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• F# and the useful infinite Sequence (I think)

  - by MarkPearl

  So I have seen a few posts done by other F# fans on solving project Euler problems. They looked really interesting and I thought with my limited knowledge of F# I would attempt a few and the first one I had a look at was problem 5. Which said : “2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder. What is the smallest number that is evenly divisible by all of the numbers from 1 to 20?” So I jumped into coding it and straight away got stuck – the C# programmer in me wants to do a loop, starting at one and dividing every number by 1 to 20 to see if they all divide and once a match is found, there is your solution. Obviously not the most elegant way but a good old brute force approach. However I am pretty sure this would not be the F# way…. So after a bit of research I found the Sequences and how useful they were. Sequences seemed like the beginning of an approach to solve my problem. In my head I thought - create a sequence, and then start at the beginning of it and move through it till you find a value that is divisible by 1 to 20. Sounds reasonable? So the question is begged - how would you create a sequence that you are sure will be large enough to hold the solution to the problem? Well… You can’t know! Some more googling and I found what I would call infinite sequences – something that looks like this… let nums = 1 |> Seq.unfold (fun i -> Some (i, i + 1))   My interpretation of this would be as follows… create a sequence, and whenever it is called add 1 to its size (I would appreciate someone helping me on wording this right functionally). Something that I don’t understand fully yet is the forward pipe operator (|>) which I think plays a key role in this code. With this in hand I was able to code a basic optimized solution to this problem. I’m going to go over it some more before I post the full code just in case!

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• Is the Observer pattern adequate for this kind of scenario?

  - by Omega

  I'm creating a simple game development framework with Ruby. There is a node system. A node is a game entity, and it has position. It can have children nodes (and one parent node). Children are always drawn relatively to their parent. Nodes have a @position field. Anyone can modify it. When such position is modified, the node must update its children accordingly to properly draw them relatively to it. @position contains a Point instance (a class with x and y properties, plus some other useful methods). I need to know when a node's @position's state changes, so I can tell the node to update its children. This is easy if the programmer does something like this: @node.position = Point.new(300,300) Because it is equivalent to calling this: # Code in the Node class def position=(newValue) @position = newValue update_my_children # <--- I know that the position changed end But, I'm lost when this happens: @node.position.x = 300 The only one that knows that the position changed is the Point instance stored in the @position property of the node. But I need the node to be notified! It was at this point that I considered the Observer pattern. Basically, Point is now observable. When a node's position property is given a new Point instance (through the assignment operator), it will stop observing the previous Point it had (if any), and start observing the new one. When a Point instance gets a state change, all observers (the node owning it) will be notified, so now my node can update its children when the position changes. A problem is when this happens: @someNode.position = @anotherNode.position This means that two nodes are observing the same point. If I change one of the node's position, the other would change as well. To fix this, when a position is assigned, I plan to create a new Point instance, copy the passed argument's x and y, and store my newly created point instead of storing the passed one. Another problem I fear is this: somePoint = @node.position somePoint.x = 500 This would, technically, modify @node's position. I'm not sure if anyone would be expecting that behavior. I'm under the impression that people see Point as some kind of primitive rather than an actual object. Is this approach even reasonable? Reasons I'm feeling skeptical: I've heard that the Observer pattern should be used with, well, many observers. Technically, in this scenario there is only one observer at a time. When assigning a node's position as another's (@someNode.position = @anotherNode.position), where I create a whole new instance rather than storing the passed point, it feels hackish, or even inefficient.

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• C program runs in Cygwin but not Linux (Malloc)

  - by Shawn

  I have a heap allocation error that I cant spot in my code that is picked up on vanguard/gdb on Linux but runs perfectly on a Windows cygwin environment. I understand that Linux could be tighter with its heap allocation than Windows but I would really like to have a response that discovers the issue/possible fix. I'm also aware that I shouldn't typecast malloc in C but it's a force of habit and doesn't change my problem from happening. My program actually compiles without error on both Linux & Windows but when I run it in Linux I get a scary looking result: malloc.c:3074: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *) &((av)-bins[((1) - 1) * 2])) - __builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) = (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)-size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed. Aborted Attached snippet from my code that is being pointed to as the error for review: /* Main */ int main(int argc, char * argv[]) { FILE *pFile; unsigned char *buffer; long int lSize; pFile = fopen ( argv[1] , "r" ); if (pFile==NULL) {fputs ("File error on arg[1]",stderr); return 1;} fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); buffer = (char*) malloc(sizeof(char) * lSize+1); if (buffer == NULL) {fputs ("Memory error",stderr); return 2;} bitpair * ppairs = (bitpair *) malloc(sizeof(bitpair) * (lSize+1)); //line 51 below calcpair(ppairs, (lSize+1)); /* irrelevant stuff */ fclose(pFile); free(buffer); free(ppairs); } typedef struct { long unsigned int a; //not actual variable names... Yes I need them to be long unsigned long unsigned int b; long unsigned int c; long unsigned int d; long unsigned int e; } bitpair; void calcpair(bitpair * ppairs, long int bits); void calcPairs(bitpair * ppairs, long int bits) { long int i, top, bot, var_1, var_2; int count = 0; for(i = 0; i < cs; i++) { top = 0; ppairs[top].e = 1; do { bot = count; count++; } while(ppairs[bot].e != 0); ppairs[bot].e = 1; var_1 = bot; var_2 = top; calcpair * bp = &ppairs[var_2]; bp->a = var_2; bp->b = var_1; bp->c = i; bp = &ppairs[var_1]; bp->a = var_2; bp->b = var_1; bp->c = i; } return; } gdb reports: free(): invalid pointer: 0x0000000000603290 * valgrind reports the following message 5 times before exiting due to "VALGRIND INTERNAL ERROR" signal 11 (SIGSEGV): Invalid read of size 8 ==2727== at 0x401043: calcPairs (in /home/user/Documents/5-3/ubuntu test/main) ==2727== by 0x400C9A: main (main.c:51) ==2727== Address 0x5a607a0 is not stack'd, malloc'd or (recently) free'd

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• Reading serialised object from file

