October 2009 - Darwin-kernel

Re: Using POSIX Named Semaphore After Fork
by Abdulla Kamar 27 Oct '09

27 Oct '09

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Re: Using POSIX Named Semaphore After Fork
by Steve Checkoway 27 Oct '09

27 Oct '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Oct 25, 2009, at 8:11 PM, Abdulla Kamar wrote: #include <stdio.h> #include <semaphore.h> #include <unistd.h> #include <sys/wait.h> int main() { sem_t *sem = sem_open( "foo", O_CREAT, 0666, 0 ); puts( "open" ); pid_t pid = fork(); int ret; if( pid == -1 ) { perror( "fork" ); return 1; } if( pid == 0) { puts( "child is posting" ); ret = sem_post( sem ); if( ret == -1 ) perror( "child sem_post" ); ret = sem_close( sem ); if( ret == -1 ) perror( "child sem_close" ); return 0; } puts( "parent is waiting" ); ret = sem_wait( sem ); if( ret == -1 ) perror( "parent sem_wait" ); else puts( "parent finished waiting" ); pid = wait( &ret ); if( pid == -1 ) perror( "waitpid" ); ret = sem_unlink( "foo" ); if( ret == -1 ) perror( "sem_unlink" ); ret = sem_close( sem ); if( ret == -1 ) perror( "parent sem_close" ); return 0; } -- Steve Checkoway "Anyone who says that the solution is to educate the users hasn't ever met an actual user." -- Bruce Schneier _______________________________________________ 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 Is it possible to use a named semaphore after a fork without reopening it in the child process? This doesn't seem to be working for me, but may be an issue with something I'm doing. I've never used named semaphores before, but the following seems to work for me. This seems like it'd be better on the darwin-dev list, though. smime.p7s

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Re: Stepping Through Apple Sources
by William Kucharski 27 Oct '09

27 Oct '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Thunderbird 2.0.0.23 (X11/20090910) I assume you've read this: <http://developer.apple.com/mac/library/documentation/Darwin/Conceptual/KEXT…> and this: <http://developer.apple.com/mac/library/documentation/Darwin/Conceptual/Kern…> notably this: <http://developer.apple.com/mac/library/documentation/Darwin/Conceptual/Kern…> William Kucharski _______________________________________________ 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: Stepping Through Apple Sources
by Duane Murphy 27 Oct '09

27 Oct '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Thanks Kevin. I've managed to do that before. That works quite well. The problem I am having is with other kext. For example a kext from IOStorageFamily. When generating symbols for my kext, I also get symbols for various members of IOStorageFamily in com.apple.ioki t.IOStorageFamily.sym. However, after loading that symbol file using add-symbol-file, I still don't know file and line numbers for those functions: (gdb) li IOBlockStorageDriver::free() No line number known for IOBlockStorageDriver::free(). However, I can still set a break point there. I have the kernel debug kit, but It's not clear what to do or how to use the .dsym files that come with it. Thanks, ...Duane On Oct 26, 2009, at 4:43 PM, Kevin Brock wrote: > Duane Murphy wrote: >> >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA256 >> >> Is there a document or other information that describes how to setup >> gdb with 2 machine debugging to also use Apple Sources? It would be >> useful in some of my debugging situations to be able to step through >> my code into Apple's sources. >> > > I was doing this while debugging some problems with a network KEXT, > and stepping through the TCP/IP stack, setting breakpoints there > etc. to figure out why a generated packet was getting rejected. > > As I recall I simply had to put the sources in the right location. > They're expected to be in > > /SourceCache/<project>/<versioned name> > So for example, the xnu sources for 10.5.7 need to be in > > /SourceCache/xnu/xnu-1228.12.14 > If they're there, and the symbols are loaded, GDB will find them... > > Since the versions are different you can have sources for every > version you need in SourceCache at the same time with no conflicts. > > I don't think I had to do anything extra to get it working. > > Kevin > ...Duane -----BEGIN PGP SIGNATURE----- Version: PGP Desktop 9.10.0 (Build 500) Charset: US-ASCII wsBVAwUBSuZUHUrg9acQ4r2CAQiAigf+Izm0QBn+T9c4R1ttZpUlPrJfB9I9n16h Mdx/Xr/hzx96tyCgwuOS3B/992v5AHIIQRlmVlZcsQCnosvqNwgHszyW/dOI8w/N I/CgRA33I7VI9dhhwcLNiByJtC3ZS5x7fUitvSg4ers6rDIJjau0OzIzkYFFCfjs 97rDlTMSOrFGL4p9xCgzJXFMhXjcByScHfZ7LtcNqIBP4Fw6MdDqGQHgUy8MXNRP TYxZE2lPGtVBhG9WbHF/HV3V1WFHMu5FOBPUTNrg9bFO1Nkg3Rxn6oIHe7ZBDHcN VEA/o9qPZRptSQaSmgLO0e6vkWaL3UqEmCUC8GbFgCHlECuxTsdDpg== =NptF -----END PGP SIGNATURE----- _______________________________________________ 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: Stepping Through Apple Sources
by Kevin Brock 26 Oct '09

