server will stream an inferior quality to the client etc. Can anybody help me? Thanks in advance This email sent to site_archiver(a)lists.apple.com

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Re: ppp source
by Mike Gargano 07 Aug '07

07 Aug '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hey Mo, -Mike On Aug 6, 2007, at 5:51 PM, Mo McRoberts wrote: On 3-Aug-2007, at 21:24, Mike Gargano wrote: Hi all, Either grab the current darwinbuild from: http://trac.macosforge.org/projects/darwinbuild Hopefully that will help you some. All the best, Mo. _______________________________________________ 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… Thanks, someone else from the list had actually pointed me in that direction earlier. It's just what I needed. I did have to fix some stuff (a few files were missing and a few command line arguments), but it was much easier from that point. Thanks. I think I found a bug in the pptp kernel extension. I downloaded the source for the ppp package from opensource.apple.com for 10.4.9, but I'm having a hard time compiling a new PPTP NKE. I've never built any of these packages from scratch and could use some help. I tried building the PPTP NKE target and got a slew of errors regarding missing headers. Someone from another list told me that the missing header are private and that I need to get them from the XNU kernel project. I've got that now, but when I include those headers in my search path I still have problems with missing #defs and such. Any pointers or suggestions? It's not at all obvious since the demise of OpenDarwin and the reshuffling that's followed (not least because macosforge.org hasn't been visibly updated since 2006), but you really want to be building Darwin components with darwinbuild. I don't know if it's still the case (I'm assuming it is), but darwinbuild certainly used to be the tool used by Apple themselves to build Mac OS X/Darwin components. Get it via Subversion (DON'T download the 0.7.2 release), or (if you're adverse to svn) you can get a snapshot of it from: http://sourceforge.net/project/showfiles.php? group_id=192771&package_id=240714 Once you've downloaded and extracted it, instructions are in darwinbuild/www/index.html (ignore the old opendarwin.org URLs it mentions, the current snapshot from SVN has been updated to use macosforge.org) *That said*, having just attempted to build ppp with darwinbuild whilst writing this e-mail, it failed miserably (xcodebuild bailed), but it did create a handy BuildRoot tree containing everything that ppp depends on (including the private headers that you need). This email sent to site_archiver(a)lists.apple.com

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Re: Integrating an external UPS system?
by Mike Fischer 07 Aug '07

07 Aug '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Am 07.08.2007 um 04:27 schrieb Michael Smith: On Aug 6, 2007, at 10:19 AM, darwin-dev-request(a)lists.apple.com wrote: A customer of mine makes software for a number of UPS systems. Currently this software is cross platform and is not integrated into Darwin/Mac OS X at all. I was tasked to write an Mac OS X Installer for them (to avoid the UNIX shell stuff they had on the Mac before). So far so good. I have recently become aware of the fact, that Darwin/Mac OS X seems to have built-in support for UPS systems. But I couldn't find much information on how to actually integrate a UPS with the OS. The hardware usually comes with either USB or serial interfaces. The later would generally be converted using a USB<->Serial adaptor. Mike -- Mike Fischer Softwareentwicklung, EDV-Beratung Schulung, Vertrieb Note: I read this list in digest mode! Send me a private copy for faster responses. _______________________________________________ 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… If the UPS is USB class-compliant, it's my understanding that no software support is required; MacOS will DTRT already. Sounds good. Though I need to find out out the details of what "The Right Thing" actually is. I gather their software does more than just initiate an orderly shutdown. If the software in question is providing support for UPS systems that are not class-compliant, then you will probably want to talk to DTS in order to contact the relevant Apple person directly. Thanks for this advice. I'll have to get back with my client to find out what the UPS systems they support can and can't do and what they might want in terms of extra features (after I find out the details of what the built-in stuff already does). This email sent to site_archiver(a)lists.apple.com

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Re: Integrating an external UPS system?
by Mike Fischer 07 Aug '07