  - by nico

  Hi everyone. I'm writing a little Java program (it's an ImageJ plugin, but the problem is not specifically ImageJ related) and I have some problem, most probably due to the fact that I never really programmed in Java before... So, I have a Vector of Vectors and I'm trying to save it to a file and read it. The variable is defined as: Vector <Vector <myROI> > ROIs = new Vector <Vector <myROI> >(); where myROI is a class that I previously defined. Now, to write the vector to a file I use: void saveROIs() { SaveDialog save = new SaveDialog("Save ROIs...", imp.getTitle(), ".xroi"); String name = save.getFileName(); if (name == null) return; String dir = save.getDirectory(); try { FileOutputStream fos = new FileOutputStream(dir+name); ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeObject(ROIs); oos.close(); } catch (Exception e) { IJ.log(e.toString()); } } This correctly generates a binary file containing (I suppose) the object ROIs. Now, I use a very similar code to read the file: void loadROIs() { OpenDialog open = new OpenDialog("Load ROIs...", imp.getTitle(), ".xroi"); String name = open.getFileName(); if (name == null) return; String dir = open.getDirectory(); try { FileInputStream fin = new FileInputStream(dir+name); ObjectInputStream ois = new ObjectInputStream(fin); ROIs = (Vector <Vector <myROI> >) ois.readObject(); // This gives error ois.close(); } catch (Exception e) { IJ.log(e.toString()); } } But this function does not work. First, I get a warning: warning: [unchecked] unchecked cast found : java.lang.Object required: java.util.Vector<java.util.Vector<myROI>> ROIs = (Vector <Vector <myROI> >) ois.readObject(); ^ I Googled for that and see that I can suppress by prepending @SuppressWarnings("unchecked"), but this just makes things worst, as I get an error: <identifier> expected ROIs = (Vector <Vector <myROI> >) ois.readObject(); ^ In any case, if I omit @SuppressWarnings and ignore the warning, the object is not read and an exception is thrown java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: myROI Again Google tells me myROI needs to implements Serializable. I tried just adding implements Serializable to the class definition, but it is not sufficient. Can anyone give me some hints on how to procede in this case? Also, how to get rid of the typecast warning?

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• Unable to cast transparent proxy to type &lt;type&gt;

