September 2006 - Darwin-kernel

Re: plugin USB device doesnot loads the KEXT.Help required!
by Herb Petschauer 26 Sep '06

26 Sep '06

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Re: plugin USB device doesnot loads the KEXT.Help required!
by rohit dhamija 26 Sep '06

26 Sep '06

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Re: plugin USB device doesnot loads the KEXT.Help required!
by Fernando Urbina 26 Sep '06

26 Sep '06

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plugin USB device doesnot loads the KEXT.Help required!
by rohit dhamija 26 Sep '06

26 Sep '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(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=pQ2a0T+yZXx80UiAzWGGWX9jzOFhO577n+okCKx9KdfWWby+vGbbwlx51dQhJL1Cc4bXTuHdqn6FDteoCZMpH10UbliTofwJiXNGSNApE+kh09WKllzOnzJmSm1z6ZKzCx3b9B3dxjtrQVOQzbscpqUJHkrTxQ+DaOUGNF5PEIs= _______________________________________________ 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: File opens while executing an application
by Terry Lambert 25 Sep '06

25 Sep '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Sep 24, 2006, at 11:06 PM, Sudarshan S wrote: I am trying to understand loading sequence when an application is executed. I found that TextEdit.app opens more than 100 files whenever it is executed. Most of these files are plist, dylib and some dependent files in Frameworks. This was observed through Kauth hook. I would like to know whether these files are opened in sequence,i.e one at a time or not. If dependent files are opened in sequence, is that the reason why heavy applications like Firefox takes longer time to execute ? - - -- 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.… Yes, opening these files is a seriailization point, since there is only a single thread running at the time. Generally, no. As a percentage of time, that's not where you are burning your seconds, which you'd likely see if you'd profiled the code. More likely, it's the static initialization that's done at load time for C++ objects, instead of at link time (predone) or runtime (as needed). A very simple test that would demonstrate this is having a pre-heated cache, and seeing how much launch time differs (i.e. start it once to load the browser cache, reboot, start it again to preheat the file cache, exit it, quit out completely, waiting for the system to quiesce, and start two more times, and see what the difference is in time -- the first load and reboot is necessary to separate buffer cache effects and browser cache effects). The problem with initializers is that the C++ standard does not specify an order for calling them. The typical order on g++ based C++ compilers is in the order that the modules were linked, rather than the dependency order for the objects, based on their inheritance relationships. As a result, you will tend to see some thing sthat work well on compilers that deal with hierarchical runtime initialization (e.g. SunSoft C++, Oregon C++, IBM's xLC++, etc.) or compile time initialization (MSVC++, Borland C++, etc.) that tend to fail miserably with runtime initialization when compiled with g++-based compilers that don't fire their initializers at load time (because of link-time decisions). As an example, when Jeremy Allison and I got Qualcomm's ACAP reference implementation running under g++ 2.95 (we had to deal with implementing per-thread exceptions into libg++ to support this), when object files were linked in reverse dependency order, everything just worked, but when they were linked in the default order that came with the ACAP Makefile reference implementation, things would crash due to partially constructed static objects being used. Typically, you can significantly reduce the static initializer overhead by using a "singleton" pattern, and performing initialization of objects at runtime, rather than providing static initializers (i.e. global declarations end up as pointers to class objects/structures, rather than as instances). I don't know how far down that road, you'd want to go with the Firefox sources, of course, but if you climb that mountain, you should see start time performance wins on other platforms as well (e.g. FreeBSD, Linux, etc.), at the same time avoiding what must be carefully constructed ordering of object file names in Makefile's, which is probably fragile enough that developers stub their toes on it pretty frequently. FWIW: It'd probably be more worthwhile in the long run for someone to address supporting communicating hierarchical initialization relationships between the compiler and the linker, and either put the preinitialized objects in the BSS, or make it so runtime linking in g+ + wasn't dependent on link order. This email sent to site_archiver(a)lists.apple.com

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Re: uimove works only if null terminated string is writen
by Jeremy Pereira 25 Sep '06