07 Aug '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi Garth, Am 06.08.2007 um 21:35 schrieb Garth Cummings: Hi Mike, On Aug 5, 2007, at 1:11 PM, Mike Fischer wrote: Hi, I'm not sure this is the right place to ask but here it goes anyway: For example "man pmset" mentions UPS settings. Note: I have not done any KEXT or IOKit programming yet. Thanks. Mike Thanks! Mike -- Mike Fischer Softwareentwicklung, EDV-Beratung Schulung, Vertrieb Note: I read this list in digest mode! Send me a private copy for faster responses. _______________________________________________ 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 customer of mine makes software for a number of UPS systems. Currently this software is cross platform and is not integrated into Darwin/Mac OS X at all. I was tasked to write an Mac OS X Installer for them (to avoid the UNIX shell stuff they had on the Mac before). So far so good. I have recently become aware of the fact, that Darwin/Mac OS X seems to have built-in support for UPS systems. But I couldn't find much information on how to actually integrate a UPS with the OS. The hardware usually comes with either USB or serial interfaces. The later would generally be converted using a USB<- >Serial adaptor. I have found the reference documentation for IOUPSPlugInInterface and IOUPSPlugIn.h. But this seems rather sparse. I'd be greatful for any pointers on where to look for more information. The USB list <http://lists.apple.com/mailman/listinfo/usb> is probably a better place for these questions. Mac OS X has built-in support for UPS units that conform to the USB HID Power Device spec <http://www.usb.org/developers/hidpage/ #Power_Devices>. You don't need to provide any software for such devices. Cool, thanks for the info. I'll check back with my client to find out how they want to pursue this. They should know the precise capabilities of the UPS systems they use as well as what integration with Mac OS X makes sense for their existing software. Do you happen to know where I can find out the details of the Mac OS X side of the USB HID Power Device support or would that be a question for the usb list? It is possible to support serial UPS units as well but that requires some code. The best way to get help with this is to submit a DTS support incident. (If you're not familiar with DTS, you can read more at the URL in my email signature.) I'm a Select Developer so I know about DTS, thanks. Before using the DTS channel I wanted to find out if there was anything I could do on my side to avoid embarassing myself by asking unresearched questions ;-) This email sent to site_archiver(a)lists.apple.com

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Re: Problem with semaphore_wait & its correct usage.
by Terry Lambert 07 Aug '07

07 Aug '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com I'm writing a kext driver , using semaphore calls. My application is hanging when the semaphore_wait is executed. Obvious errors: - You're sleeping a different semaphore than you wake up Have you considered using an IOCommandQueue or IOCommandGate instead? -- 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… On Aug 6, 2007, at 8:01 PM, JanakiRam wrote: You need to read Chapter 15 of the Kernel Programming Guide: Semaphores. It's located here: <http://developer.apple.com/documentation/Darwin/Conceptual/KernelProgrammin… > - Your start/stop functions incorrectly return success when they shouldn't. - The semaphore may not be initialized - You may permit an unload while the PC for some thread is still in the KEXT (panic) <http://developer.apple.com/documentation/Darwin/Reference/KernelIOKitFramew… > This email sent to site_archiver(a)lists.apple.com

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Re: CPAN make problem on OS X 10.4
by Charles Bailey 07 Aug '07

