July 2002 - Darwin-kernel - lists.apple.com

Re: mmap
by Louis Demers 09 Jul '02

09 Jul '02

At 12:27 -0400 2002.07.09, Jim Magee wrote: On Tuesday, July 9, 2002, at 12:32 AM, Louis Demers wrote: trying to port inn news server 2.3.3 to osx and the standard distribution seems to have problems with a mmap call. A static data is mmap to a file and then porperly written (I dumped all 130180 bytes to a file and it's ok) but when unmapped, the file reverts to all zeros. I checked and the file descriptor is opened with O_RDWR, the mmap is done with PROT_WRITE|PROT_READ. Did you set the MAP_SHARED flag? GROUPheader = mmap(0, 131080, flag, MAP_SHARED, GROUPfd, 0) and the file descriptor GROUPfd was opened O_RDWR | O_CREAT. How large was the file when you mapped it, Initially the file doesn't exist sot it is created with 0 bytes. and how much of it did you map? I imagine that the call to mmap mapped all 131080 and extended the file. By "properly written" do you mean that you modified all the files pages in memory with store instructions? in c, various data was stored in the memory. at the address pointed to by the retur nvalue of mmap. How much of it was modified (up to but not beyond its current length)? every 8 or 10 bytes was modifed. Did you msync() your changes or just munmap()? I tried msync() at various points before and after the close (GROUPfd) but always before the munmap. When you say you "dumped all 130180 bytes to a file and it's OK", how did you do that? bozo = open ("/usr/local/news/spool/overview/bozo" , O_RDWR | O_TRUNC , 0777); syslog(L_FATAL, "LODE: create bozo in ov3:%d", bozo); write (bozo , (void *)GROUPheader, 131080); close(bozo); Did you copy from the mapped file to another from outside the program in question, or did you just issue a bunch of write() calls from the mapped memory into the "dump file"? Tried both: initially I did the second option, I called write() to dump the memory into the dump file. More info is needed? continuing the tests, I single stepped and notice at some points the mmap file has the proper data (did in a shell "od group.index") and I saw the correct data. I executed the same command a second time and oups the data is now all zeros ! as if the process to view the file interfered. I can do a "cp group.index toto" to make a succesfull snapshot of what the file should contain. If I do that a second time, it too seems to wipe out the mmap file ! Any help would be appreciated. It seems very voodoo. I was once quite active on Unix but never used mmap so my intuition can't guide me to detect if the code is at fault or the implementation of mmap. It is worth nothing that the code is reputed to work on the folowing OSes: AIX 4.3 FreeBSD 2.2.x and up HP-UX 10.20 and up Linux 2.x (tested with libc 5.4 or glibc 2.0 and up) OpenBSD 2.8 and up SCO 5.0.4 (tested with gcc 2.8.1 and cc) Solaris 2.5.x and up UnixWare 7.1 UX/4800 R11 and up --Jim -- Louis Demers ing. LouisDemers(a)mac.com _______________________________________________ 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: IPFirewall.ktext HELP
by Justin C. Walker 09 Jul '02

09 Jul '02

On Tuesday, July 9, 2002, at 10:09 AM, Joshua Graessley wrote: Some of these options may require that the kernel be recompiled as well. For example, dummynet support requires changes to the kernel as well as the IPFirewall kext. Thanks for pointing that out; I should have been more explicit: the support for dummynet and bridge is not implemented in the Darwin kernel, so turning those on will get you into trouble, as will the netgraph defines. The others (IPFIREWALL*, IPDIVERT), I think, are all enabled by default. Regards Justin On Tuesday, July 9, 2002, at 12:16 AM, Justin C. Walker wrote: On Monday, July 8, 2002, at 08:23 PM, Alberto wrote: Please, I have to do some changes in IPFW and for others UNIXs I should recompile my kernel and add: options NETGRAPH options NETGRAPH_PPPOE options NETGRAPH_SOCKET options NETGRAPH_IFACE options IPFIREWALL options IPFIREWALL_DEFAULT_TO_ACCEPT options IPFIREWALL_VERBOSE options IPFIREWALL_FORWARD options IPDIVERT options BRIDGE options DUMMYNET What exactly I need to do? You need to check out the NKE from the repository, make your changes, recompile, unload the current firewall NKE, and load your version. If you want Classic to run as well, you should unload the SharedIP extension after unloading the firewall, and then reload SharedIP before loading the firewall. If you make significant changes you may end up breaking Classic support in some way. Regards, Justin PS: you don't have netgraph in Darwin, and you don't need to worry about 'options' when building the NKE. -- Justin C. Walker, Curmudgeon-At-Large * Institute for General Semantics | When LuteFisk is outlawed | Only outlaws will have | LuteFisk *-------------------------------------- *-------------------------------* _______________________________________________ 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. -- Justin C. Walker, Curmudgeon-At-Large * Institute for General Semantics | Men are from Earth. | Women are from Earth. | Deal with it. *--------------------------------------*-------------------------------* _______________________________________________ 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: IPFirewall.ktext HELP
by Joshua Graessley 09 Jul '02

