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• Convert IplImage into a JPEG without using CvSaveImage in OpenCV

  - by Abhishek Mishra

  I wish to convert an IplImage into a JPEG image in the memory (in order to stream it as M-JPEG frame over sockets) . I know I can use CvSaveImage for this, that creates a jpeg file, I read it again and then stream it over the network. I wish to avoid this extra disk write-read ops for faster operation. Any insights ?

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• Creating cross platform applications

  - by Anant

  I have a fair bit of knowledge of Java and C#.NET (prefer C#). What should I use to create small applications that will work well in Windows, Mac and Linux? Speed will probably not be the main concern (small applications; using Sockets etc).

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• Cannot run a VM with more than three network interfaces with KVM

  - by Bostonvaulter

  I'm running KVM on top of Ubuntu 10.10 Server I can create VM's (Virtual Machine) and network interfaces fine but I cannot seem to add more than three network interfaces. As soon as I have a VM with four network interfaces it gets stuck on startup at the starting SeaBIOS page with this message: Starting SeaBIOS (version pre-0.6.1-20100702_143500-palmer) So far I've verified this with two VM's, a Ubuntu 10.10 desktop and a Vyatta router. The specific network hardware I assign to the VM's doesn't seem to matter. I'm trying to have one bridged interface and three private networks using Vyatta to route between them. Does anyone know why I can't run a VM with more than three network interfaces? Edit: Additionally the KVM thread responsible for the specific VM hangs using ~100% CPU (i.e. one core). Here's the command for the process that is hanging: /usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 512 -smp 1,sockets=1,cores=1,threads=1 -name vyatta -uuid 6dff7c94-6810-423e-5fea-fec10da0e9b7 -nodefaults -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/vyatta.monitor,server,nowait -mon chardev=monitor,mode=readline -rtc base=utc -boot c -drive file=/home/rams/virtual-machines/vyatta.img,if=none,id=drive-ide0-0-0,boot=on,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -device rtl8139,vlan=0,id=net0,mac=00:54:00:be:cc:4b,bus=pci.0,addr=0x3 -net tap,fd=97,vlan=0,name=hostnet0 -device rtl8139,vlan=1,id=net1,mac=52:54:00:da:59:ed,bus=pci.0,addr=0x5 -net tap,fd=98,vlan=1,name=hostnet1 -device rtl8139,vlan=2,id=net2,mac=52:54:00:ce:22:b6,bus=pci.0,addr=0x6 -net tap,fd=99,vlan=2,name=hostnet2 -device rtl8139,vlan=3,id=net3,mac=52:54:00:1e:bc:46,bus=pci.0,addr=0x7 -net tap,fd=101,vlan=3,name=hostnet3 -chardev pty,id=serial0 -device isa-serial,chardev=serial0 -usb -vnc 127.0.0.1:0 -k en-us -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 Edit: I've also found an error in dmesg that might be related (it also shows up when running virtd in verbose mode): 14:47:24.399: warning : qemudParsePCIDeviceStrs:1422 : Unexpected exit status '1', qemu probably failed I've also tried disabling app armor but that doesn't seem to make a difference.

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• Network communication across two private network

  - by Sethu

  Hi All, I am trying to implement a peer to peer communication .. I use sockets for communication between them. I want to know if there are any ways i can use the same sort of communication when the two peers are behind two private Networks (They dont know each others public ip address.) I can think of a shared buffer in a well known location as a means of communication. But is there some other way to get this done?

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• mounting VMDK images on opensolaris

  - by Bjorn Harpe

  I know that VMware ships a vmware-mount utility with its server 2 packages on Linux that allow you to mount a VMDK outside a vm and treat it as a normal filesystem mounted on the given mountpoint. Is there a method for accomplishing something similar in OpenSolaris that does not require converting to a raw image and then back?