  - by Rick Strahl

  This is not the first time I've run into this wonderful error while creating new AppDomains in .NET and then trying to load types and access them across App Domains. In almost all cases the problem I've run into with this error the problem comes from the two AppDomains involved loading different copies of the same type. Unless the types match exactly and come exactly from the same assembly the typecast will fail. The most common scenario is that the types are loaded from different assemblies - as unlikely as that sounds. An Example of Failure To give some context, I'm working on some old code in Html Help Builder that creates a new AppDomain in order to parse assembly information for documentation purposes. I create a new AppDomain in order to load up an assembly process it and then immediately unload it along with the AppDomain. The AppDomain allows for unloading that otherwise wouldn't be possible as well as isolating my code from the assembly that's being loaded. The process to accomplish this is fairly established and I use it for lots of applications that use add-in like functionality - basically anywhere where code needs to be isolated and have the ability to be unloaded. My pattern for this is: Create a new AppDomain Load a Factory Class into the AppDomain Use the Factory Class to load additional types from the remote domain Here's the relevant code from my TypeParserFactory that creates a domain and then loads a specific type - TypeParser - that is accessed cross-AppDomain in the parent domain:public class TypeParserFactory : System.MarshalByRefObject,IDisposable { …/// <summary> /// TypeParser Factory method that loads the TypeParser /// object into a new AppDomain so it can be unloaded. /// Creates AppDomain and creates type. /// </summary> /// <returns></returns> public TypeParser CreateTypeParser() { if (!CreateAppDomain(null)) return null; /// Create the instance inside of the new AppDomain /// Note: remote domain uses local EXE's AppBasePath!!! TypeParser parser = null; try { Assembly assembly = Assembly.GetExecutingAssembly(); string assemblyPath = Assembly.GetExecutingAssembly().Location; parser = (TypeParser) this.LocalAppDomain.CreateInstanceFrom(assemblyPath, typeof(TypeParser).FullName).Unwrap(); } catch (Exception ex) { this.ErrorMessage = ex.GetBaseException().Message; return null; } return parser; } private bool CreateAppDomain(string lcAppDomain) { if (lcAppDomain == null) lcAppDomain = "wwReflection" + Guid.NewGuid().ToString().GetHashCode().ToString("x"); AppDomainSetup setup = new AppDomainSetup(); // *** Point at current directory setup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory; //setup.PrivateBinPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "bin"); this.LocalAppDomain = AppDomain.CreateDomain(lcAppDomain,null,setup); // Need a custom resolver so we can load assembly from non current path AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler(CurrentDomain_AssemblyResolve); return true; } …} Note that the classes must be either [Serializable] (by value) or inherit from MarshalByRefObject in order to be accessible remotely. Here I need to call methods on the remote object so all classes are MarshalByRefObject. The specific problem code is the loading up a new type which points at an assembly that visible both in the current domain and the remote domain and then instantiates a type from it. This is the code in question:Assembly assembly = Assembly.GetExecutingAssembly(); string assemblyPath = Assembly.GetExecutingAssembly().Location; parser = (TypeParser) this.LocalAppDomain.CreateInstanceFrom(assemblyPath, typeof(TypeParser).FullName).Unwrap(); The last line of code is what blows up with the Unable to cast transparent proxy to type <type> error. Without the cast the code actually returns a TransparentProxy instance, but the cast is what blows up. In other words I AM in fact getting a TypeParser instance back but it can't be cast to the TypeParser type that is loaded in the current AppDomain. Finding the Problem To see what's going on I tried using the .NET 4.0 dynamic type on the result and lo and behold it worked with dynamic - the value returned is actually a TypeParser instance: Assembly assembly = Assembly.GetExecutingAssembly(); string assemblyPath = Assembly.GetExecutingAssembly().Location; object objparser = this.LocalAppDomain.CreateInstanceFrom(assemblyPath, typeof(TypeParser).FullName).Unwrap(); // dynamic works dynamic dynParser = objparser; string info = dynParser.GetVersionInfo(); // method call works // casting fails parser = (TypeParser)objparser; So clearly a TypeParser type is coming back, but nevertheless it's not the right one. Hmmm… mysterious.Another couple of tries reveal the problem however:// works dynamic dynParser = objparser; string info = dynParser.GetVersionInfo(); // method call works // c:\wwapps\wwhelp\wwReflection20.dll (Current Execution Folder) string info3 = typeof(TypeParser).Assembly.CodeBase; // c:\program files\vfp9\wwReflection20.dll (my COM client EXE's folder) string info4 = dynParser.GetType().Assembly.CodeBase; // fails parser = (TypeParser)objparser; As you can see the second value is coming from a totally different assembly. Note that this is even though I EXPLICITLY SPECIFIED an assembly path to load the assembly from! Instead .NET decided to load the assembly from the original ApplicationBase folder. Ouch! How I actually tracked this down was a little more tedious: I added a method like this to both the factory and the instance types and then compared notes:public string GetVersionInfo() { return ".NET Version: " + Environment.Version.ToString() + "\r\n" + "wwReflection Assembly: " + typeof(TypeParserFactory).Assembly.CodeBase.Replace("file:///", "").Replace("/", "\\") + "\r\n" + "Assembly Cur Dir: " + Directory.GetCurrentDirectory() + "\r\n" + "ApplicationBase: " + AppDomain.CurrentDomain.SetupInformation.ApplicationBase + "\r\n" + "App Domain: " + AppDomain.CurrentDomain.FriendlyName + "\r\n"; } For the factory I got: .NET Version: 4.0.30319.239wwReflection Assembly: c:\wwapps\wwhelp\bin\wwreflection20.dllAssembly Cur Dir: c:\wwapps\wwhelpApplicationBase: C:\Programs\vfp9\App Domain: wwReflection534cfa1f For the instance type I got: .NET Version: 4.0.30319.239wwReflection Assembly: C:\\Programs\\vfp9\wwreflection20.dllAssembly Cur Dir: c:\\wwapps\\wwhelpApplicationBase: C:\\Programs\\vfp9\App Domain: wwDotNetBridge_56006605 which clearly shows the problem. You can see that both are loading from different appDomains but the each is loading the assembly from a different location. Probably a better solution yet (for ANY kind of assembly loading problem) is to use the .NET Fusion Log Viewer to trace assembly loads.The Fusion viewer will show a load trace for each assembly loaded and where it's looking to find it. Here's what the viewer looks like: The last trace above that I found for the second wwReflection20 load (the one that is wonky) looks like this:*** Assembly Binder Log Entry (1/13/2012 @ 3:06:49 AM) *** The operation was successful. Bind result: hr = 0x0. The operation completed successfully. Assembly manager loaded from: C:\Windows\Microsoft.NET\Framework\V4.0.30319\clr.dll Running under executable c:\programs\vfp9\vfp9.exe --- A detailed error log follows. === Pre-bind state information === LOG: User = Ras\ricks LOG: DisplayName = wwReflection20, Version=4.61.0.0, Culture=neutral, PublicKeyToken=null (Fully-specified) LOG: Appbase = file:///C:/Programs/vfp9/ LOG: Initial PrivatePath = NULL LOG: Dynamic Base = NULL LOG: Cache Base = NULL LOG: AppName = vfp9.exe Calling assembly : (Unknown). === LOG: This bind starts in default load context. LOG: Using application configuration file: C:\Programs\vfp9\vfp9.exe.Config LOG: Using host configuration file: LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\V4.0.30319\config\machine.config. LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind). LOG: Attempting download of new URL file:///C:/Programs/vfp9/wwReflection20.DLL. LOG: Assembly download was successful. Attempting setup of file: C:\Programs\vfp9\wwReflection20.dll LOG: Entering run-from-source setup phase. LOG: Assembly Name is: wwReflection20, Version=4.61.0.0, Culture=neutral, PublicKeyToken=null LOG: Binding succeeds. Returns assembly from C:\Programs\vfp9\wwReflection20.dll. LOG: Assembly is loaded in default load context. WRN: The same assembly was loaded into multiple contexts of an application domain: WRN: Context: Default | Domain ID: 2 | Assembly Name: wwReflection20, Version=4.61.0.0, Culture=neutral, PublicKeyToken=null WRN: Context: LoadFrom | Domain ID: 2 | Assembly Name: wwReflection20, Version=4.61.0.0, Culture=neutral, PublicKeyToken=null WRN: This might lead to runtime failures. WRN: It is recommended to inspect your application on whether this is intentional or not. WRN: See whitepaper http://go.microsoft.com/fwlink/?LinkId=109270 for more information and common solutions to this issue. Notice that the fusion log clearly shows that the .NET loader makes no attempt to even load the assembly from the path I explicitly specified. Remember your Assembly Locations As mentioned earlier all failures I've seen like this ultimately resulted from different versions of the same type being available in the two AppDomains. At first sight that seems ridiculous - how could the types be different and why would you have multiple assemblies - but there are actually a number of scenarios where it's quite possible to have multiple copies of the same assembly floating around in multiple places. If you're hosting different environments (like hosting the Razor Engine, or ASP.NET Runtime for example) it's common to create a private BIN folder and it's important to make sure that there's no overlap of assemblies. In my case of Html Help Builder the problem started because I'm using COM interop to access the .NET assembly and the above code. COM Interop has very specific requirements on where assemblies can be found and because I was mucking around with the loader code today, I ended up moving assemblies around to a new location for explicit loading. The explicit load works in the main AppDomain, but failed in the remote domain as I showed. The solution here was simple enough: Delete the extraneous assembly which was left around by accident. Not a common problem, but one that when it bites is pretty nasty to figure out because it seems so unlikely that types wouldn't match. I know I've run into this a few times and writing this down hopefully will make me remember in the future rather than poking around again for an hour trying to debug the issue as I did today. Hopefully it'll save some of you some time as well in the future.© Rick Strahl, West Wind Technologies, 2005-2012Posted in .NET  COM   Tweet !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();

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• Search for files after a relative date using Windows search

  - by Zoredache

  I am looking for a way to save a search that includes a relative date. Specifically I am looking for a way to save a search that matches files that have a modification date that is 7 days ago. I have read the Windows Search Advanced Query Syntax document and I am not seeing a way to say 7 days ago. The numbers and ranges section does mention that relative dates are possible. The problem is that the relative dates described there do not fit the criteria I need. The lastweek almost looks like what I want except if I run a query like after:lastweek on a Monday it will only show my file that have been modified since Sunday at 12:00. The lastweek/lastmonth seem to relative to the start of the week/month which is not what I need. Multi-word relative dates: week, next month, last week, past month, or coming year. The values can also be entered contracted, as follows: thisweek, nextmonth, lastweek, pastmonth, comingyear. One nice thing about saved searches is that they are stored as an XML document and the file format is documented. I am not seeing how to form a correct value for a datetime. If I was able to understand this format, I suspect I could use a text editor and created a saved search that does what I want. Fragment from the examples: <conditions> <condition type="leafCondition" valuetype="System.StructuredQueryType.DateTime" property="System.DateModified" operator="imp" value="R00UUUUUUUUZZXD-30NU" propertyType="wstr" /> </conditions> To summarize I am looking for an answer to one or both of these questions How do I make a query for '7 days ago' using the standard syntax? How is the DateTime stored in a saved search?

