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• program for drawing diagrams

  - by ldigas

  I need to draw a few diagrams that describe the working of some smaller programs (nothing real, but some exercise to illustrate some points). They're supposed to be 'old kind' diagrams, like you remember from the "old school of programming" - I gather some users here will know what I mean. And it's be good if they have ready blocks for program units, IF conditions, FOR/DO loops and such ... So, anyone knows of an application for such ? (I've tried Visio which I have on my work machine (for whatever reason ... I sure didn't put it there) ... but it is "too visual" for this kinda thing ... I just want to draw a few simple black on white diagrams ... nothing special or in colours).

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• postfix specify limited relay domain while allowing sasl-auth relay

  - by tylerl

  I'm trying to set up postfix to allow relaying under a limited set of conditions: The destination domain is one of a pre-defined list -or- The client successfully logs in Here's the relevant bits o' config: smtpd_sasl_auth_enable=yes relay_domains=example.com smtpd_recipient_restrictions=permit_auth_destination,reject_unauth_destination smtpd_client_restrictions=permit_sasl_authenticated,reject The problem is that it requires that BOTH restrictions be satisfied, rather than either-or. Which is to say, it only allows relaying if the client is authenticated AND the recipient domain is @example.com. Instead, I need it to allow relaying if either one of the requirements is satisfied. How do I do this without resorting to running SMTP on two separate ports with different rules? Note: The context is an outbound-use-only (bound to 127.0.0.1) MTA on a shared web server which all site owners are allowed to relay mail to one of the "owned" domains (not server-local, though), and for which a limited set of "trusted" site owners are allowed to relay mail without restriction provided they have a valid SMTP login.

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• Sharing an Apache configuration between testing vs. production

  - by Kevin Reid

  I have a personal web site with a slightly nontrivial Apache configuration. I test changes on my personal machine before uploading them to the server. The path to the files on disk and the root URL of the site are of course different between the test and production conditions, and they occur many places in the configuration (especially <Directory blocks for special locations which have scripts or no directory listing or ...). What is the best way to share the common elements of the configuration, to make sure that my production environment matches my test environment as closely as possible? What I've thought of is to use SetEnv to store the paths for the current machine in environment variables, then Include a common configuration file with ${} everywhere there's something machine specific. Any hazards of this method?

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• Is an Ethernet point to point connection without a switch real time capable?

  - by funksoulbrother

  In automation and control, it is commonly stated that ethernet can't be used as a bus because it is not real time capable due to packet collisions. If important control packets collide, they often can't keep the hard real time conditions needed for control. But what if I have a single point to point connection with Ethernet, no switch in between? To be more precise, I have an FPGA board with a giga-Ethernet port that is connected directly to my control PC. I think the benefits of giga Ethernet over CAN or USB for a p2p connection are huge, especially for high sampling rates and lots of data generation on the FPGA board. Am I correct that with a point to point connection there can't be any packet collisions and therefore a real time environment is given even with ethernet? Thanks in advance! ~fsb

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• kernel software trap handling

  - by Tony

  I'm reading a book on Windows Internals and there's something I don't understand: "The kernel handles software interrupts either as part of hardware interrupt handling or synchronously when a thread invokes kernel functions related to the software interrupt." So does this mean that software interrupts or exceptions will only be handled under these conditions: a. When the kernel is executing a function from said thread related to the software exception(trap) b. when it is already handling a hardware trap Is my understanding of this correct? The next bit: "In most cases, the kernel installs front-end trap handling functions that perform general trap handling tasks before and after transferring control to other functions that field the trap." I don't quite understand what it means by 'front-end trap handling functions' and 'field the trap'? Can anyone help me?

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• How to run a shell script before restarting a service in Monit in case of a crash

  - by Supratik

  I am using Monit 5.3.2 in my Linux box. I am monitoring some services using Monit. I want to run a script before the running the restart command. I have used the below conditions for the same. if does not exist for 2 times within 3 cycles then exec "/bin/bash -c 'touch /tmp/somefile'" as uid someuser and gid someuser if does not exist for 10 cycles then restart Unfortunately only the restart action is getting executed. Can anyone please help me to identify why the first rule is not executed ? Is there are any other way to solve the problem ?

