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• Odd tcp deadlock under windows

  - by John Robertson

  We are moving large amounts of data on a LAN and it has to happen very rapidly and reliably. Currently we use windows TCP as implemented in C++. Using large (synchronous) sends moves the data much faster than a bunch of smaller (synchronous) sends but will frequently deadlock for large gaps of time (.15 seconds) causing the overall transfer rate to plummet. This deadlock happens in very particular circumstances which makes me believe it should be preventable altogether. More importantly if we don't really know the cause we don't really know it won't happen some time with smaller sends anyway. Can anyone explain this deadlock? Deadlock description (OK, zombie-locked, it isn't dead, but for .15 or so seconds it stops, then starts again) The receiving side sends an ACK. The sending side sends a packet containing the end of a message (push flag is set) The call to socket.recv takes about .15 seconds(!) to return About the time the call returns an ACK is sent by the receiving side The the next packet from the sender is finally sent (why is it waiting? the tcp window is plenty big) The odd thing about (3) is that typically that call doesn't take much time at all and receives exactly the same amount of data. On a 2Ghz machine that's 300 million instructions worth of time. I am assuming the call doesn't (heaven forbid) wait for the received data to be acked before it returns, so the ack must be waiting for the call to return, or both must be delayed by something else. The problem NEVER happens when there is a second packet of data (part of the same message) arriving between 1 and 2. That part very clearly makes it sound like it has to do with the fact that windows TCP will not send back a no-data ACK until either a second packet arrives or a 200ms timer expires. However the delay is less than 200 ms (its more like 150 ms). The third unseemly character (and to my mind the real culprit) is (5). Send is definitely being called well before that .15 seconds is up, but the data NEVER hits the wire before that ack returns. That is the most bizarre part of this deadlock to me. Its not a tcp blockage because the TCP window is plenty big since we set SO_RCVBUF to something like 500*1460 (which is still under a meg). The data is coming in very fast (basically there is a loop spinning out data via send) so the buffer should fill almost immediately. According to msdn the buffer being full and at least one pending send should cause the data to be sent (though in another place it mentions that there various "heuristics" used in deciding when a send hits the wire). Anway, why the sender doesn't actually send more data during that .15 second pause is the most bizarre part to me. The information above was captured on the receiving side via wireshark (except of course the socket.recv return times which were logged in a text file). We tried changing the send buffer to zero and turning off Nagle on the sender (yes, I know Nagle is about not sending small packets - but we tried turning Nagle off in case that was part of the unstated "heuristics" affecting whether the message would be posted to the wire. Technically microsoft's Nagle is that a small packet isn't sent if the buffer is full and there is an outstanding ACK, so it seemed like a possibility).

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• Apple push Notification Feedback service Not working

