May 2011 - Darwin-dev - lists.apple.com

Re: kqueue issue in multithreaded environment
by Axel Luttgens 23 May '11

23 May '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Le 23 mai 2011 à 11:32, Leonardo Bernardini a écrit : > > Hi all, > > [...] > > Is there someone here that may explain me the design limits of kqueue as well as a way to troubleshoots this lock condition on the close() kernel function ? Hello Leonardo, Since you didn't provide many details, perhaps could this thread prove somewhat enlightening: http://lists.apple.com/archives/darwin-kernel/2010/Aug/msg00022.html (be sure to read the whole thread, as its subject has changed in the middle) HTH, Axel _______________________________________________ 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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kqueue issue in multithreaded environment
by Leonardo Bernardini 23 May '11

23 May '11

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mktime, localtime environment variables
by Steven Abner 18 May '11

18 May '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi all I was testing some data, trying a slight departure from current norms, and came across a bug??? I could use some help testing a situation for data verification. There are several but l'd like to see if any takers on this one test. The TZ string is "EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00". The time to test is time_t = 1. I come up with tm_isdst = 1 and a gmtoffset of -7200. I think from the Mac I get tm_isdst = 0 and offset of -10800. I mess with the code so much that I would appreciate an outside look. I believe its "nih" code the Mac is using.? Thanks in advance, and for looking at this mail. Steve _______________________________________________ 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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Launch Agents not working on Snow Leopard
by Vinay Jain 13 May '11

13 May '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=metadesignsolutions.com; h=Received:Message-Id:From:To:Content-Type:Content-Transfer-Encoding:Mime-Version:Subject:Date:X-Mailer:X-ACL-Warn:X-Source:X-Source-Args:X-Source-Dir; b=Iv/Yx8E3T++qZMK2WuTeGfosYJxlcPKPnnM9l1BqR+i0nZUqFW3Vky5s3Mk7iNtG5ocn6AI4aJpxr1AsqllKQ+micqOMknYyI/ZtxXhy+vtaeDkcCokkLyYugy9DE8oe; Hi... Thanks in advance.. Best Regards: Vinay Jain vinay(a)metadesignsolutions.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… I am using launchagents to run shell script at user login, but when i am placing a plist in /Library/Launchagents folder using installer it wouldn't work on Snow Leopard but on Leopard it works fine. But when i place the same plist manually copy and paste over there it start working properly. I don't know the reason but i want to done this using installer. I couldn't find any resource or sample on the web, which provides some sort of help on my above queries.It's highly appreciated if someone could share his wisdom on how I can achieve this. This email sent to site_archiver(a)lists.apple.com

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Open Source Release: iOS 4.3/4.3.2
by William Siegrist 09 May '11

09 May '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com We have released the last two projects for iOS 4.3 (WebCore and JavaScriptCore), as well as the new WebCore in 4.3.2. You can find them in the usual location: http://opensource.apple.com/ Thank you, William Siegrist Darwin Team _______________________________________________ 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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POSIX clock_gettime(), clock_settime(), and clock_getres() and time.h
by Bayard Bell 06 May '11

