November 2002 - Darwin-kernel

Re: devfs user client
by Matthias Ringwald 11 Nov '02

11 Nov '02

Hi Andrew, thanks for your answer. Could somebody help me clarify things a bit more ? For writing a working /dev/... device (driver)... (e.g. a device that could echo data or just provides the current date.. ) Do I have to re-compile the kernel ? Do I need to write a kernel extension ? Do I need the darwin kernel sources to write a user land driver ? I tried "Howto Add a Character Device to Darwin". http://www.opendarwin.org/documentation/chardev.php gcc failed because of the missing header <kernel/thread.h> In this LIRC Linux project, they create a device node with mknod (doesn't work on darwin) and then create unix socket and then bind it to the /dev/lircd node. looks pretty easy... on mac os x, the bind fails 'operation not supported' (I already failed making the dev node properly) I just tried mkfifo. Looks good, but I can't make a fifo in /dev/ .. when opening the fifo I get 'device is not configured' Any ideas for this ? thanks, Matthias Ringwald On Montag, November 11, 2002, at 08:16 Uhr, Andrew Gallatin wrote: Matthias Ringwald writes: hi I found a discussion on providing /dev/.. devices by a user client on this list from nov 2001. Is it possible to write a pseudo device driver that can be used by other applications over open/read/write/ioctl POSIX calls ? I'm trying to port the lirc linux infrared control to mac os x and it uses /dev/.. devices for their communication. Sure. Using ioctls and devices is much more portable when you've got code that runs on other UNIXes. Note that MacOS X uses devfs (the older, uglier one, I think), so you should make the special files from inside the driver. Also note that unlike linux & solaris, MacOS & *BSD do not support factory devices. Drew PS: Here's working sample code ripped from my (real hardware) driver. The idea is to make several /dev/sample* devices, with different permissions based on device number. _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: devfs user client
by Andrew Gallatin 11 Nov '02

11 Nov '02

Matthias Ringwald writes: > hi > > I found a discussion on providing /dev/.. devices by a user client on > this list from nov 2001. > Is it possible to write a pseudo device driver that can be used by > other applications over open/read/write/ioctl POSIX calls ? > > I'm trying to port the lirc linux infrared control to mac os x and it > uses /dev/.. devices for their communication. Sure. Using ioctls and devices is much more portable when you've got code that runs on other UNIXes. Note that MacOS X uses devfs (the older, uglier one, I think), so you should make the special files from inside the driver. Also note that unlike linux & solaris, MacOS & *BSD do not support factory devices. Drew PS: Here's working sample code ripped from my (real hardware) driver. The idea is to make several /dev/sample* devices, with different permissions based on device number. static int sample_macos_special_create () { int i, perms; char name[16]; sample_macos_major = cdevsw_add (-1, &sample_macos_cdevsw); if (sample_macos_major == -1) { return sample_macos_major; } /* got a cdevsw_entry, now create device nodes via devfs */ bzero (sample_macos_specials, SAMPLE_ARCH_MAX_MINOR * sizeof (void *)); for (i = 0; i < SAMPLE_ARCH_MAX_MINOR; i++) { if (i < 2 * SAMPLE_ARCH_MAX_INSTANCE) { if (i & 1) { /* priv. port, so use secure permissions */ sprintf (name, "samplep%d", i / 2); perms = 0600; } else { sprintf (name, "sample%d", i / 2); perms = 0666; } } else { sprintf (name, "sample%d", i); perms = 0666; } /* create the special file */ sample_macos_specials[i] = devfs_make_node (makedev (sample_macos_major, i), DEVFS_CHAR, UID_ROOT, GID_WHEEL, perms, name, i); if (sample_macos_specials[i] == NULL) { sample_macos_special_destroy (); return -1; } } return sample_macos_major; } /* * Undo the above. Remove the cdevsw, and free our special devices.. */ static void sample_macos_special_destroy () { int i; cdevsw_remove (sample_macos_major, &sample_macos_cdevsw); for (i = 0; i < SAMPLE_ARCH_MAX_MINOR; i++) { if (sample_macos_specials[i] != NULL) { devfs_remove (sample_macos_specials[i]); sample_macos_specials[i] = 0; } } sample_macos_major = -1; } _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: devfs user client
by Matthias Ringwald 11 Nov '02

