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• Highly efficient filesystem APIs for certain kinds of operations

  - by romkyns

  I occasionally find myself needing certain filesystem APIs which could be implemented very efficiently if supported by the filesystem, but I've never heard of them. For example: Truncate file from the beginning, on an allocation unit boundary Split file into two on an allocation unit boundary Insert or remove a chunk from the middle of the file, again, on an allocation unit boundary The only way that I know of to do things like these is to rewrite the data into a new file. This has the benefit that the allocation unit is no longer relevant, but is extremely slow in comparison to some low-level filesystem magic. I understand that the alignment requirements mean that the methods aren't always applicable, but I think they can still be useful. For example, a file archiver may be able to trim down the archive very efficiently after the user deletes a file from the archive, even if that leaves a small amount of garbage either side for alignment reasons. Is it really the case that such APIs don't exist, or am I simply not aware of them? I am mostly interested in NTFS, but hearing about other filesystems will be interesting too.

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• jQuery plugin and prototype class

  - by Shanison

  Hi I am converting some prototype javascript to jQuery javascript. In prototype we can do Class.create to create a class. However, jQuery doesn't provide this. So I was thinking to rewrite the class into a jQuery plugin. Is this the best practice? My concern is that if I do all for the class, then I will add a lot of things to jQuery object. The other alternative is to use some extra lines of codes I found http://ejohn.org/blog/simple-javascript-inheritance/#postcomment. Then you can do the following: var Person = Class.extend({ init: function(isDancing){ this.dancing = isDancing; }, dance: function(){ return this.dancing; } }); Which one is better, please advise. Thank you very much!

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• "private" directory not accessible in Apache

  - by janeden

  The directory private lives under my DocumentRoot, and despite its name, it should be accessible just like any other dir. But if I add the following RewriteRule to httpd.conf: RewriteRule ^/([^\.]+)$ /$1.html [L] Apache returns 403 for http://server/private/2201. The error log states client denied by server configuration: /private/2201.html If I then rename private to foo, or if I request 2201.html directly, the file is served: 127.0.0.1 - - [21/Nov/2011:10:24:45 +0100] "GET /private/2201 HTTP/1.1" 403 214 127.0.0.1 - - [21/Nov/2011:10:24:58 +0100] "GET /foo/2201 HTTP/1.1" 200 3068 127.0.0.1 - - [21/Nov/2011:10:27:39 +0100] "GET /private/2201.html HTTP/1.1" 200 3068 This is confusing. Is there any special rule for directories named private? If so – why does the direct request for 2201.html work (although the denied request seems to handle the same resource, at least according to the error log entry)?

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• Quick to develop web app in Java

  - by Mike Q

  Hi all, I need to develop a basic web app very quickly (1 week) for a demo. My requirements are Java (I need to make use of existing Java libraries to access the relevant data) 2 screens One for static data view, maybe some search parameters Other for basic form entry No fancy AJAX required Ideally easy for a web designer to come in and tart it up as necessary, without having to rewrite everything My first stop was going to be to checkout Wicket as I've heard good things about it. I don't have the time right now to dive into anything heavy, which probably writes off JSF in my mind (I played with JSF1, steep learning curve which I've now slid back down). I'm happy to treat the result as throwaway so if there's a framework which starts of well but then doesn't scale up to bigger projects, that would be ok. Any suggestions appreciated on frameworks/approach.

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• Relating ping to perceived browser GUI response

  - by cvsdave

  We periodically get complaints of poor GUI (browser page) response that we need to explore. I am looking for a quick and cheap first check to see if the issue is network latency, or server performance. Has anyone encountered any discussion of ping time and perceived GUI response? I understand that GUI response is complicated, but it would be nice if we could find or develop a rule of thumb along the lines of "Hmmmm, ping is over 200, it might be network problems". Ideally, this lives in a script on the user's machine so that we can see the latency that they are seeing... (BASH, Linux). A reference to a good discussion page would be a fine answer, as would any recommendation of other source material.

