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• How can i uniquely identify users trying to open() a kernel module?

  - by user349072

  Dear Gurus, I'm working on a Kernel module and i'm trying to Uniquely identify each one of the users trying to open() the module ( can be either processes or threads ). what is the best way to identify them? is there an ID i can get from a system call? i wish to get all users in a list that specifies whether they're trying to open the module for read \ write and i need to know which one tried acting... many many thanks. in regards, IK

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• How do I add a merge module to an installer that is in the same solution?

  - by Max Schmeling

  I have two installers and a merge module in a solution, and I need to include that merge module in one of the installers. Is this possible without building the merge module and referencing the *.msm file directly? Is there any way to do it like a project reference?

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• In what situation should the built-in 'operator' module be used in python?

  - by apphacker

  I'm speaking of this module: http://docs.python.org/library/operator.html From the article: The operator module exports a set of functions implemented in C corresponding to the intrinsic operators of Python. For example, operator.add(x, y) is equivalent to the expression x+y. The function names are those used for special class methods; variants without leading and trailing __ are also provided for convenience. I'm not sure I understand the benefit or purpose of this module.

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• How can I tell cpan to change the target for the module installation?

  - by sid_com

  Hello! When I installed perl from the source the first nice surprise was that without doing something all module installed from now on were available to the new perl. Since I didn't find one module on cpan that comes with my OS I have to use for some scripts the onboard-perl. For one of these scripts I would like to install Text::Format or Text::Autoformat (didn't find the docu for that module on cpan). My question: how can I tell cpan to install the module this one time for the OS-distro-perl?

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• I've filed an ITP bug on bugs.debian.org - now how do I get the package into Ubuntu?

  - by George Edison

  I've written a development library that I would like to include in the Ubuntu archives. From what I understand, the best way to do this is to first get the package into Debian and then request a package sync. Here is the ITP bug: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=691467 Now my question is simply... what do I do now? Looking at this page, I see horrifying things like "419 days in preparation" and "last activity 404 days ago". I get the impression that getting a package into Debian is a slow process. Is there anything I can do to speed up the process? I've tried to do as much work as I can to smooth out the process - I've got a branch with Debian packaging (which gets by Lintian without any errors).

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• A simple DotNetNuke article module with C# and VB.NET Source

  - by Chris Hammond

  For the DotNetNuke Connections conference last month I provided an advanced DotNetNuke module development course as a pre-conference training session. That training covered details on how to implement some of the newer features in the DotNetNuke platform within custom modules, mainly ContentItem integration and Taxonomy features. For the course I created a very basic Article module for DotNetNuke, ultimately naming it DNNSimpleArticle. For the course I created both a C# and a VB.NET version of the...(read more)

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• gnome-tweak-tool doesn't start due to "ImportError: No module named gi" error

  - by Khajak Vahanyan

  I am using Ubuntu 11.10 with Gnome Shell and have a problem with gnome-tweak-tool. When I click on it, it does nothing and when I try to open with terminal it gives this error: Traceback (most recent call last): File "/usr/bin/gnome-tweak-tool", line 22, in <module> import gi ImportError: No module named gi I googled a bit, found some solutions (reinstalled some python-gobject packages), but still didn't help./

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• Script to only execute during first install of a package

  - by Jeroen

  I recently started packaging up some of my software and publishing it on Launchpad. The installation and removal works fine, but upgrading the package form one version to the next version is problematic. The problem is that there are some scripts that only need to run during the first installation of the package. These scripts populate the DB, create a user, etc. They are currently called in the package.postinst configure) section. However this results in them being called during an upgrade as well as shown in the diagram. Is there a way to include a maintainer script in a .deb package that only executes during the first installation of the package and not during an upgrade? Or what would be an elegant way to include some initial setup scripts in a .deb package?

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• Upgrade to 11.10 caused rt2800usb module to be blacklisted

  - by Shevek

  I just upgraded from Kubuntu 11.04 to 11.10, and I noticed that after the upgrade my USB wireless card was no longer recognized. It turns out that the rt2800usb module had been added (automatically, I assume, unless previously the module had been loading despite being blacklisted) to /etc/modprobe.d/blacklist.conf. I re-enabled the wireless card by commenting out the blacklist line and adding rt2800usb to /etc/modules, but I was wondering if there was a reason for rt2800usb being added to the blacklist.

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• Kernel module implementation estimate

  - by Ivan Teterevkov

  I have a very abstract question about a kernel module writing estimate. How much dev-hours/months may required to write or, especially, port an existant kernel driver for a new PCI HBA from one operating system to another (with different kernel API)? I am porting an already written kernel module for 82599 for Linux kernel to OS X's IOKit and try to get a working alpha. I can't imagine for how long this task may expand in time.