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• VoIP setup for one external PSTN line

  - by Jcl

  I'm completely new to VoIP and the likes, and I'm trying to find information about what could be the best setup for this. I need 4 (maybe more in the future, but maximum 5 or 6) wireless extensions, connected to 1 PSTN line, and maybe 2 in the future. I've been trying to gather information about the gear needed but everything I find seems too much over-the-top (and extremely expensive). The main problem is that the physical place we are on doesn't have possibilities of having a decent internet connection, so using a external VoIP "virtual PBX" is not an option. Thing is, even if small, phone is critical to this organization. I currently have an analog DECT/GAP PBX which does what I need, however the PBX is very bad and the call quality is horrible, and that's why I want to change it. The requirements would be: 4 wireless terminals (routing cable is not an option), all of them ringing on incoming PSTN calls. Ability to do internal calls (4 separate offices) and ability to pass calls between terminals. The 4 terminals should be able to access the external PSTN line without dialing any special codes. Very important: terminals should be able to issue commands on the PSTN line to the external operator in the form *nn*nnnnnnnn# . Don't know wether this could face to be a problem, but I've had problems with analog PBX which would take any * as a PBX command and wouldn't allow terminals to send it to the external lines. Not so important, but would be nice to have: call waiting music Could anyone recommend such a setup? I need to be able to do this on a EXTREMELY LIMITED budget (that is: I don't have a limit, but all should get as much to zero as possible). I have enough spare powerful computers and a 300mbps wireless network which works just fine, so that's not to include in the budget. Don't really know if this is the best place to ask, but it's the most StackExchange-related site I've found to this subject.

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• Google chrome not accepting any security certificates

  - by Jerry

  I've recently developed a problem with Google Chrome that's really annoying. I'm using Firefox at the moment with no problems whatsoever and it's the same with IE, so it's safe to say this problem is specific to Chrome. The problem is that it's not accepting security certificates from certain sites. I suppose the best place to start would be google itself. I can't search. The google search page will load but when I type some search term into the search box and hit 'search' I get the message: "You attempted to reach www.google.com, but the server presented an invalid certificate. You cannot proceed because the website operator has requested heightened security for this domain." No matter what the search term is, this is the result. Also when I try to log in to facebook - same message. Youtube works and many other sites that I know present security certs so I'm baffled. I've searched and there are other people who have had similar issues but I can't find a solution anywhere. The most common answer I'm picking up for this is to "check your system time" but I can safely say that it's not my system time. If anyone knows what is going on, I'd very much appreciate being informed. It's not super urgent as I can use Firefox to access those places Chrome won't, but it IS super annoying because I can usually sort out issues like this in no time.

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• mod_rewrite REQUEST_FILENAME doesn't contain absolute path

  - by Paul Dixon

  I have a problem with a file test operation in a mod_rewrite RewriteCond entry which is testing whether %{REQUEST_FILENAME} exists. It seems that rather than %{REQUEST_FILENAME} being an absolute path, I'm getting a path which is rooted at the DocumentRoot instead. Configuration I have this inside a <VirtualHost> block in my apache 2.2.9 configuration: RewriteEngine on RewriteLog /tmp/rewrite.log RewriteLogLevel 5 #push virtually everything through our dispatcher script RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^/([^/]*)/?([^/]*) /dispatch.php?_c=$1&_m=$2 [qsa,L] Diagnostics attempted That rule is a common enough idiom for routing requests for non-existent files or directories through a script. Trouble is, it's firing even if a file does exist. If I remove the rule, I can request normal files just fine. But with the rule in place, these requests get directed to dispatch.php Rewrite log trace Here's what I see in the rewrite.log init rewrite engine with requested uri /test.txt applying pattern '^/([^/]*)/?([^/]*)' to uri '/test.txt' RewriteCond: input='/test.txt' pattern='!-f' => matched RewriteCond: input='/test.txt' pattern='!-d' => matched rewrite '/test.txt' -> '/dispatch.php?_c=test.txt&_m=' split uri=/dispatch.php?_c=test.txt&_m= -> uri=/dispatch.php, args=_c=test.txt&_m= local path result: /dispatch.php prefixed with document_root to /path/to/my/public_html/dispatch.php go-ahead with /path/to/my/public_html/dispatch.php [OK] So, it looks to me like the REQUEST_FILENAME is being presented as a path from the document root, rather than the file system root, which is presumably why the file test operator fails. Any pointers for resolving this gratefully received...

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• Minimum permissions needed to create a user Home Folder in Windows Active Directory

  - by Jim

  We would like the Help Desk to have the responsibility of creating User Home folders instead of our 2nd level support. The help desk global group is already an Account Operator, so in Active Directory they are able to edit all User Attributes just fine. The problem is figuring out the minimum level of permissions needed on the File Server to create the home share, with out giving them access to everyone home share. So if they open AD Users and Computer, open the properties for a user, and enter \home\users\%username% in the profile tab and then click OK, they get the following error. The \home\users\username home folder was not created because you do not have create access on the server. The user account has been updated with the new home folder value but you must create the directory manually after obtaining the required access right. Right now I have given the Helpdesk group Full Control on the root folder only (no files or subdirectories) The directory is actually created, but the permissions on the newly created folder only show administrators full control, and no permissions for the configured user account. It sure sounds like I'd have to make the helpdesk local admins on the file servers, which is what I'd like to avoid. Especially since the file servers are a large cluster hosting much much more than the entire orgs home share structure.