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• How do I write a regex that ignores strings starting with a particular prefix, and captures everythi

  - by Mark Rogers

  Background: I'm trying to come up with a regex for a rewrite rule that will take anything that does not start with a particular prefix, and add that prefix to it. But urls that already have the prefix should be rejected by the regular expression (because they already have the url). Example: If the prefix is s1 a string like home will capture the home part. But a string like s1/home, will not capture anything. This way I can add the capture group onto the prefix, so that 'home' will become 's1/home'. I've tried (^s1/), but I'm missing something here, because that rejected 'home' for some reason.

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• FTP blocked by firewall on windows 8.1 update 1 public network

  - by amik

  I've recently upgraded to Windows 8.1 u1. I connect to VPN to one of my projects, over which I connect to FTP server (using Total Commander 8.51a). Now, when I try to connect, Total Commander hangs on "Download" (in case of passive connection on "PASV" command). I've figured out that the problem is somehow caused by firewall, because it works if I disable firewall or I set the VPN network location to "private" (which I don't want, it is not enough trusted network for me) I tried to add total commander to firewall exception for total commander, both to inbound and outbound rule, but with no success. I have no more ideas how to configure the firewall to make FTP work properly, can you plese help me? thanks in advance.

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• MySQL customized join query using multiple tables

  - by itgeek

  I am searching one student from each class from one group. There are different class groups and every group has different classes and every class has multiple students. See below: Group1 --> Class1, Class2 etc Class1 --> GreenStudent1, GreenStudent2 etc Class2 --> RedStudent1, RedStudent2 etc ------------------------------------------------------ SELECT table1.id, table1.myname, table1.marks table2.studentid, table2.studentname FROM table1 INNER JOIN table3 ON table1.oldid = table3.id INNER JOIN table2 ON table2.studentid = table3.newid WHERE table1.classgroup = 'SCI79' GROUP BY table1.oldid ORDER BY table1.marks DESC There are different joins applied in the query. Above mentioned query giving me correct results but I need little modification in it. Current query returning me one student from each class. What I need? I need one student from each class but only that student who has MAXIMUM table1.marks So I should have one student from each class who has maximum number in their relevant classes. Can anyone suggest some solution or rewrite this query? Thanks :)

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• Windows development: x86 to x64 transition

  - by Kerido

  Hi everybody. Are there any guidelines how to transit to x64 with as little pain as possible? Suppose, I have a windows native x86 executable written in C++. The EXE works fine by itself, but there is also DLL that is hosted by both, the former EXE and an outside x64 process. With setup like this, what parts would I need to rewrite? I would appreciate a more general answer or maybe a link to a reference where some theoretical background is given. Thanks

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• C# Comparison shorthand

  - by TheAdamGaskins

  I have this code: if (y == a && y == b && y == c && y == d ...) { ... } Is there some form of shorthand so that I can rewrite it as something like this? if(y == (a && b && c && d ...)) { ... } The functionality should be exactly the same. I'm just looking for something that looks less confusing. EDIT Sorry for not clarifying, all the variables are integers. I'm looking for a shorter way to ensure that a, b, c, d, ... all equal y.

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• Optimizing memory usage and changing file contents with PHP

  - by errata

  In a function like this function download($file_source, $file_target) { $rh = fopen($file_source, 'rb'); $wh = fopen($file_target, 'wb'); if (!$rh || !$wh) { return false; } while (!feof($rh)) { if (fwrite($wh, fread($rh, 1024)) === FALSE) { return false; } } fclose($rh); fclose($wh); return true; } what is the best way to rewrite last few bytes of a file with my custom string? Thanks!

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• Ruby On Rails CMS Framework

  - by stel

  Hi! I want to create a framework fo rails application. It will be a rails application but packed into gem (like a Radiant CMS). It must work like this: gem install cmsframework and then: cmsframework the_app After that we have a sceleton of rails app without any controllers etc.. - all controllers loaded from cmsframework gem. If I want to rewrite some files (for example public/styles.css) I must simply create it in my app (the_app). If I want new functions in my app I can create a plugin. But the main functionalities must be loaded from cmsframework gem. What is the best way to implement this?