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• Recording Available - Features and Functions Payments Module

  - by MHundal

  The Payments Module recording provides a high-level overview of Payments Processing in ETPM.  The recording discusses the Payments Data Model, including Payment Events, Tenders, Tender Control, Deposit and Deposit Control.  In addition, there is a product demonstration of payment processing in the system. Payments Module Overview:  https://oracletalk.webex.com/oracletalk/ldr.php?AT=pb&SP=MC&rID=67364002&rKey=9fe755e4f41a2d4d

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• Adding PPA on install

  - by trampster

  I have a app I am packaging for ubuntu. I don't like the idea that if included in the ubuntu repositories I will have no control over updating that application. I don't want my users stuck on an out dated version for up to 6 months. I also do not want my users to have to manually add a PPA themselves to get updates as the target user will not have the technical know how to do this. Is it OK to have my .deb add a PPA on install. So that I can roll out stable updates to my ubuntu users.

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• Building a Debian package with two buildsystem

  - by queueoverflow

  I have a package that needs to be build with both a regular makefile and a setup.py. The thing is that the Debian packaging magic that is invoked via debuild would recognize a makefile and do the right make make install DESTDIR=??? thing and get it working right. When I only have a setup.py sitting there and have dh $@ --with python3 --buildsystem pybuild in debian/rules, it will correctly install the Python module with python3 setup.py build python3 setup.py install --install-layout deb --root=??? ??? I do not know all those flags. And I think that I do not need to. I just want the makefile magic to happen, and then the setup.py magic. How can I tell debuild to do both? When I do the following in debian/rules %: dh $@ dh $@ --with python3 --buildsystem pybuild it will only put the first one into the resulting package. I tried to delete the debhelper.log between those, but that did not change much.

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• Is there a debian/ubuntu policy on softlinking things to another location in opt once they're installed?

  - by AbrahamVanHelpsing

  Is there a debian/ubuntu policy on softlinking things to another location in opt once they're installed properly in usr/share or usr/lib? Here's a simple example: Packaging up dnsenum. It's a REALLY simple package (4 files). A perl script, two wordlists, and a readme. So from what I gather: The wordlists should go in usr/share/dnsenum/* The perl script itself would go in usr/lib/dnsenum/ The readme would go in usr/share/doc/dnsenum/ Add a wrapper bash script that goes in bin and just passes arguments to dnsenum.pl. The question is this: If there are various tools that provide wordlists or some other shared resource, is there a policy on linking all the wordlists from different packages in to /opt/wordlists/ ? It seems like the "right" thing to do respecting the directory structure while still making things convenient.

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• In what cases should I install (and configure) Postfix as a desktop user?

  - by Gonzalo

  Possible cases: 1) I plan to do Debian packaging (this case is the motivation since postfix gets installed as a dependency of some development packages, so it means that in such a case might be necessary). 2) I plan to use Evolution and a Internet provider mail account. 3) I plan to use gmail. Surely if I read Postfix documentation I may find the answer, but its huge and couldn't find it. In any case how (or where) should I find the answer to a question like that by myself? (I really tried)

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• How to load kernel module at startup on FC9?

  - by dicroce

  I need to know how to automatically load a kernel module at startup on FC9. All the sites talk about adding an entry to /etc/modules.conf.... But that does not exist on FC9... Instead I have /etc/modprobe.d/ directory... Now, I suppose I need to put a file in this dir for my driver but I have no idea how to write this file... I just need "modprobe name" to be run...

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• Maven test dependency in multi module project

  - by user209947

  I use maven to build a multi module project. My module 2 depends on Module 1 src at compile scope and module 1 tests in test scope. Module 2 - <dependency> <groupId>blah</groupId> <artifactId>MODULE1</artifactId> <version>blah</version> <classifier>tests</classifier> <scope>test</scope> </dependency> This works fine. Say my module 3 depends on Module1 src and tests at compile time. Module 3 - <dependency> <groupId>blah</groupId> <artifactId>MODULE1</artifactId> <version>blah</version> <classifier>tests</classifier> <scope>complie</scope> </dependency> When I run mvn clean install, my build runs till module 3, fails at module 3 as it couldnt resolve the module 1 test dependency. Then I do a mvn install on module 3 alone, go back and run mvn install on my parent pom to make it build. How can i fix this?

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• MBuild packaging miss some dependencies

  - by stacker

  MBuild misses some dependencies when packaging the project. How can I fix this?

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• MSDeploy packaging miss some dependencies

  - by stacker

  MSDeploy misses some dependencies when packaging the project. How can I fix this?

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• kernel module compiling error

