May 2010 - Darwin-dev - lists.apple.com

Re: Problems with poll()/write() on non-blocking sockets
by Jakub Bednar 26 May '10

26 May '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thank You Eric, thank You very much!! This problem was driving me crazy for few days now. I have created a simple test case based on your suggestion and it seems I have the problem you described. I realized that poll on Mac ignores RCVLOWAT quiet some time ago but I totally didn't put it together with this issue. I know that RCVLOWAT is by default set to 1 and I somehow assumed that the same holds for SNDLOWAT. Thanks again for Your help, Jakub On May 26, 2010, at 3:41 PM, Eric Ogren wrote: > Hi Jakub - you may want to investigate the snd_lowat socket option. > The Darwin implementation of poll() ignores this option so it may > report a socket writable even when the actual write() call will fail. > setting the lowat to 1 fixed this issue for me. > > Eric > > Sent from my iPhone > > On May 26, 2010, at 9:11 AM, "Jakub Bednar" <jakub.bednar(a)avg.com> > wrote: > >> Hello everyone, >> >> during stress testing of my network application I have found some >> strange behavior of Mac OS X sockets. >> I have a communication thread, that calls a poll() checking whether >> data can be written to a non-blocking >> socket. Upon exit from this function I check for POLLERR or POLLHUP >> and then perform a write() to the socket. >> If the write returns -1 and errno is set to EINTR or EAGAIN, I go >> back to poll. Otherwise I close the socket as there >> was an error. >> >> This works great most of the time, but during stress testing I found >> out a strange behavior (e.g. after 8 hours of >> video streaming). The poll() unblocks the socket and call to write() >> returns -1 with errno EAGAIN immediately. >> I go back to poll() and the same happens again leading to busy loop. >> >> I found one post telling that it is correct for poll() to unblock a >> socket and that the socket can become non-writable >> before I manage to call write(), but this is happing all the time >> for my socket and never recovers. Should I >> consider EAGAIN to be an error and close the connection? Wouldn't >> this cause another problems? I can't see >> another way out of this issue and I don't even understand why this >> is happening. I'm not asking for nor handling >> OUT-OF-BAND data flags in poll() but I don't think it could cause >> the problem. >> >> Another thing is, that Shark's System Trace keeps telling me that >> the syscall write returned 0x0 and not -1. >> Maybe a bug in C library? >> >> Can anyone please help me out of this or explain why is this >> happening? >> >> Thanks a lot, >> >> Jakub _______________________________________________ >> 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/eogren >> %40riverbed.com >> >> This email sent to eogren(a)riverbed.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: Problems with poll()/write() on non-blocking sockets
by Eric Ogren 26 May '10

26 May '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:from:to :in-reply-to:content-type:content-transfer-encoding:x-mailer :mime-version:subject:date:references; bh=lo4QCVxsMrKYynKSYJrS2uUfZ+7Oya1ZHimQ+ttn4S8=; b=dior4TMvxDXefq3klDm6nzByv1C/FnJHJRxwqSRc4uQq6rkX6Yl+QT+Z+HSvnab3zH 00AoOwJIvNAEgRKtca+Q5azAIT978leNlq7Jwu5U0EQas2+MP61Czw0PAb7tigSDlMMP eHwgU39ib5evz5mwnG/32fs/nzDppgwP65F5g= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:from:to:in-reply-to:content-type :content-transfer-encoding:x-mailer:mime-version:subject:date :references; b=RKxhBYxDg1SVPrYWGSO+W6BM55PxTlsrGYJ/HPsxdEepg4BcYLYsUg3TfBO5D3kt44 I34tlMPVvFYWaYkUOqNK2vT7UXOy9vkZKFnl9zyLFQHuWD6sJI41vLJ3lj/B8lLegllj njnhuLxiJBF8LBZodzCH14+KEqbREtPG6Xxkc= (reforwarding to list since original bounced) Sent from my iPhone On May 26, 2010, at 9:41 AM, Eric Ogren <eogren(a)gmail.com> wrote: Eric Sent from my iPhone Hello everyone, Thanks a lot, Jakub _______________________________________________ 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/eogren%40riverbed.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… Hi Jakub - you may want to investigate the snd_lowat socket option. The Darwin implementation of poll() ignores this option so it may report a socket writable even when the actual write() call will fail. setting the lowat to 1 fixed this issue for me. On May 26, 2010, at 9:11 AM, "Jakub Bednar" <jakub.bednar(a)avg.com> wrote: during stress testing of my network application I have found some strange behavior of Mac OS X sockets. I have a communication thread, that calls a poll() checking whether data can be written to a non-blocking socket. Upon exit from this function I check for POLLERR or POLLHUP and then perform a write() to the socket. If the write returns -1 and errno is set to EINTR or EAGAIN, I go back to poll. Otherwise I close the socket as there was an error. This works great most of the time, but during stress testing I found out a strange behavior (e.g. after 8 hours of video streaming). The poll() unblocks the socket and call to write () returns -1 with errno EAGAIN immediately. I go back to poll() and the same happens again leading to busy loop. I found one post telling that it is correct for poll() to unblock a socket and that the socket can become non-writable before I manage to call write(), but this is happing all the time for my socket and never recovers. Should I consider EAGAIN to be an error and close the connection? Wouldn't this cause another problems? I can't see another way out of this issue and I don't even understand why this is happening. I'm not asking for nor handling OUT-OF-BAND data flags in poll() but I don't think it could cause the problem. Another thing is, that Shark's System Trace keeps telling me that the syscall write returned 0x0 and not -1. Maybe a bug in C library? Can anyone please help me out of this or explain why is this happening? This email sent to eogren(a)riverbed.com This email sent to site_archiver(a)lists.apple.com