09 Jul '02

Some of these options may require that the kernel be recompiled as well. For example, dummynet support requires changes to the kernel as well as the IPFirewall kext. -josh On Tuesday, July 9, 2002, at 12:16 AM, Justin C. Walker wrote: On Monday, July 8, 2002, at 08:23 PM, Alberto wrote: Please, I have to do some changes in IPFW and for others UNIXs I should recompile my kernel and add: options NETGRAPH options NETGRAPH_PPPOE options NETGRAPH_SOCKET options NETGRAPH_IFACE options IPFIREWALL options IPFIREWALL_DEFAULT_TO_ACCEPT options IPFIREWALL_VERBOSE options IPFIREWALL_FORWARD options IPDIVERT options BRIDGE options DUMMYNET What exactly I need to do? You need to check out the NKE from the repository, make your changes, recompile, unload the current firewall NKE, and load your version. If you want Classic to run as well, you should unload the SharedIP extension after unloading the firewall, and then reload SharedIP before loading the firewall. If you make significant changes you may end up breaking Classic support in some way. Regards, Justin PS: you don't have netgraph in Darwin, and you don't need to worry about 'options' when building the NKE. -- Justin C. Walker, Curmudgeon-At-Large * Institute for General Semantics | When LuteFisk is outlawed | Only outlaws will have | LuteFisk *-------------------------------------- *-------------------------------* _______________________________________________ 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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Re: mmap
by Jim Magee 09 Jul '02

09 Jul '02

On Tuesday, July 9, 2002, at 12:32 AM, Louis Demers wrote: trying to port inn news server 2.3.3 to osx and the standard distribution seems to have problems with a mmap call. A static data is mmap to a file and then porperly written (I dumped all 130180 bytes to a file and it's ok) but when unmapped, the file reverts to all zeros. I checked and the file descriptor is opened with O_RDWR, the mmap is done with PROT_WRITE|PROT_READ. Did you set the MAP_SHARED flag? How large was the file when you mapped it, and how much of it did you map? By "properly written" do you mean that you modified all the files pages in memory with store instructions? How much of it was modified (up to but not beyond its current length)? Did you msync() your changes or just munmap()? When you say you "dumped all 130180 bytes to a file and it's OK", how did you do that? Did you copy from the mapped file to another from outside the program in question, or did you just issue a bunch of write() calls from the mapped memory into the "dump file"? More info is needed? --Jim _______________________________________________ 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: IPFirewall.ktext HELP
by Justin C. Walker 09 Jul '02

09 Jul '02

On Monday, July 8, 2002, at 08:23 PM, Alberto wrote: Please, I have to do some changes in IPFW and for others UNIXs I should recompile my kernel and add: options NETGRAPH options NETGRAPH_PPPOE options NETGRAPH_SOCKET options NETGRAPH_IFACE options IPFIREWALL options IPFIREWALL_DEFAULT_TO_ACCEPT options IPFIREWALL_VERBOSE options IPFIREWALL_FORWARD options IPDIVERT options BRIDGE options DUMMYNET What exactly I need to do? You need to check out the NKE from the repository, make your changes, recompile, unload the current firewall NKE, and load your version. If you want Classic to run as well, you should unload the SharedIP extension after unloading the firewall, and then reload SharedIP before loading the firewall. If you make significant changes you may end up breaking Classic support in some way. Regards, Justin PS: you don't have netgraph in Darwin, and you don't need to worry about 'options' when building the NKE. -- Justin C. Walker, Curmudgeon-At-Large * Institute for General Semantics | When LuteFisk is outlawed | Only outlaws will have | LuteFisk *--------------------------------------*-------------------------------* _______________________________________________ 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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mmap
by Louis Demers 09 Jul '02

09 Jul '02

Hi, trying to port inn news server 2.3.3 to osx and the standard distribution seems to have problems with a mmap call. A static data is mmap to a file and then porperly written (I dumped all 130180 bytes to a file and it's ok) but when unmapped, the file reverts to all zeros. I checked and the file descriptor is opened with O_RDWR, the mmap is done with PROT_WRITE|PROT_READ. Any clue as to what needs to be done in order for changes in memory to be permanently written to file. (order of mmap, mmunap, open, close seuqneces...)?? Thx -- Louis Demers ing. Louis.Demers(a)videotron.ca _______________________________________________ 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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IPFirewall.ktext HELP
by Alberto 09 Jul '02