  - by Yassmeen

  Hi, I am developing an iPhone App that uses Apple Push Notifications. On the iPhone side everything is fine, on the server side I have a problem. Notifications are sent correctly however when I try to query the feedback service to obtain a list of devices from which the App has been uninstalled, I always get zero results. I know that I should obtain one result as the App has been uninstalled from one of my test devices. After 24 hours and more I still have no results from the feedback service.. Any ideas? Does anybody know how long it takes for the feedback service to recognize that my App has been uninstalled from my test device? Note: I have another push notification applications on the device so I know that my app is not the only app. The code - C#: public static string CheckFeedbackService(string certaName, string hostName) { SYLogger.Log("Check Feedback Service Started"); ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(ValidateServerCertificate); // Create a TCP socket connection to the Apple server on port 2196 TcpClient tcpClientF = null; SslStream sslStreamF = null; string result = string.Empty; //Contect to APNS& Add the Apple cert to our collection X509Certificate2Collection certs = new X509Certificate2Collection { GetServerCert(certaName) }; //Set up byte[] buffer = new byte[38]; int recd = 0; DateTime minTimestamp = DateTime.Now.AddYears(-1); // Create a TCP socket connection to the Apple server on port 2196 try { using (tcpClientF = new TcpClient(hostName, 2196)) { SYLogger.Log("Client Connected ::" + tcpClientF.Connected); // Create a new SSL stream over the connection sslStreamF = new SslStream(tcpClientF.GetStream(), true,ValidateServerCertificate); // Authenticate using the Apple cert sslStreamF.AuthenticateAsClient(hostName, certs, SslProtocols.Default, false); SYLogger.Log("Stream Readable ::" + sslStreamF.CanRead); SYLogger.Log("Host Name ::"+hostName); SYLogger.Log("Cert Name ::" + certs[0].FriendlyName); if (sslStreamF != null) { SYLogger.Log("Connection Started"); //Get the first feedback recd = sslStreamF.Read(buffer, 0, buffer.Length); SYLogger.Log("Buffer length ::" + recd); //Continue while we have results and are not disposing while (recd > 0) { SYLogger.Log("Reading Started"); //Get our seconds since 1970 ? byte[] bSeconds = new byte[4]; byte[] bDeviceToken = new byte[32]; Array.Copy(buffer, 0, bSeconds, 0, 4); //Check endianness if (BitConverter.IsLittleEndian) Array.Reverse(bSeconds); int tSeconds = BitConverter.ToInt32(bSeconds, 0); //Add seconds since 1970 to that date, in UTC and then get it locally var Timestamp = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddSeconds(tSeconds).ToLocalTime(); //Now copy out the device token Array.Copy(buffer, 6, bDeviceToken, 0, 32); string deviceToken = BitConverter.ToString(bDeviceToken).Replace("-", "").ToLower().Trim(); //Make sure we have a good feedback tuple if (deviceToken.Length == 64 && Timestamp > minTimestamp) { SYLogger.Log("Feedback " + deviceToken); result = deviceToken; } //Clear array to reuse it Array.Clear(buffer, 0, buffer.Length); //Read the next feedback recd = sslStreamF.Read(buffer, 0, buffer.Length); } SYLogger.Log("Reading Ended"); } } } catch (Exception e) { SYLogger.Log("Authentication failed - closing the connection::" + e); return "NOAUTH"; } finally { // The client stream will be closed with the sslStream // because we specified this behavior when creating the sslStream. if (sslStreamF != null) sslStreamF.Close(); if (tcpClientF != null) tcpClientF.Close(); //Clear array on error Array.Clear(buffer, 0, buffer.Length); } SYLogger.Log("Feedback ended "); return result; }

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• C# need help debugging socks5-connection attemp

  - by Chuck

  Hi, I've written the following code to (successfully) connect to a socks5 proxy. I send a user/pw auth and get an OK reply (0x00), but as soon as I tell the proxy to connect to whichever ip:port, it gives me 0x01 (general error). Socket socket5_proxy = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint proxyEndPoint = new IPEndPoint(IPAddress.Parse("111.111.111.111"), 1080); // proxy ip, port. fake for posting purposes. socket5_proxy.Connect(proxyEndPoint); byte[] init_socks_command = new byte[4]; init_socks_command[0] = 0x05; init_socks_command[1] = 0x02; init_socks_command[2] = 0x00; init_socks_command[3] = 0x02; socket5_proxy.Send(init_socks_command); byte[] socket_response = new byte[2]; int bytes_recieved = socket5_proxy.Receive(socket_response, 2, SocketFlags.None); if (socket_response[1] == 0x02) { byte[] temp_bytes; string socks5_user = "foo"; string socks5_pass = "bar"; byte[] auth_socks_command = new byte[3 + socks5_user.Length + socks5_pass.Length]; auth_socks_command[0] = 0x05; auth_socks_command[1] = Convert.ToByte(socks5_user.Length); temp_bytes = Encoding.Default.GetBytes(socks5_user); temp_bytes.CopyTo(auth_socks_command, 2); auth_socks_command[2 + socks5_user.Length] = Convert.ToByte(socks5_pass.Length); temp_bytes = Encoding.Default.GetBytes(socks5_pass); temp_bytes.CopyTo(auth_socks_command, 3 + socks5_user.Length); socket5_proxy.Send(auth_socks_command); socket5_proxy.Receive(socket_response, 2, SocketFlags.None); if (socket_response[1] != 0x00) return; byte[] connect_socks_command = new byte[10]; connect_socks_command[0] = 0x05; connect_socks_command[1] = 0x02; // streaming connect_socks_command[2] = 0x00; connect_socks_command[3] = 0x01; // ipv4 temp_bytes = IPAddress.Parse("222.222.222.222").GetAddressBytes(); // target connection. fake ip, obviously temp_bytes.CopyTo(connect_socks_command, 4); byte[] portBytes = BitConverter.GetBytes(8888); connect_socks_command[8] = portBytes[0]; connect_socks_command[9] = portBytes[1]; socket5_proxy.Send(connect_socks_command); socket5_proxy.Receive(socket_response); if (socket_response[1] != 0x00) MessageBox.Show("Damn it"); // I always end here, 0x01 I've used this as a reference: http://en.wikipedia.org/wiki/SOCKS#SOCKS_5 Have I completely misunderstood something here? How I see it, I can connect to the socks5 fine. I can authenticate fine. But I/the proxy can't "do" anything? Yes, I know the proxy works. Yes, the target ip is available and yes the target port is open/responsive. I get 0x01 no matter what I try to connect to. Any help is VERY MUCH appreciated! Thanks, Chuck

