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  • Resources for writing kernel in C

    - by anon
    I don't want to write my own boot loader -- happy to use Grub. I just want to implement pre-emptive multi threading, a basic file system, and virtual memory. I want something that can run on top of qemu. What's a good resource (book / tutorial) for accomplishing this goal? Thanks!

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  • For kernel/OS is C still it

    - by Recursion
    I like operating systems and would eventually like to become a OS developer mostly working on kernels. In the future will C still be the language of choice and what else should I be trying to learn.

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  • How should I configure grub for booting linux kernel from a USB hard drive?

    - by skolima
    I have a laptop hard drive in an external enclosure which I use as a large pendrive. For an added twist, I have installed Linux on it, so I can boot any machine with my distribution of choice (e.g. for data recovery or repairing a b0rked system or just using a borrowed laptop without destroying the preinstalled Windows). The problem is that, depending on the hardware configuration, the USB hard drive may be visible under different paths. For grub configuration I just use (hda0,0) as it is relative to the device the grub was launched from. I have UUID entries in /etc/fstab. I also specify rootwait in the kernel parameters so that it waits for the USB subsystem to settle down before trying to mount the device. What should I pass to the kernel as root= ? Currently boot from the pendrive once, check the debug messages to see what /dev/sdX device has been assigned to the USB drive by the kernel, then reboot and edit the grub configuration. I can't change anything on the PC besides enabling Boot from USB hard drive in BIOS and setting it to higher priority than internal hard drives. There are various initrd generating scripts which include support for UUID in root device path, unfortunately the Gentoo native one (genkernel) does not support rootwait and I had no luck trying to use others. The boot process goes like this (it is quite similar in Windows): The BIOS chooses the boot device and loads whatever is its MBR (which happens to be grub stage-1). Grub loads it's configuration and stage-2 files from device it has set as root, using (hd0) for the device it was loaded from by BIOS. Grub loads and starts a kernel (still the same numbering, so I can use (hd0,0) again ). Kernel initializes all built-in devices (rootwait does it's magic now). Kernel mounts the partition it was passed as root (this is a kernel parameter, not grub parameter). init.d starts the userland booting process, including mounting things from /etc/fstab. Part 5 is the one giving me problems.

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  • Cinnamon is broken after upgrade to 13.10

    - by user2306488
    I see reports of people with Unity broken after upgrading to 13.10. In my case Unity works fine but cinnamon is broken. It opens the startup applications but no window manager, no menus and the keyboad shortcuts won't work. As a consequence I can't even log out or shut down cleanly. The logs say: Oct 19 10:32:42 Aveline colord: Profile added: icc-1727cc5030c477b20ad75593e757248d Oct 19 10:32:43 Aveline gnome-session[9157]: WARNING: App 'cinnamon.desktop' exited with code 1 Oct 19 10:32:43 Aveline gnome-session[9157]: WARNING: App 'cinnamon.desktop' respawning too quickly Oct 19 10:32:43 Aveline gnome-session[9157]: CRITICAL: We failed, but the fail whale is dead. Sorry.... Oct 19 10:32:43 Aveline gnome-session[9157]: WARNING: App 'cinnamon.desktop' exited with code 1 Oct 19 10:32:46 Aveline whoopsie[1054]: online Oct 19 10:32:53 whoopsie[1054]: last message repeated 12 times Oct 19 10:32:53 Aveline kernel: [ 1982.637049] python[9626]: segfault at 1511 ip b6c9e850 sp bf8d0980 error 4 in libglib-2.0.so.0.3800.0[b6c5b000+102000] Oct 19 10:32:53 Aveline kernel: [ 1982.837527] python[9631]: segfault at 0 ip b6eb13fa sp b69ff848 error 6 in libdbus-1.so.3.7.4[b6e89000+49000] Oct 19 10:32:54 Aveline kernel: [ 1983.030271] python[9634]: segfault at a6f4098b ip b6e52389 sp bfcdad68 error 4 in libdbus-1.so.3.7.4[b6e34000+49000] Oct 19 10:32:54 Aveline kernel: [ 1983.253259] python[9639]: segfault at 4 ip b6e710f4 sp b69c1bfc error 6 in libdbus-1.so.3.7.4[b6e4b000+49000] Oct 19 10:32:54 Aveline kernel: [ 1983.501771] python[9642]: segfault at b4 ip b6e0f076 sp bf82524c error 4 in libdbus-1.so.3.7.4[b6dfd000+49000] Oct 19 10:32:54 Aveline kernel: [ 1983.721334] python[9647]: segfault at 4 ip b6eab0f4 sp b69fbbfc error 6 in libdbus-1.so.3.7.4[b6e85000+49000] Any idea?