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• Restore passwd for root on a server

  - by s.mihai

  Hello,       I have a DVR server with linux embeded. It has some telnet functions but i don't have the password for it (the chinese manufacturer refuses to give me the password). I did get a upgrade folder from them and found a passwd file inside.       So i assume that when i upgrade the firmware the password in that file will be used.       Now i am trying to modify the file so taht i can insert a password i already know.       The problem is that i don't know how to create the password hash from what i figured the password hash is $1$1/lfbDKX$Hmd.FqzB8IZEohPesYi961       The file is named rom.ko and i found a command telnetd /mnt/yaffs/web/boa -c /mnt/yaffs/web & /bin/cp -f /mnt/yaffs/rom.ko /etc/shadow in a script file so i assume this is the right way.       Can you help me reconstruct a password that i know already? Tell me how or make one for me :) ?... passwd file: root:$1$1/lfbDKX$Hmd.FqzB8IZEohPesYi961:0:0:99999:7:-1:-1:33637592 bin::10897:0:99999:7::: daemon::10897:0:99999:7::: adm::10897:0:99999:7::: lp::10897:0:99999:7::: sync::10897:0:99999:7::: shutdown::10897:0:99999:7::: halt::10897:0:99999:7::: mail::10897:0:99999:7::: news::10897:0:99999:7::: uucp::10897:0:99999:7::: operator::10897:0:99999:7::: games::10897:0:99999:7::: gopher::10897:0:99999:7::: ftp::10897:0:99999:7::: nobody::10897:0:99999:7::: next::11702:0:99999:7:::

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• Mac OS X duplex printing problem: one- vs. multi-paged documents

  - by Christian Lindig

  I like to print on pre-printed stationery using the Preview.app and a duplex-capable HP Color Laserjet 4700 (PostScript) printer. The print dialog handles one and two-paged documents differently: the paper needs to be placed differently into the tray if the document contains one page versus when it contains two pages. This is not obvious when printing on plain paper but becomes obvious when front and reverse side of sheets are marked. Otherwise the first page would end up on the reverse side of the first sheet. I believe the problem is caused by the printer driver setting duplex printing to false (using the PostScript setpagedevice operator) when emitting a single-page document versus keeping it set to true when emitting multi-page documents. All this despite that duplex printing is always specified in the printer dialog. When printing a single-sided document, duplex=true and duplex=false seem to make a difference with respect which side of a sheet gets printed on. It would be also helpful if others could confirm the problem actually exists. I suspect this problem is not limited to specific printers. I'm on OS X 10.6 and I checked two different HP printers.

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• RAM ok in memtest86+ == RAM ok after wake from sleep?

  - by twon33

  I have a Windows XP (32-bit) system that appears stable in normal operation, but was repeatably freezing (hard lock, no BSOD) a minute or so after waking from S3 sleep. Some Googling against the motherboard model and memory manufacturer suggested that I might need to bump up the memory voltage, so I tried it and it now seems to resume without freezing. However, I don't really trust it and I'd like to validate that it's actually stable, especially after resuming from sleep. I've run Prime95 for a few hours with no issues, and am planning an overnight run of Memtest86+, which I expect to pass because the system has been solid whenever I've run it without putting it to sleep. Does something like Memtest86+ exist that actually invokes S3 sleep during operation? Clearly it would need an operator to wake the computer to resume testing, but I don't think I've ever heard of a memory test tool that can do this. Alternately, am I wasting my time? Should a clean bill of health from Memtest86+ indicate stability regardless of whether sleep is involved, or, conversely, does my original problem indicate that Memtest86+ would have failed eventually with the stock voltage if I'd run it, sleep or not?

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• Is this "cache administrator" error my server's problem?

  - by Eoin

  Hey, I have a CentOS VPS running Apache with a phpBB installation. One specific user has received errors when posting a message or logging in to the forum. The following issue has arisen in parallel to installing nginx, which serves only the static files of my site. Not sure if this is only coincidence. Furthermore, my setup uses redirects (in some cases, double-redirects) to point the user to a different virtual folder. So, the forum is seen to be at /translation/ but the actual files are found in /phpbb/. I'm at a loss as to what may be the underlying issue. My server? The person's ISP? She has tested both at home and at work, with similar issues. While trying to process the request: GET /phpbb/index.php?sid=f62c927e7eb8f1d60a92dcc6fd918112 HTTP/1.1 Host: www.irishgaelictranslator.com User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-za Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 115 Connection: keep-alive Referer: http://www.irishgaelictranslator.com/phpbb/ucp.php?mode=login Cookie: phpbb3_cipi4_u=96645; phpbb3_cipi4_k=; phpbb3_cipi4_sid=f62c927e7eb8f1d60a92dcc6fd918112; __utma=153470688.1232378553.1294664234.1294664234.1294664234.1; __utmb=153470688.9.10.1294664234; __utmc=153470688; __utmz=153470688.1294664235.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); style_cookie=null The following error was encountered: Invalid Response The HTTP Response message received from the contacted server could not be understood or was otherwise malformed. Please contact the site operator. Your cache administrator may be able to provide you with more details about the exact nature of the problem if needed.

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• htaccess: multiple redirections depending on domain name

  - by Marcin Kmiec

  I have a server and a few domains and two webpages. Can't figure out how to do the following: A.com -> root\ www.A.com -> root\ B.com -> root\ www.B.com -> root\ C.com -> root\folder1\ www.C.com -> root\folder1\ By the way. What is the 'and' logical operator used in htaccess? I found that 'or' is [OR] but [AND] doesn't seem to work. And what is the language htaccess is written in:)? UPDATE I made a mistake in the question though. Here's what I'd really want to do. DNS is set for the domain A.com to point to the root folder of the server. Now I would like to set the following redirections: Any domain other than C.com and other than D.com redirects (301) to www.A.com. A.com points to the root folder of the server anyway and that is set in DNS. Domain www.C.com points to the folder 'folder1' on the server. Can it be set in htaccess? Now domains C.com, www.D.com and D.com redirects to www.C.com.

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• Apache Mod SVN Access Forbidden

  - by Cerin

  How do you resolve the error svn: access to '/repos/!svn/vcc/default' forbidden? I recently upgraded a Fedora 13 server to 16, and now I'm trying to debug an access error with a Subversion server running on using Apache with mod_dav_svn. Running: svn ls http://myserver/repos/myproject/trunk Lists the correct files. But when I go to commit, I get the error: svn: access to '/repos/!svn/vcc/default' forbidden My Apache virtualhost for svn is: <VirtualHost *:80> ServerName svn.mydomain.com ServerAlias svn DocumentRoot "/var/www/html" <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory "/var/www/html"> Options Indexes FollowSymLinks AllowOverride None Order allow,deny Allow from all </Directory> <Location /repos> Order allow,deny Allow from all DAV svn SVNPath /var/svn/repos SVNAutoversioning On # Authenticate with Kerberos AuthType Kerberos AuthName "Subversion Repository" KrbAuthRealms mydomain.com Krb5KeyTab /etc/httpd/conf/krb5.HTTP.keytab # Get people from LDAP AuthLDAPUrl ldap://ldap.mydomain.com/ou=people,dc=mydomain,dc=corp?uid # For any operations other than these, require an authenticated user. <LimitExcept GET PROPFIND OPTIONS REPORT> Require valid-user </LimitExcept> </Location> </VirtualHost> What's causing this error? EDIT: In my /var/log/httpd/error_log I'm seeing a lot of these: [Fri Jun 22 13:22:51 2012] [error] [client 10.157.10.144] ModSecurity: Warning. Operator LT matched 20 at TX:inbound_anomaly_score. [file "/etc/httpd/modsecurity.d/base_rules/modsecurity_crs_60_correlation.conf"] [line "31"] [msg "Inbound Anomaly Score (Total Inbound Score: 15, SQLi=, XSS=): Method is not allowed by policy"] [hostname "svn.mydomain.com"] [uri "/repos/!svn/act/0510a2b7-9bbe-4f8c-b928-406f6ac38ff2"] [unique_id "T@Sp638DCAEBBCyGfioAAABK"] I'm not entirely sure how to read this, but I'm interpreting "Method is not allowed by policy" as meaning that there's some security Apache module that might be blocking access. How do I change this?