25 Sep '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Sending again from the correct account so it doesn't bounce. Are you doing this on PowerPC architecture or i386? On 25 Sep 2006, at 12:57, sanjay yaragatti wrote: Hi all, I had recently posted a mail asking about the problems faced in dev_write of a character deive using uiomove.I am now able to print the data after doing the uiomove() opearation i,e print the data after copying from user space to kernel space. I have observed that uimove() api in the driver works only when u write a null terminated string from the user space application. How do i write a single character from user space application which is not null terminated?? write(device_fd, (char *)&c, 1); //doesnt work write(device_fd, str, strlen(str)); // works fine Here is the sample user space application through which i am writng to and reading from the driver. int main() { FILE *fp = NULL; int device_fd = -1; char str[50] = {0}; char file_name[40] = {0}; printf("Enter the file name\n"); scanf("%s", file_name); Here you have a potential buffer overflow exploit :-) device_fd = open(dev_name, O_RDWR); fp = fopen(file_name, "r"); if (fp == NULL) { printf("File open failed\n"); return ; } //while ((c = fgetc(fp)) != EOF) // doesnt work c is an int. i.e. 4 bytes while ((retval= fgets(str,sizeof(str),fp)) != NULL) { //ret = write(device_fd, (char *)&c, 1); // doesnt work ret = write(device_fd, str, 10); // works fine } } e.g. on a PowerPC based Mac: jeremyp@pamela:jeremyp$ cat >test_endian.c #include <stdio.h> int main () { int c = 'X' ; On an Intel based Mac the output looks like this: c = 0x00000058, *(char*)&c = 0x58, *((char*)&c + 3) = 0x00 __________________________________________________________ Yahoo! India Answers: Share what you know. Learn something new http://in.answers.yahoo.com/ _______________________________________________ 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/adc%40jeremyp.net This email sent to adc(a)jeremyp.net _______________________________________________ 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.… Here you are not writing the null character at the end of the string. strlen (str) returns the number of characters before the first null On PowerPC, (char*)&c points to the high byte of c, probably a null byte. On i386 it points to your character. printf ("c = 0x%08x, *(char*)&c = 0x%02x, *((char*)&c + 3) = 0x%02x\n", c, (int) (*(char*)&c), (int) (*((char*)&c + 3))) ; return 0 ; } jeremyp@pamela:jeremyp$ cc test_endian.c jeremyp@pamela:jeremyp$ ./a.out c = 0x00000058, *(char*)&c = 0x00, *((char*)&c + 3) = 0x58 This email sent to site_archiver(a)lists.apple.com

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uimove works only if null terminated string is writen
by sanjay yaragatti 25 Sep '06

25 Sep '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.co.in; h=Message-ID:Received:Date:From:Subject:To:Cc:MIME-Version:Content-Type:Content-Transfer-Encoding; b=kbVb/cfPl3OqIrSBdxeZyzpAK50RNzt3IvAIvWBoPSCbChOz6oVVLbEt3dX2j2bCtmFSOzGM7JJikmqhjpKPunyZ0otB2bQkCUNT0v7kEH5Y225APIlOgaRsT9rEu5UmHg0DKOW+PysM5fWk6C+MkGoVsNzIDiB+cTgfpmpY2E8= ; Hi all, I had recently posted a mail asking about the problems faced in dev_write of a character deive using uiomove.I am now able to print the data after doing the uiomove() opearation i,e print the data after copying from user space to kernel space. I have observed that uimove() api in the driver works only when u write a null terminated string from the user space application. How do i write a single character from user space application which is not null terminated?? write(device_fd, (char *)&c, 1); //doesnt work write(device_fd, str, strlen(str)); // works fine Here is the sample user space application through which i am writng to and reading from the driver. int main() { FILE *fp = NULL; int device_fd = -1; char str[50] = {0}; char file_name[40] = {0}; printf("Enter the file name\n"); scanf("%s", file_name); device_fd = open(dev_name, O_RDWR); fp = fopen(file_name, "r"); if (fp == NULL) { printf("File open failed\n"); return ; } //while ((c = fgetc(fp)) != EOF) // doesnt work while ((retval= fgets(str,sizeof(str),fp)) != NULL) { //ret = write(device_fd, (char *)&c, 1); // doesnt work ret = write(device_fd, str, 10); // works fine } } __________________________________________________________ Yahoo! India Answers: Share what you know. Learn something new http://in.answers.yahoo.com/ _______________________________________________ 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: The status of NOTE_TRACK bug in kqueue
by Quinn 25 Sep '06