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• WCF timedout waiting for System.Diagnostics.Process to finish

  - by Bartek

  Dear All, We have a WCF Service deployed on Windows Server 2003 that handles file transfers. When file is in Unix format, I am converting it to Dos format in the initialization stage using System.Diagnostics.Process (.WaitForExit()). Client calls the service: obj_DataSenderService = New DataSendClient() obj_DataSenderService.InnerChannel.OperationTimeout = New TimeSpan(0, System.Configuration.ConfigurationManager.AppSettings("DatasenderServiceOperationTimeout"), 0) str_DataSenderGUID = obj_DataSenderService.Initialize(xe_InitDetails.GetXMLNode) This works fine, however for large files the conversion takes more than 10 minutes and I am getting exception: A first chance exception of type 'System.ServiceModel.CommunicationException' occurred in mscorlib.dll Additional information: The socket connection was aborted. This could be caused by an error processing your message or a receive timeout being exceeded by the remote host, or an underlying network resource issue. Local socket timeout was '00:59:59.8749992'. I tried configuring both client: <system.serviceModel> <bindings> <netTcpBinding> <binding name="NetTcpBinding_IDataSend" closeTimeout="01:00:00" openTimeout="01:00:00" receiveTimeout="01:00:00" sendTimeout="01:00:00" transactionFlow="false" transferMode="Buffered" transactionProtocol="OleTransactions" hostNameComparisonMode="StrongWildcard" listenBacklog="10" maxBufferPoolSize="524288" maxBufferSize="65536" maxConnections="10" maxReceivedMessageSize="65536"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" /> <security mode="None"> <transport clientCredentialType="Windows" protectionLevel="EncryptAndSign" /> <message clientCredentialType="Windows" /> </security> </binding> </netTcpBinding> </bindings> <client> <endpoint address="net.tcp://localhost:4000/DataSenderEndPoint" binding="netTcpBinding" bindingConfiguration="NetTcpBinding_IDataSend" contract="IDataSend" name="NetTcpBinding_IDataSend"> <identity> <servicePrincipalName value="host/localhost" /> <!--<servicePrincipalName value="host/axopwrapp01.Corp.Acxiom.net" />--> </identity> </endpoint> </client> </system.serviceModel> And service: <system.serviceModel> <bindings> <netTcpBinding> <binding name="NetTcpBinding_IDataSend" closeTimeout="01:00:00" openTimeout="01:00:00" receiveTimeout="01:00:00" sendTimeout="01:00:00" transactionFlow="false" transferMode="Buffered" transactionProtocol="OleTransactions" hostNameComparisonMode="StrongWildcard" listenBacklog="10" maxBufferPoolSize="524288" maxBufferSize="65536" maxConnections="10" maxReceivedMessageSize="65536"> </binding> </netTcpBinding> </bindings> </system.serviceModel> but without luck. In the Service trace viewer I can see: Close process timed out waiting for service dispatch to complete. with stack trace: System.ServiceModel.ServiceChannelManager.CloseInput(TimeSpan timeout) System.ServiceModel.Dispatcher.InstanceContextManager.CloseInput(TimeSpan timeout) System.ServiceModel.ServiceHostBase.OnClose(TimeSpan timeout) System.ServiceModel.Channels.CommunicationObject.Close(TimeSpan timeout) System.ServiceModel.Channels.CommunicationObject.Close() DataSenderService.DataSender.OnStop() System.ServiceProcess.ServiceBase.DeferredStop() System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs) System.Runtime.Remoting.Messaging.StackBuilderSink.PrivateProcessMessage(RuntimeMethodHandle md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs) System.Runtime.Remoting.Messaging.StackBuilderSink.AsyncProcessMessage(IMessage msg, IMessageSink replySink) System.Runtime.Remoting.Proxies.AgileAsyncWorkerItem.DoAsyncCall() System.Runtime.Remoting.Proxies.AgileAsyncWorkerItem.ThreadPoolCallBack(Object o) System.Threading._ThreadPoolWaitCallback.WaitCallback_Context(Object state) System.Threading.ExecutionContext.runTryCode(Object userData) System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) System.Threading._ThreadPoolWaitCallback.PerformWaitCallbackInternal(_ThreadPoolWaitCallback tpWaitCallBack) System.Threading._ThreadPoolWaitCallback.PerformWaitCallback(Object state) Many thanks Bartek

