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  • IPC in C under linux

    - by poly
    I'm building a messaging solution with the followingsetup: all the messages are saved on a DB, two or more reader processes will read from this DB and send data to other process(es) which will send it over the network. My approach is depicted below, The following have 4 sender process with 4 fifos, and 2 readers with 2 fifos reader0 ? read data from DB reader1 ? read data from DB sending part network_handler0 ? network_handler_fifo0 ? reader0 network_handler1 ? network_handler_fifo1 ? reader1 network_handler2 ? network_handler_fifo2 ? reader0 network_handler3 ? network_handler_fifo3 ? reader1 receiving part network_handler0 ? reader_fifo0 ? reader0 ? write to DB network_handler1 ? reader_fifo1 ? reader1 ? write to DB network_handler2 ? reader_fifo0 ? reader0 ? write to DB network_handler3 ? reader_fifo1 ? reader1 ? write to DB I have few problem with this setup, and please note that the number of processes could be more than that based on the environment, so I could make it 20 readers and 10 network_handlers or it it could as shown above. The size of the buffer is 64K and the message size is 200k, is this small enough to make the write/read to/from fifo atomic? How can make the processes aware of each other, so for example, reader 0 writes to network_handler_fifo0 and network_handler_fifo2, how can I make it start writing on other fifo if the current ones are full or their network_handlers are dea d I thought about making the reader process writing more general in writing, so for example it writes to all network fifos using lock mechanism and stop writing on the one that its process dead, I didn't use it as lock mechanism could slow thing down. BTW, each network_handler is an SCTP association, so network_handler0 is association 0, network_handler1 is association 1 and so on. Any idea is appreciated. I mean even if I have to change the setup above.

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  • 16 of the Best Free Linux Game Engines (Part 2 of 2)

    <b>LinuxLinks:</b> "Now, let's explore the 8 game engines at hand. For each engine we have compiled its own portal page, providing screenshots of it in action, a full description of the game engine, with an in-depth analysis of the features of the game engine, together with links to relevant resources and reviews."

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  • The authenticity of host “host” can't be established

    - by Candroid
    I'm running a web app on a Linux server which connects to other servers. When I run the project on my Play framework on loclhost it runs fluently. When I run it on my Linux server I get the above message 3 times, one for each server. I read a post about it where it says that it is a man in the middle warning and if I write yes it should work. But though a write yes, nothing happens and the app doesn't run, and the error message keeps popping up. I tried creating private and public keys and add them to the authorized_keys file, but it didn't work either. What should I so to run my app?

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  • Most computer users need Linux

    <b>Technology & Life Integration:</b> "One thing I have noticed on just about all windows installed computers outside of my strict control is that they are full of viruses, spyware and there are more programs installed than they know what to do with."

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  • How to switch users without entering password, part II

    - by torbengb
    I've got Ubuntu 9.10 with a user account for my wife, and one for myself. "Wake-from-screensaver" should result in "choose user" without having to enter any password. I know how to do that in Windows, but I'm not good with Linux (yet). Part of this was answered in this question which helped me get past the login screen without passwords (after booting, and after choosing "switch user"), but once the screensaver kicks in and I wake it up again, the system does not present the "choose user" screen. Instead, it either turns off the screensaver and presents the desktop of the most recent user, or (if the screensaver is set to lock the screen) prompt for the user's password (which can be handily surpassed by clicking the "switch user" button and choosing the same user again). So, the login ("choose user") screen has been dealt with. How do I make the (any) screensaver return to the login screen at wake, rather than to the current user's desktop? Windows can do this, I'm sure Linux can too - but how?

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  • Minitube, a YouTube Desktop Client for Linux

    <b>Tech Source:</b> "Do you want to watch YouTube videos in High-definition format without opening a web browser or without having the need to install Flash Player? If yes, then let me introduce you to a simple but capable YouTube desktop client called Minitube."

