December 2008 - Darwin-kernel

Re: select() problems
by Steve Checkoway 03 Dec '08

03 Dec '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Dec 2, 2008, at 7:42 PM, Jamil Weatherbee wrote: This may be a simple one but I haven't figured it out. Something like this? #include <sys/types.h> #include <sys/select.h> #include <sys/errno.h> #include <unistd.h> #include <signal.h> #include <stdio.h> static sig_atomic_t runserver = 1; static void handler( int sig ) { runserver = 0; } int main() { struct sigaction sa; sa.sa_handler = handler; sa.sa_flags = SA_RESTART; sa.sa_mask = 0; if( sigaction(SIGINT, &sa, NULL) == -1 ) { perror( "sigaction" ); return 1; } while( runserver ) { fd_set set; struct timeval tv = { 1, 0 }; char buffer[1024]; FD_ZERO( &set ); FD_SET( 0, &set ); int ret = select( 1, &set, NULL, NULL, &tv ); if( ret == -1 ) { if( errno == EINTR ) continue; // interrupted by a signal perror( "select" ); return 1; } if( ret == 0 ) continue; // timeout ssize_t amount = read( 0, buffer, sizeof(buffer)-1 ); if( amount < 0 ) { perror( "read" ); return 1; } buffer[amount] = '\0'; fputs( buffer, stdout ); } puts( "Done!" ); return 0; } Works for me. [PBG4-3:~/temp] steve$ gcc -O3 -Wall s.c [PBG4-3:~/temp] steve$ ./a.out Testing the read. Testing the read. ^CDone! -- Steve Checkoway _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Suppose you have a server that does (in pseudo code): Now if you send a TERM signal to this process but for whatever reason there is no activity on the file descriptors. Then the process will hang into the select() until a descriptor becomes ready. You would think that the 1 second should timeout and then it should exit gracefully (which is the intent). It seems the best I can tell is that the select() call is getting restarted due to the signal but somehow it is restarted without the timeout. I didn't check if EINTR was actually being set or not, but as you can see, when I send SIGINT, it does quit. Any easy solutions? What you're describing seems like it should work. Maybe you can provide a test case that isn't working for you. This email sent to site_archiver(a)lists.apple.com

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Re: OSX 10.5 (Leopard) on a slow Dual G4
by Michael Miller 03 Dec '08

03 Dec '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(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:date:from:to :subject:cc:in-reply-to:mime-version:content-type:references; bh=h+Y2g+2QFcTVvsJzazJ+khUnaFSo4/k1JL9Lw2/aKOk=; b=xsku21cDZ6CHRFIH0XiM4HP3H+ryxELTh3QfsezFPGASTHsBepqBM2XJnQbfKmKXfH /k4d/8qZNsRcDWoWyLL+pzZPmHB4fIgPxpxEBB0cqOJGyuHCijvHjinz4PPoenYSY8e2 RWdWrO0fFNjIIDPF62S/b6Bj74SBKAfsvMKuA= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:references; b=uLdh09nH50a8DdHJIPX39OoBDA3IdQmDIiKObwKKD0yyH9RuzTPVGHLv7X2Zrz/g89 RKhmTcQDp2KjO1Dc48QAT7Cc2yfi2GhyruR6DgIFKsptRQQZvr07hYruwH/SKOkIcViX Wfow9yMhxhNypWemxqXGv89Ba+Tk6j0Btogx4= _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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OSX 10.5 (Leopard) on a slow Dual G4
by Al Ciplickas 03 Dec '08

03 Dec '08

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Re: select() problems
by mm w 03 Dec '08