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• RSA encryption/ Decryption in a client server application

  - by user308806

  Hi guys, probably missing something very straight forward on this, but please forgive me, I'm very naive! Have a client server application where the client identifies its self with an RSA encrypted username & password. Unfortunately I'm getting a "bad padding exception: data must start with zero" when i try to decrypt with the public key on the client side. I'm fairly sure the key is correct as I have tested encrypting with public key then decrypting with private key on the client side with no problems at all. Just seems when I transfer it over the connection it messses it up somehow?! Using PrintWriter & BufferedReader on the sockets if thats of importance. EncodeBASE64 & DecodeBASE64 encode byte[] to 64base and vice versa respectively. Any ideas guys?? Client side: Socket connectionToServer = new Socket("127.0.0.1", 7050); InputStream in = connectionToServer.getInputStream(); DataInputStream dis = new DataInputStream(in); int length = dis.readInt(); byte[] data = new byte[length]; // dis.readFully(data); dis.read(data); System.out.println("The received Data*****************************************"); System.out.println("The length of bits "+ length); System.out.println(data); System.out.println("***********************************************************"); Decryption d = new Decryption(); byte [] ttt = d.decrypt(data); System.out.print(data); String ss = new String(ttt); System.out.println("***********************"); System.out.println(ss); System.out.println("************************"); Server Side: in = connectionFromClient.getInputStream(); OutputStream out = connectionFromClient.getOutputStream(); DataOutputStream dataOut = new DataOutputStream(out); LicenseList licenses = new LicenseList(); String ValidIDs = licenses.getAllIDs(); System.out.println(ValidIDs); Encryption enc = new Encryption(); byte[] encrypted = enc.encrypt(ValidIDs); byte[] dd = enc.encrypt(ValidIDs); String tobesent = new String(dd); //byte[] rsult = enc.decrypt(dd); //String tt = String(rsult); System.out.println("The sent data**********************************************"); System.out.println(dd); String temp = new String(dd); System.out.println(temp); System.out.println("*************************************************************"); //BufferedWriter bf = new BufferedWriter(OutputStreamWriter(out)); //dataOut.write(ValidIDs.getBytes().length); dataOut.writeInt(ValidIDs.getBytes().length); dataOut.flush(); dataOut.write(encrypted); dataOut.flush(); System.out.println("********Testing**************"); System.out.println("Here are the ids:::"); System.out.println(licenses.getAllIDs()); System.out.println("**********************"); //bw.write("it is working well\n");

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• Web Services c#, Sending notifications Clients