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  • Shortcut with arguments in Debian

    - by Duncan
    I have a volume on a debian server which contains a large number of images at full resolution in various folders. What I'd like to do is have a separate sort of browse proxy folder which contains lower quality browse copies of these to enable users to access them for viewing over lower speed dial in accounts. I'd ideally like these to be created on the fly using ImageMagick so there isnt the need to store the large number of browse copies full time and worry about keeping them up to date etc The way I'd invisaged this happening is the browse proxy folder containing a duplicate file and folder structure but with symlinks pointing to a script to transform them with the file path as an argument. Except I know this isnt possible with symlinks so am wondering if there's another way of doing this on linux. On windows shortcuts can take arguments and I'm wondering how to do the same on a Linux platform? (or perhaps I'm going about this the wrong way?)

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  • Hot-swapping drives

    - by user57770
    I have hot swap drives and controllers, but have never actually used the hot swap capability. What is the procedure for doing so? Do I need to warn Linux that I'm about to pull a drive out? Should I do anything after I put a drive back in? Does it make a difference whether the drive is part of a RAID set? The drives are generally RAIDed, but not always. Any RAID sets are managed by Linux, rather than the controller. The machines are running Fedora and CentOS.

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  • Kernel Log: Linux 2.6.34 goes into testing

    <b>The H Open:</b> "Improvements include graphics drivers for recent Radeon GPUs and for the graphics cores of some Intel processors that are only expected to be released early next year. Another new addition is the LogFS SSD file system."

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  • Dual-boot more than two operating systems

    - by aldorado
    I currently run Windows 7 and Ubuntu 12.04 as a dual-boot system. I need Linux, but Ubuntu freezes at least once a day. So I want to replace it with another distribution like Debian or LMDE. On the other hand I am a little concerned that I'll have troubles working with a less user friendly operating system than Ubuntu. So would it be possible to just scale down the Windows partition and install the next Linux as a third system? Thus, with a "triple-boot system" I could keep Ubuntu until I feel familiar with the new system. Afterwards, I guess, it should be possible to replace the Ubuntu partition by expanding the new system?

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  • SYN receives RST,ACK very frequently

    - by user1289508
    Hi Socket Programming experts, I am writing a proxy server on Linux for SQL Database server running on Windows. The proxy is coded using bsd sockets and in C, and it is working just fine. When I use a database client (written in JAVA, and running on a Linux box) to fire queries (with a concurrency of 100 or more) directly to the Database server, not experiencing connection resets. But through my proxy I am experiencing many connection resets. Digging deeper I came to know that connection from 'DB client' to 'Proxy' always succeeds but when the 'Proxy' tries to connect to the DB server the connection fails, due to the SYN packet getting RST,ACK. That was to give some background. The question is : Why does sometimes SYN receives RST,ACK? 'DB client(linux)' to 'Server(windows)' ---- Works fine 'DB client(linux) to 'Proxy(Linux)' to 'Server(windows)' ----- problematic I am aware that this can happen in "connection refused" case but this definitely is not that one. SYN flooding might be another scenario, but that does not explain fine behavior while firing to Server directly. I am suspecting some socket option setting may be required, that the client does before connecting and my proxy does not. Please put some light on this. Any help (links or pointers) is most appreciated. Additional info: Wrote a C client that does concurrent connections, which takes concurrency as an argument. Here are my observations: - At 5000 concurrency and above, some connects failed with 'connection refused'. - Below 2000, it works fine. But the actual problem is observed even at a concurrency of 100 or more. Note: The problem is time dependent sometimes it never comes at all and sometimes it is very frequent and DB client (directly to server) works fine at all times .

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  • Pogoplug: An Interesting, Linux-Friendly NAS

    <b>Phoronix:</b> "The Pogoplug is a network attached storage device that is far more than a basic NAS like the Icy Box NAS4220, but the Pogoplug can integrate with social networks like Twitter along with providing a rich web 2.0 interface for accessing the device from anywhere in the world."

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  • Drive still usable if Seatools reports errors?