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• Automatically save attachments from mail on a network drive

  - by user269646

  Every morning I receive an automatically generated e-mail from a server, it includes a spreadsheet attachment. I made a rule in outlook that captures these emails. Now, I would like to make a macro to rename the attached file (. Xls) to =today() and saves it in a folder on a network drive. This macro must run every weekday at 8:00. I've made a lot of VBA in Excel, but have no experience in outlook. Might this be possible? And does anyone know how to do it? Kind regards Staal

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• Zend Framework additional Get params with NGINX

  - by Johni

  I configured my NGINX for Zend in the following way (PHP 5.3 with fpm): server { root /home/page/public/; index index.php index.html index.htm; server_name localhost; location / { try_files $uri $uri/ /index.php; } location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include fastcgi_params; } location ~ /\.ht { deny all; } } Now i want to process additional get params like: http://web.site/index?par=1 WIth my local dev system (Apache) it works fine but not under NGINX which did'T deliver the get params. Anny suggestions? Edit: Now i use the following config which seems to work but i'm not happy with it since everybody suggests "use try_files whenever possible". location / { if (!-e $request_filename) { rewrite /(.*)$ /index.php?q=$1 last; break; } }

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• Fast comparison of char arrays?

  - by StackedCrooked

  I'm currently working in a codebase where IPv4 addresses are represented as pointers to u_int8. The equality operator is implemented like this: bool Ipv4Address::operator==(const u_int8 * inAddress) const { return (*(u_int32*) this->myBytes == *(u_int32*) inAddress); } This is probably the fasted solution, but it causes the GCC compiler warning: ipv4address.cpp:65: warning: dereferencing type-punned pointer will break strict-aliasing rules How can I rewrite the comparison correctly without breaking strict-aliasing rules and without losing performance points? I have considered using either memcmp or this macro: #define IS_EQUAL(a, b) \ (a[0] == b[0] && a[1] == b[1] && a[2] == b[2] && a[3] == b[3]) I'm thinking that the macro is the fastest solution. What do you recommend?

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• Rewriting ASP.NET (.aspx) pages in Apache

  - by whitstone86

  I managed to get ASP.NET to work in Apache, as per http://weblogs.asp.net/israelio/archive/2005/09/11/424852.aspx but I'm unsure how to get it to rewrite pages, with a web.config file. I've tried using Google endlessly, but came to nothing. What's the best solution for me to rename my pages, e.g. mytestpage.aspx to mytestpage.htm Also, anyone know how to get IIS and MySQL working? I've tried but I'm struggling to get it to work. I did this simply because I needed multiple sites on port 80 on localhost, and the website I'm developing is not suited to PHP. IIS is installed, but not being used at the moment. Thanks

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• Rejecting new HTTP requests when server reaches a certain throughput

  - by user56221

  I have a requirement to run an HTTP server that rejects new HTTP requests (with a 503, or similar) when the global transfer rate of current HTTP responses exceeds a certain level. For example, if the web server is transferring at 98Mbps, and a new HTTP request arrives, we would want to reject this (as we couldn't guarantee a good speed). I've had a look at mod_cband for Apache, limit_req for nginx, and lighttpd's rate limiting features, but none of them seem to handle my (rather contrived, granted) use case. I should add that I'm open to using pretty much any web server, and am open to implementing this in iptables rules if someone can craft such a rule! (Refusing the TCP connection is fine, it doesn't have to respond with an HTTP 503). Any suggestions?

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• Content cacheing with PHP and CodeIgniter

  - by Josh K

  I have a couple of things I'm working on, namely a page that issues five or six cURL requests and processing content on them. I'm working with CodeIgniter on a LAMP stack but am open to other options. Naturally I would prefer to not rewrite the application. I would like to know if there are any ready-made / easily learned caching methods. Primarily I'd like to check if the page has changed since I last scrapped it. If it has, redownload and present. If it hasn't, serve up a cached copy.

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• Caller property of JS for "foo = function()" style of coding

  - by arvind

  I want to use the property of "caller" for a function which is defined here It works fine for this style of function declaration function g() { alert(g.caller.name) // f } function f() { alert(f.caller.name) // undefined g() } f() JSfiddle for this But then my function declaration is something like g = function() { alert(g.caller.name) // expected f, getting undefined } f = function() { alert("calling f") alert(f.caller.name) // undefined g() } f() and I am getting undefined (basically not getting anything) JSfiddle for this Is there any way that I can use the caller property without having to rewrite my code? Also, I hope I have not made any mistakes in usage and function declaration since I am quite new to using JS.