06 May '11

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:from:content-type:content-transfer-encoding :subject:date:message-id:to:mime-version:x-pgp-agent:x-mailer; bh=6XpGxSjp3oSubka8n17fb9k2P841tXoErf9z2ePSu9A=; b=dLWSOxAEgG6Zqe6ExKnyAa4WH3miFgo1qSx9iNxwsGlNYqW3HxCdBeiSijJSx7HLXj bTF9MKD9lKygzLznHliGqzxkAm4jZzzFJv3uTWI2EW82WjQtMYRd+elOxyfDqnLIA8x7 +kSEohwMZ+tlUatqOjRFzkFsfohL/DMvkMR9M= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:content-type:content-transfer-encoding:subject:date:message-id :to:mime-version:x-pgp-agent:x-mailer; b=HXLIzEtk6mXSmClKLgf+mCm8Tpenrmmf/03pN6ztFxbrKHusozCCxAHGTvs+LWYvAN A9sY85G9aSGsNxASoIsnGOPqql7xHj4p1HzZRiVjfq4o0RQivLcPb4y8NFSHXVjxPVYs Y530KouT5PrDnxl52ogcsvKG7ag02AFTr4KgU= -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I'm looking to port some software from Linux and have discovered that it uses the POSIX clock_gettime() function to get thread-level data on the time spent on CPU. The group of functions and macros are all from the Timer subset of POSIX.1-2003, which is optional, but become part of the C extensions definition that is mandatory in POSIX.1-2008. From what I gather, OS X has the functionality to support the following clock_ids under the POSIX definition: CLOCK_MONOTONIC CLOCK_REALTIME _POSIX_CPUTIME _POSIX_THREAD_CPUTIME All of these have microsecond resolution, and some have nanosecond resolution. The problem is largely that OS X doesn't present the functionality through POSIX interfaces, but the information necessary to roll your own can be gleaned from documentation and the open source parts of Darwin. I'm not the first person to notice this, and there appear to be a few places where people have implemented at least parts of these interfaces as wrappers. So the first question is whether anyone knows if Lion is meant to be POSIX.1-2008 compliant, such that there should be a clean way to support this on a POSIX-compliant, Apple-provided interface going forward. I don't know the history in FreeBSD, but the functions are present there now as system calls, which might be an indication that these functions will be ported as OS X is updated against FreeBSD before there's even a question of POSIX. Looking backwards: as far as porting to Leopard and Snow Leopard, can anyone recommend an existing set of wrappers for the subset of functionality previously identified? I hope I'm not rehashing previous discussions. I did some googling, and the only thing I got was references to others writing wrappers and various bits of POSIX.1 definitions, which I've attempted to summarise above. Cheers, Bayard -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.12 (Darwin) iQIcBAEBAgAGBQJNw9UHAAoJEHm5cBpJ87dokv0P/09rmOsPlUdLM5Gr//WRA1Qi 5qTDCgNpXY8qbjNjB6SWyrHdBkPod2o8yxg1kHb1tWp2vNugQRqjBpMi7gOxQR1/ t5sfpL3ePg3drJScjDWe/iQfFexJxaMgBJ1dt75ne/RQxCQHqkjv0XCssWT9EM6C X6ldMLQDRUOeexsmcoo+0F9XD2iG9Q+tJS11HtQ062/bO3tghZYPttHaNmiQCZTn iGnHL6dp2ga2m09zPsdOHMo78BcSTxejdAQgwNOwr8vsy5UHZ7Kw+CGLV3yguSf/ qZ9Kz6lrD3A99RFfbLG7ORPUZ029rJsRVDD9TKOQH4zCOkyEaO3GCB2XxETA6ANY C29VCbTvQ2/a7nFZnp9s9Uvj75aT2dODin8UorwR65dhjgj7Frb5JTj1ZCx7Kyjf FEEKxpzjRdOHmo3xGvVeR17XgdLhh7Nzl8/KmKc4YTf1xLY95EO5AyHIRhIcL56i I3qRxtJoc4H5b3PvKxejodbUC0T/Sj+nW5f2Y5TnxrXC6Oole3COMzewFPi1bDzi epOouzjxjNFqWj4/IwiSL8hriTDwK1klXmARg/NCkR/qBE+BQYnLjP556Qd0Z8v0 UbPQO8YdJ8AWYHH/zWrtNvWch4pn2Omfdo0ROxRZ2t0EJm/fn3JpdS3e4c/lNqfH yY0QQETbPWD0RFweyTlS =FWDQ -----END PGP SIGNATURE----- _______________________________________________ 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: Equivalent of openat() on osx?
by Jean-Daniel Dupas 05 May '11

05 May '11

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: Equivalent of openat() on osx?
by Stephen J. Butler 05 May '11