  - by wati

  sh@ubuntu:/home/ccpp/helloworld$ make gcc-4.6 -O2 -DMODULE -D_KERNEL_ -W -Wall -Wstrict-prototypes -Wmissing-prototypes -isystem /lib/modules/`uname -r`/build/include -c -o hello-1.o hello-1.c hello-1.c:4:0: warning: "MODULE" redefined [enabled by default] <command-line>:0:0: note: this is the location of the previous definition hello-1.c:6:0: warning: "_KERNEL_" redefined [enabled by default] <command-line>:0:0: note: this is the location of the previous definition In file included from /lib/modules/3.2.0-25-generic/build/include/linux/list.h:4:0, from /lib/modules/3.2.0-25-generic/build/include/linux/module.h:9, from hello-1.c:7: /lib/modules/3.2.0-25-generic/build/include/linux/types.h:13:2: warning: #warning "Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders" [-Wcpp] In file included from /lib/modules/3.2.0-25-generic/build/include/linux/module.h:9:0, from hello-1.c:7: /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘INIT_LIST_HEAD’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:26:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:27:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘__list_add’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:41:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:42:5: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:43:5: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:44:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘list_add’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:62:28: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘list_add_tail’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:76:22: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘__list_del’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:88:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:89:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘__list_del_entry’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:101:18: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:101:31: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘list_del’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:106:18: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:106:31: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:107:7: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:108:7: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘list_replace’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:125:5: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:125:17: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:126:5: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:127:5: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:127:17: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:128:5: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘list_is_last’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:179:13: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘list_empty’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:188:13: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘list_empty_careful’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:206:31: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:207:40: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘list_rotate_left’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:219:15: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘list_is_singular’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:230:35: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:230:49: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘__list_cut_position’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:236:37: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:237:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:237:19: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:238:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:239:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:240:7: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:241:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:242:11: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘list_cut_position’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:265:8: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘__list_splice’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:277:32: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:278:31: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:280:7: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:281:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:283:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:284:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘list_splice’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:296:33: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘list_splice_tail’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:308:27: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘list_splice_init’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:322:33: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘list_splice_tail_init’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:339:27: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘INIT_HLIST_NODE’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:572:3: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:573:3: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘hlist_unhashed’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:578:11: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘hlist_empty’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:583:11: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘__hlist_del’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:588:29: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:589:31: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:592:7: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘hlist_del’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:598:3: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:599:3: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘hlist_add_head’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:612:30: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:613:3: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:615:8: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:615:20: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:616:3: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:617:3: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:617:15: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘hlist_add_before’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:624:3: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:624:17: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:625:3: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:626:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:626:18: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:627:5: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘hlist_add_after’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:633:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:633:16: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:634:3: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:635:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:635:18: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:637:9: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:638:7: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:638:29: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘hlist_add_fake’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:644:3: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:644:15: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h: In function ‘hlist_move_list’: /lib/modules/3.2.0-25-generic/build/include/linux/list.h:654:5: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:654:18: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:655:9: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:656:6: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:656:27: error: dereferencing pointer to incomplete type /lib/modules/3.2.0-25-generic/build/include/linux/list.h:657:5: error: dereferencing pointer to incomplete type In file included from /lib/modules/3.2.0-25-generic/build/include/linux/module.h:12:0, from hello-1.c:7: /lib/modules/3.2.0-25-generic/build/include/linux/cache.h: At top level: /lib/modules/3.2.0-25-generic/build/include/linux/cache.h:5:23: fatal error: asm/cache.h: No such file or directory compilation terminated. make: *** [hello-1.o] Error 1 i got this error after compiling an helloworld program my program is #define MODULE #define LINUX #define _KERNEL_ #include <linux/module.h> #include <linux/kernel.h> int init_module(void) { printk("<1>hello World 1.\n"); return 0; } void cleanup_module(void) { printk(KERN_ALERT "goodbye world 1.\n"); } MODULE_LICENSE("GPL"); my make file is: TARGET := hello-1 WARN := -W -Wall -Wstrict-prototypes -Wmissing-prototypes INCLUDE := -isystem /lib/modules/`uname -r`/build/include CFLAGS := -O2 -DMODULE -D_KERNEL_ ${WARN} ${INCLUDE} CC := gcc-4.6 ${TARGET}.o: ${TARGET}.c .PHONY: clean clean: rm -rf ${TARGET}.o iam usin kernel 3.2.0.25 as novice i can't able to figure out where the problem is I SEARCHED EVERY THING I CAN TO KNOW ABOUT THIS ERROR BUT I CANT UNDERSTAND &I GET IRRELEVANT DOCS anybody help me please

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• Organizations &amp; Architecture UNISA Studies &ndash; Chap 7

