December 2005 - Darwin-kernel

Re: Using semaphores in kernel level driver
by Mike Smith 23 Dec '05

23 Dec '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Yogesh, = Mike On Dec 23, 2005, at 5:21 AM, Yogesh P wrote: Hi Folks, I will have to use semaphore to make synchronization between the threads. Thanks in advance, Yogesh Pahilwan _______________________________________________ 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/drivers%40mu.org _______________________________________________ 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.… It sounds like you want to use a WorkLoop. Again, it's important to understand how to do things with I/O Kit; it sounds like, once again, you are trying to make things look like a different driver architecture. After creating a thread using IOCreateThread(), I will have to put that thread in a wait state and wake up that thread after receiving some interrupt. Is there any sample driver code on developer site which I can refer for using semaphore for synchronizing threads. This email sent to drivers(a)mu.org This email sent to site_archiver(a)lists.apple.com

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Using semaphores in kernel level driver
by Yogesh P 23 Dec '05

23 Dec '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi Folks, I will have to use semaphore to make synchronization between the threads. After creating a thread using IOCreateThread(), I will have to put that thread in a wait state and wake up that thread after receiving some interrupt. Is there any sample driver code on developer site which I can refer for using semaphore for synchronizing threads. Thanks in advance, Yogesh Pahilwan _______________________________________________ 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: SafeBoot nke Loading...
by Terry Lambert 22 Dec '05

22 Dec '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com -- 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 Dec 22, 2005, at 9:40 AM, Russ Seehafer wrote: I really need to figure out a way to force my nke to load in a safeboot situation. I know that probably doesn't make much sense, but due to the unique purpose of our application it is necessary. The nke is currently loaded via a startup item. I understand that the nke will not be loaded by the system (even with OSBundleRequired set) unless it is explicitly asked for by a KE that is being loaded, such as an IOKit driver. This was recently discussed on this list, and the list archives would probably be enlightening. This email sent to site_archiver(a)lists.apple.com

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SafeBoot nke Loading...
by Russ Seehafer 22 Dec '05

22 Dec '05

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:mime-version:to:message-id:content-type:from:subject:date:x-mailer:sender; b=jaaoGbNbXTbPZzDzYbvTswhCMgUi3Jmzib06vS9G/VPySCfJwVtepdscDM1YQPQI9ewXjZ9uJ1jnZ4fYMrbIvF8+xgqtLqn/dVHE2VQHnCumboebJGeUy5bn3n8m/zzMjm3jByn6P7SIeYR1SYKffdMbH2aHQ+dLpp3SN5dNL5I= _______________________________________________ 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: Ejecting removable disks and icons
by Dan Markarian 20 Dec '05

20 Dec '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi Jeremy, Yes. Dan On 19 Dec 2005, at 7:59 PM, Jeremy Pereira wrote: Ah, that makes sense. On Dec 20, 2005, at 00:59, Dan Markarian wrote: Hi Jeremy, Dan On 18 Dec 2005, at 5:59 AM, Jeremy Pereira wrote: _______________________________________________ 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.… The existing software passes the path to the coms device to the mount system call, *not* the IOMedia's BSD device. Would I be correct in guessing that the system uses the mount point's device file to locate the IOMedia object? I'd like to emphasize at this point that I am only porting this software, the design is not my fault! The software was originally written to talk to SCSI disks via a traditional SCSI pass through device. There is a user mode service which does all of the reads and writes and there is a kernel mode VFS driver. The two components talk to each other through a device file created for the purpose (call it the coms device), the driver by making function calls direct and the user mode service through the ioctl interface. The existing software passes the path to the coms device to the mount system call, *not* the IOMedia's BSD device. Would I be correct in guessing that the system uses the mount point's device file to locate the IOMedia object? It sounds as though the file system does not match against a media object in I/O Kit. We require the media object in order to request an ejection and also locate its icon. Does the disk in question not have a media object created for it? Does the file system talk directly to USB? I am porting a file system driver for magneto-optical disk drives from BSD to Mac OS X. Everything works fine at the BSD level. Disks will mount and you can read and write files to them and everything else you would normally expect to do. By creating an appropriate bundle in /System/Library/FileSystems I have got disks to automatically mount and appear as drives in the Finder. However, I have two issues: 1. The Finder will not eject disks when you ask it to. When you press the eject button next to the drive icon, nothing happens except any open windows displaying the content of the drive revert back up to the "computer" view. 2. The icon I am getting is the network drive icon. A USB drive icon would be more appropriate. The more pressing problem is the eject issue. How does the Finder notify the OS that a volume should be unmounted and ejected? This email sent to site_archiver(a)lists.apple.com

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Re: select on pipe blocked
by Terry Lambert 20 Dec '05

20 Dec '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com thanks hervé Works for me: #include <stdio.h> #include <stdlib.h> #include <sys/select.h> int main(int ac, char *av[]) { fd_set reads, excepts; int n; int i; int cnt; char buf[ 20]; FD_ZERO(&reads); FD_ZERO(&excepts); again: FD_SET(0, &reads); FD_SET(0, &excepts); n = select(10, &reads, 0, &excepts, 0); printf("n is %d\n", n); if (FD_ISSET(0, &reads)) { printf("reads\n"); if ((cnt = read(0, buf, 1)) != 1) { switch(cnt) { case 0: printf("EOF!\n"); exit(0); case -1: perror("read"); exit(2); default: printf("Odd count of %d\n", cnt); exit(3); } } } if (FD_ISSET(0, &excepts)) printf("excepts\n"); printf("\n"); goto again; } % echo "hello" | ./foo n is 1 reads n is 1 reads n is 1 reads n is 1 reads n is 1 reads n is 1 reads n is 1 reads EOF! -- 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 Dec 19, 2005, at 9:19 AM, Hervé Kergourlay wrote: on a clent/server schema with 2 processes, one, the producer is writing on a pipe, the other read the pipe with recv in an asynchronous mode so it's calling select() until the data are really available then is calling recv(). Everything is ok if the producer send datas. But the select() API on a pipe handle stays blocked until the timeout ends if the write process close the socket before sending all the datas if I'm using a socket instead of a pipe, the close is detected and the select return If I'm calling a blocking recv directly, the close is also detected This code is a unix standard code which is working on all standard Unix (linux, sun, hp, sgi, etc ...) anybody knows about a bug on the select on the close detection on a pipe ?? This email sent to site_archiver(a)lists.apple.com