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• Chaotic behavior of a dead pixel on my iMac 24"

  - by Vincent Robert

  Since I bought my iMac last year, I have a white pixel on the left of my screen. I'm ok with that, one pixel is not much and I know about dead pixels policies. My problem is about understanding this "dead" pixel. But this pixel has a strange behavior. At first, it seems to be always white, but it is actually working ok under certain conditions: the mouse pointer a contextual menu Dock icons a QuickLooks video played in fullscreen other spaces than "1" The "QuickLooks fullscreen video" and "other spaces" are the one that disturb me the most. In these modes, my pixel is working fine, so it must be a software problem since my pixel is working correctly in those modes. Any ideas?

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• Program complains not enough disk space even if the disk space exists

  - by user1189899

  I have an EXT3 partition mounted in ordered data mode. If a power failure occurs when a program is creating files on that partition, I see that space usage reported is normal and I don't see any partial written files. But when I try to run the same program again after the system comes back up it complains that there is not enough disk space. Even though the free space reported is far more than required. The program always succeeds in normal conditions. Also the problem seems to disappear when the partition is remounted. I was wondering what could be the right way to handle the situation other than unmounting and remounting.

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• Good default for XDG_RUNTIME_DIR?

  - by cadrian

  The XDG Base Directory Specification is a very interesting spec for user directories. It also provides good default values, except for XDG_RUNTIME_DIR. Now I am writing a software that needs to create named pipes. It is a per-user client-server framework (there is a FIFO for the server and a FIFO per client). If XDG_RUNTIME_DIR is not defined, I am currently using a per-user subdirectory in /tmp — but it does not ensure all the specified conditions (viz. the paragraph starting with "The lifetime of the directory MUST be bound to the user being logged in…") Is /tmp/myserver-$USER good enough? Edit I saw elsewhere a few suggestions: . is quite unsatisfactory (at least because it is not an absolute path). I also saw /var/run/user/$USER — not bad, but that directory does not exist (at least on my box running a Debian testing)

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• How to prevent laptop screen brightness from changing when un/plugging battery power

  - by Nomad

  When I am using my laptop, I continually adjust the screen's brightness based on the lighting conditions in the room (e.g. how much light is coming in from windows, etc.). But if I unplug the laptop or plug it back in, Windows looks at the default brightness setting in the power profile for "on battery" or "plugged in" and changes the brightness accordingly. This is a jarring experience and then I have to hunt down the ideal brightness for my current situation again, rather than getting on with my work. I would like to make it so that plugging or unplugging the battery is not a trigger that adjusts the screen brightness at all. The screen brightness should only change when I adjust it myself. Does anybody know how this might be accomplished?

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• The KMPlayer ... playing with colors

  - by ldigas

  I'm not a video editing type, so go easy on me ... practically don't know anything on the subject except that for some videos I view, "color modifying" works (buttons n, j, r for reset ...) and for some it doesn't. What influences that and how can I incluence contrast, saturation and so on on every video I play? (mostly some recordings of experiments in poor light conditions, so those controls really come in handy when viewing some details before taking out snapshots for reports) Also, KMPlayer has an enormous number of options. Is there one somewhere that can take a snapshot in a predefined directory of the what-I-see-on-screen every xy number of seconds?

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• laptop overheating ran defraggler and now its not as hot

  - by Marko

  Trying to diagnose and fix an overheating Acer 5735 laptop, running speedfan and doing general workload to try and cause the overheat conditions. I notice that windows xp is badly fragmented according to defraggler, at 58% fragmentation. So I defrag whilst watching the speedfan window, which was at the start reporting high warning style symbols for all of the sensors. After the defrag, I rebooted and ran a few programs, and even defraggler again and the sensors in speedfan all reported green i.e. not high. Wondering if there is a correlation between windows fragmentation causing the hard drive to work harder and produce more heat inside the laptop? dont want to just assume that the problems are resolved, so either speedfan is not accurate enough or fragmentation can lead to additional hard drive heat? All comments or suggestions welcome.

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• Instant messanger capable of offline messaging & tolerant of network interruptions

  - by Terry

  I am looking for an instant messaging solution to facilitate communications between recovery vehicles in remote rural areas. All the vehicles have internet connections, but they are intermittent depending on location. Ideally we'd like something that has the following features: Offline messaging: messages sent to clients who are offline will be delivered when they next come online, regardless of whether the sender is still online or not. Lightweight: CPU cycles are limited on the machines in these vehicles. A bloated solution will be an issue. Client platform is primarily win32, but support for osx/linux/mobile devices would be a bonus. Non-chatty: Bandwidth is a precious commodity for us, so services which use a minimal amount are ideal. Fault tolerant: We see plenty of packetloss and high latency, so whatever we use needs to be able to function in trying network conditions. I'm not fussed if we use a hosted platform like gtalk/skype/msn/icq/whatever, and likewise I can run a server if need be. Suggestions would be appreciated!