  - by MarkPearl

  Learning Outcomes Name different device categories Discuss the functions and structure of I/.O modules Describe the principles of Programmed I/O Describe the principles of Interrupt-driven I/O Describe the principles of DMA Discuss the evolution characteristic of I/O channels Describe different types of I/O interface Explain the principles of point-to-point and multipoint configurations Discuss the way in which a FireWire serial bus functions Discuss the principles of InfiniBand architecture External Devices An external device attaches to the computer by a link to an I/O module. The link is used to exchange control, status, and data between the I/O module and the external device. External devices can be classified into 3 categories… Human readable – e.g. video display Machine readable – e.g. magnetic disk Communications – e.g. wifi card I/O Modules An I/O module has two major functions… Interface to the processor and memory via the system bus or central switch Interface to one or more peripheral devices by tailored data links Module Functions The major functions or requirements for an I/O module fall into the following categories… Control and timing Processor communication Device communication Data buffering Error detection I/O function includes a control and timing requirement, to coordinate the flow of traffic between internal resources and external devices. Processor communication involves the following… Command decoding Data Status reporting Address recognition The I/O device must be able to perform device communication. This communication involves commands, status information, and data. An essential task of an I/O module is data buffering due to the relative slow speeds of most external devices. An I/O module is often responsible for error detection and for subsequently reporting errors to the processor. I/O Module Structure An I/O module functions to allow the processor to view a wide range of devices in a simple minded way. The I/O module may hide the details of timing, formats, and the electro mechanics of an external device so that the processor can function in terms of simple reads and write commands. An I/O channel/processor is an I/O module that takes on most of the detailed processing burden, presenting a high-level interface to the processor. There are 3 techniques are possible for I/O operations Programmed I/O Interrupt[t I/O DMA Access Programmed I/O When a processor is executing a program and encounters an instruction relating to I/O it executes that instruction by issuing a command to the appropriate I/O module. With programmed I/O, the I/O module will perform the requested action and then set the appropriate bits in the I/O status register. The I/O module takes no further actions to alert the processor. I/O Commands To execute an I/O related instruction, the processor issues an address, specifying the particular I/O module and external device, and an I/O command. There are four types of I/O commands that an I/O module may receive when it is addressed by a processor… Control – used to activate a peripheral and tell it what to do Test – Used to test various status conditions associated with an I/O module and its peripherals Read – Causes the I/O module to obtain an item of data from the peripheral and place it in an internal buffer Write – Causes the I/O module to take an item of data form the data bus and subsequently transmit that data item to the peripheral The main disadvantage of this technique is it is a time consuming process that keeps the processor busy needlessly I/O Instructions With programmed I/O there is a close correspondence between the I/O related instructions that the processor fetches from memory and the I/O commands that the processor issues to an I/O module to execute the instructions. Typically there will be many I/O devices connected through I/O modules to the system – each device is given a unique identifier or address – when the processor issues an I/O command, the command contains the address of the address of the desired device, thus each I/O module must interpret the address lines to determine if the command is for itself. When the processor, main memory and I/O share a common bus, two modes of addressing are possible… Memory mapped I/O Isolated I/O (for a detailed explanation read page 245 of book) The advantage of memory mapped I/O over isolated I/O is that it has a large repertoire of instructions that can be used, allowing more efficient programming. The disadvantage of memory mapped I/O over isolated I/O is that valuable memory address space is sued up. Interrupts driven I/O Interrupt driven I/O works as follows… The processor issues an I/O command to a module and then goes on to do some other useful work The I/O module will then interrupts the processor to request service when is is ready to exchange data with the processor The processor then executes the data transfer and then resumes its former processing Interrupt Processing The occurrence of an interrupt triggers a number of events, both in the processor hardware and in software. When an I/O device completes an I/O operations the following sequence of hardware events occurs… The device issues an interrupt signal to the processor The processor finishes execution of the current instruction before responding to the interrupt The processor tests for an interrupt – determines that there is one – and sends an acknowledgement signal to the device that issues the interrupt. The acknowledgement allows the device to remove its interrupt signal The processor now needs to prepare to transfer control to the interrupt routine. To begin, it needs to save information needed to resume the current program at the point of interrupt. The minimum information required is the status of the processor and the location of the next instruction to be executed. The processor now loads the program counter with the entry location of the interrupt-handling program that will respond to this interrupt. It also saves the values of the process registers because the Interrupt operation may modify these The interrupt handler processes the interrupt – this includes examination of status information relating to the I/O operation or other event that caused an interrupt When interrupt processing is complete, the saved register values are retrieved from the stack and restored to the registers Finally, the PSW and program counter values from the stack are restored. Design Issues Two design issues arise in implementing interrupt I/O Because there will be multiple I/O modules, how does the processor determine which device issued the interrupt? If multiple interrupts have occurred, how does the processor decide which one to process? Addressing device recognition, 4 general categories of techniques are in common use… Multiple interrupt lines Software poll Daisy chain Bus arbitration For a detailed explanation of these approaches read page 250 of the textbook. Interrupt driven I/O while more efficient than simple programmed I/O still requires the active intervention of the processor to transfer data between memory and an I/O module, and any data transfer must traverse a path through the processor. Thus is suffers from two inherent drawbacks… The I/O transfer rate is limited by the speed with which the processor can test and service a device The processor is tied up in managing an I/O transfer; a number of instructions must be executed for each I/O transfer Direct Memory Access When large volumes of data are to be moved, an efficient technique is direct memory access (DMA) DMA Function DMA involves an additional module on the system bus. The DMA module is capable of mimicking the processor and taking over control of the system from the processor. It needs to do this to transfer data to and from memory over the system bus. DMA must the bus only when the processor does not need it, or it must force the processor to suspend operation temporarily (most common – referred to as cycle stealing). When the processor wishes to read or write a block of data, it issues a command to the DMA module by sending to the DMA module the following information… Whether a read or write is requested using the read or write control line between the processor and the DMA module The address of the I/O device involved, communicated on the data lines The starting location in memory to read from or write to, communicated on the data lines and stored by the DMA module in its address register The number of words to be read or written, communicated via the data lines and stored in the data count register The processor then continues with other work, it delegates the I/O operation to the DMA module which transfers the entire block of data, one word at a time, directly to or from memory without going through the processor. When the transfer is complete, the DMA module sends an interrupt signal to the processor, this the processor is involved only at the beginning and end of the transfer. I/O Channels and Processors Characteristics of I/O Channels As one proceeds along the evolutionary path, more and more of the I/O function is performed without CPU involvement. The I/O channel represents an extension of the DMA concept. An I/O channel ahs the ability to execute I/O instructions, which gives it complete control over I/O operations. In a computer system with such devices, the CPU does not execute I/O instructions – such instructions are stored in main memory to be executed by a special purpose processor in the I/O channel itself. Two types of I/O channels are common A selector channel controls multiple high-speed devices. A multiplexor channel can handle I/O with multiple characters as fast as possible to multiple devices. The external interface: FireWire and InfiniBand Types of Interfaces One major characteristic of the interface is whether it is serial or parallel parallel interface – there are multiple lines connecting the I/O module and the peripheral, and multiple bits are transferred simultaneously serial interface – there is only one line used to transmit data, and bits must be transmitted one at a time With new generation serial interfaces, parallel interfaces are becoming less common. In either case, the I/O module must engage in a dialogue with the peripheral. In general terms the dialog may look as follows… The I/O module sends a control signal requesting permission to send data The peripheral acknowledges the request The I/O module transfers data The peripheral acknowledges receipt of data For a detailed explanation of FireWire and InfiniBand technology read page 264 – 270 of the textbook