05 May '11

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:in-reply-to:references:date :message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=ObQcVOEkrbe5eXXPdpW25s7kpbZXP/wQFAPx9tmfxf8=; b=AWn+7fCfAM72qMvUpVbn+32zMALwHQ64cgjkf2t5x99v+8DyX954N1/W3n8EcH920c cN2Z91dANlY/3CV8dmAM80MM5UYG00V6DpAtQBak0oFFEVSWBZ++DVZLVkkeRGU5K4SL j7BRpNXzxIuzSBKmuuvn/hhTG/u9N9dxV3AIE= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=jSX/BngqGrZuHOz4z/PWgQTTbyZ/sygq97ti2i1gwvSZhS1gDQIwHIyymbChO8PhuU jLMwf9I5fpGv4ZcJs9jvgpSb2RYPUmVrKNNtToTrSZcA9SryDr/9cqgE9Hun1f9kpGyB LSx1tpzmu94OvEkK81x8kNvMN6yYeaekkgBSs= On Thu, May 5, 2011 at 2:33 AM, Tilghman Lesher <tilghman(a)meg.abyt.es> wrote: > On Thursday 05 May 2011 00:58:48 Eric Gouriou wrote: >> Use a per-thread CWD? Darwin supports them but I can't figure >> where/whether it is documented. A previous reference to this >> capability, from an apple.com address: >> <http://lists.apple.com/archives/unix-porting/2008/Mar/msg00028.html> > > The *at functions are generally considered to be the way that a per-thread > working directory is implemented. Perhaps the author misspoke or was > referring to an as-yet unreleased version of OS X (10.7 Lion, maybe?). I grepped the xnu source for 10.6.7 and there's a pthread_chdir syscall implemented. But it doesn't look like it made it any further than that to userland. I didn't to the work of making sure that open/etc take advantage of the per-thread cwd however. _______________________________________________ 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: Equivalent of openat() on osx?
by Tilghman Lesher 05 May '11

05 May '11

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=meg.abyt.es; s=google; h=domainkey-signature:from:to:subject:date:user-agent:references :in-reply-to:reply-by:x-message:mime-version:content-type :content-transfer-encoding:message-id; bh=kh4NyjbzzNnaUQ4PSSrWFvLxxRgsu5bYeTJHXFZ2ZYI=; b=X6CKA2nM+lrkhzTPG5iHymklpIB3XWhYoLS/0DpKPnTt9gwXyoa1q6umhPHaSEquJb 5+CNZJTPmwS7Qdl3XADgGNn4oH+AC8H+VDH5oRHspW6TwwQ9Y6rXJXk45bwpzIYvV0Cb XR+wMI9UEsguaLBN7+ZvXtcEF9vOrkg0Jk6wc= Domainkey-signature: a=rsa-sha1; c=nofws; d=meg.abyt.es; s=google; h=from:to:subject:date:user-agent:references:in-reply-to:reply-by :x-message:mime-version:content-type:content-transfer-encoding :message-id; b=UuwJgCofsEWbDrMO5/QpSV1QvwsmOBjItlVkEW9LgYw6bXHqL4esaSsLbD0Bed/xP6 DBXzbNhksFfbaeHlawhqlZGkatoeDaL4iZDMJHyMxw69LHYSz4SMI9+e7IGNx6+ZB+ag Z0Ntipg20zMBtFVeWWHzC/jDUImVOiTf5682M= Reply-by: Wed, 19 Jan 2011 16:20:00 -0600 User-agent: KMail/1.13.5 (Linux/2.6.32-32-server; KDE/4.4.5; x86_64; ; ) On Thursday 05 May 2011 00:58:48 Eric Gouriou wrote: > On May 3, 2011, at 9:13 AM, Anatol Pomozov wrote: > > Hi, > > > > I am porting a Linux program to macosx (target is 10.6 version) and > > the program uses openat/unlinkat/... functions. Although these > > functions are not in POSIX, they are widely used on *nixes and the > > part proposal the next POSIX. > > > > My question what is the best equivalent for the opentat() functions > > that can be used in multithreaded application. Currently I use > > something like this: > > > > > > int openat(int dirfd, const char *pathname, int flags, ...) > > { > > > > int fd; > > > > if(fchdir(dirfd) < 0) { > > > > perror("fchdir"); > > return -1; > > > > } > > > > fd = open(pathname, flags, mode); > > // chdir to the original CWD > > > > return fd; > > > > } > > > > But this is not a perfect solution - current working directory is > > shared among all threads, it means that openat() may affect other > > threads. Is there an equivalent of this implementation without > > changing the current directory? > > Use a per-thread CWD? Darwin supports them but I can't figure > where/whether it is documented. A previous reference to this > capability, from an apple.com address: > <http://lists.apple.com/archives/unix-porting/2008/Mar/msg00028.html> The *at functions are generally considered to be the way that a per-thread working directory is implemented. Perhaps the author misspoke or was referring to an as-yet unreleased version of OS X (10.7 Lion, maybe?). > However, in my opinion, the openat()/... functions are good deal more > convenient than per-thread CWDs. I'm glad to hear that they are > considered for inclusion in an upcoming revision of POSIX. Based upon how it's published on the opengroup site, it appears it's already a part of POSIX.1-2008 (Base Specifications, Issue 7). -- Tilghman _______________________________________________ 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: Equivalent of openat() on osx?
by Eric Gouriou 05 May '11