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Problems with poll()/write() on non-blocking sockets
by Jakub Bednar 26 May '10

26 May '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hello everyone, during stress testing of my network application I have found some strange behavior of Mac OS X sockets. I have a communication thread, that calls a poll() checking whether data can be written to a non-blocking socket. Upon exit from this function I check for POLLERR or POLLHUP and then perform a write() to the socket. If the write returns -1 and errno is set to EINTR or EAGAIN, I go back to poll. Otherwise I close the socket as there was an error. This works great most of the time, but during stress testing I found out a strange behavior (e.g. after 8 hours of video streaming). The poll() unblocks the socket and call to write() returns -1 with errno EAGAIN immediately. I go back to poll() and the same happens again leading to busy loop. I found one post telling that it is correct for poll() to unblock a socket and that the socket can become non-writable before I manage to call write(), but this is happing all the time for my socket and never recovers. Should I consider EAGAIN to be an error and close the connection? Wouldn't this cause another problems? I can't see another way out of this issue and I don't even understand why this is happening. I'm not asking for nor handling OUT-OF-BAND data flags in poll() but I don't think it could cause the problem. Another thing is, that Shark's System Trace keeps telling me that the syscall write returned 0x0 and not -1. Maybe a bug in C library? Can anyone please help me out of this or explain why is this happening? Thanks a lot, Jakub _______________________________________________ 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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KLCacheHasValidTickets does not report the principal (Mac OS X 10.6.3)
by Nathan Herring 20 May '10

20 May '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thread-index: Acr4VOjKYHxNpl15Q0WJF0bDKC0JCw== Thread-topic: KLCacheHasValidTickets does not report the principal (Mac OS X 10.6.3) User-agent: Microsoft-Entourage/13.4.0.100208 _______________________________________________ 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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KLAcquireInitialTickets(NULL, NULL, NULL, NULL) returns klParameterErr (19276) on Mac OS X 10.6.3
by Nathan Herring 20 May '10

20 May '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thread-index: Acr4T8Lu7CbZXGp0dEyJaZRDuuFM8g== Thread-topic: KLAcquireInitialTickets(NULL, NULL, NULL, NULL) returns klParameterErr (19276) on Mac OS X 10.6.3 User-agent: Microsoft-Entourage/13.4.0.100208 _______________________________________________ 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: User idleness in Mac.
by Brian Bergstrand 19 May '10

19 May '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com >From CGEventSource.h: CG_EXTERN CFTimeInterval CGEventSourceSecondsSinceLastEventType( CGEventSourceStateID stateID, CGEventType eventType) CG_AVAILABLE_STARTING(__MAC_10_4, __IPHONE_NA); The value returned is the number of idle seconds. Unfortunately, there's no event sent, so you have to poll or roll your own event mechanism. This is more work, but can be done with a CG event tap. p.s. While the above API states 10.4, there was a bug in 10.4 that could cause system hangs if this is called, so 10.5 is really the min sys ver. On May 19, 2010, at 4:50 PM, Arnab Ganguly wrote: > How do I detect user idle in Mac OS X.Is it possible to get such event ? > Thanks, > -A > _______________________________________________ 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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User idleness in Mac.
by Arnab Ganguly 19 May '10