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• Ubuntu 12.04 OpenCL with Intel and Radeon?

  - by Steve

  I want to setup my Ubuntu 12.04 with OpenCL(Open Computing Language) support for i7 2600k and Radeon HD5870. My Monitor is connected to the integrated Graphics of the i7. Intel OpenCL SDK is installed and working. Iteration of avaliable OpenCL devices shows 2 entries for Intel. As recommended I installed AMD APP SDK 2.6 first and then the fglrx driver. I installed fglrx from Ubuntu repositories. This works fine till here. When I run aticonfig --inital -f and restart the system I get into trouble. Xorg starts only in low-graphics mode. cat /var/log/Xorg.0.log [ 21.201] X.Org X Server 1.12.2 Release Date: 2012-05-29 [ 21.201] X Protocol Version 11, Revision 0 [ 21.201] Build Operating System: Linux 2.6.24-29-xen x86_64 Ubuntu [ 21.201] Current Operating System: Linux chimera 3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:52:17 UTC 2012 x86_ [ 21.201] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.2.0-24-generic root=UUID=c137757b-486b-4514-9dfe-00c97662 [ 21.201] Build Date: 05 June 2012 08:35:55AM [ 21.201] xorg-server 2:1.12.2+git20120605+server-1.12-branch.aaf48906-0ubuntu0ricotz~precise (For technical suppor [ 21.201] Current version of pixman: 0.26.0 [ 21.201] Before reporting problems, check http://wiki.x.org to make sure that you have the latest version. [ 21.201] Markers: (--) probed, (**) from config file, (==) default setting, (++) from command line, (!!) notice, (II) informational, (WW) warning, (EE) error, (NI) not implemented, (??) unknown. [ 21.201] (==) Log file: "/var/log/Xorg.0.log", Time: Fri Jun 8 14:22:36 2012 [ 21.247] (==) Using config file: "/etc/X11/xorg.conf" [ 21.247] (==) Using system config directory "/usr/share/X11/xorg.conf.d" [ 21.450] (==) ServerLayout "aticonfig Layout" [ 21.450] (**) |-->Screen "aticonfig-Screen[0]-0" (0) [ 21.450] (**) | |-->Monitor "aticonfig-Monitor[0]-0" [ 21.451] (**) | |-->Device "aticonfig-Device[0]-0" [ 21.451] (==) Automatically adding devices [ 21.451] (==) Automatically enabling devices [ 21.466] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist. [ 21.466] Entry deleted from font path. [ 21.466] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist. [ 21.466] Entry deleted from font path. [ 21.466] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist. [ 21.466] Entry deleted from font path. [ 21.473] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist. [ 21.473] Entry deleted from font path. [ 21.473] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist. [ 21.473] Entry deleted from font path. [ 21.473] (WW) The directory "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType" does not exist. [ 21.473] Entry deleted from font path. [ 21.473] (==) FontPath set to: /usr/share/fonts/X11/misc, /usr/share/fonts/X11/Type1, built-ins [ 21.473] (==) ModulePath set to "/usr/lib/x86_64-linux-gnu/xorg/extra-modules,/usr/lib/xorg/extra-modules,/usr/lib [ 21.473] (II) The server relies on udev to provide the list of input devices. If no devices become available, reconfigure udev or disable AutoAddDevices. [ 21.473] (II) Loader magic: 0x7f0ad3b9ab00 [ 21.473] (II) Module ABI versions: [ 21.473] X.Org ANSI C Emulation: 0.4 [ 21.473] X.Org Video Driver: 12.0 [ 21.473] X.Org XInput driver : 16.0 [ 21.473] X.Org Server Extension : 6.0 [ 21.473] (--) PCI:*(0:0:2:0) 8086:0122:1458:d000 rev 9, Mem @ 0xfb800000/4194304, 0xe0000000/268435456, I/O @ 0x00 [ 21.473] (--) PCI: (0:1:0:0) 1002:6898:1787:2289 rev 0, Mem @ 0xd0000000/268435456, 0xfbdc0000/131072, I/O @ 0x000 [ 21.473] (II) Open ACPI successful (/var/run/acpid.socket) [ 21.473] (II) "extmod" will be loaded by default. [ 21.473] (II) "dbe" will be loaded by default. [ 21.473] (II) "glx" will be loaded. This was enabled by default and also specified in the config file. [ 21.473] (II) "record" will be loaded by default. [ 21.473] (II) "dri" will be loaded by