11 Nov '02

hi I found a discussion on providing /dev/.. devices by a user client on this list from nov 2001. Is it possible to write a pseudo device driver that can be used by other applications over open/read/write/ioctl POSIX calls ? I'm trying to port the lirc linux infrared control to mac os x and it uses /dev/.. devices for their communication. thanks, Matthias Ringwald _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Kernel panic
by Jean-Edouard BABIN 11 Nov '02

11 Nov '02

on 11/11/02 16:30, + Sean McBride ; <sean.mcbride(a)matrox.com> wrote: > Jean-Edouard BABIN (Jeb(a)jeb.com.fr) wrote: > >> It's on jaguar in reality, but system.log just talk about a reboot... >> And /Library/Logs/panic.log only contain old crash log :/ > > /Library/Logs/panic.log doesn't get written to if you've set your boot- > args to remove the user-friendly multilingual panic screen. I haven't changed anything.. -- Jean-Edouard BABIN Mail: Jeb(a)jeb.com.fr Web : www.Jeb.com.fr IRC : Jeb @ Undernet _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Kernel panic
by Sean McBride 11 Nov '02

11 Nov '02

Jean-Edouard BABIN (Jeb(a)jeb.com.fr) wrote: >It's on jaguar in reality, but system.log just talk about a reboot... >And /Library/Logs/panic.log only contain old crash log :/ /Library/Logs/panic.log doesn't get written to if you've set your boot- args to remove the user-friendly multilingual panic screen. _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Atomic functions problem
by Sean McBride 11 Nov '02

11 Nov '02

Christian Pasin (christian(a)villagetronic.com) wrote: >I'm trying to use an atomic function in a NDRV driver (for example >AddAtomic), but these functions seem not to work correctly . My code is >like the following: You might check the Darwin source to see how AddAtomic is implemented. Presumably it calls the IOKit OSAddAtomic, but if not you may have found your problem. ;) _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Performance problems under 10.2
by Andrew Gallatin 11 Nov '02

11 Nov '02

Tyler Ward writes: > > Thirty million context switches, and 38 million syscalls. I'm pretty > sure this didn't happen before, and it certainly didn't use Try using ktrace/kdump to see what it is doing (ktrace/kdump show what syscalls a process is making) It might give a clue as to what's happening. Drew _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Kernel panic
by Jean-Edouard BABIN 11 Nov '02

11 Nov '02

It's on jaguar in reality, but system.log just talk about a reboot... And /Library/Logs/panic.log only contain old crash log :/ on 11/11/02 4:17, + sgreenis ; <sgreenis(a)matrox.com> wrote: > Jean-Edouard, > > Are you looking for the log which gets created in /Library/Logs? > Depending on what you are doing, there may also be useful information > in /var/log/system.log or in the Console window itself. > > Hope that helps, > Stephanie > > > On Sunday, November 10, 2002, at 09:02 PM, Jean-Edouard BABIN wrote: > >> Hi, >> >> I have just get a kernel panic, but i don't remember where is that >> crash log >> is stored >> Anybody remember the path ? -- Jean-Edouard BABIN Mail: Jeb(a)jeb.com.fr Web : www.Jeb.com.fr IRC : Jeb @ Undernet _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Kernel panic
by sgreenis 11 Nov '02

11 Nov '02

Jean-Edouard, Are you looking for the log which gets created in /Library/Logs? Depending on what you are doing, there may also be useful information in /var/log/system.log or in the Console window itself. Hope that helps, Stephanie On Sunday, November 10, 2002, at 09:02 PM, Jean-Edouard BABIN wrote: Hi, I have just get a kernel panic, but i don't remember where is that crash log is stored Anybody remember the path ? -- Jean-Edouard BABIN Mail: Jeb(a)jeb.com.fr Web : www.Jeb.com.fr IRC : Jeb @ Undernet _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored. _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Kernel panic
by Jean-Edouard BABIN 11 Nov '02

11 Nov '02

Hi, I have just get a kernel panic, but i don't remember where is that crash log is stored Anybody remember the path ? -- Jean-Edouard BABIN Mail: Jeb(a)jeb.com.fr Web : www.Jeb.com.fr IRC : Jeb @ Undernet _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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