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• How do the routers communicate with each other ?

  - by Berkay

  Let's say that i want make a request a to a web page which is hosted in Europe (i live in USA).My packets only consist the IP address of the web page, first the domain name to ip address transformation is done, then my packets start their journey through to europe. i assume that MAC addresses never used in this situation? are they? First, my packets deal with many routers on way how these routers communicate with each other?, are router addresses added to my packet headers ? Second, is there a specific path router to router comminication or which conditions affect this route? Third to cross the Atlantic Ocean, are cables used or... ?

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• application monitoring tools

  - by Shachar

  we're an ISV about to deploy our SaaS application over the internet to our end users, and are currently looking for an application monitoring solution. In addition to monitoring the usual OS-level suspects (I/O, disk space, logs, CPU, RAM, swapping, etc.), we're also looking to monitor, alert and report on internal application events, conditions, and counters (think queue size for internal service, or latency of a service we're getting from a third party via custom APIs). We're started looking at Nagios, Zenoss, etc., but found out those do only low-level stuff, and are currently looking at MOM and ManageEngine. Still, they are far from being an custom app monitoring tool. So - do you have anything to suggest?

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• Exchange 2003 and Outlook rule: Send auto reply message not working

  - by Mestika

  Hi, I have created a distributed group which have to send a auto reply when receiving a mail. I know that it is impossible to send a auto reply within a distributed group, but following a guide I have created a mail account called “noreply”. In outlook I have created a rule in the “noreply” account where I chose following conditions: Send to a person or distributed list (where I selected my distributed group) Then to specify what to do with that message I selected Have server reply using a specific message I’ve created my message and saved it. But when I try to write an e-mail to the distributed group it doesn’t send back the reply message. Does anyone knows what I’m doing wrong? Sincerely Mestika

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• Exchange 2007 Email Address Policies

  - by Ryan Migita

  We have recently upgraded to Exchange 2007 (from 2003) and have noticed the change from recipient policies to email address policies. We have two separate domains (let's call them domaina.com and domainb.com) we receive email for, have email address policies and both email address policies are not applied. In our Exchange 2003 environment, domaina.com was the default email address when we created new mailboxes and due to the migration, domainb is the default (and its email address policy is a higher priority). Now, when we create a new mailbox (or edit existing ones), the primary email address becomes domainb.com. Now the question is, is this as simple as putting the email address policies in the correct order? Do I have to apply both policies? What effect will the above changes make to existing mailboxes? Since we do not have any conditions set on the policies, I assume prior to making these changes, I should force all domainb mailboxes to not automatically update email address based on policy? Thanks in advance!

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• Excel INDIRECT function and conditional formatting - highlighting a row

  - by Ehryk

  I'm having an issue with conditional formatting using the INDIRECT function. I'm doing something similar to Using INDIRECT and AND/IF for conditional formatting , but the only answer there isn't working for me. Basically, I want to highlight rows where B is not blank and F is blank. INDIRECT will work for ONE of the conditions, but = AND(INDIRECT("B"&ROW()) > 0, INDIRECT("F"&ROW()) = "") does not work at all. The answer in the question points to replacing the references with relative ones, so I'm thinking this should work: = AND ($B2 > 0, $F2 = "") But it does not, nor does ISBLANK($F@) or ISEMPTY($F2) (the cell contains a formula that sometimes will return "", I want the row highlighted in these cases but only when something is in column B). Am I missing something about relative references? Why doesn't INDIRECT work with AND/OR?