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• Mac Mavericks, ngircd localhost works, private IP doesn't

  - by user221945

  I have configured ngircd to listen on my private ip address. It doesn't. Localhost works fine. Configuration test: ngIRCd 21-IDENT+IPv6+IRCPLUS+SSL+SYSLOG+TCPWRAP+ZLIB-x86_64/apple/darwin13.2.0 Copyright (c)2001-2013 Alexander Barton () and Contributors. Homepage: http://ngircd.barton.de/ This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Reading configuration from "/opt/local/etc/ngircd.conf" ... OK, press enter to see a dump of your server configuration ... [GLOBAL] Name = irc.bellbookandpistol.com AdminInfo1 = Jaedreth AdminInfo2 = San Diego County CA, US AdminEMail = [email protected] HelpFile = /opt/local/share/doc/ngircd/Commands.txt Info = Server Info Text Listen = 10.0.1.5,127.0.0.1 MotdFile = MotdPhrase = "Welcome to irc.bellbookandpistol.com" Password = PidFile = Ports = 6667 ServerGID = wheel ServerUID = root [LIMITS] ConnectRetry = 60 IdleTimeout = 0 MaxConnections = 0 MaxConnectionsIP = 6 MaxJoins = -1 MaxNickLength = 9 MaxListSize = 0 PingTimeout = 120 PongTimeout = 20 [OPTIONS] AllowedChannelTypes = #&+ AllowRemoteOper = no ChrootDir = CloakHost = CloakHostModeX = CloakHostSalt = kBih5mu\kVI!DC6eifT(hd4m/0'zb/=: CloakUserToNick = no ConnectIPv4 = yes ConnectIPv6 = no DefaultUserModes = DNS = yes IncludeDir = /opt/local/etc/ngircd.conf.d MorePrivacy = no NoticeAuth = no OperCanUseMode = no OperChanPAutoOp = yes OperServerMode = no RequireAuthPing = no ScrubCTCP = no SyslogFacility = local5 WebircPassword = [SSL] CertFile = CipherList = HIGH:!aNULL:@STRENGTH DHFile = KeyFile = KeyFilePassword = Ports = [OPERATOR] Name = [REDACTED] Password = [REDACTED] Mask = [CHANNEL] Name = #BBP Modes = tnk Key = MaxUsers = 0 Topic = Welcome to the Bell, Book and Pistol IRC Server! KeyFile = As you can see, it should be listening on 10.0.1.5, but it isn't. After turning on Apache manually, port 80 works on 10.0.1.5, but port 6667 doesn't. It only works on localhost. Is there some terminal command I could use or some config file I could edit to get this to work?

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• How can I store logs and meet compliance requirements for free?

  - by Martin

  I am trying to keep long-term logs of an app in such a way, that it could plausibly demonstrated to third parties/court that the application has processed certain data at a given time. The data can be represented in XML or text format. A simple gzipped log is not plausible, as I may have added or modified data afterwards, whereas an external logging service would be an overkill. Cost is an issue, we are not dealing with financial data or so, but rather some simple user generated content, where some malicious users tried to blame the operator in the past when things escalated and went to court. My question: Is there some kind of signing software for Linux that signs each element of a log in such a way, that it can be easily shown that no element can be added or modified afterwards? Plug-Ins into some free Splunk Alternatives would be fine too. Ideally the software I am looking for should be under a GPL or similar license. I could probably achive something like this by using PGP/GPG sgning functions and including the previous elements signituares within the following element, but I would prefer to use some program where you do not have to argue about the validity of your own code. Note to mods: I am not asking this question on Stackoverflow, because I am not looking for writing own code for reasons described above. I think this question rather fits into serverfault than superuser, as server-side logging software is discussed rather here than on superuser.

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• Powershell script to delete secondary SMTP addresses of Exchange 2010 Mail Contacts

  - by Zero Subnet

  I have a few thousand Exchange 2010 Mail Contacts who get erroneously assigned internal SMTP addresses by the default recipient policy. I'm trying to use the following command to delete these addresses (keeping the primary SMTP) and disabling the automatic update from recipient policy so the SMTP addresses don't get recreated again. Get-MailContact -OrganizationalUnit "domain.local/OU" -Filter {EmailAddresses -like *@domain.local -and name -notlike "ExchangeUM*"} -ResultSize unlimited -IgnoreDefaultScope | foreach {$contact = $_; $email = $contact.emailaddresses; $email | foreach {if ($_.smtpaddress -like *@domain.local) {$address = $_.smtpaddress; write-host "Removing address" $address "from Contact" $contact.name; Set-Mailcontact -Identity $contact.identity -EmailAddresses @{Remove=$address}; $contact | set-mailcontact -emailaddresspolicyenabled $false} }} I'm getting the following error though: You must provide a value expression on the right-hand side of the '-like' operator. At line:1 char:312 + Get-MailContact -OrganizationalUnit "domain.local/testou" -Filter {EmailAddresses -like "@domain.local" -and name -notlike "ExchangeUM"} -ResultSize unlimited -IgnoreDefaultScope | foreach {$contact = $; $ email = $contact.emailaddresses; $email | foreach {if ($.smtpaddress -like <<<< *@domain.local) {$address = $_.smt paddress; write-host "Removing address" $address "from Contact" $contact.name; Set-Mailcontact -Identity $contact.ident ity -EmailAddresses @{Remove=$address}; $contact }} + CategoryInfo : ParserError: (:) [], ParentContainsErrorRecordException + FullyQualifiedErrorId : ExpectedValueExpression Any help as to how to fix this?