default. [ 21.473] (II) "dri2" will be loaded by default. [ 21.473] (II) LoadModule: "glx" [ 21.732] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/extensions/libgl [ 21.934] (II) Module glx: vendor="Advanced Micro Devices, Inc." [ 21.934] compiled for 6.9.0, module version = 1.0.0 [ 21.934] (II) Loading extension GLX [ 21.934] (II) LoadModule: "extmod" [ 22.028] (II) Loading /usr/lib/xorg/modules/extensions/libextmod.so [ 22.041] (II) Module extmod: vendor="X.Org Foundation" [ 22.041] compiled for 1.12.2, module version = 1.0.0 [ 22.041] Module class: X.Org Server Extension [ 22.041] ABI class: X.Org Server Extension, version 6.0 [ 22.041] (II) Loading extension MIT-SCREEN-SAVER [ 22.041] (II) Loading extension XFree86-VidModeExtension [ 22.041] (II) Loading extension XFree86-DGA [ 22.041] (II) Loading extension DPMS [ 22.041] (II) Loading extension XVideo [ 22.041] (II) Loading extension XVideo-MotionCompensation [ 22.041] (II) Loading extension X-Resource [ 22.041] (II) LoadModule: "dbe" [ 22.041] (II) Loading /usr/lib/xorg/modules/extensions/libdbe.so [ 22.066] (II) Module dbe: vendor="X.Org Foundation" [ 22.066] compiled for 1.12.2, module version = 1.0.0 [ 22.066] Module class: X.Org Server Extension [ 22.066] ABI class: X.Org Server Extension, version 6.0 [ 22.066] (II) Loading extension DOUBLE-BUFFER [ 22.066] (II) LoadModule: "record" [ 22.066] (II) Loading /usr/lib/xorg/modules/extensions/librecord.so [ 22.077] (II) Module record: vendor="X.Org Foundation" [ 22.077] compiled for 1.12.2, module version = 1.13.0 [ 22.077] Module class: X.Org Server Extension [ 22.077] ABI class: X.Org Server Extension, version 6.0 [ 22.077] (II) Loading extension RECORD [ 22.077] (II) LoadModule: "dri" [ 22.077] (II) Loading /usr/lib/xorg/modules/extensions/libdri.so [ 22.082] (II) Module dri: vendor="X.Org Foundation" [ 22.082] compiled for 1.12.2, module version = 1.0.0 [ 22.082] ABI class: X.Org Server Extension, version 6.0 [ 22.082] (II) Loading extension XFree86-DRI [ 22.082] (II) LoadModule: "dri2" [ 22.082] (II) Loading /usr/lib/xorg/modules/extensions/libdri2.so [ 22.083] (II) Module dri2: vendor="X.Org Foundation" [ 22.083] compiled for 1.12.2, module version = 1.2.0 [ 22.083] ABI class: X.Org Server Extension, version 6.0 [ 22.083] (II) Loading extension DRI2 [ 22.083] (II) LoadModule: "fglrx" [ 22.083] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/drivers/fglrx_dr [ 22.399] (II) Module fglrx: vendor="FireGL - ATI Technologies Inc." [ 22.399] compiled for 1.4.99.906, module version = 8.96.4 [ 22.399] Module class: X.Org Video Driver [ 22.399] (II) Loading sub module "fglrxdrm" [ 22.399] (II) LoadModule: "fglrxdrm" [ 22.399] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/linux/libfglrxdr [ 22.445] (II) Module fglrxdrm: vendor="FireGL - ATI Technologies Inc." [ 22.445] compiled for 1.4.99.906, module version = 8.96.4 [ 22.445] (II) ATI Proprietary Linux Driver Version Identifier:8.96.4 [ 22.445] (II) ATI Proprietary Linux Driver Release Identifier: 8.96.7 [ 22.445] (II) ATI Proprietary Linux Driver Build Date: Mar 12 2012 13:06:50 [ 22.445] (++) using VT number 7 [ 22.445] (WW) Falling back to old probe method for fglrx [ 23.043] (II) Loading PCS database from /etc/ati/amdpcsdb [ 23.082] (--) Chipset Supported AMD Graphics Processor (0x6898) found [ 23.107] (WW) fglrx: No matching Device section for instance (BusID PCI:0@1:0:1) found [ 23.107] (II) fglrx: intel VGA device detected, load intel driver. [ 23.107] (II) LoadModule: "intel" [ 23.211] (II) Loading /usr/lib/xorg/modules/drivers/intel_drv.so [ 23.475] (II) Module intel: vendor="X.Org Foundation" [ 23.475] compiled for 1.12.2, module version = 2.19.0 [ 23.475] Module class: X.Org Video Driver [ 23.475] ABI class: X.Org Video Driver, version 12.0 [ 23.476] ukiDynamicMajor: found major device number 249 [ 23.476] ukiDynamicMajor: found major device number 249 [ 23.476] ukiOpenByBusid: Searching for BusID PCI:1:0:0 [ 