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  • Unable to start VMWare Workstation after upgrade to 13.04

    - by pst007x
    After upgrading to 13.04 I am unable to start VMWorkstation. I get the following message: Before you can run VMware, several modules must be compiled and loaded into the running kernel. Kernel Headers 3.8.0-19-generic Kernel headers for version 3.8.0-19-generic were not found. If you have installed them in a non-default path you can specify the path below. Does anyone have any idea what to do next? Ubuntu 13.04 64bit If I direct the path to: /usr/src/linux-headers-3.8.0-19-generic I get the following message: C header files matching your running kernel were not found. Thanks Additional: As suggested I run this in terminal: cd /lib/modules/$(uname -r)/build/include/linux sudo ln -s ../generated/utsrelease.h sudo ln -s ../generated/autoconf.h sudo ln -s ../generated/uapi/linux/version.h However, now I get the following: Before you can run VMware, several modules must be compiled and loaded into the kernel CANCEL / INSTALL I INSTALL, the window closes and nothing happens.... Any ideas? ADDITIONAL: I installed this: sudo apt-get install open-vm-tools open-vm-tools-dev open-vm-dkms open-vm-toolbox open-vm-tools-dev And it all launched... Many thanks for the suggestions and help... This is what I love about Ubuntu... it has a great helpful community... ! Note: Also found this which may help others too: HERE ADDITIONAL ERROR: Could not open /dev/vmmon: Is a directory. Please make sure that the kernel module `vmmon' is loaded. Failed to initialize monitor device. Monitor settings all greyed out RESOLUTION: Re-installation of Nvidia Drivers

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  • How do I fix my ethernet card losing network connection every few minutes with kernels 3.8.x?

    - by igoryonya
    I'm using Ubuntu 13.04. My laptop is Acer Aspire one 722-c58rr, and my ethernet card works for a few seconds at a time with kernels 3.8.x, however, kernels 3.5.x and below worked fine. On kernels 3.8.x, it works fine after boot for about a minute, then it looses network connection. When pinging to some address, it says: network address is unreachable, but it can ping it's own address. The address is statically configured. Everything was working fine before. I went to vacation, where I used WiFi and 3G connections, so I didn't notice that the problem occurred. Came back home, plugged in into the ethernet. It worked for a minute then stopped. Rebooting commutator fixed the problem. Tried to connect to a different commutator, same problem. Unplugging and plugging the cable fixes the problem for another minute. Disconnecting eth in Network manager and reconnecting it again, does the same thing. WiFi has no such problem. Tried to use a different cable that works fine on another computer, the same problem. Tried to boot with the lower kernel version, the same problem was happening until I got to the version 3.5 of the kernel series. Everything works fine on the kernel 3.5.x, but I don't want to miss out on the new kernel's features. Executing commands, when booted with 3.8 kernel series, give the following results: lspci| grep -i eth: 06:00.0 Ethernet controller: Qualcomm Atheros AR8152 v2.0 Fast Ethernet (rev c1) dmesg| grep eth1: [ 89.548291] atl1c 0000:06:00.0: atl1c: eth1 NIC Link is Up How do I fix it, while staying in the new kernel version?

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  • Unable to install ZFS (Ubuntu 13.10)

    - by user209707
    I'm fairly new to Ubuntu and wanted to setup a server running ZFS/XBMC - The XBMC install went fine, however I ran into trouble getting ZFS working. Configuration : Ubuntu 13.10 (GNU/Linux 3.12.0-rc7+ x86_64) I attempted to install ZFS native using : sudo add-apt-repository ppa:zfs-native/stable sudo apt-get update sudo apt-get install ubuntu-zfs This failed to install due to "Module build for the currently running kernel was skipped since the kernel source for this kernel does not seem to be installed." Trying sudo modprobe zfs shows FATAL error : module not found. Here, they mentioned it was to do with lacking build dependences- I followed the answer which was to run sudo apt-get remove --purge ubuntu-zfs zfs-dkms zfsutils spl spl-dkms libzfs1 dkms Then, REBOOT. Then, do: sudo apt-get install linux-headers-generic build-essentia sudo apt-get install ubuntu-zfs " This leaves me in the same situation with "Building only for 3.12.0-rc7+ Module build for the currently running kernel was skipped since the kernel source for this kernel does not seem to be installed." when trying to install ubuntu-zfs. Trying sudo apt-get install --reinstall zfs-dkms also does not work.