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• libvirt qemu/kvm migration problem

  - by Panda

  I am using kvm and libvirt on my Dell server. Now i am trying to migrate one virtual machine from a physical server to another. However, I failed everytime. In virsh on physicalServer1, I typed: virsh # migrate virtualmachine1 qemu+ssh://username@physicalServer2/system error: operation failed: migration to 'tcp:physicalServer2:49163' failed: migration failed Then I searched FAQ part on libvirt.org. It says: error: operation failed: migration to '...' failed: migration failed This is an error often encountered when trying to migrate with QEMU/KVM. This typically happens with plain migration, when the source VM cannot connect to the destination host. You will want to make sure your hosts are properly configured for migration (see the migration section of this FAQ) I managed to ssh physicalServer2 from a shell on virtualmachine1 so the above red part did not explain my failure. I also open ports on physicalServer2, iptables -L shows following information: Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT udp -- anywhere anywhere udp dpt:bootps ACCEPT tcp -- anywhere anywhere tcp dpt:bootps ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT udp -- anywhere anywhere udp dpt:bootps ACCEPT tcp -- anywhere anywhere tcp dpt:bootps ACCEPT tcp -- anywhere anywhere state NEW tcp dpts:49152:49215 Chain FORWARD (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere 192.168.122.0/24 state RELATED,ESTABLISHED ACCEPT all -- 192.168.122.0/24 anywhere ACCEPT all -- anywhere anywhere REJECT all -- anywhere anywhere reject-with icmp-port-unreachable REJECT all -- anywhere anywhere reject-with icmp-port-unreachable ACCEPT all -- anywhere 192.168.122.0/24 state RELATED,ESTABLISHED ACCEPT all -- 192.168.122.0/24 anywhere ACCEPT all -- anywhere anywhere REJECT all -- anywhere anywhere reject-with icmp-port-unreachable REJECT all -- anywhere anywhere reject-with icmp-port-unreachable Chain OUTPUT (policy ACCEPT) target prot opt source destination The /var/log/libvirt/qemu/virtualmachine1.log on physicalServer2: 2011-05-06 13:37:30.708: starting up LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/kvm -S -M pc-0.14 -enable-kvm -m 2048 -smp 1,sockets=1,cores=1,threads=1 -name openjudge-test -uuid a8c704bc-a4f9-90db-3e57-40e60b00aac1 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/virtualmachine1.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=readline -rtc base=utc -boot c -drive file=/media/nfs/virtualmachine1.img,if=none,id=drive-ide0-0-0,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=20,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=00:16:36:8a:22 :a0,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -vnc 127.0.0.1:2 -vga cirrus -incoming tcp:0.0.0.0:49163 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 char device redirected to /dev/pts/0 2011-05-06 13:37:30.915: shutting down The /var/log/libvirt/qemu/virtualmachine1.log on physicalServer1 is empty. Both physical servers are using Ubuntu 11.04. The libvirt and kvm used are installed by apt-get. The libvirt version is 0.8.8.

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• Nagios Statistics for Notifications/Alerts

  - by bread555

  We have had our Nagios installation up for a year, and we are now required to give some statistics on how much it has worked and what it has done in the environment. As such, I was wondering if anyone knows if Nagios also holds data records on how many alerts and notifications it sends out? I am not necessarily looking for reports on what it alerted on, but just some raw statistics for a powerpoint. TL:DR Can I extract how many notifications and alerts Nagios has produced in it's existence or between certain dates?

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• How to format new HDD windows XP

  - by c0mrade

  I just bought new SATA 1TB Baracuda HDD, I inserted and my windows didn't recognize it. Because I didn't have any other OS or anything to format it I used Centos i386 installation to format it. I of course disconnected my original disk from the motherboard and formatted it using CENTOS.. but now when I come back to the windows I can't format this HDD. Its recognized as RAW. What can I do to make it work?