03 Dec '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(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:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=dtu4OmITicahCCQ0aa4xV1HQQZ5hgScE81bRnq4Rs9k=; b=Hj23+1TcLUIeW3GCRHVFTcNrSm6iWBoGedNqmA/cFxF4Ex/0uNvtn2ZfTTuMSsKkE5 YKhekxaJFTbesH0qOfN5FDsboui1SvMpUb19ZRUliQ4ihgJpTY0pLbKvJbXTpZy2xTuF mIrwMFcf+92lqLazHsdzcMncEF+IG5//Bzjp8= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=eYVVZHowtb01E33K/batNCc9S6eQyj0hdytnj2C/6twS0yI88LbbeWw07Uy4qAjQsI pX0+VbkybUnIiKonw7EV2ypVSvymm2llj35bGyda8safDcRy23nfo2VH4ffVf9unQJ59 ckfiAHvcfiM82PG4FuduxjLGfJn3zYgmmmKek= maybe by clearing the descriptor or the timeout -> 0 On Tue, Dec 2, 2008 at 7:42 PM, Jamil Weatherbee <jamil(a)weatherbeecorporation.com> wrote: > This may be a simple one but I haven't figured it out. > > Suppose you have a server that does (in pseudo code): > > > signal_handler () > { > if TERM signal then > runserver = 0; > > } > > main () > { > > for (runserver=1;runserver;) > { > select (descriptors, timeout=1second); > > do descriptor event based stuff; > do periodic stuff; > > } > > exit gracefully; > > } > > > > > Now if you send a TERM signal to this process but for whatever reason there > is no activity on the file descriptors. Then the process will > hang into the select() until a descriptor becomes ready. You would think > that the 1 second should timeout and then it should exit gracefully (which > is the intent). > > It seems the best I can tell is that the select() call is getting restarted > due to the signal but somehow it is restarted without the timeout. > > Any easy solutions? > > -Jamil > > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-kernel/openspecies%40gmail.com > > This email sent to openspecies(a)gmail.com > -- -mmw _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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select() problems
by Jamil Weatherbee 03 Dec '08

03 Dec '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com This may be a simple one but I haven't figured it out. Suppose you have a server that does (in pseudo code): signal_handler () { if TERM signal then runserver = 0; } main () { for (runserver=1;runserver;) { select (descriptors, timeout=1second); do descriptor event based stuff; do periodic stuff; } exit gracefully; } Any easy solutions? -Jamil _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Now if you send a TERM signal to this process but for whatever reason there is no activity on the file descriptors. Then the process will hang into the select() until a descriptor becomes ready. You would think that the 1 second should timeout and then it should exit gracefully (which is the intent). It seems the best I can tell is that the select() call is getting restarted due to the signal but somehow it is restarted without the timeout. This email sent to site_archiver(a)lists.apple.com

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Re: ACL handling for NFSv4
by Terry Lambert 02 Dec '08

02 Dec '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I agree with this, but you need to be very careful here. -- Terry _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… On Nov 27, 2008, at 11:39 PM, Michael Smith wrote: On Nov 27, 2008, at 9:06 AM, Rick Macklem wrote: >From looking at kern_credential.c, all I can think of is doing kauth_cred_guid2gid() first and assuming it is a group, if it succeeds. (Which won't work if a given guid_t represents both a gid and uid.) Any suggestions on how to handle this? GUIDs are globally unique IDs; it is a directory service administration error to have a GUID that maps to more than one entity. Group first is a sensible policy; it's reasonable to expect that ACL entries will tend to indirect through role groups than directly reference users. A lot of client/server enforcement is predicated on the idea that the client and server will be members of the same security association, and being members of the same SA, you will get the same answer for both ends. In most of these cases, the enforcement is intended to be done server-side, while (potentially) being originated client-side or via inheritance. For GUID translations for unknown GUIDs, which are "unknown" because you have disconnected your laptop from the corporate network and happened to be using ACLs on it, or you have disconnected your laptop from one of maybe three SAs it's normally a member of (e.g. you are in your home office talking to your home office server(SA 1), your Internet connection is up(SA 2), but your VPN connection into work is currently down(SA 3)), then DS will make up a transient answer for you. This will boil down to you being likely to get an answer to the first question you ask in this situation, i.e. "please give me a transient GID for this GUID" or "please give me a transient UID for this GUID", but not both. Mike's right about what the default ask order should probably be in this situation, since it's the most probable mapping, and anyone who is thinking it is probably right about "I should never run my network this way in the first place". This email sent to site_archiver(a)lists.apple.com

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Re: Filter Scheme Driver, partition with diskutil, user defined partition type
by Quinn 01 Dec '08

01 Dec '08

site_archiver(a)lists.apple.com Delivered-To: Darwin-kernel(a)lists.apple.com <http://developer.apple.com/technotes/tn2006/tn2166.html> If you need a custom type just generate a GUID and use that. S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Relations, Developer Technical Support, Core OS/Hardware _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… At 14:49 +0000 1/12/08, Chris Suter wrote: You can still use Apple partition maps on Intel machines; they work fine. Don't do this except in very specific circumstances (typically when you need to do universal boot). In general, a filter scheme driver should be able to handle both APM and GPT. At 21:00 +0530 1/12/08, Sparta wrote: It accepts either alias name for the existing UUIDs or the UUID itself!!! Yes. GPT partitions don't have a string type; they only have a GUID. Various high-level tools convert common GUIDs to a string for presentation purposes, but the GUID is the fundamental data type. This email sent to site_archiver(a)lists.apple.com