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  • Strange error(dereferencing pointer to incomplete type)

    - by SMiX
    void get_cwd(char* buf) { char *result; current->fs->pwd; result = get_dentry_path(current->fs->pwd); memcpy(buf, result, strlen(result)+1); kfree(result); } error: dereferencing pointer to incomplete type The error points to current-fs-pwd; includes: #include <asm/stat.h> #include <linux/fs.h> #include <linux/file.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/dirent.h> #include <linux/sched.h> #include <asm/uaccess.h> #include <asm/current.h> #include <linux/path.h> If I type current-fs; on 5th line gcc don't give error on this line. The problem is with pwd field.

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  • Ubuntu hard disk problem

    - by Henadzy
    Hello! I have got the error with a hard disk on Ubuntu 9.10. It slows down my system, applications have not been responding for a long time. But when I mount and use filesystem which placed on this hard disk at other computer it works properly. disk: SAMSUNG HD161HJ (SATA) syslog: Apr 25 00:28:25 vare6gin kernel: [ 885.773839] ata3.00: exception Emask 0x1 SAct 0x1e SErr 0x0 action 0x6 frozen Apr 25 00:28:25 vare6gin kernel: [ 885.773845] ata3.00: Ata error. fis:0x21 Apr 25 00:28:25 vare6gin kernel: [ 885.773861] ata3.00: cmd 60/08:08:3f:00:ad/00:00:10:00:00/40 tag 1 ncq 4096 in Apr 25 00:28:25 vare6gin kernel: [ 885.773864] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773871] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773877] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773890] ata3.00: cmd 60/18:10:9f:6b:ed/00:00:0e:00:00/40 tag 2 ncq 12288 in Apr 25 00:28:25 vare6gin kernel: [ 885.773893] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773900] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773904] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773918] ata3.00: cmd 60/08:18:3f:5f:ed/00:00:0e:00:00/40 tag 3 ncq 4096 in Apr 25 00:28:25 vare6gin kernel: [ 885.773921] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773927] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773932] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773946] ata3.00: cmd 60/08:20:67:c8:91/00:00:05:00:00/40 tag 4 ncq 4096 in Apr 25 00:28:25 vare6gin kernel: [ 885.773948] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773955] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773960] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773970] ata3: hard resetting link Apr 25 00:28:25 vare6gin kernel: [ 885.773974] ata3: nv: skipping hardreset on occupied port Apr 25 00:28:25 vare6gin kernel: [ 886.240073] ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Apr 25 00:28:25 vare6gin kernel: [ 886.256277] ata3.00: configured for UDMA/133 Apr 25 00:28:25 vare6gin kernel: [ 886.256305] ata3: EH complete Apr 25 00:28:27 vare6gin kernel: [ 888.176088] ata3: EH in SWNCQ mode,QC:qc_active 0xF sactive 0xF Apr 25 00:28:27 vare6gin kernel: [ 888.176099] ata3: SWNCQ:qc_active 0xF defer_bits 0x0 last_issue_tag 0x3 Apr 25 00:28:27 vare6gin kernel: [ 888.176102] dhfis 0xF dmafis 0x1 sdbfis 0x0 Apr 25 00:28:27 vare6gin kernel: [ 888.176109] ata3: ATA_REG 0x51 ERR_REG 0x40 Apr 25 00:28:27 vare6gin kernel: [ 888.176113] ata3: tag : dhfis dmafis sdbfis sacitve Apr 25 00:28:27 vare6gin kernel: [ 888.176120] ata3: tag 0x0: 1 1 0 1 Apr 25 00:28:27 vare6gin kernel: [ 888.176126] ata3: tag 0x1: 1 0 0 1 Apr 25 00:28:27 vare6gin kernel: [ 888.176131] ata3: tag 0x2: 1 0 0 1 Apr 25 00:28:27 vare6gin kernel: [ 888.176136] ata3: tag 0x3: 1 0 0 1

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  • Is it important to reboot Linux after a kernel update?

    - by lfaraone
    I have a few production Fedora and Debian webservers that host our sites as well as user shell accounts (used for git vcs work, some screen+irssi sessions, etc). Occasionally a new kernel update will come down the pipeline in yum/apt-get, and I was wondering if most of the fixes are severe enough to warrant a reboot, or if I can apply the fixes sans reboot. Our main development server currently has 213 days of uptime, and I wasn't sure if it was insecure to run such an older kernel.