23.476] ukiOpenDevice: node name is /dev/ati/card0 [ 23.476] ukiOpenDevice: open result is 8, (OK) [ 23.476] ukiOpenByBusid: ukiOpenMinor returns 8 [ 23.476] ukiOpenByBusid: ukiGetBusid reports PCI:1:0:0 [ 23.540] (WW) PowerXpress feature is not supported [ 23.540] (EE) No devices detected. [ 23.540] (==) Matched intel as autoconfigured driver 0 [ 23.540] (==) Matched vesa as autoconfigured driver 1 [ 23.540] (==) Matched fbdev as autoconfigured driver 2 [ 23.540] (==) Assigned the driver to the xf86ConfigLayout [ 23.540] (II) LoadModule: "intel" [ 23.540] (II) Loading /usr/lib/xorg/modules/drivers/intel_drv.so [ 23.540] (II) Module intel: vendor="X.Org Foundation" [ 23.540] compiled for 1.12.2, module version = 2.19.0 [ 23.540] Module class: X.Org Video Driver [ 23.540] ABI class: X.Org Video Driver, version 12.0 [ 23.540] (II) UnloadModule: "intel" [ 23.540] (II) Unloading intel [ 23.540] (II) Failed to load module "intel" (already loaded, 32522) [ 23.540] (II) LoadModule: "vesa" [ 23.583] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so [ 23.620] (II) Module vesa: vendor="X.Org Foundation" [ 23.620] compiled for 1.12.2, module version = 2.3.1 [ 23.620] Module class: X.Org Video Driver [ 23.620] ABI class: X.Org Video Driver, version 12.0 [ 23.620] (II) LoadModule: "fbdev" [ 23.620] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so [ 23.661] (II) Module fbdev: vendor="X.Org Foundation" [ 23.661] compiled for 1.12.2, module version = 0.4.2 [ 23.661] Module class: X.Org Video Driver [ 23.661] ABI class: X.Org Video Driver, version 12.0 [ 23.661] (II) ATI Proprietary Linux Driver Version Identifier:8.96.4 [ 23.661] (II) ATI Proprietary Linux Driver Release Identifier: 8.96.7 [ 23.661] (II) ATI Proprietary Linux Driver Build Date: Mar 12 2012 13:06:50 [ 23.661] (II) intel: Driver for Intel Integrated Graphics Chipsets: i810, i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G, 915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM, Pineview G, 965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33, GM45, 4 Series, G45/G43, Q45/Q43, G41, B43, B43, Clarkdale, Arrandale, Sandybridge Desktop (GT1), Sandybridge Desktop (GT2), Sandybridge Desktop (GT2+), Sandybridge Mobile (GT1), Sandybridge Mobile (GT2), Sandybridge Mobile (GT2+), Sandybridge Server, Ivybridge Mobile (GT1), Ivybridge Mobile (GT2), Ivybridge Desktop (GT1), Ivybridge Desktop (GT2), Ivybridge Server, Ivybridge Server (GT2) [ 23.661] (II) VESA: driver for VESA chipsets: vesa [ 23.661] (II) FBDEV: driver for framebuffer: fbdev [ 23.661] (++) using VT number 7 [ 23.661] (WW) xf86OpenConsole: setpgid failed: Operation not permitted [ 23.661] (WW) xf86OpenConsole: setsid failed: Operation not permitted [ 23.661] (WW) Falling back to old probe method for fglrx [ 23.661] (II) Loading PCS database from /etc/ati/amdpcsdb [ 23.661] (WW) Falling back to old probe method for vesa [ 23.661] (WW) Falling back to old probe method for fbdev [ 23.661] (EE) No devices detected. [ 23.661] Fatal server error: [ 23.661] no screens found [ 23.661] Please consult the The X.Org Foundation support at http://wiki.x.org for help. [ 23.661] Please also check the log file at "/var/log/Xorg.0.log" for additional information. [ 23.661] xorg.conf: cat /etc/X11/xorg.conf Section "ServerLayout" Identifier "aticonfig Layout" Screen 0 "aticonfig-Screen[0]-0" 0 0 EndSection Section "Module" Load "glx" EndSection Section "Monitor" Identifier "aticonfig-Monitor[0]-0" Option "VendorName" "ATI Proprietary Driver" Option "ModelName" "Generic Autodetecting Monitor" Option "DPMS" "true" EndSection Section "Device" Identifier "aticonfig-Device[0]-0" Driver "fglrx" BusID "PCI:1:0:0" EndSection Section "Screen" Identifier "aticonfig-Screen[0]-0" Device "aticonfig-Device[0]-0" Monitor "aticonfig-Monitor[0]-0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection Is there a way to get the Radeon to work in a hybrid configuration or to use the Radeon as an OpenCL only device?