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Re: Filter Scheme Driver, partition with diskutil, user defined partition type
by Sparta 01 Dec '08

01 Dec '08

site_archiver(a)lists.apple.com Delivered-To: Darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:user-agent:date:subject:from :to:cc:message-id:thread-topic:thread-index:in-reply-to:mime-version :content-type:content-transfer-encoding; bh=1ljC3MmRUmToHVMZL/uDVSkOQzrt9cprnpd4CHJTuLA=; b=yCIroSC3LsC9AulQ60VVcJsNu3ZJ26E1ig/mY4JbvBxbEhzsegFfvrth67n9zG0rJP KSrS+y3916TT1C84FL5YQjC4ni3CVgxhSOqh0S9v4hhQCtAX7KQOzD1WLcxzFkszvoK2 WYb7Lc/BjlAFIDPMVAr67ZRzoL6fg196etk5Y= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=user-agent:date:subject:from:to:cc:message-id:thread-topic :thread-index:in-reply-to:mime-version:content-type :content-transfer-encoding; b=GW4pSVw20H5+/aJWEknwijBKL4fAkqCgitc6/F1hrmXmefQID1BKhKUVvCpZi9Amj1 FIOzP8IVL+6s6+QxqVSJqfdtnI+/3g035iolesNnDJG357n86Kt1tuOFUXBraksEyoIm p2fJZbtPUPNgJ20BNrbJHXMqdUpSXtfYNTy3c= Thread-index: AclTybjBkzDjuhrroUiNag1HwFnl6Q== Thread-topic: Filter Scheme Driver, partition with diskutil, user defined partition type User-agent: Microsoft-Entourage/12.0.0.071130 Hi Chris, I tried creating a partition type of user defined name with gpt, but it does not allow me to do so. It accepts either alias name for the existing UUIDs or the UUID itself!!! I receive the following messages as per the response # gpt add -t hfs disk1 disk1s2 added # gpt add -t Apple_DTS_Filtered_HFS disk1 usage: gpt add [-b lba] [-i index] [-s lba] [-t uuid] device ... Am I passing any wrong parameter??? -- Thanks and Regards, Sparta... On 12/1/08 8:19 PM, "Chris Suter" <csuter(a)sutes.co.uk> wrote: > On Mon, Dec 1, 2008 at 2:19 PM, Sparta <theultimatespartan(a)gmail.com> wrote: > >> I am writing a driver similar as Sample Filter Scheme. >> I have gone through all the possible posts on the mailing list regarding >> this. >> In all the examples everyone has used pdisk to define the partition type of >> the disk. >> Due to the advancement in the technology we have intel machines for Mac now >> and so I can not use this command as in general. > > You can still use Apple partition maps on Intel machines; they work fine. > >> I tried gpt too, but it has a note below saying "The development of the gpt >> utility is still work in progress." > > You can use gpt. GUID partition maps use UUIDs to identify the > partitions and that's what you'll see in the Content Hint strings. You > can use gpt to create a partition for a UUID of your own choosing. > > You'll presumably want things to work on Apple Partition maps, GUID > partition maps and possibly MBR partition maps in which case you'll > need to pick appropriate identifiers for each of them. > > -- Chris _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: Filter Scheme Driver, partition with diskutil, user defined partition type
by Chris Suter 01 Dec '08

01 Dec '08

site_archiver(a)lists.apple.com Delivered-To: Darwin-kernel(a)lists.apple.com On Mon, Dec 1, 2008 at 2:19 PM, Sparta <theultimatespartan(a)gmail.com> wrote: > I am writing a driver similar as Sample Filter Scheme. > I have gone through all the possible posts on the mailing list regarding this. > In all the examples everyone has used pdisk to define the partition type of the disk. > Due to the advancement in the technology we have intel machines for Mac now and so I can not use this command as in general. You can still use Apple partition maps on Intel machines; they work fine. > I tried gpt too, but it has a note below saying "The development of the gpt utility is still work in progress." You can use gpt. GUID partition maps use UUIDs to identify the partitions and that's what you'll see in the Content Hint strings. You can use gpt to create a partition for a UUID of your own choosing. You'll presumably want things to work on Apple Partition maps, GUID partition maps and possibly MBR partition maps in which case you'll need to pick appropriate identifiers for each of them. -- Chris _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Filter Scheme Driver, partition with diskutil, user defined partition type
by Sparta 01 Dec '08

01 Dec '08

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