25 Sep '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Just to be 100% clear, if a bug is affecting you, file it in BugReporter. <http://developer.apple.com/bugreporter/> * * * 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 14:45 +0300 23/9/06, Nikita Zhuk wrote: [...] monitoring the NOTE_TRACK event causes kernel panic as soon as the parent process fork()s any children. This bug with a simple test case has been posted to this list [1] in 2005, and based on the list archives it has been also reported via bugreporter. Does anyone have any updates on this issue? The bug is still present in Mac OS X 10.4.7, Darwin 8.7.1. Even if you think that it's been previously filed, file it again. Closing duplicates is easy (and the number of duplicates against a bug is, unofficially and to a limited extent, factored into its priority), but fixing bugs we don't know about is hard. This is especially true if you haven't seen a bug number for the bug. If you have a bug number, it's trivial for Apple folks to look up the status of the bug. If you don't have a bug number, it's hard for us to look up the bug and there may not /actually/ be a bug. Notwithstanding the above, I dug through Radar and I think the bug that you're concerned about is being tracked as <rdar://problem/3439519>. AFAICT, no progress has been made on it. Sorry for the bad news. This email sent to site_archiver(a)lists.apple.com

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Re: Filesystem bundles
by Quinn 25 Sep '06

25 Sep '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I've seen some indication that I need a bundle in /System/Library/Filesystems to make this happen - but I can't find anything describing what that bundle should contain, and all of the pre-existing ones seem different from eachother. extern kern_return_t DiskArbDiskAppearedWithMountpointPing_auto( char * disk, unsigned reserved0032, char * mountpoint ); where: o reserved0032 is kDiskArbDiskAppearedNetworkDiskMask (see below) o mountpoint is the place where the disk is mounted enum { kDiskArbDiskAppearedNetworkDiskMask = 1 << 3 }; Share and Enjoy -- 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 11:57 -0700 22/9/06, Michael Welch wrote: This is not yet documented. The master bug report covering the absence of VFS documentation is <rdar://problem/4445951>. A file system bundle /is/ the right solution if you're developing a local file system. DiskArb will consult these file system bundles as it probes for file systems to mount any new local disks that appear. However, the story is very different for network file systems. Ideally a network file system should be implemented as a URLMount framework plug-in. However, this plug-in architecture is not supported for third party use (and is apparently pretty broken anyway). This is <rdar://problem/3502170>. To make your network file system known to DiskArb, and hence to other apps on the system, like the Finder, you'll have to call DiskArb explicitly. Once you've mounted the volume (using any of the standard techniques, like <x-man-page://2/mount> or <x-man-page://8/mount>), you can get it to appear on the desktop by calling the DiskArbitration routine DiskArbDiskAppearedWithMountpointPing_auto. Unfortunately, this routine isn't part of the standard DiskArbitration framework headers, so you have to declare your own prototype for it. Here's the prototype below: o disk is the device on which the disk is mounted (in the case of a network volume, you pretty much make this up; however, it should mount the f_mntfromname returned by statfs) This routine is part of the old (pre 10.3), private, DiskArbitration framework API. When we introduced a new, public DiskArbitration API in Mac OS X 10.3, we didn't introduce a replacement for this routine because, in the long term, DiskArbitration will automatically pick up mounts by way of a kernel notification. So, ultimately, you won't need to call this routine for your volume to appear on the desktop. For that reason, I strongly recommend that you weak link against this symbol and, if it's not present, just don't call it. This email sent to site_archiver(a)lists.apple.com

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File opens while executing an application
by Sudarshan S 25 Sep '06

25 Sep '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:Received:Date:From:Subject:To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=E3p/iOhTeO8lAei3AjeBIrYZ3pF5R+LHh/vwQcHtwv/axEMHeFTNzV9IE2/8SdaIUv8/pvarGZnIMwh6hZ8lstG7fBcU1QHOqRrfsAlM3rj57W0IWh6FkxhPoikYxcV1Nh5nB2LXDUiGcvWj6RUFZhregeZFSrLj8xtIHVyukis= ; I am trying to understand loading sequence when an application is executed. I found that TextEdit.app opens more than 100 files whenever it is executed. Most of these files are plist, dylib and some dependent files in Frameworks. This was observed through Kauth hook. I would like to know whether these files are opened in sequence,i.e one at a time or not. If dependent files are opened in sequence, is that the reason why heavy applications like Firefox takes longer time to execute ? Regards, Sudarshan __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ 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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