07 Aug '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=EX81hzWbtu4cx3JiCfLDkJ9wUt/5yYItSVfEdeVgGTfPLQeAnQyCzUEEf2NrqmTsabwS8atfC0m383WB+bKsQqbJjXMw7izax1SxALrFLhmgM1xw5WmwSU78pRRe+uSkGn7DzD8e3Wg9D8nL2/byPlxrimQYnQfyBo+jo6A0tDU= 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=MYR48YiWmErMu+i4iVqVEb/dNTzGNIp2D9mq+HOIXcv0j6TmmMKuabRQZSyz12vSndMvsKLVebHg+Evn02YC8+dT90nTsIgaezRoefT0bmVDqINaQmaOTdAr2q2dbO6mgiMdfR0f6rMiZXpBjrBrFiytHpmHH886L3FwJdgVxjQ= On 8/5/07, akobuije chijioke <akobuije(a)gmail.com> wrote: > > ------------------------ > > Writing Makefile for HTML::Tagset > -- NOT OK > Running make test > Can't test without successful make That's an odd-looking progression. In order to get a (possibly) more informative error message, try this $ /usr/bin/cpan # Fire up the cpan shell cpan> look HTML::Tagset # Shell out to the HTML::Tagset build directory $ perl Makefile.PL # Generate a Makefile $ make # and use it to build the module If it fails, please send the error message(s), and we can try to figure out what's happening. -- Regards, Charles Bailey Lists: bailey _dot_ charles _at_ gmail _dot_ com Other: bailey _at_ newman _dot_ upenn _dot_ edu _______________________________________________ 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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Problem with semaphore_wait & its correct usage.
by JanakiRam 07 Aug '07

07 Aug '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:mime-version:content-type:content-transfer-encoding:content-disposition; b=k9Ul7Dl+C2LYu/1BUb4xpncYZ1Hr79c6YG5G11z4FIpzdviMOgO908E6bx4F7VFxaUx1LULePF2eGCgrPZP45MoiKNRD1s3xE9QHHdn+9BPJjLi9rKZ0Yknuy/j0h1g3Ab5oU9af/CzMScT01GiyN74pXe9EjOueUWmD3bOmyws= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=cbrBEXzD7hchYaPCQrBDkueeV+9ktdQHVXR55YvJyFMMkuO+eCgJeh2WFcQbfH/9g0sqFOjDDjVt0MefL2t+5IJwWA+tUDDNIAdThnxc+w9RPdzLH8j4oC3u/ld4n5vNcU/2Hqk+NCYzGlJp5+rKARzeGzWp6C7Hap9LQM0XMr8= Hi ALL, I'm writing a kext driver , using semaphore calls. My application is hanging when the semaphore_wait is executed.But this is not consistent. I'm fairly new to this semaphores usage in Mac. Can any one clarify my following queries. i) Is there any difference in Semaphores implementation in Mac and other Unix flavours. ii) Is there any difference in Semaphores implementation from Mac OS 10.3 to 10.4 iii) Semaphores implementation is based on processor scheduling in Mac ?. I facing weird behaviour of app in G5 where as it is running correctly in G4. iv) i know that POSIX Semaphores are available in Mac. How the user level semaphores ( such as sem_wait) is different from Kernel level ones ? v) Is the following code usage of semaphore_wait correct ? kern_return_ DeviceDriver_start (kmod_info_t * ki, void * d) { printf("DeviceDriver_start called\n"); result = semaphore_create(current_task(),&mysemaphore,SYNC_POLICY_FIXED_PRIORITY,1); return KERN_SUCCESS; } kern_return_t DeviceDriver_stop (kmod_info_t * ki, void * d) { result = semaphore_destroy(current_task(),&mysemaphore); return KERN_SUCCESS; } static int hook_function(struct vop_args *a) { semaphore_wait(&mysemaphore); // custom hook implementation semaphore_signal(s->sem); return 0; } Please help me to solve it. 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: Integrating an external UPS system?
by Michael Smith 07 Aug '07

07 Aug '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Aug 6, 2007, at 10:19 AM, darwin-dev-request(a)lists.apple.com wrote: A customer of mine makes software for a number of UPS systems. Currently this software is cross platform and is not integrated into Darwin/Mac OS X at all. I was tasked to write an Mac OS X Installer for them (to avoid the UNIX shell stuff they had on the Mac before). So far so good. I have recently become aware of the fact, that Darwin/Mac OS X seems to have built-in support for UPS systems. But I couldn't find much information on how to actually integrate a UPS with the OS. The hardware usually comes with either USB or serial interfaces. The later would generally be converted using a USB<->Serial adaptor. = Mike _______________________________________________ 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… If the UPS is USB class-compliant, it's my understanding that no software support is required; MacOS will DTRT already. If the software in question is providing support for UPS systems that are not class-compliant, then you will probably want to talk to DTS in order to contact the relevant Apple person directly. This email sent to site_archiver(a)lists.apple.com

