November 2005 - Darwin-dev - lists.apple.com

write(2)/writev(2) atomicity?
by share-darwin＠think42.com 08 Nov '05

08 Nov '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Mutt/1.5.9i Hi All, in a multi-threaded terminal application I use writev(2) to write status messages to stderr (for testing purposes an xterm), however although the complete message is written with a single call to writev (and now I also tested write, with the same effect), and in the tested case the length of the message was well below PIPE_BUF, the output of the different threads is sometimes interleaved (always starting at 40 bytes into a message, i.e. 40 bytes of the first message, and then another message, then the rest of the first message). I am pretty sure that all standards require at least write(2) to be async-signal-safe, and to write messages smaller than PIPE_BUF atomically ... does anyone know more about this on Darwin? (Including pointers to more documentation about thread safety of the kernel and libc functions; only very few like getaddrinfo(3) seem to have notes on this subject (and in that case stating only that it is _not_ thread safe, contrary to POSIX) in their man-page.) Thanks, Colin PS: 10.4.3 on a Mac mini. _______________________________________________ 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: locale and UTF-8
by Guido Neitzer 08 Nov '05

08 Nov '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 08.11.2005, at 0:54 Uhr, Jordan K. Hubbard wrote: Okay, understood. _______________________________________________ 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 locales don't work with UTF-8 at this time. It's on our TODO list. For the record: it would be very nice to get correct international sorting (umlauts, accented characters) when UTF-8 is supported. At least an example file how to create own collate files would be very helpful as I fear that the files will be big and ugly ... ;-) Thanks for your information and your help - this helped me with a few decisions here! cug smime.p7s

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Re: 64-bit question
by Sam Hart 08 Nov '05

08 Nov '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com AgenM wrote: Linux (by default) employs the so-called Out-Of-Memory Killer (OOM Killer) which allows malloc to overcommit and effectively lie about how much memory is available for allocation. If the overcommitted pages are then written (as you do below) then a heuristic takes over in the kernel to kill (with SIGKILL) some program-- cross your fingers and hope it doesn't kill your database or long-running number- cruncher. I think FreeBSD kills the process that requests the memory, rather than one at random. Seems slightly more sane. I think it is a bug in the 32bit handling too, albeit less dramatic. The process b0rked with a bus error rather than an "Out Of Memory". for example ----------------------- cut here ----------------------- #!/bin/sh perl -le ' @foo=qw(hello) ; for (my $i ; $i<100 ; $i++) { push(@foo, @foo) || die "$i -- no more\n" ; print "$i" ; } ; print "size is $#foo" ; ' ----------------------- cut here ----------------------- which produces a result like 1 <-- snipped --> 24 perl(226) malloc: *** vm_allocate(size=8421376) failed (error code=3) perl(226) malloc: *** error: can't allocate region perl(226) malloc: *** set a breakpoint in szone_error to debug Out of memory! S a m _______________________________________________ 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… Obviously, you revealed a bug in the Darwin kernel's 64-bit handling This email sent to site_archiver(a)lists.apple.com

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Re: Source code for libSystem.B.dylib?
by Kevin Van Vechten 08 Nov '05

08 Nov '05

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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Source code for libSystem.B.dylib?
by Rob Ballantyne 08 Nov '05

08 Nov '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Mutt/1.5.6i Hi, Where can I find the source, if it's available that is, for libSystem.B.dylib? I checked the Libsystem-88.1.2 project but that, on the surface, doesn't appear to be the right stuff. Nothing else at the Darwin sources site seems to be appropriate. Any pointers? Many Thanks, Rob -- -------------------------------------------------------------------------- | Rob Ballantyne | | | email: ballanty(a)sfu.ca | _____ | | Research Manager | | | | CECM, Dept of Mathematics | -----------O----------- | | Simon Fraser University | | | Burnaby, BC, CANADA V5A 1S6 | | -------------------------------------------------------------------------- _______________________________________________ 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: locale and UTF-8
by Jordan K. Hubbard 07 Nov '05

07 Nov '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com locales don't work with UTF-8 at this time. It's on our TODO list. - Jordan On Nov 7, 2005, at 2:50 PM, Guido Neitzer wrote: Hi. Is there a way to get locales (especially LC_COLLATE) work with UFT-8? Is there any way to get it working or is this just wasted time? Thanks! cug _______________________________________________ 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/jkh%40apple.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 was successful with building my own collate files for ISO8859-1 to get sort (the one from gnu coreutils) and PostgreSQL work properly, but I failed on UTF-8. This email sent to jkh(a)apple.com This email sent to site_archiver(a)lists.apple.com

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locale and UTF-8
by Guido Neitzer 07 Nov '05

07 Nov '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi. Is there a way to get locales (especially LC_COLLATE) work with UFT-8? Is there any way to get it working or is this just wasted time? Thanks! cug _______________________________________________ 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 I was successful with building my own collate files for ISO8859-1 to get sort (the one from gnu coreutils) and PostgreSQL work properly, but I failed on UTF-8. smime.p7s

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Re: Active DHCP interfaces
by Markus Hitter 07 Nov '05

07 Nov '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Am 07.11.2005 um 22:28 schrieb matt jaffa: Markus - - - - - - - - - - - - - - - - - - - Dipl. Ing. Markus Hitter http://www.jump-ing.de/ _______________________________________________ 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 any way to find out the active interfaces using DHCP programatically? DHCP is a connection-less protocol, isn't it? Any app can send out requests at random time and/or listen to what's floating around on the subnet. If you want to learn about available servers, send out a request and look who answers. This email sent to site_archiver(a)lists.apple.com

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Active DHCP interfaces
by matt jaffa 07 Nov '05

07 Nov '05

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:mime-version:content-type; b=oBYNN6Ey+g+BZtyUQMMDh24MlYdZzXC6Wte0Qri6IWLpYatXY+Pwlhxk5h/6faZ/YNKXxsO9vS9tlPPkot7jBcecity9bXeeBK/I5fdiVqxf7AymW6q/5Ha2/KJXyLYMsibs7fNulpKmZof8kjy/9+eqKYrT6XaVc062bHXWVEI= _______________________________________________ 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: no Makefile in IOKitUser-277.6
by Finlay Dobbie 07 Nov '05

07 Nov '05

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:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=I9t0PxpzZD3d9Z0fyZ5qf1kobG0nXQjoZhu3XaFA4nhWEQuGnr/B3GlKxSQOyqqScgx7fowcPnotRn6hHavj0IL4DdyLv094hwAjr3QZ7GjV665r6tqT9l9TOS+2K6J7Kv5ZJ09cZX5ri5MGpwALxFaUlg1FfnE/fhGi7CqmqZ4= On 07/11/05, Jeff Nathan <jeff(a)snort.org> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Certainly, > > http://www.opendarwin.org/en/articles/building_xnu/ This has largely been superseded by <http://developer.apple.com/documentation/Darwin/Conceptual/KernelProgrammin…>. -- Finlay _______________________________________________ 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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