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  • conflicting info about the running kernel version in FreeBSD

    - by John
    I asked a related question about uname before, now want to ask from another angle because the following simple yet obvious conflicting outputs may mean there is something many people did not think of (me included). I'm running FreeBSD 9 RELEASE, please see the following commands: # sysctl kern.bootfile kern.bootfile: /boot/kernel/kernel # strings /boot/kernel/kernel |grep RELEASE|grep 9 @(#)FreeBSD 9.2-RELEASE-p7 #0: Tue Jun 3 11:05:13 UTC 2014 FreeBSD 9.2-RELEASE-p7 #0: Tue Jun 3 11:05:13 UTC 2014 9.2-RELEASE-p7 The above kernel file suggests the running kernel is 9.2-RELEASE-p7. But... # dmesg Copyright (c) 1992-2012 The FreeBSD Project. Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 The Regents of the University of California. All rights reserved. FreeBSD is a registered trademark of The FreeBSD Foundation. FreeBSD 9.1-RELEASE #0 r243825: Tue Dec 4 09:23:10 UTC 2012 ... # uname -a FreeBSD localhost.localdomain 9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243825: Tue Dec 4 09:23:10 UTC 2012 [email protected]:/usr/obj/usr/src/sys/GENERIC amd64 So dmesg and uname says it's 9.1-RELEASE. I also did an extensive find / -type f -exec grep -l "9.1-RELEASE" {} \; but found no possible kernel file that contains 9.1-RELEASE. What could lead to the above conflict, and what kernel I am actually running? Please note I run RELEASE and ran freebsd-update to do binary update, so no compiled kernel is involved. And I have rebooted multiple times after freebsd-update. And the system is not in jail etc, just the only system on that computer.

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  • can anyone reccommend a Google SERP tracker?

    - by Haroldo
    I want to track my website's position in Google's search results for around 50 keywords/phrases and am looking to a nice webapp/windows app to automate this process? Ideally i want to see pretty javscript or flash line graphs for my keyword/position. I'm currently free-trialing: Raven Tools and Sheer SEO but am not particularly impressed with either... I guess my budget is up to £25-30/$30-40 per month for a decent bit of software ps. i've tried asking this on SuperUser but it seems a bit webdeveloper-y...

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  • Can anyone recommend a Google SERP tracker?

    - by Haroldo
    I want to track my website's position in Google's search results for around 50 keywords/phrases and I am looking to a nice web service or Windows application to automate this process. Ideally, I want to see pretty Javascript or Flash line graphs for my keywords and their positions. I'm currently free-trialing Raven Tools and Sheer SEO but I am not particularly impressed with either. My budget is up to £25-30/$30-40 per month for a decent rank checker.

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  • How to manage an issue tracker's backlog

    - by Josh Kelley
    We've been dutifully using Trac for several years now, and our "active tickets" list has grown to almost 200 items. These include bugs that are too low priority and too complicated to fix for now, feature requests that have been deferred, issues that have never really generated complaints but everyone agrees ought to be fixed someday, planned code refactorings and other design infelicities that we don't want to lose track of, etc. As a result, with almost 200 of these issues, the list is almost overwhelming; it's no longer useful as a source of what needs to be worked on right now. What's the best way to keep track of issues of this sort? Part of the problem is that some of these issues are such a low priority that they may never get done. I hate to lose track of these items (similar to not wanting to throw something out of my house in case I might need it someday); do I need to throw them out regardless (by marking them as wontfix) and assume I can find them in the future if I ever do need them?

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  • Looking for a simple web interface with subversion support and ticket /issue tracker [closed]

    - by Stefan Andre Brannfjell
    I am working on a small project and we have a few programmers on the job. We are using subversion to commit updates and keep all developers up to date on their workstations. However, we have yet to find a suitable web interface to use for it. I have tried redmine, but that installation progress was extremely bothersome and advanced. Once I got it to work I found out that it was slow and did not meet my expectations. As well as it seems a bit complex for our needs. I would prefer to find a solution that supports lighttpd web server, however that seem to be very hard to come by, those I have found seem to only have apache support. Functionality i wish for the website: - login to an svn account - view svn logs - view & create issues, todo list etc - view svn difference Do you have any open source recommendations that I can try out? I will appreciate any kind of reply. :) Edit: I wish to host the website on our own servers.