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• How to inspect/modify Windows Firewall rules while the Windows Firewall/ICS service is stopped and disabled?

  - by Kal

  I'm trying to fix up my friend's remote Windows Server 2003 R2 machine. I have Remote Desktop access at the moment. However, I notice that Windows Firewall/Internet Connection Sharing service of the remote machine is disabled, which seems to be a bad idea. If I enable and start the service now, I may lose my Remote Desktop access in case the exception rule for Remode Desktop has not been defined in Windows Firewall. So I need a way to inspect and modify exception rules even as the Windows Firewall/ICS service is stopped and disabled. Does anybody know how?

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• Printing python tkinter output

  - by Eric

  I am trying to print the contents of a python tkinter canvas. I have tried using the postscript method of canvas to create a postscript file, but I get a blank page. I know this is because I have embedded widgets, and these do not get rendered by the postscript method. Before I rewrite my program to create a more printer-friendly layout, can someone suggest a way to approach this problem? All of the programming books I have ever read approach the problem of sending output to a printer with a bit of hand-waving, something along the lines of: "It's a difficult problem that depends on interacting with the operating system." I also have a hard time finding resources about this because of all the pages related to printing to the screen. I am using Python 2.6, on Ubuntu 9.04.

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• No exit option if something is running

  - by max

  How can I catch something going on if the user chooses the exit option from a menu? I mean I'd like to be able to manage the event of a user who is going to close the application but some activity is being performed so he/she shouldn't be able to exit. Here's the code I wrote. In a nutshell : recording is being performed -- user clicks exit -- WARNING "Process is running you can't do it"(The process goes on) nothing is running -- user clicks exit -- application closes Is it possible to solve the problem by just adding a few lines of code without having to rewrite the entire program? thanks very much in advance. MAX exitAction = new AbstractAction("Exit") { public void actionPerformed(ActionEvent e) { System.exit(0); } }; exitAction.putValue(Action.NAME, "Exit"); // description exitAction.putValue(Action.SHORT_DESCRIPTION, "Exit application");

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• Centos 6.2, Apache 2 and Listen port for socket connection

  - by salvosav

  I'm trying to make a socket connection between a client and my server through a php script. To do this, I opened a port on iptables, and configure a virtual host with apache to redirect all traffic from my door to the folder that contains the file index.php, which is my script. Doing some tests the door is open, but using command netstat -ltn , I see ':::35100'. Looking on the net I understand if in this way is only listen inward and not outward. But I don't understand how can I turn this ':::35100 '-' in this '0.0.0.0:35100 '. Or, better yet, how to add this rule. Any ideas? thanks

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• UFW blocking webrick on port 3000

  - by t Book

  On a ubuntu 10.0.4 server runs redmine. starting webrick with: ./server webrick -e production -b lvps46-173-79-113.dedicated.hosteurope.de -d makes redmine available in browser. as soon as we enable ufw, webrick can´t be accessed anymore. of course we allowed Port 3000 from anywhere ufw allow 3000/tcp ufw allow 3000/udp also a grep for iptables doesn´t show a deny rule iptables -nL | grep 3000 find the whole iptables output here http://pastebin.com/k6WNqdPU checking lsof -ni tcp:2222 tells me ruby is listening on port 3000 ruby 3457 root 5u IPv4 864846667 0t0 TCP 46.173.79.113:3000 (LISTEN) What else can we check? what´s wrong with the ufw rules for port 3000?

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• iptables to allow input and output traffic to and from web server only

  - by Caedmon

  I have an Elastic Search server which seems to have been exploited (it's being used for a DDoS attack having had NO firewall for about a month). As a temporary measure while I create a new one I was hoping to block all traffic to and from the server which wasn't coming from or going to our web server. Will these iptables rules achieve this: iptables -I INPUT \! --src 1.2.3.4 -m tcp -p tcp --dport 9200 -j DROP iptables -P FORWARD \! --src 1.2.3.4 DROP iptables -P OUTPUT \! --src 1.2.3.4 DROP The first rule is tried and tested but obviously wasn't preventing traffic coming from my server to other IP addresses so I was hoping I could add the second two rules to full secure it.

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