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• How to format new HDD windows XP

  - by c0mrade

  I just bought new SATA 1TB Baracuda HDD, I inserted and my windows didn't recognize it. Because I didn't have any other OS or anything to format it I used Centos i386 installation to format it. I of course disconnected my original disk from the motherboard and formatted it using CENTOS.. but now when I come back to the windows I can't format this HDD. Its recognized as RAW. What can I do to make it work?

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• optimizing operating systems to provide maximum informix performance.

  - by Frank Developer

  Are there any Informix-specific guides for optimizing any operating system where an ifx engine is running? For example, in Linux, strip-down to a bare minimum all unecessary binaries, daemons, utilities, tune kernel parameters, optimize raw and cooked devices (hdparm). Someday, maybe, informix can create its own proprietary PICK-like O/S. The general idea is for the OS where ifx sits on have the smallest footprint, lowest overhead impact on ifx and provide optimized ifx performance.

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• Printing to a Windows 7 incompatible printer shared on supported Windows XP machine

  - by MGSoto

  I have an HP Laserjet 1500 that is supported by Windows XP, but not supported by Windows-7. I want to print from my 7 machine(s) to my XP machine on this printer. Is there some sort of way to send a generic job (like sending raw postscript or something) to the XP machine, which will then print it with the proper drivers? Is there a virtual printer that has drivers for both XP and 7 that will just re-print it on the XP machine using the real printer?

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• Examples for Winsock?

  - by bobber205

  What do you guys recommend for a resource for winsock? I have an assignment that we have only have a few days to do that needs to send a simple packet using UDP (and receive the same type of packet). I am fairly familiar with C# sockets but nothing with C++. Any tips or resources?

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• Parsing xml files locally from assets folder using XmlPullParser

  - by Randolphg

  Im trying to parse a local xml file that I place in my assets folder. I've been trying to do this for almost a week now. Here is my test xml file Test1 Test2 Test3 Test4 Test5 I keep getting the same error: W/System.err(22458): org.xmlpull.v1.XmlPullParserException: unexpected type (position:TEXT Code: public void xmlParser() throws XmlPullParserException, IOException, ParserConfigurationException, SAXException { Log.d("tag", "xmlParsing...."); Arithmetic arthm = new Arithmetic(); XmlPullParserFactory xmlPF = XmlPullParserFactory.newInstance(); xmlPF.setValidating(false); XmlPullParser xml = xmlPF.newPullParser(); InputStream raw = getApplication().getAssets().open("menu.xml"); xml.setInput(raw, null); xml.nextTag(); Log.d("tag", "start parsing...."); String elementText = null; String elemName = null; int nofTags = 0; while (xml.getEventType() != XmlPullParser.END_DOCUMENT) { Log.d("tag", "while(xml.next)..."); switch (xml.getEventType()) { case XmlPullParser.START_DOCUMENT: Log.d("tag", "while (xml.getEventType() != XmlPullParser.END_DOCUMENT)"); break; case XmlPullParser.START_TAG: Log.d("tag", " case XmlPullParser.START_TAG"); elementText = xml.getName(); Log.d("tag", "elementText = " + elementText); if (xml.getEventType() != XmlPullParser.END_TAG) { xml.nextTag(); } break; case XmlPullParser.TEXT: Log.d("tag", "case TEXT"); if (elementText.equals("menu") && xml.isWhitespace()) { Log.d("tag", "<" + elementText + ">"); arthm.menu_name = xml.getText(); Log.d("tag", "value " + xml.getText() + " added"); } else if (elementText.equals("item")) { arthm.description = xml.getText(); Log.d("tag", "value " + xml.getText() + " added"); } else if (elementText.equals("SUBCATEGORY NAME")) { arthm.subcategoryDesc.add(xml.getText()); Log.d("tag", "value " + xml.getText() + " added"); } else if (elementText.equals("SUBCATEGORY DESC")) { arthm.subcategoryName.add(xml.getText()); Log.d("tag", "value " + xml.getText() + " added"); } break; case XmlPullParser.END_TAG: Log.d("tag", "case END_TAG"); nofTags += 1; String tags = Integer.toString(nofTags); Log.d("tags", elementText + " number of tags" + tags); if (xml.nextTag() != XmlPullParser.START_TAG) { xml.next(); } break; case XmlPullParser.END_DOCUMENT: Log.d("tag", "case END_DOCUMENT"); break; default: break; } } Log.d("tag", "Success!"); } Thanks in advance.