    - by Rob
    I have a Seagate 3TB Expansion Desktop drive that was part of a Linux RAID 6 array that failed. I eventually did a zero fill both through Seagate DiscWizard and via Linux dd, neither reported errors. When I ran Seatools now, I got: Short DST - Started 5/31/2014 10:04:36 PM Short DST - Pass 5/31/2014 10:05:37 PM Long Generic - Started 5/31/2014 10:15:19 PM Bad LBA: 518242762 Not Repaired (whole bunch of bad LBAs ommited) Bad LBA: 518715255 Not Repaired Long Generic Aborted 6/1/2014 3:12:18 AM i.e. the short test passed, the long test failed. Unfortunately, the drive is out of warranty, so I can't just RMA it. But I hate tossing a drive that can still be used. So, my questions are: If the zero fill succeeded, and the short test passed, can I still use the whole drive? if not, since I'm using LVM on top of RAID, is there a way to tell either of these to just skip the bad area? If not the above, can I just create partitions before and after the part of the drive with the bad LBAs?

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  • Junk host name while using nslookup, How to change it?

    - by Jayachandran
    Hi, My question is regarding the host name mapped to a machine's IP. I am new to Linux, I have a machine to test whether our j2ee based web application runs fine in linux box. we are able to deploy our application and successfully and even able to access the same in that machine. But when I tried accessing it through another machine in the same network, I am not able to access the URL using the hostname specified, instead I am able to access if I provide the ipaddress. I tried putting nslookup MyIP# command to know the name of the ip in the DNS server, where I got some junk value.com; when I tried to access with that name I am able to access the machine. Kindly provide me inputs to change the hostname of this machine in that domain server. Thanks in Advance!! Jay

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  • 24 Extra Hot Free Linux Games (Part 2 of 3)

    <b>LinuxLinks:</b> "Now, let's scrutinize the 8 games at hand. For each game we have compiled its own portal page, providing screenshots of the game in action, a full description of the game, with an in-depth analysis of the features of the game, together with links to relevant resources and reviews."

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  • 11 of the Best Free Linux Plotting Tools

    <b>LinuxLinks:</b> "To provide an insight into the quality of software that is available, we have compiled a list of 11 excellent plotting tools. Hopefully, there will be something of interest for anyone interested in producing high quality graphs."

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  • Getting know a hardware of your Linux box

    <b>Linuxconfig:</b> "Here is a list of commands which should help you to troubleshoot your hardware and find some information about it. This is not a ultimate troubleshooting guide but certainly will serve as a good starting point."

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  • Unix like console for Windows (GIT)

    - by olo
    Currently I am using windows version git software for git, I found it is really hard to copy and paste in the console, and the mouse middle key is not supported. I used to putty SSH way to linux box then do things in putty, but at the moment I only have windows. so does anyone know some tools enable end-users have UNIX console ? Mouse middle key and highlight supported is essential. Thanks in advance for any advices. Update: Downloaded virtualbox then install a copy of Linux..then samba... seems making things complicated but handy.

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  • How to route traffic via another machine before the default gateway

    - by Rich
    At the moment I have a router on 192.168.0.1, a Linux box on 192.168.0.2 and desktop clients from 192.168.0.3. Everything works with 192.168.0.1 as the default gateway. I'd like to send the traffic from the desktop clients via the Linux box before it goes out through the router so I can sniff the traffic (some of these are wireless connections). Can I set the default gateway to 192.168.0.2 on the desktop clients and then perhaps add some iptables rules to forward this traffic through 192.168.0.1? Quite happy to change the client desktops to another subnet if that makes it easier. Thanks in advance.

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  • Get SMTP to work

    - by user664408
    We upgraded to exchange 2010 and this broke an old java based script that connected and sent out e-mail messages. Many hours later we still can't get exchange to work like exchange 2003 did. That hope was abandoned and we decided to create a linux postfix server to forward the e-mail from the old system to exchange, eliminating exchange on the java side. This still doesn't work with similar errors. I need help figuring out what is different between exchange 2003 with SSL and authentication and the new servers, both linux and exchange 2010. My guess is both have TLS and for some reason the java code won't revert back to the older version of SSL, instead it just fails. Can someone help me either setup exchange 2010 to work like 2003 used to, OR to setup postfix to mandate it use SSL 2.0 instead of TLS? unfortunately no one knows anything about the Java code and they can't decompile it apparently. Any help is appreciated.

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