19 May '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:date:message-id :subject:from:to:content-type; bh=gMjM1uDjKHIqwMjC9QnfIFv3OuleluaDshQltzZ4ow0=; b=Z9I45qGUBz1oaeicek7a9A3uNKdH32vvp35esACNgS9wV3iU8ltd5m3jhZ6w2JG3gy zmOBi/wsA2rOfsa3dR2quR+/xknWnKFMco+kKBy8GEnDDYVxtI1hzJQsOesWBXXFZsBB oQjMX3a9vyG1AOmz9f7EwwYNSq3JXgxlEKYjw= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=GuU9IZrQxurGIcklb7kYDDfbXjlm5BIvzT2zqqLLh/WMEPTnnaJYoIKslDaaXGzdyI RO2x5dyirlpaH3CC2tj2nwSDGdYiD0BTLT5XSMVTjkp4Xpu6Y4/tGvKbw6HH/i/g7oeA SP44MemYhM+GQRAJkHYK3IGf1z8WftIj0NLPg= _______________________________________________ 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: libXaw3d
by Greg Parker 17 May '10

17 May '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On May 17, 2010, at 10:09 AM, John B Brown wrote: > Mac OS X 10.3.6 and XQuartz do not include a copy of libXaw3d. How do I install that library for general use? Please, no MacPorts suggestions. I've had problems from that until I've drowned in them. You'll get better answers from x11-users(a)lists.apple.com. -- Greg Parker gparker(a)apple.com Runtime Wrangler _______________________________________________ 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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libXaw3d
by John B Brown 17 May '10

17 May '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.1.7) Gecko/20100111 Thunderbird/3.0.1 Dear Folk, Shalom, John B. Brown. [jbb(a)vcn.com] 358 High Street, Buffalo, Wyoming 82834 "Freedom is not worth having if it does not include the freedom to make mistakes" Mahatma Gandhi "If any question why we died, tell them, because our fathers lied." Rudyard Kipling "A man who does not know the truth is just an idiot but a man who knows the truth and calls it a lie is a crook." Bertolt Brecht "I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it." Mark Twain _______________________________________________ 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… Mac OS X 10.3.6 and XQuartz do not include a copy of libXaw3d. How do I install that library for general use? Please, no MacPorts suggestions. I've had problems from that until I've drowned in them. In other words, how do I compile a working copy of libXaw3d in an otherwise pristine Apple environment? The only add-on I've got is XQuartz-2.5.0 sitting at /opt/X11. One other thing connected to the libXaw3d problem, how do I set the config (/cf/) environment to use imake, xmkmf, and Imakefile with Xcode and gcc-4.2? They are, after all, perfectly good BSDisms, when they are correctly configured. I'm not trying to write any Imakefiles, just compile software that uses that as the make descriptor, hence my original question about libXaw3d. This email sent to site_archiver(a)lists.apple.com

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Re: is Darwin libsasl identical to Mac OS X libsasl
by Kevin Van Vechten 17 May '10

17 May '10

site_archiver(a)lists.apple.com Delivered-To: Darwin-dev(a)lists.apple.com I believe the PasswordServer SASL plugin is not open source. Sent from my iPhone On May 16, 2010, at 2:44 PM, Thomas Bauer <tb(a)freeridecoding.com> wrote: > Dear list! > > The libsasl shipping with Mac OS X Leopard (and Snow Leopard) seems to support authentication mechanics that are not part of the official distribution of cyrus libsasl or the libsasl part of darwins passwordserver_sals project. I am a bit uncertain if I probably overlook something because libsasl is part of darwin after all and it would surprise me if just a single mechanic plugin would be missing. > The sasl mechanic i am looking for is called PPS. > > I would appreciate if someone could please let me know if that should be part of the darwin sasl or if that in fact is something private to apple. > > Thank you very much. > > Thomas > > > > > _______________________________________________ > 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/kvv%40apple.com > > This email sent to kvv(a)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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