  - by Diode

  I want to send a notification (say a string) to subscribers(subscribers ip addresses are in a database on the server side) by calling another method. when ever I call that method the output becomes error-some. [WebMethod] public string GetGroupPath(string emailAddress, string password, string ipAddress) { //SqlDataAdapter dbadapter = null; DataSet returnDS = new DataSet(); string groupName = null; string groupPath = null; SqlConnection dbconn = new SqlConnection("Server = localhost;Database=server;User ID = admin;Password = password;Trusted_Connection=false;"); dbconn.Open(); SqlCommand cmd = new SqlCommand(); string getGroupName = "select users.groupname from users where emailaddress = "+"'"+ emailAddress+"'"+ " and "+ "users.password = " + "'" +password+"'"; cmd.CommandText = getGroupName; cmd.Connection = dbconn; SqlDataReader reader = null; try { reader = cmd.ExecuteReader(); while (reader.Read()) { groupName = reader["groupname"].ToString(); } } catch (Exception) { groupPath = "Invalied"; } dbconn.Close(); dbconn.Open(); if (groupName != null) { string getPath = "select groups.grouppath from groups where groupname = " + "'" + groupName + "'"; cmd.CommandText = getPath; cmd.Connection = dbconn; try { reader = cmd.ExecuteReader(); while (reader.Read()) { groupPath = reader["grouppath"].ToString(); } } catch { groupPath = "Invalied"; } } else groupPath = "Invalied"; dbconn.Close(); if (groupPath != "Invalied") { dbconn.Open(); string getPath = "update users set users.ipaddress = "+"'"+ipAddress+"'"+" where users.emailaddress = " + "'" + emailAddress + "'"; cmd.CommandText = getPath; cmd.Connection = dbconn; cmd.ExecuteNonQuery(); dbconn.Close(); } NotifyUsers(); //NotifyUsers nu = new NotifyUsers(); //List<string> ipList = new List<string>(); //ipList.Add("192.168.56.1"); //nu.Notify(); return groupPath; } private void NotifyUsers() { Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); byte[] ipb = Encoding.ASCII.GetBytes("255.255.255.255"); IPAddress ipAddress = new IPAddress(ipb); IPEndPoint endPoint = new IPEndPoint(ipAddress, 15000); string notification = "new_update"; byte[] sendBuffer = Encoding.ASCII.GetBytes(notification); sock.SendTo(sendBuffer, endPoint); sock.Close(); } This is what has to be basically done. in the server side I have a listening thread and it gets notification when the server sends data( assume for now the database contains client ip address). then ever I call the web method it gives a error "invalid IPAddress" atline byte[] ipb = Encoding.ASCII.GetBytes("255.255.255.255"); thank you :) since this is my first ever post please be kind enough to give me a better feedback too :) thaks

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• Use of select or multithread for almost 80 or more clients?

  - by Tushar Goel

  I am working on one project in which i need to read from 80 or more clients and then write their o/p into a file continuously and then read these new data for another task. My question is what should i use select or multithreading? Also I tried to use multi threading using read/fgets and write/fputs call but as they are blocking calls and one operation can be performed at one time so it is not feasible. Any idea is much appreciated. update 1: I have tried to implement the same using condition variable. I able to achieve this but it is writing and reading one at a time.When another client tried to write then it cannot able to write unless i quit from the 1st thread. I do not understand this. This should work now. What mistake i am doing? Update 2: Thanks all .. I am able to succeeded to get this model implemented using mutex condition variable. updated Code is as below: **header file******* char *mailbox ; pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER ; pthread_cond_t writer = PTHREAD_COND_INITIALIZER; int main(int argc,char *argv[]) { pthread_t t1 , t2; pthread_attr_t attr; int fd, sock , *newfd; struct sockaddr_in cliaddr; socklen_t clilen; void *read_file(); void *update_file(); //making a server socket if((fd=make_server(atoi(argv[1])))==-1) oops("Unable to make server",1) //detaching threads pthread_attr_init(&attr); pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED); ///opening thread for reading pthread_create(&t2,&attr,read_file,NULL); while(1) { clilen = sizeof(cliaddr); //accepting request sock=accept(fd,(struct sockaddr *)&cliaddr,&clilen); //error comparison against failire of request and INT if(sock==-1 && errno != EINTR) oops("accept",2) else if ( sock ==-1 && errno == EINTR) oops("Pressed INT",3) newfd = (int *)malloc(sizeof(int)); *newfd = sock; //creating thread per request pthread_create(&t1,&attr,update_file,(void *)newfd); } free(newfd); return 0; } void *read_file(void *m) { pthread_mutex_lock(&lock); while(1) { printf("Waiting for lock.\n"); pthread_cond_wait(&writer,&lock); printf("I am reading here.\n"); printf("%s",mailbox); mailbox = NULL ; pthread_cond_signal(&writer); } } void *update_file(int *m) { int sock = *m; int fs ; int nread; char buffer[BUFSIZ] ; if((fs=open("database.txt",O_RDWR))==-1) oops("Unable to open file",4) while(1) { pthread_mutex_lock(&lock); write(1,"Waiting to get writer lock.\n",29); if(mailbox != NULL) pthread_cond_wait(&writer,&lock); lseek(fs,0,SEEK_END); printf("Reading from socket.\n"); nread=read(sock,buffer,BUFSIZ); printf("Writing in file.\n"); write(fs,buffer,nread); mailbox = buffer ; pthread_cond_signal(&writer); pthread_mutex_unlock(&lock); } close(fs); }