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Re: ppp source
by Mo McRoberts 06 Aug '07

06 Aug '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 3-Aug-2007, at 21:24, Mike Gargano wrote: Hi all, Either grab the current darwinbuild from: http://trac.macosforge.org/projects/darwinbuild Hopefully that will help you some. All the best, Mo. _______________________________________________ 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 I found a bug in the pptp kernel extension. I downloaded the source for the ppp package from opensource.apple.com for 10.4.9, but I'm having a hard time compiling a new PPTP NKE. I've never built any of these packages from scratch and could use some help. I tried building the PPTP NKE target and got a slew of errors regarding missing headers. Someone from another list told me that the missing header are private and that I need to get them from the XNU kernel project. I've got that now, but when I include those headers in my search path I still have problems with missing #defs and such. Any pointers or suggestions? It's not at all obvious since the demise of OpenDarwin and the reshuffling that's followed (not least because macosforge.org hasn't been visibly updated since 2006), but you really want to be building Darwin components with darwinbuild. I don't know if it's still the case (I'm assuming it is), but darwinbuild certainly used to be the tool used by Apple themselves to build Mac OS X/Darwin components. Get it via Subversion (DON'T download the 0.7.2 release), or (if you're adverse to svn) you can get a snapshot of it from: http://sourceforge.net/project/showfiles.php? group_id=192771&package_id=240714 Once you've downloaded and extracted it, instructions are in darwinbuild/www/index.html (ignore the old opendarwin.org URLs it mentions, the current snapshot from SVN has been updated to use macosforge.org) *That said*, having just attempted to build ppp with darwinbuild whilst writing this e-mail, it failed miserably (xcodebuild bailed), but it did create a handy BuildRoot tree containing everything that ppp depends on (including the private headers that you need). This email sent to site_archiver(a)lists.apple.com

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Re: Detecting Client bandwidth
by Terry Lambert 06 Aug '07

06 Aug '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi guys, -- 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… On Aug 6, 2007, at 11:16 AM, Justin C. Walker wrote: On Aug 6, 2007, at 10:18 , Alan wrote: Are there any ways to detect/estimate the bandwidth of individual clients connected to Darwin streaming server? I'm trying to implement that when a client bandwidth is of lower speed, the server will stream an inferior quality to the client etc. Can anybody help me? As a first step, you could contact a list that deals with the streaming server. Check <http://lists.apple.com> to find them. This list deals with the Darwin OS. However, I think you will find that Josh is correct, and there are only crude instruments available to user space in most modern OSs, such as checking how full the send queue is at some (low granularity) intervals. For example, I'm pretty sure we don't maintain a weighted moving average for bandwidth delay product that would be accessible to a streaming server via via an ioctl() on a socket to see if that connection is lagging. I'm also pretty sure there's no statistic on pool retention time in the send queue (i.e. how full the socket send side is at any one time, relative to drain rate). It's not really clear if these are the figures of merit for making this type of decision, but it's where I'd start, if I were looking. If anyone on this list is looking for a PhD Thesis topic, this is in general an area that's probably pretty wide open, since most work so far has, I think, been more related to overall congestion control, rather than QOS narrowing for narrower pipes (c.f. CMUs work on TCP rate halving, window size reduction to improve server resource utilization, packet shaping and window exaggeration to ensure bandwidth sharing, etc.). PS: I think the best approach you will likely find, as the author of a streamin server, would be to put the sockets in non-blocking mode and keep a relative count of the ratio of send request size vs. bytes of data actually sent; this will give you some idea of how quickly/slowly a given client is consuming a feed, which is probably the closes you can come without research into new kernel support mechanisms. This email sent to site_archiver(a)lists.apple.com

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