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• nginx configuration for URL URI paths

  - by hachiari

  I want to switch my webserver from apache to nginx however I have difficulties in converting my current htaccess to nginx configuration the conditions that I need: I want everything to be like apache, it can read file such as js, css, jpg, png ,etc I am currently using CodeIgniter PHP frameword, it uses the URI system thingy... So my htaccess configuration for CodeIgniter URI is: RewriteEngine On RewriteBase / RewriteCond %{REQUEST_URI} ^system.* RewriteRule ^(.*)$ /index.php/$1 [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ index.php/$1 [L] RewriteCond %{HTTP_HOST} ^www.domain.tld [NC] RewriteRule ^(.*)$ hxtp://domain.tld/$1 [L,R=301] I am also using minify to compress my css and js files, so the way I call my css and js is like: hxtp://domain.tld/?=css hxtp://domain.tld/?=js I tried some configurations from the net, but I could only solve problem no 2 Thank You

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• Troubleshooting intermittantly long 'page loading' problem

  - by justSteve

  Working off IIS 7 with an asp.net mvc app. Most page accesses are lightening quick. Sometimes the browser reports 'page loading' for an exceptionally long time. We are still in the development/testing mode so it's not a network/bandwidth issue. Happens in both IE and FF. No explicit error conditions in the server logs. If i could reproduce it i could run firebug/fiddler to give more info. As it is, it's a little too infrequent to simply leave both those running hoping for the condition to fire - unless/until that's the only option to get better info. I have a hunch this is client-side jquery/ajax related but only a hunch - don't have enough background in either jQuery or MVC to really know what can go wrong. Any initial troubleshooting suggestions welcome. thx

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• Printing the second page from a Calc sheet

  - by Luke

  I've created a simple invoice document in LibreOffice Calc and it consists of 2 pages. I have defined the print range for my document as: $A$1:$D$33,$D$34:$D$35 My first page holds the actual invoice information the second page is a single merged cell holding terms and conditions text (wrapped to the cell width). The second page is defined by a row break. When I export the sheet as a PDF the first page comes out great but the second page with the terms text is all wrong. On the left hand side I see a portion of text (looks like a single column) and when I select the text inside the PDF I can see it go of the page somewhere to the left. I get the same result in a print preview. I'm at a complete loss on how to approach this problem and any insight is much appreciated.

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• Exchange 2003 and Outlook rule: Send auto reply message not working

  - by Mestika

  I have created a distributed group which have to send a auto reply when receiving a mail. I know that it is impossible to send a auto reply within a distributed group, but following a guide I have created a mail account called “noreply”. In outlook I have created a rule in the “noreply” account where I chose following conditions: Send to a person or distributed list (where I selected my distributed group) Then to specify what to do with that message I selected Have server reply using a specific message I’ve created my message and saved it. But when I try to write an e-mail to the distributed group it doesn’t send back the reply message. Does anyone knows what I’m doing wrong? Sincerely Mestika

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• Is an Ethernet point to point connection without a switch real time capable?

  - by funksoulbrother

  In automation and control, it is commonly stated that ethernet can't be used as a bus because it is not real time capable due to packet collisions. If important control packets collide, they often can't keep the hard real time conditions needed for control. But what if I have a single point to point connection with Ethernet, no switch in between? To be more precise, I have an FPGA board with a giga-Ethernet port that is connected directly to my control PC. I think the benefits of giga Ethernet over CAN or USB for a p2p connection are huge, especially for high sampling rates and lots of data generation on the FPGA board. Am I correct that with a point to point connection there can't be any packet collisions and therefore a real time environment is given even with ethernet? Thanks in advance! ~fsb

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• IPv4 private address assignment

  - by helloworld922

  I'm working on a private network which uses static IPv4 addresses as well as DHCP addressing for the physical LAN network. At a previous company I worked at they would assign static addresses in the 10.*.*.* space and all DHCP/LAN addresses were assigned in the 192.168.*.* space. Both of these address spaces are defined in the IPv4 private address space and there were never any internal conflicts. From personal experience at home, school, at work, and pretty much any other machine I've dealt with extensively (Windows and a few Linux distros), the DHCP server would always by default choose an address from the 192.168.*.* address space. Now my question is can I rely on this behavior? Do DHCP servers always by default assign from the 192.168.*.* pool (or any pool other than the 10.*.*.* pool), leaving the 10.*.*.* pool free for private static addressing? If not, under what conditions might a DHCP server choose an address in the 10.*.*.* address space?

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• set up re-direct for lan clients to local t&c page

  - by tb2571989

  Hi, I'm trying to set up something on my network so that when users connect and try and use the internet they are re-directed to a locally-hosted terms and conditions and policy page. Once they click "accept" then they will be passed through to their homepage, otherwise if they decline then the window will close or show them an error message. I've spent a while looking into this and am wondering if it's possible to do witout having to setup/add to a firewall. Otheriwse let me know what my options are and I can pass it on. Many Thanks Tom

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