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• Doesn't get the output in Java Database Connectivity

  - by Dooree

  I'm working on Java Database Connectivity through Eclipse IDE. I built a database through Ubuntu Terminal, and I need to connect and work with it. However, when I tried to run the following code, I don't get any error, but the following output is showed, anybody knows why I don't get the output from the code ? //STEP 1. Import required packages import java.sql.*; public class FirstExample { // JDBC driver name and database URL static final String JDBC_DRIVER = "com.mysql.jdbc.Driver"; static final String DB_URL = "jdbc:mysql://localhost/EMP"; // Database credentials static final String USER = "username"; static final String PASS = "password"; public static void main(String[] args) { Connection conn = null; Statement stmt = null; try{ //STEP 2: Register JDBC driver Class.forName("com.mysql.jdbc.Driver"); //STEP 3: Open a connection System.out.println("Connecting to database..."); conn = DriverManager.getConnection(DB_URL,USER,PASS); //STEP 4: Execute a query System.out.println("Creating statement..."); stmt = conn.createStatement(); String sql; sql = "SELECT id, first, last, age FROM Employees"; ResultSet rs = stmt.executeQuery(sql); //STEP 5: Extract data from result set while(rs.next()){ //Retrieve by column name int id = rs.getInt("id"); int age = rs.getInt("age"); String first = rs.getString("first"); String last = rs.getString("last"); //Display values System.out.print("ID: " + id); System.out.print(", Age: " + age); System.out.print(", First: " + first); System.out.println(", Last: " + last); } //STEP 6: Clean-up environment rs.close(); stmt.close(); conn.close(); }catch(SQLException se){ //Handle errors for JDBC se.printStackTrace(); }catch(Exception e){ //Handle errors for Class.forName e.printStackTrace(); }finally{ //finally block used to close resources try{ if(stmt!=null) stmt.close(); }catch(SQLException se2){ }// nothing we can do try{ if(conn!=null) conn.close(); }catch(SQLException se){ se.printStackTrace(); }//end finally try }//end try System.out.println("Goodbye!"); }//end main }//end FirstExample <ConnectionProperties> <PropertyCategory name="Connection/Authentication"> <Property name="user" required="No" default="" sortOrder="-2147483647" since="all"> The user to connect as </Property> <Property name="password" required="No" default="" sortOrder="-2147483646" since="all"> The password to use when connecting </Property> <Property name="socketFactory" required="No" default="com.mysql.jdbc.StandardSocketFactory" sortOrder="4" since="3.0.3"> The name of the class that the driver should use for creating socket connections to the server. This class must implement the interface 'com.mysql.jdbc.SocketFactory' and have public no-args constructor. </Property> <Property name="connectTimeout" required="No" default="0" sortOrder="9" since="3.0.1"> Timeout for socket connect (in milliseconds), with 0 being no timeout. Only works on JDK-1.4 or newer. Defaults to '0'. </Property> ...