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• Apache displays error page half way through PHP page execution

  - by Shep

  I've just installed Zend Server Community Edition on a Windows Server 2003 box, however there's a bit of a problem with the display of a lot of our PHP pages. The code has previously running under the same version of PHP (5.3) on IIS without any issues. By the looks of things, Apache (installed as part of Zend Server) is erroring out during the rendering of the page when it comes across something it doesn't like in the PHP. Going through the code, I've been able to get past some of the problems by removing the error suppression operator (@) from function calls and by changing the format of some includes. However, I can't do this for the whole site! Weirdly, the error code is reported as "200 OK". The code snippet below shows how the Apache error HTML interrupts the regular HTML of the page. <p>Ma quande lingues coalesce, li grammatica del resultant lingue es plu simplic e regulari quam ti del coalescent lingues.</<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>200 OK</title> </head><body> <h1>OK</h1> <p>The server encountered an internal error or misconfiguration and was unable to complete your request.</p> <p>Please contact the server administrator, [email protected] and inform them of the time the error occurred, and anything you might have done that may have caused the error.</p> <p>More information about this error may be available in the server error log The Apache error log doesn't offer any explanation for this, and I've exhausted my Googling skills, so any help would be greatly appreciated. Thanks.

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• Is it better to always copy and delete, rather than move?

  - by nbolton

  Generally speaking, I find myself panicking when I realise that if I cancel a file move, it could cause the target or source to be incomplete. This question applies to Windows and Unix-based platforms. I can never remember exactly how the move command works in either case. For example, if you're moving a directory; does it copy the entire directory, then delete it after, or does it copy then delete each file individually? I always realise after typing something like, mv verybigdir dest that I really should have typed cp -R verybigdir dest && rm verybigdir (where the && operator only moves to the next command if the first was successful) -- or is this pointless? What happens exactly when I press Ctrl+C half way through a move? Likewise, what exactly happens on Windows when I press the cancel button? I can't count the number of times I've moved something (the last time was when using svn) and had two directories, with split contents. I guess the answer is difficult, because not all applications move groups of files in the same way.

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• Can Haproxy deny a request by IP if its stick-table is full?

  - by bantic

  In my haproxy configs I'm setting a stick-table of size 5 that stores every incoming IP address (for 1 minute), and it is set as nopurge so new entries won't get stored in the table. What I'd like to have happen is that they would get denied, but that isn't happening. The stick-table line is: stick-table type ip size 5 expire 1m nopurge store gpc0 And the whole configs are: global maxconn 30000 ulimit-n 65536 log 127.0.0.1 local0 log 127.0.0.1 local1 debug stats socket /var/run/haproxy.stat mode 600 level operator defaults mode http timeout connect 5000ms timeout client 50000ms timeout server 50000ms backend fragile_backend tcp-request content track-sc2 src stick-table type ip size 5 expire 1m nopurge store gpc0 server fragile_backend1 A.B.C.D:80 frontend http_proxy bind *:80 mode http option forwardfor default_backend fragile_backend I have confirmed (connecting to haproxy's stats using socat readline /var/run/haproxy.stat) that the stick-table fills up with 5 IP addresses, but then every request after that from a new IP just goes straight through -- it isn't added to the stick-table, nothing is removed from the stick-table, and the request is not denied. What I'd like to do is deny the request if the stick-table is full. Is this possible? I'm using haproxy 1.5.

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• Does Google sometimes ignore "special" characters, possibly depending on your location or font type settings? [closed]

  - by RLH

  TLDR Google tends to ignore special characters in my search strings. Is there anything that I can do about it and is it, possibly, happening because Google makes certain assumptions based off of my default text-encoding settings and my location? I just posted this question over at StackOverflow. I had found a C preprocessor that I'd never seen before. As I should have done, I Googled it and tried to find out further information. I attempted various search terms which were all variations of "C Operator ##" (some times with and some times without the double-quotes.) Google didn't bring back anything of use so I posted my question on SO. As you can see from the comments, someone mentioned a search string (ironically one which I did try to search) and stated that I could have even hit the "I'm feeling lucky" button and have gotten my answer. The problem is I did search that, and the results that I received were far more basic and even after following the top results and searching the resulting pages, I could find nothing referencing the string "##". I'm not posting this question to complain but it does provide an empirical example of something I've seen before that really bugs me-- Google often ignores special characters in my search strings and the results are often useless. As a developer I often need to search for string values containing non-alphanumeric characters. Some characters (like the underscore or hyphen) can be used without trouble. However, other characters (such as the ampersand, carat, tilde and pound sign) are often ignored in my query strings. Is there a way to prevent this from happening so that I can get meaningful results from Google? NOTE I stay logged into Google and I live in the US. I wonder if Google detects some form of text-encoding setting or derives my results based off of certain, localized text-based assumptions. Regardless, I would like to for Google to search for what I give it. Is there anything that I can do to improve my results?

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• program not working as expected!