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• Windows 7 playback of dvr-Microsoft files stutters

  - by Jim Lynn

  I've just had to install Windows 7 on my Media Center machine because my Vista installation had a faulty drive. I've got the latest drivers that I can find - Intel 945GM integrated Graphics, Realtek audio drivers. Things are working OK with one exception. Playback of old recordings, from dvr-Microsoft format files, is choppy. The picture freezes for a fraction of a second, then quickly catches up. The sound is uninterrupted and doesn't pause. These freezes happen once every 5 seconds or so. It's very regular. Playback of Live TV from the digital tuner is perfectly smooth. DVD playback is perfectly smooth. As an experiment, I used the MPEG editing package VideoReDo to create a small test file in three different formats. This program takes the raw MPEG streams and repackages them into the desired container. I took the same clip and created three files in three formats: dvr-Microsoft (Microsoft's old recorded TV format); mpg (standard MPEG); and ts (raw MPEG transport stream of the kind often produced by PVRs). When these three files are played back under Windows 7, the mpg and ts files play smoothly, but the dvr-Microsoft file stutters. The last piece of data I have is that two other Windows 7 machines can play back dvr-Microsoft files smoothly with no stuttering. One is a netbook, with less grunt than the media centre. So there must be something specific about my Media Center machine that's causing the problem. Does anyone have any idea where I can look now? I don't know much about AV software, codecs, filter graphs etc. but I suspect that's where the problem lies. Rendering the video isn't the problem, but extracting the streams is. How would I go about diagnosing the problem? Edited to add: I just used the GraphStudio tool to look at the filter graph on the offending PC. The filter graph it uses by default for dvr-Microsoft looks identical to the other machines, and, interestingly, when I play the files using GraphStudio they run smoothly. Under Windows Media Player and Windows Media Center they stutter. I'd like to see the filter graph for Windows Media Player but GraphStudio won't show it. It looks like Windows Media Player and WMC are using a different decoding path to GraphStudio. Edited again to add: Today I purchased a new HDTV. The same Media Center driving the TV at 1080p is now playing back the old Recorded TV files smoothly, without stuttering. So whatever the cause of the original problem, using a different resolution seems to have removed the problem. It might also explain why nobody else has had this problem. I doubt many people use Media Centre with a 14in portable TV.

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• Amazon S3 tools for Debian?

  - by Jonik

  I need to (programmatically, in a shell script) upload an EAR file to an Amazon S3 bucket on Debian (5.0.4). What, if any, Debian package provides simple, scriptable tools for that? (I want raw S3 bucket access, so please don't suggest solutions like Jungle Disk.)

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• network endpoint accessible via hostname only, not address?

  - by Dustin Getz

  someone told me that this piece of network hardware (NAS) has a security setting such that it can only be accessed by hostname, not by IP address. I don't understand, as I thought DNS resolved the hostname to an address on the connecting client's side, then at protocol level always used the raw address, so how can this 'security' measure be possible?

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• ViewPager cycle between views?