26 Oct '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Thunderbird 2.0.0.23 (Macintosh/20090812) -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Is there a document or other information that describes how to setup gdb with 2 machine debugging to also use Apple Sources? It would be useful in some of my debugging situations to be able to step through my code into Apple's sources. _______________________________________________ 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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Stepping Through Apple Sources
by Duane Murphy 26 Oct '09

26 Oct '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Is there a document or other information that describes how to setup gdb with 2 machine debugging to also use Apple Sources? It would be useful in some of my debugging situations to be able to step through my code into Apple's sources. I have a kext that is a subclass of IOBlockStorageDriver. It would be most helpful to step into IOBlockStorageDriver under some circumstances to determine what I may be doing wrong in my function overrides. When I generate symbols, I always get a IOStorageFamily.sym which let's me see symbol names. How do I also match up the source files to allow me to view the sources as well? Thank you for any pointers, ...Duane ...Duane -----BEGIN PGP SIGNATURE----- Version: PGP Desktop 9.10.0 (Build 500) Charset: US-ASCII wsBVAwUBSuYXo0rg9acQ4r2CAQjyhwf+NHVLZ27h0K1NJJAzfJN4i9PcYJTs+A20 VYtVdCA5DZoJnm94J9Rwwr9Ey6DOOHYBGziYMukN+5kE7LyuaR2PS2Wsya8xijcU okCyRj+z0iDEq+lfTadYgNV1NcKbERdHm8lP/tazNDaHNQksRjZWBiRkq7C3hZoO idZxzFLSmw8oijUW4e15TvwfSa7hl95G8qBgtIhgPY+Kt40d3Xu47ogqkc5fS0OG YZFLtWhBq/rVEKvXV3WmjP3jH+F9DHN940ITkSzVKd9h5wioaUomf/ROb1oUHiOO QugLgtALNZOAp4MQvaWBsz0cPx41deAqLjy+06tPoSi36HCKsS4ygQ== =qnJZ -----END PGP SIGNATURE----- _______________________________________________ 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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Using POSIX Named Semaphore After Fork
by Abdulla Kamar 26 Oct '09

26 Oct '09

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Re: SO_PRIORITY
by Abdulla Kamar 19 Oct '09

19 Oct '09

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:mime-version:received:in-reply-to:references :from:date:message-id:subject:to:cc:content-type; bh=6SWK4SAOIFeKQ8SuiE+7Uk13uSVuv1Cfvk3NNRp9nLw=; b=VnLOEZowmtMtH/cYur8jWciBGje4MY1Ps6vyLP+hdnItE3t0nkH4sriBZ/hW1m12Vv 7CVEVu/VobpVlHaTVCpGQaKcq9okd4D+eGaMH0nsliRSn2qWjXR8k9Rre4HH3Zj2o6ky +YbM7F6SQZe2jlvmmpy0xzLKiX1wU7/AYBviM= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type; b=N4Tp0UDjwQ6YgJwK5OmlR4iCh6+AEwat9ADzc1zNNUk5wkxDPoePtJHPWJnbo9sfCy TCXCCmbiim2jxNm224mUWsIUplj4RQQN7yb9Wq1tzjeCsZecYm4q9ECLgBSDNGevYevo FMEN4LY4/HpW9OFuq+xsdWnna9rDJVu6pPjwQ= _______________________________________________ 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: SO_PRIORITY
by Quinn 19 Oct '09

19 Oct '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com No. 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 21:03 +1100 19/10/09, Abdulla Kamar wrote: Does Mac OS X support SO_PRIORITY for setsockopt? This email sent to site_archiver(a)lists.apple.com

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SO_PRIORITY
by Abdulla Kamar 19 Oct '09

19 Oct '09

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