July 2006 - Darwin-dev - lists.apple.com

Re: Programatically determining BootROM version?
by Shantonu Sen 15 Jul '06

15 Jul '06

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RE: Re: Programatically determining BootROM version?
by David Litwin 13 Jul '06

13 Jul '06

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RE: Re: Programatically determining BootROM version?
by David Litwin 13 Jul '06

13 Jul '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thread-index: AcamqDFQ/ewx9sgtQ/umVtAPnB58qwAFmR/g Thread-topic: Re: Programatically determining BootROM version? _______________________________________________ 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: Programatically determining BootROM version?
by David Litwin 13 Jul '06

13 Jul '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thread-index: AcamqDFQ/ewx9sgtQ/umVtAPnB58qw== Thread-topic: Re: Programatically determining BootROM version? _______________________________________________ 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: How to do a blocking read from a serial device?
by Michael Smith 12 Jul '06

12 Jul '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Jul 11, 2006, at 12:04 PM, darwin-dev-request(a)lists.apple.com wrote: Read(2) will block if there is no data so there's no need to sleep. Using select(2) is one way to go about it but with only one file descriptor/socket, it seems pointless to me. Select(2) makes timeout handling (mandatory for disconnectable devices such as those attached by USB or serial interfaces) much simpler. = 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… On Jul 12, 2006, at 12:02 PM, darwin-dev-request(a)lists.apple.com wrote: On Jul 11, 2006, at 12:11 PM, Michael Smith wrote: Shouldn't that return -1 or 0? USB device removal can usually be detected and the device will typically be torn down, yes. Serial device removal is much more problematic; there is no reliable way to know that your device has been unplugged, other than that it fails to respond in the expected fashion. This email sent to site_archiver(a)lists.apple.com

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Re: Start and stop a privileged service programmatically
by Nicola Vitacolonna 12 Jul '06

12 Jul '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 10/lug/06, at 21:51, Markus Hitter wrote: Am 10.07.2006 um 19:53 schrieb Nicola Vitacolonna: Nicola _______________________________________________ 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… My initial idea was to build a preference pane to turn the connection on and off. But, for some reason, I cannot make openvpn start up correctly from code. How about toggling the OnDemand flag in your preference As far as I can understand, if OnDemand is false the service runs continuously; if it is true, the service runs when needed. If it worked, I could simply set OnDemand to true, put my .plist file in / Library/LaunchDaemons and live happily. But, so far, I was not able to make this approach effective: openvpn changes the routing tables, so it should be started at least once, I guess (I have also tried the combination OnDemand=true and RunAtLoad=true, but it is the same as OnDemand=false, i.e. openvpn starts up and runs continuously). Setting OnDemand to true simply makes openvpn (the client) never start. I have read about the Sockets key, but it is not clear to me if that may help. Maybe it would be more appropriate to toggle the Disabled flag, but when would this change take effect? On restart? The best I was able to do so far is to put a .plist file in /Library/LaunchDaemons so that openvpn is launched at startup. This email sent to site_archiver(a)lists.apple.com

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Re: Yield
by Jonas Maebe 12 Jul '06

12 Jul '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 12 jul 2006, at 13:29, Jonas Maebe wrote: Nevermind, found sched_yield() Jonas _______________________________________________ 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 there a user space function on Darwin which can be used to yield the rest of the current time slice? This email sent to site_archiver(a)lists.apple.com

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Yield
by Jonas Maebe 12 Jul '06

12 Jul '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hello, Thanks, Jonas _______________________________________________ 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 there a user space function on Darwin which can be used to yield the rest of the current time slice? This email sent to site_archiver(a)lists.apple.com

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Re: How to do a blocking read from a serial device?
by Michael Smith 12 Jul '06

12 Jul '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Jul 11, 2006, at 12:04 PM, darwin-dev-request(a)lists.apple.com wrote: Read(2) will block if there is no data so there's no need to sleep. Using select(2) is one way to go about it but with only one file descriptor/socket, it seems pointless to me. = 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… Select(2) makes timeout handling (mandatory for disconnectable devices such as those attached by USB or serial interfaces) much simpler. I note in your example that you don't test for ret == 0, which in the case of a blocking read means that if the fd is closed for some reason (e.g. the device is destroyed due to removal) you will spin forever. IMO, select with a non-blocking fd is a much cleaner way to implement this; it also has the advantage of making additions to the code over time much simpler, as it's an architectural stepping stone to a state- machine. This email sent to site_archiver(a)lists.apple.com

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Re: Global destructors called for invalid objects on Darwin x86, but nowhere else.
by Kevin Harris 12 Jul '06

12 Jul '06

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:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=HvD42LiI4PotZTs4L8p2btRR4sLgZoS4ptQwfpIzDMDmRp4fGPXRTfby1qhZzNLkMgMUgX9E5Yqgp/cf3Yd8utSUefA/e58wh9EaoPNRsss02Q2d6mKU1ziVOTbxhl8hz5F69zg1cfEpgmbYJOI+HWTUVWjweORW5+zWW63TbGc= Thank you for replying so quickly. C++ makes no guarantees as to the order that dtors are called. My guess is that the CIMOMEnvironment has some global (probably singleton) class and its dtor is being called before whatever is crashing. If this is the case, you'll need to restructure your code in such a way as to avoid this ordering dependency. The CIMOMEnvironment is a reference counted pointer. I probably should have mentioned that these globals are not referenced directly by any other global variables in any other module. The CIMOMEnvironment is accessed only through the use of a function (which would allocate the environment upon first access), so the data structure itself is not directly visible outside that particular module. > I don't believe there is a problem with the code, as this functions > properly with several compilers on many platforms and only breaks on > the x86 version of Darwin. The PPC version, with a much older xcode > and gcc3.3, seems to work fine, so it could be a gcc4 issue. The PPC > version also runs correctly with rosetta. I seem to recall reading of other issues of this nature before. I think that the x86 version calls the dtors in a different order than the ppc version of g++. That should be fine, as there isn't anything that depends on ordering of construction or destruction. This also works fine on platforms that aren't using g++ (among other platforms/compilers, HP-UX using aCC). > If anyone has any suggestions for things to check/fix, or could > actually apply their uber Mac debugging skills, I would really > appreciate it. One idea is to reference count the global object and not to destroy it until no other object is using it. Something like: We are already doing that. The environment in this case is an OpenWBEM IntrusiveReference, which is a form of reference counted thread safe smart pointer. The thing that I was finding most strange is that I put some constant globals (something as simple as a string, or anything else that has a non-trivial destructor) which are never referenced anywhere, and as long as they were contained in one of the two files that I previously mentioned, they would end up with their destructors called on what appear to be invalid objects (not due to double destructor calls either). Thank you for your suggestions. I'll appreciate any more that you (or anyone) has to offer. -Kevin- _______________________________________________ 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 7/11/06, Steve Checkoway <steve(a)cs.washington.edu> wrote: This email sent to site_archiver(a)lists.apple.com

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