09 Jul '02

Please, I have to do some changes in IPFW and for others UNIXs I should recompile my kernel and add: options NETGRAPH options NETGRAPH_PPPOE options NETGRAPH_SOCKET options NETGRAPH_IFACE options IPFIREWALL options IPFIREWALL_DEFAULT_TO_ACCEPT options IPFIREWALL_VERBOSE options IPFIREWALL_FORWARD options IPDIVERT options BRIDGE options DUMMYNET What exactly I need to do? Thanx a lot!! Alberto V. M. Apple Developers Connection member since 1999 --- Marlin Project http://macosx.homeunix.org _______________________________________________ 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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Writing my own file system
by ty 08 Jul '02

08 Jul '02

Greetings! I've successfully converted the nullfs driver into fully working kext. I have also stripped out a lot of the nullfs functionality, but retained some code that keeps the driver functional (i.e. can be mounted, cd'd into, ls'd, unmounted..) Now I want to take this code to the next level. I have 2 projects, one is for the company I work for, and the other is to pop up a filesystem for the MP3 player on a cell phone (Samsung SCH-M200). Is anyone able to point me to references describing how to implement each of the required vfs and vops? I think a very educational next move for me is to return a custom root node, with a few entries, each of which have artificial nodes and contents themselves, all initialized with hardcoded data. An example session might look like: box:~ root# cd /mnt box:/mnt root# ls -alF total XX drwxrwxr-x 2 root admin 1024 Jul 4 11:02 point box:/mnt root# mount -t myfs /mnt/point # highly construed arguments, exemplary only :D box:/mnt root# cd point box:/mnt/point root# ls -alF total XX drwxr-xr-x XX root staff 1024 Jul 8 09:34 ./ drwxr-xr-x XX root wheel 1024 Jun 28 10:28 ../ -rwxrwxr-x XX root admin 42 Jul 4 11:02 retract.c -rwxr-x--- XX ty staff 12 Jul 4 11:02 head.txt -rwx------ XX root admin 270 Jul 4 11:02 turtle.c box:/mnt/point root# cat head.txt Sample text box:/mnt/point root# I would very much appreciate some relevant code sections to get something like this working, and I think I can piece together the rest of the system through the debugging output and other FS code that already exists in the kernel sources.. Thank you very much for your help and time :D Ty _______________________________________________ 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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Emilie Autumn @ MyMac.com
by Michael Kristof 05 Jul '02

05 Jul '02

Bonjour! Here an article which will interest surely all in the world of Macs. It is about the beautiful young singer/violinist/computer genius of "Emilie Autumn." http://www.mymac.com/walkowich/6.28.02.shtml It is brilliant, and you must should visit her website too: http://www.emilieautumn.com L` you can write a contest between Emilie and MyMac.com called by "FantasMac." Very enthralling. And you can meet her iBook called by "Puppy!" MK On Friday, 05, 2002, at 01:23PM, Justin C. Walker <justin(a)mac.com> wrote: >On Friday, July 5, 2002, at 11:11 AM, Scott Taggart wrote: > >> Hi, >> >> Could someone please point me to the code that writes the raw "panic" >> messages to the display before waiting for the debugger, etc.? > >It's in the 'xnu' tree. You can use a command like > > find /SandBox/sb/xnu -type f |xargs grep ^panic > >to track it down (the '^panic' assumes that the definition of "panic()" >is left-justified in the file), or you can use 'cscope' (the xnu >makefile has a 'cscope' target). > >Regards, > >Justin > >PS: Please don't cross-post; either choose one list, or post separately >to each. > >-- >/~\ The ASCII Justin C. Walker, Curmudgeon-at-Large >\ / Ribbon Campaign > X Help cure HTML Email >/ \ >_______________________________________________ >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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Re: Where is code that writes raw debug/panic messages to display?
by Justin C. Walker 05 Jul '02

05 Jul '02

On Friday, July 5, 2002, at 11:11 AM, Scott Taggart wrote: Hi, Could someone please point me to the code that writes the raw "panic" messages to the display before waiting for the debugger, etc.? It's in the 'xnu' tree. You can use a command like find /SandBox/sb/xnu -type f |xargs grep ^panic to track it down (the '^panic' assumes that the definition of "panic()" is left-justified in the file), or you can use 'cscope' (the xnu makefile has a 'cscope' target). Regards, Justin PS: Please don't cross-post; either choose one list, or post separately to each. -- /~\ The ASCII Justin C. Walker, Curmudgeon-at-Large \ / Ribbon Campaign X Help cure HTML Email / \ _______________________________________________ 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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