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• When module calling gets ugly

  - by Pete

  Has this ever happened to you? You've got a suite of well designed, single-responsibility modules, covered by unit tests. In any higher-level function you code, you are (95% of the code) simply taking output from one module and passing it as input to the next. Then, you notice this higher-level function has turned into a 100+ line script with multiple responsibilities. Here is the problem. It is difficult (impossible) to test that script. At least, it seems so. Do you agree? In my current project, all of the bugs came from this script. Further detail: each script represents a unique solution, or algorithm, formed by using different modules in different ways. Question: how can you remedy this situation? Knee-jerk answer: break the script up into single-responsibility modules. Comment on knee-jerk answer: it already is! Best answer I can come up with so far: create higher-level connector objects which "wire" modules together in particular ways (take output from one module, feed it as input to another module). Thus if our script was: FooInput fooIn = new FooInput(1, 2); FooOutput fooOutput = fooModule(fooIn); Double runtimevalue = getsomething(fooOutput.whatever); BarInput barIn = new BarInput( runtimevalue, fooOutput.someOtherValue); BarOutput barOut = barModule(BarIn); It would become with a connector: FooBarConnectionAlgo fooBarConnector = new fooBarConnector(fooModule, barModule); FooInput fooIn = new FooInput(1, 2); BarOutput barOut = fooBarConnector(fooIn); So the advantage is, besides hiding some code and making things clearer, we can test FooBarConnectionAlgo. I'm sure this situation comes up a lot. What do you do?

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• python packaging causes importerror

  - by Absolute0

  I am getting an annoying import error when I try to import a variable in an init.py file. I have attached the files involved and my directory structure: #/home/me/app/app/__init__.py from flaskext.sqlalchemy import SQLAlchemy db = SQLAlchemy(app) #/home/me/app/app/models/__init__.py from datetime import datetime from app import db #shell [me@archlinux app]$ pwd /home/me/app [me@archlinux app]$ ./manage.py /home/me/app/app/__init__.pyc Traceback (most recent call last): File "./manage.py", line 7, in <module> from app import app File "/home/me/app/app/__init__.py", line 3, in <module> from app.views.post import post File "/home/me/app/app/views/post.py", line 4, in <module> from app.models import Post File "/home/me/app/app/models/__init__.py", line 5, in <module> from app import db ImportError: cannot import name db [me@archlinux app]$ tree . +-- apikey.txt +-- manage.py +-- app ¦   +-- forms ¦   ¦   +-- __init__.py ¦   ¦   +-- __init__.py~ ¦   +-- __init__.py ¦   +-- __init__.py~ ¦   +-- __init__.pyc ¦   +-- models ¦   ¦   +-- __init__.py ¦   ¦   +-- __init__.py~ ¦   ¦   +-- __init__.pyc ¦   +-- static ¦   ¦   +-- css ¦   ¦   ¦   +-- style.css ¦   ¦   +-- images ¦   ¦   ¦   +-- favicon.png ¦   ¦   ¦   +-- logo.png ¦   ¦   ¦   +-- text_logo.png ¦   ¦   ¦   +-- thumb_down_active.png ¦   ¦   ¦   +-- thumb_down_inactive.png ¦   ¦   ¦   +-- thumb_up_active.png ¦   ¦   ¦   +-- thumb_up_inactive.png ¦   ¦   +-- js ¦   ¦   ¦   +-- index.js ¦   ¦   +-- sitemap.xml ¦   +-- templates ¦   ¦   +-- 404.html ¦   ¦   +-- 500.html ¦   ¦   +-- about.html ¦   ¦   +-- base.html ¦   ¦   +-- feedback ¦   ¦   ¦   +-- feedback_form.html ¦   ¦   +-- form.html ¦   ¦   +-- posts ¦   ¦   ¦   +-- comment.html ¦   ¦   ¦   +-- post.html ¦   ¦   ¦   +-- posts.html ¦   ¦   +-- spam.html ¦   ¦   +-- terms.html ¦   ¦   +-- users ¦   ¦   +-- login_form.html ¦   ¦   +-- sign_up_form.html ¦   +-- util ¦   ¦   +-- forms.py ¦   ¦   +-- honeypot.py ¦   ¦   +-- __init__.py ¦   ¦   +-- __init__.py~ ¦   ¦   +-- json_http.py ¦   ¦   +-- models.py ¦   ¦   +-- spam.py ¦   +-- views ¦   +-- feedback.py ¦   +-- __init__.py ¦   +-- __init__.pyc ¦   +-- post.py ¦   +-- post.pyc ¦   +-- user.py +-- settings.py +-- settings.pyc +-- TiddlyWiki.html 13 directories, 49 files What might be the problem?

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• How to create and administer multi-architecture PPAs?

  - by maxschlepzig

  I have a program that needs to be recompiled for every ubuntu version. Currently I am packaging it using Ubuntu's PPA just for the current distribution. Eventually, I have to provide packages for the previous ubuntu version. I am not sure how to accomplish this. How does the Ubuntu PPA build server works - does it just look at the distribution field in the most current changelog entry (in the debian/changelog file) to determine for what distribution the package should be build? The debian specification allows to add multiple distributions into the distribution field. But this does not seam to help me. Some ubuntu documents talk about encoding the distribution name into the version number (in the debian changelog file). But how does this work in practice? A new version of the program is available, then what? Do I add for each distribution a new changelog entry and the PPA buildserver builds automatically for each distribution new packages after dput'ing it up? Or does the PPA buildserver just looks at the first changelog entry?

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