  - by wilson88

  Can anyone just help spot why my program is not returning the expected output.related to my previous question.Am passing a vector by refrence, I want to see whats in the container before I copy them to another loaction.if u remove comments on loadRage, u will see bids are generated by the trader. #include <iostream> #include <vector> #include <string> #include <algorithm> #include <cstdlib> #include <iomanip> using namespace std; const int NUMSELLER = 1; const int NUMBUYER = 1; const int NUMBIDS = 20; const int MINQUANTITY = 1; const int MAXQUANTITY = 30; const int MINPRICE =100; const int MAXPRICE = 150; int s=0; int trdId; // Bid, simple container for values struct Bid { int bidId, trdId, qty, price; char type; // for sort and find. bool operator<(const Bid &other) const { return price < other.price; } bool operator==(int bidId) const { return this->bidId == bidId; } }; // alias to the list, make type consistent typedef vector<Bid> BidList; // this class generates bids! class Trader { private: int nextBidId; public: Trader(); Bid getNextBid(); Bid getNextBid(char type); // generate a number of bids void loadRange(BidList &, int size); void loadRange(BidList &, char type, int size); void setVector(); }; Trader::Trader() : nextBidId(1) {} #define RAND_RANGE(min, max) ((rand() % (max-min+1)) + min) Bid Trader::getNextBid() { char type = RAND_RANGE('A','B'); return getNextBid(type); } Bid Trader::getNextBid(char type) { for(int i = 0; i < NUMSELLER+NUMBUYER; i++) { // int trdId = RAND_RANGE(1,9); if (s<10){trdId=0;type='A';} else {trdId=1;type='B';} s++; int qty = RAND_RANGE(MINQUANTITY, MAXQUANTITY); int price = RAND_RANGE(MINPRICE, MAXPRICE); Bid bid = {nextBidId++, trdId, qty, price, type}; return bid; } } //void Trader::loadRange(BidList &list, int size) { // for (int i=0; i<size; i++) { list.push_back(getNextBid()); } //} // //void Trader::loadRange(BidList &list, char type, int size) { // for (int i=0; i<size; i++) { list.push_back(getNextBid(type)); } //} //---------------------------AUCTIONEER------------------------------------------- class Auctioneer { vector<Auctioneer> List; Trader trader; vector<Bid> list; public: Auctioneer(){}; void accept_bids(const BidList& bid); }; typedef vector<Auctioneer*> bidlist; void Auctioneer::accept_bids(const BidList& bid){ BidList list; //copy (BidList.begin(),BidList.end(),list); } //all the happy display commands void show(const Bid &bid) { cout << "\tBid\t(" << setw(3) << bid.bidId << "\t " << setw(3) << bid.trdId << "\t " << setw(3) << bid.type <<"\t " << setw(3) << bid.qty <<"\t " << setw(3) << bid.price <<")\t\n " ; } void show(const BidList &list) { cout << "\t\tBidID | TradID | Type | Qty | Price \n\n"; for(BidList::const_iterator itr=list.begin(); itr != list.end(); ++itr) { //cout <<"\t\t"; show(*itr); cout << endl; } cout << endl; } //search now checks for failure void show(const char *msg, const BidList &list) { cout << msg << endl; show(list); } void searchTest(BidList &list, int bidId) { cout << "Searching for Bid " << bidId << endl; BidList::const_iterator itr = find(list.begin(), list.end(), bidId); if (itr==list.end()) { cout << "Bid not found."; } else { cout << "Bid has been found. Its : "; show(*itr); } cout << endl; } //comparator function for price: returns true when x belongs before y bool compareBidList(Bid one, Bid two) { if (one.type == 'A' && two.type == 'B') return (one.price < two.price); return false; } void sort(BidList &bidlist) { sort(bidlist.begin(), bidlist.end(), compareBidList); } int main(int argc, char **argv) { Trader trader; BidList bidlist; Auctioneer auctioneer; //bidlist list; auctioneer.accept_bids(bidlist); //trader.loadRange(bidlist, NUMBIDS); show("Bids before sort:", bidlist); sort(bidlist); show("Bids after sort:", bidlist); system("pause"); return 0; }

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• c++ stl priority queue insert bad_alloc exception

  - by bsg

  Hi, I am working on a query processor that reads in long lists of document id's from memory and looks for matching id's. When it finds one, it creates a DOC struct containing the docid (an int) and the document's rank (a double) and pushes it on to a priority queue. My problem is that when the word(s) searched for has a long list, when I try to push the DOC on to the queue, I get the following exception: Unhandled exception at 0x7c812afb in QueryProcessor.exe: Microsoft C++ exception: std::bad_alloc at memory location 0x0012ee88.. When the word has a short list, it works fine. I tried pushing DOC's onto the queue in several places in my code, and they all work until a certain line; after that, I get the above error. I am completely at a loss as to what is wrong because the longest list read in is less than 1 MB and I free all memory that I allocate. Why should there suddenly be a bad_alloc exception when I try to push a DOC onto a queue that has a capacity to hold it (I used a vector with enough space reserved as the underlying data structure for the priority queue)? I know that questions like this are almost impossible to answer without seeing all the code, but it's too long to post here. I'm putting as much as I can and am anxiously hoping that someone can give me an answer, because I am at my wits' end. The NextGEQ function is too long to put here, but it reads a list of compressed blocks of docids block by block. That is, if it sees that the lastdocid in the block (in a separate list) is larger than the docid passed in, it decompresses the block and searches until it finds the right one. If it sees that it was already decompressed, it just searches. Below, when I call the function the first time, it decompresses a block and finds the docid; the push onto the queue after that works. The second time, it doesn't even need to decompress; that is, no new memory is allocated, but after that time, pushing on to the queue gives a bad_alloc error. struct DOC{ long int docid; long double rank; public: DOC() { docid = 0; rank = 0.0; } DOC(int num, double ranking) { docid = num; rank = ranking; } bool operator>( const DOC & d ) const { return rank > d.rank; } bool operator<( const DOC & d ) const { return rank < d.rank; } }; struct listnode{ int* metapointer; int* blockpointer; int docposition; int frequency; int numberdocs; int* iquery; listnode* nextnode; }; void QUERYMANAGER::SubmitQuery(char *query){ vector<DOC> docvec; docvec.reserve(20); DOC doct; //create a priority queue to use as a min-heap to store the documents and rankings; //although the priority queue uses the heap as its underlying data structure, //I found it easier to use the STL priority queue implementation priority_queue<DOC, vector<DOC>,std::greater<DOC>> q(docvec.begin(), docvec.end()); q.push(doct); //do some processing here; startlist is a pointer to a listnode struct that starts the //linked list cout << "Opening lists:" << endl; //point the linked list start pointer to the node returned by the OpenList method startlist = &OpenList(value); listnode* minpointer; q.push(doct); //more processing here; else{ //start by finding the first docid in the shortest list int i = 0; q.push(doct); num = NextGEQ(0, *startlist); q.push(doct); while(num != -1) cout << "finding nextGEQ from shortest list" << endl; q.push(doct); //the is where the problem starts - every previous q.push(doct) works; the one after //NextGEQ(num +1, *startlist) gives the bad_alloc error num = NextGEQ(num + 1, *startlist); q.push(doct); //if you didn't break out of the loop; i.e., all lists contain a matching docid, //calculate the document's rank; if it's one of the top 20, create a struct //containing the docid and the rank and add it to the priority queue if(!loop) { cout << "found match" << endl; if(num < 0) { cout << "reached end of list" << endl; //reached the end of the shortest list; close the list CloseList(startlist); break; } rank = calculateRanking(table, num); try{ //if the heap is not full, create a DOC struct with the docid and //rank and add it to the heap if(q.size() < 20) { doc.docid = num; doc.rank = rank; q.push(doct); q.push(doc); } } catch (exception& e) { cout << e.what() << endl; } } } Thank you very much, bsg.

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