  - by Erdem Azakli

  I want my ViewPager implementation to cycle between views instead of stopping at the last view. For example, if I have 3 views to display via a ViewPager, it should return back to the first View after the third View on fling instead of stopping at that third view. I want it to return to the first page/view when the user flings forward on the last page Thanks, Mypageradapter; package com.example.pictures; import android.content.Context; import android.media.AudioManager; import android.os.Parcelable; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.view.LayoutInflater; import android.view.View; public class MyPagerAdapter extends PagerAdapter{ SoundManager snd; int sound1,sound2,sound3; boolean loaded = false; public int getCount() { return 6; } public Object instantiateItem(View collection, int position) { View view=null; LayoutInflater inflater = (LayoutInflater) collection.getContext() .getSystemService(Context.LAYOUT_INFLATER_SERVICE); this.setVolumeControlStream(AudioManager.STREAM_MUSIC); int resId = 0; switch (position) { case 0: resId = R.layout.picture1; view = inflater.inflate(resId, null); break; case 1: resId = R.layout.picture2; view = inflater.inflate(resId, null); break; case 2: resId = R.layout.picture3; view = inflater.inflate(resId, null); break; case 3: resId = R.layout.picture4; view = inflater.inflate(resId, null); break; case 4: resId = R.layout.picture5; view = inflater.inflate(resId, null); break; case 5: resId = R.layout.picture6; view = inflater.inflate(resId, null); break; } ((ViewPager) collection).addView(view, 0); return view; } @SuppressWarnings("unused") private Context getApplicationContext() { // TODO Auto-generated method stub return null; } private void setVolumeControlStream(int streamMusic) { // TODO Auto-generated method stub } @SuppressWarnings("unused") private Context getBaseContext() { // TODO Auto-generated method stub return null; } @SuppressWarnings("unused") private PagerAdapter findViewById(int myfivepanelpager) { // TODO Auto-generated method stub return null; } @Override public void destroyItem(View arg0, int arg1, Object arg2) { ((ViewPager) arg0).removeView((View) arg2); } @Override public boolean isViewFromObject(View arg0, Object arg1) { return arg0 == ((View) arg1); } @Override public Parcelable saveState() { return null; } public static Integer getItem(int position) { // TODO Auto-generated method stub return null; } } OnPageChangeListener; package com.example.pictures; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.view.View; import android.widget.Button; import android.widget.Toast; public class Pictures extends Activity implements OnPageChangeListener{ SoundManager snd; int sound1,sound2,sound3; View view=null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.picturespage); MyPagerAdapter adapter = new MyPagerAdapter(); ViewPager myPager = (ViewPager) findViewById(R.id.myfivepanelpager); myPager.setAdapter(adapter); myPager.setCurrentItem(0); myPager.setOnPageChangeListener(this); snd = new SoundManager(this); sound1 = snd.load(R.raw.sound1); sound2 = snd.load(R.raw.sound2); sound3 = snd.load(R.raw.sound3); } public void onPageScrollStateChanged(int arg0) { // TODO Auto-generated method stub } public void onPageScrolled(int arg0, float arg1, int arg2) { // TODO Auto-generated method stub } public void onPageSelected(int position) { // TODO Auto-generated method stub switch (position) { case 0: snd.play(sound1); break; case 1: snd.play(sound2); break; case 2: snd.play(sound3); break; case 3: Toast.makeText(this, "1", Toast.LENGTH_SHORT).show(); break; case 4: Toast.makeText(this, "2", Toast.LENGTH_SHORT).show(); break; case 5: Toast.makeText(this, "3", Toast.LENGTH_SHORT).show(); break; } } };

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• MSN messenger buddy icon images

  - by Andy White

  Is it possible to access the raw image files for buddy icons in MSN messenger, somewhere on the file system? I have a buddy icon that I would like to use somewhere else, but I'm not sure how to get the actual file.

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• How to boot floppy image without floppy drive?

  - by Teddy

  Suppose I have a 1.44 MB floppy image with, say, a BIOS update, and a server with no floppy drive. How do I boot this image on the server? Without getting a USB floppy drive, that is. I tried copying the image to a USB drive (raw copy using dd), but it didn't boot, it just said "No kernel" and contiued booting on the HD.