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  • Project Time Tracker

    - by Geertjan
    Based on yesterday's blog entry, let's do something semi useful and display, in the project popup, which is available when you right-click a project in the Projects window, the time since the last change was made anywhere in the project, i.e., we can listen recursively to any changes done within a project and then update the popup with the newly acquired information, dynamically: import java.awt.event.ActionEvent; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Collection; import java.util.List; import javax.swing.AbstractAction; import org.netbeans.api.project.Project; import org.netbeans.api.project.ProjectUtils; import org.openide.awt.ActionID; import org.openide.awt.ActionReference; import org.openide.awt.ActionRegistration; import org.openide.awt.StatusDisplayer; import org.openide.filesystems.FileAttributeEvent; import org.openide.filesystems.FileChangeListener; import org.openide.filesystems.FileEvent; import org.openide.filesystems.FileRenameEvent; import org.openide.util.Lookup; import org.openide.util.LookupEvent; import org.openide.util.LookupListener; import org.openide.util.Utilities; import org.openide.util.WeakListeners; @ActionID( category = "Demo", id = "org.ptt.TrackProjectSelectionAction") @ActionRegistration( lazy = false, displayName = "NOT-USED") @ActionReference( path = "Projects/Actions", position = 0) public final class TrackProjectSelectionAction extends AbstractAction implements LookupListener, FileChangeListener { private Lookup.Result<Project> projects; private Project context; private Long startTime; private Long changedTime; private DateFormat formatter; private List<Project> timedProjects; public TrackProjectSelectionAction() { putValue("popupText", "Timer"); formatter = new SimpleDateFormat("HH:mm:ss"); timedProjects = new ArrayList<Project>(); projects = Utilities.actionsGlobalContext().lookupResult(Project.class); projects.addLookupListener( WeakListeners.create(LookupListener.class, this, projects)); resultChanged(new LookupEvent(projects)); } @Override public void resultChanged(LookupEvent le) { Collection<? extends Project> allProjects = projects.allInstances(); if (allProjects.size() == 1) { Project currentProject = allProjects.iterator().next(); if (!timedProjects.contains(currentProject)) { String currentProjectName = ProjectUtils.getInformation(currentProject).getDisplayName(); putValue("popupText", "Start Timer for Project: " + currentProjectName); StatusDisplayer.getDefault().setStatusText( "Current Project: " + currentProjectName); timedProjects.add(currentProject); context = currentProject; } } } @Override public void actionPerformed(ActionEvent e) { refresh(); } protected void refresh() { startTime = System.currentTimeMillis(); String formattedStartTime = formatter.format(startTime); putValue("popupText", "Timer started: " + formattedStartTime + " (" + ProjectUtils.getInformation(context).getDisplayName() + ")"); } @Override public void fileChanged(FileEvent fe) { changedTime = System.currentTimeMillis(); formatter = new SimpleDateFormat("mm:ss"); String formattedLapse = formatter.format(changedTime - startTime); putValue("popupText", "Time since last change: " + formattedLapse + " (" + ProjectUtils.getInformation(context).getDisplayName() + ")"); startTime = changedTime; } @Override public void fileFolderCreated(FileEvent fe) {} @Override public void fileDataCreated(FileEvent fe) {} @Override public void fileDeleted(FileEvent fe) {} @Override public void fileRenamed(FileRenameEvent fre) {} @Override public void fileAttributeChanged(FileAttributeEvent fae) {} } Some more work needs to be done to complete the above, i.e., for each project you somehow need to maintain the start time and last change and redisplay that whenever the user right-clicks the project.

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  • Tutoriel Windows Azure : Web Tracker, par l'équipe Azure de Microsoft

    Contoso dispose d'une application mobile et d'un site Web qui renvoient des informations d'utilisation. Une sonde (en JS depuis les pages HTML, en Objective-C sur iOS, en Java depuis Android, en C# depuis Windows Phone, en C# ou en JS depuis Windows 8+) envoie via HTTP POST ces informations d'usage en JSON à l'adresse http(s)://webtracker.contoso.com/t/. Le but de ce tutoriel est de montrer comment on peut mettre en ?uvre la réception de ces informations de sonde de façon à ce que cela puisse monter...

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  • Kernel Errors in logwatch

    - by Vince Pettit
    We have a dedicated server running CentOS and Plesk. We've had the following show up on our logwatch and wondered if it is anything we should worry about? --------------------- Kernel Begin ------------------------ WARNING: Kernel Errors Present Northbridge Error, node 1K8 ECC ...: 1 Time(s) ---------------------- Kernel End ------------------------- We've contacted the support team that we rent our server from but they don't seem to want to help us out without us paying their support team a fixed charge and even then they can't guarantee they would be able to find a solution to any potential problems. Full log lines regarding Kernel error... Jun 16 19:45:25 server88-208-217-241 kernel: Northbridge Error, node 1<0>K8 ECC error. Jun 16 19:45:25 server88-208-217-241 kernel: EDAC amd64 MC1: CE ERROR_ADDRESS= 0x2a3d553e0 Jun 16 19:45:25 server88-208-217-241 kernel: EDAC MC1: CE page 0x2a3d55, offset 0x3e0, grain 0, syndrome 0x5041, row 3, channel 0, label "": amd64_edac

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