05 May '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha1; c=relaxed; d=pobox.com; h=subject :mime-version:content-type:from:in-reply-to:date :content-transfer-encoding:message-id:references:to; s=sasl; bh= tsBJzttjF9bYpgOlTJNnJ72GQiM=; b=AiI2klyOTXCIB9aMNoQc9+E+tlUlDZ6E lD7PQ0wo1yQwhDTauLUBuTpBqXFxNoTHc1C02nHHDIsvkT4qiHhduLbvQVXc7RG1 RRadJ4QIsKf4oNu7wbOiIS3vDemOTqIyHd+B3E5EQV5vTcQIzvvv5ghDRbkxVy+C +YGKVcj6Hoc= Domainkey-signature: a=rsa-sha1; c=nofws; d=pobox.com; h=subject :mime-version:content-type:from:in-reply-to:date :content-transfer-encoding:message-id:references:to; q=dns; s= sasl; b=U23NgxClhqCmMk996UlXhtb50MzzA1GoAWiikQLrJAykl2p5Lc0OiYIS QiDcpmfmlZJbKypKovDey5/RxJ3UKRg1GH8ICsJwRi5AHyHcZP6heanUd8mTGPSh PpjyujWX42ughjLmggq/34FQY0oNPy8d1JTIE391MZbQ9cxRFcM= On May 3, 2011, at 9:13 AM, Anatol Pomozov wrote: > Hi, > > I am porting a Linux program to macosx (target is 10.6 version) and > the program uses openat/unlinkat/... functions. Although these > functions are not in POSIX, they are widely used on *nixes and the > part proposal the next POSIX. > > My question what is the best equivalent for the opentat() functions > that can be used in multithreaded application. Currently I use > something like this: > > > int openat(int dirfd, const char *pathname, int flags, ...) > { > int fd; > > if(fchdir(dirfd) < 0) { > perror("fchdir"); > return -1; > } > fd = open(pathname, flags, mode); > // chdir to the original CWD > return fd; > } > > But this is not a perfect solution - current working directory is > shared among all threads, it means that openat() may affect other > threads. Is there an equivalent of this implementation without > changing the current directory? Use a per-thread CWD? Darwin supports them but I can't figure where/whether it is documented. A previous reference to this capability, from an apple.com address: <http://lists.apple.com/archives/unix-porting/2008/Mar/msg00028.html> However, in my opinion, the openat()/... functions are good deal more convenient than per-thread CWDs. I'm glad to hear that they are considered for inclusion in an upcoming revision of POSIX. Eric _______________________________________________ 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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