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• Unable to start auditd

  - by George Reith

  I am on CentOS 5.8 final I recently installed auditd via yum install audit however I am unable to start it. I edited the configuration file to give a verbose output of the error it is recieving in starting up and this is the output: # service auditd start Starting auditd: Config file /etc/audit/auditd.conf opened for parsing log_file_parser called with: /var/log/audit/audit.log log_format_parser called with: RAW log_group_parser called with: root priority_boost_parser called with: 4 flush_parser called with: INCREMENTAL freq_parser called with: 20 num_logs_parser called with: 4 qos_parser called with: lossy dispatch_parser called with: /sbin/audispd name_format_parser called with: NONE max_log_size_parser called with: 5 max_log_size_action_parser called with: ROTATE space_left_parser called with: 75 space_action_parser called with: SYSLOG action_mail_acct_parser called with: root admin_space_left_parser called with: 50 admin_space_left_action_parser called with: SUSPEND disk_full_action_parser called with: SUSPEND disk_error_action_parser called with: SUSPEND tcp_listen_queue_parser called with: 5 tcp_max_per_addr_parser called with: 1 tcp_client_max_idle_parser called with: 0 enable_krb5_parser called with: no GSSAPI support is not enabled, ignoring value at line 30 krb5_principal_parser called with: auditd GSSAPI support is not enabled, ignoring value at line 31 Started dispatcher: /sbin/audispd pid: 3097 type=DAEMON_START msg=audit(1339336882.187:9205): auditd start, ver=1.8 format=raw kernel=2.6.32-042stab056.8 auid=4294967295 pid=3095 res=success config_manager init complete Error setting audit daemon pid (Connection refused) type=DAEMON_ABORT msg=audit(1339336882.189:9206): auditd error halt, auid=4294967295 pid=3095 res=failed Unable to set audit pid, exiting The audit daemon is exiting. Error setting audit daemon pid (Connection refused) [FAILED] The only information I can find online is that this may be due to SELinux, however SELinux is giving me problems of it's own. No matter what I do it appears to be disabled (I want to enable it). The configuration is set to enforced and the server has been rebooted many a time however sestatus still returns SELinux status: disabled. Can anyone shine some light on this problem? EDIT: I don't know if it is related but I noticed the following message appearing in my /var/log/messages Jun 10 16:25:22 s1 iscsid: iSCSI logger with pid=2056 started! Jun 10 16:25:22 s1 iscsid: Missing or Invalid version from /sys/module/scsi_transport_iscsi/version. Make sure a up to date scsi_transport_iscsi module is loaded and a up todate version of iscsid is running. Exiting... I try to start the iSCSI daemon myself (I have not a clue what it does; I am a linux newbie) and I get the following error: Starting iSCSI daemon: FATAL: Could not load /lib/modules/2.6.32-042stab056.8/modules.dep: No such file or directory FATAL: Could not load /lib/modules/2.6.32-042stab056.8/modules.dep: No such file or directory FATAL: Could not load /lib/modules/2.6.32-042stab056.8/modules.dep: No such file or directory FATAL: Could not load /lib/modules/2.6.32-042stab056.8/modules.dep: No such file or directory FATAL: Could not load /lib/modules/2.6.32-042stab056.8/modules.dep: No such file or directory [FAILED] If I go to /lib/modules/ I notice the directory exists but is completely empty.

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• Witch Java technology should be used to build client-server applicatoin on server side?

  - by Dimitry

  Hello, everyone) I'm new in Java world and I'm tottaly confused with numbers of java server-side technology. I need to build application with Java on server side and Flex-AIR on client one. All communication between them must be on sockets and in AMF format. Can you please help me to choose right to technology to learn?

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• How to send a mail message using Indy's smtp server component?

  - by eKek0

  Since the demo given in http://www.indyproject.org/Sockets/Demos/index.EN.aspx only saves the received stream to a file, I don't know how to effectevely send that stream as a mail. Could anyone teach me how to do this or to point me some more complete example?

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• Free POP3 .NET library?