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Re: Ejecting removable disks and icons
by Jeremy Pereira 20 Dec '05

20 Dec '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Ah, that makes sense. On Dec 20, 2005, at 00:59, Dan Markarian wrote: Hi Jeremy, Dan On 18 Dec 2005, at 5:59 AM, Jeremy Pereira wrote: _______________________________________________ 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.… I'd like to emphasize at this point that I am only porting this software, the design is not my fault! The software was originally written to talk to SCSI disks via a traditional SCSI pass through device. There is a user mode service which does all of the reads and writes and there is a kernel mode VFS driver. The two components talk to each other through a device file created for the purpose (call it the coms device), the driver by making function calls direct and the user mode service through the ioctl interface. The existing software passes the path to the coms device to the mount system call, *not* the IOMedia's BSD device. Would I be correct in guessing that the system uses the mount point's device file to locate the IOMedia object? It sounds as though the file system does not match against a media object in I/O Kit. We require the media object in order to request an ejection and also locate its icon. Does the disk in question not have a media object created for it? Does the file system talk directly to USB? I am porting a file system driver for magneto-optical disk drives from BSD to Mac OS X. Everything works fine at the BSD level. Disks will mount and you can read and write files to them and everything else you would normally expect to do. By creating an appropriate bundle in /System/Library/FileSystems I have got disks to automatically mount and appear as drives in the Finder. However, I have two issues: 1. The Finder will not eject disks when you ask it to. When you press the eject button next to the drive icon, nothing happens except any open windows displaying the content of the drive revert back up to the "computer" view. 2. The icon I am getting is the network drive icon. A USB drive icon would be more appropriate. The more pressing problem is the eject issue. How does the Finder notify the OS that a volume should be unmounted and ejected? This email sent to site_archiver(a)lists.apple.com

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select on pipe blocked
by Hervé Kergourlay 19 Dec '05

19 Dec '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Mozilla Thunderbird 1.0 (Windows/20041206) anybody knows about a bug on the select on the close detection on a pipe ?? thanks hervé begin:vcard fn;quoted-printable:Herv=C3=A9 Kergourlay n;quoted-printable:Kergourlay;Herv=C3=A9 org:Atempo;Engineering email;internet:herve.kergourlay@atempo.com title:Vos group Manager tel;work:02 97 68 40 29 tel;fax:02 97 68 40 25 tel;home:02 97 42 41 76 note:Only those who attempt the absurd can achieve the impossible x-mozilla-html:TRUE url:http://www.atempo.com version:2.1 end:vcard _______________________________________________ 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 on a clent/server schema with 2 processes, one, the producer is writing on a pipe, the other read the pipe with recv in an asynchronous mode so it's calling select() until the data are really available then is calling recv(). Everything is ok if the producer send datas. But the select() API on a pipe handle stays blocked until the timeout ends if the write process close the socket before sending all the datas if I'm using a socket instead of a pipe, the close is detected and the select return If I'm calling a blocking recv directly, the close is also detected This code is a unix standard code which is working on all standard Unix (linux, sun, hp, sgi, etc ...)

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Re: Ejecting removable disks and icons
by Dan Markarian 19 Dec '05

19 Dec '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi Jeremy, Dan On 18 Dec 2005, at 5:59 AM, Jeremy Pereira wrote: _______________________________________________ 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.… It sounds as though the file system does not match against a media object in I/O Kit. We require the media object in order to request an ejection and also locate its icon. Does the disk in question not have a media object created for it? Does the file system talk directly to USB? I am porting a file system driver for magneto-optical disk drives from BSD to Mac OS X. Everything works fine at the BSD level. Disks will mount and you can read and write files to them and everything else you would normally expect to do. By creating an appropriate bundle in /System/Library/FileSystems I have got disks to automatically mount and appear as drives in the Finder. However, I have two issues: 1. The Finder will not eject disks when you ask it to. When you press the eject button next to the drive icon, nothing happens except any open windows displaying the content of the drive revert back up to the "computer" view. 2. The icon I am getting is the network drive icon. A USB drive icon would be more appropriate. The more pressing problem is the eject issue. How does the Finder notify the OS that a volume should be unmounted and ejected? This email sent to site_archiver(a)lists.apple.com

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Ejecting removable disks and icons
by Jeremy Pereira 18 Dec '05

18 Dec '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.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.… I am porting a file system driver for magneto-optical disk drives from BSD to Mac OS X. Everything works fine at the BSD level. Disks will mount and you can read and write files to them and everything else you would normally expect to do. By creating an appropriate bundle in /System/Library/FileSystems I have got disks to automatically mount and appear as drives in the Finder. However, I have two issues: 1. The Finder will not eject disks when you ask it to. When you press the eject button next to the drive icon, nothing happens except any open windows displaying the content of the drive revert back up to the "computer" view. 2. The icon I am getting is the network drive icon. A USB drive icon would be more appropriate. The more pressing problem is the eject issue. How does the Finder notify the OS that a volume should be unmounted and ejected? This email sent to site_archiver(a)lists.apple.com

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