  - by Shawn Simon

  Looking for a POP3 Client for .NET that basically just lets me log into a server and grab all the emails out, and maybe send some. I grabbed Indy.Sockets off of CodePlex and got it running but its throwing errors trying to decode the mail headers. Really anything is fine if it works.

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• Socket throughput on localhost?

  - by gct

  I've got an app that's using sockets to push data, and I'm currently testing it on my localhost (so that the sender and receiver are on the same computer). I'm seeing between 36 and 66MB/s of throughput, which seems somewhat slow to me. What are normal throughput ranges for binary data on a local socket connection?

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• Building NanoBSD inside a jail

  - by ptomli

  I'm trying to setup a jail to enable building a NanoBSD image. It's actually a jail on top of a NanoBSD install. The problem I have is that I'm unable to mount the md device in order to do the 'build image' part. Is it simply not possible to mount an md device inside a jail, or is there some other knob I need to twiddle? On the host /etc/rc.conf.local jail_enable="YES" jail_mount_enable="YES" jail_list="build" jail_set_hostname_allow="NO" jail_build_hostname="build.vm" jail_build_ip="192.168.0.100" jail_build_rootdir="/mnt/zpool0/jails/build/home" jail_build_devfs_enable="YES" jail_build_devfs_ruleset="devfsrules_jail_build" /etc/devfs.rules [devfsrules_jail_build=5] # nothing Inside the jail [root@build /usr/obj/nanobsd.PROLIANT_MICROSERVER]# sysctl security.jail security.jail.param.cpuset.id: 0 security.jail.param.host.hostid: 0 security.jail.param.host.hostuuid: 64 security.jail.param.host.domainname: 256 security.jail.param.host.hostname: 256 security.jail.param.children.max: 0 security.jail.param.children.cur: 0 security.jail.param.enforce_statfs: 0 security.jail.param.securelevel: 0 security.jail.param.path: 1024 security.jail.param.name: 256 security.jail.param.parent: 0 security.jail.param.jid: 0 security.jail.enforce_statfs: 1 security.jail.mount_allowed: 1 security.jail.chflags_allowed: 1 security.jail.allow_raw_sockets: 0 security.jail.sysvipc_allowed: 0 security.jail.socket_unixiproute_only: 1 security.jail.set_hostname_allowed: 0 security.jail.jail_max_af_ips: 255 security.jail.jailed: 1 [root@build /usr/obj/nanobsd.PROLIANT_MICROSERVER]# mdconfig -l md2 md0 md1 md0 and md1 are the ramdisks of the host. bsdlabel looks sensible [root@build /usr/obj/nanobsd.PROLIANT_MICROSERVER]# bsdlabel /dev/md2s1 # /dev/md2s1: 8 partitions: # size offset fstype [fsize bsize bps/cpg] a: 1012016 16 4.2BSD 0 0 0 c: 1012032 0 unused 0 0 # "raw" part, don't edit newfs runs ok [root@build /usr/obj/nanobsd.PROLIANT_MICROSERVER]# newfs -U /dev/md2s1a /dev/md2s1a: 494.1MB (1012016 sectors) block size 16384, fragment size 2048 using 4 cylinder groups of 123.55MB, 7907 blks, 15872 inodes. with soft updates super-block backups (for fsck -b #) at: 160, 253184, 506208, 759232 mount fails [root@build /usr/obj/nanobsd.PROLIANT_MICROSERVER]# mount /dev/md2s1a _.mnt/ mount: /dev/md2s1a : Operation not permitted UPDATE: One of my colleagues pointed out There are some file systems types that can't be securely mounted within a jail no matter what, like UFS, MSDOFS, EXTFS, XFS, REISERFS, NTFS, etc. because the user mounting it has access to raw storage and can corrupt it in a way that it will panic entire system. From http://www.mail-archive.com/[email protected]/msg160389.html So it seems that the standard nanobsd.sh won't run inside a jail while it uses the md device to build the image. One potential solution I'll try is to chroot from the host into the build jail, rather than jexec a shell.

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