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• Super Computer Built from Raspberry Pi Boards and LEGO Bricks

  - by Jason Fitzpatrick

  It was only a matter of time before someone chained together dozens of Raspberry Pi boards into a serviceable super computer; read on to see how a team of Southampton scientists built a 64-core machine using them. Image courtesy of Simon Cox and the University of Southampton. From the University of South Hampton press release: Professor Cox comments: “As soon as we were able to source sufficient Raspberry Pi computers we wanted to see if it was possible to link them together into a supercomputer. We installed and built all of the necessary software on the Pi starting from a standard Debian Wheezy system image and we have published a guide so you can build your own supercomputer.” The racking was built using Lego with a design developed by Simon and James, who has also been testing the Raspberry Pi by programming it using free computer programming software Python and Scratch over the summer. The machine, named “Iridis-Pi” after the University’s Iridis supercomputer, runs off a single 13 Amp mains socket and uses MPI (Message Passing Interface) to communicate between nodes using Ethernet. The whole system cost under £2,500 (excluding switches) and has a total of 64 processors and 1Tb of memory (16Gb SD cards for each Raspberry Pi). Professor Cox uses the free plug-in ‘Python Tools for Visual Studio’ to develop code for the Raspberry Pi. How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using? HTG Explains: What The Windows Event Viewer Is and How You Can Use It

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• CodePlex Daily Summary for Wednesday, December 08, 2010

  CodePlex Daily Summary for Wednesday, December 08, 2010Popular ReleasesAlgorithmia: Algorithmia 1.1: Algorithmia v1.1, released on December 8th, 2010.SubtitleTools: SubtitleTools 1.1: Added a better ToUTF-8 converter (not just from windows-1256 to utf-8). Refactored OpenFileDialogs to a more MVVM friendly behavior.SuperSocket, an extensible socket application framework: SuperSocket 1.0 SP1: Fixed bugs: fixed a potential bug that the running state hadn't been updated after socket server stopped fixed a synchronization issue when clearing timeout session fixed a bug in ArraySegmentList fixed a bug on getting configuration valueHydroDesktop - CUAHSI Hydrologic Information System Desktop Application: 1.1.340: HydroDesktop 1.1 Stable Release (Build 340)CslaGenFork: CslaGenFork 4.0 CTP 2: The version is 4.0.1 CTP2 and was released 2010 December 7 and includes the following files: CslaGenFork 4.0.1-2010-12-07 Setup.msi Templates-2010-10-07.zip For getting started instructions, refer to How to section. Overview of the changes Since CTP1 there were 53 work items closed (28 features, 24 issues and 1 task). During this 60 days a lot of work has been done on several areas. First the stereotypes: EditableRoot is OK EditableChild is OK EditableRootCollection is OK Editable...My Web Pages Starter Kit: 1.3.1 Production Release (Security HOTFIX): Due to a critical security issue, it's strongly advised to update the My Web Pages Starter Kit to this version. Possible attackers could misuse the image upload to transmit any type of file to the website. If you already have a running version of My Web Pages Starter Kit 1.3.0, you can just replace the ftb.imagegallery.aspx file in the root directory with the one attached to this release.EnhSim: EnhSim 2.2.0 ALPHA: 2.2.0 ALPHAThis release adds in the changes for 4.03a. at level 85 To use this release, you must have the Microsoft Visual C++ 2010 Redistributable Package installed. This can be downloaded from http://www.microsoft.com/downloads/en/details.aspx?FamilyID=A7B7A05E-6DE6-4D3A-A423-37BF0912DB84 To use the GUI you must have the .NET 4.0 Framework installed. This can be downloaded from http://www.microsoft.com/downloads/en/details.aspx?FamilyID=9cfb2d51-5ff4-4491-b0e5-b386f32c0992 - Updated En...ASP.NET MVC Project Awesome (jQuery Ajax helpers): 1.4: A rich set of helpers (controls) that you can use to build highly responsive and interactive Ajax-enabled Web applications. These helpers include Autocomplete, AjaxDropdown, Lookup, Confirm Dialog, Popup Form, Popup and Pager new stuff: popup WhiteSpaceFilterAttribute tested on mozilla, safari, chrome, opera, ie 9b/8/7/6nopCommerce. ASP.NET open source shopping cart: nopCommerce 1.90: To see the full list of fixes and changes please visit the release notes page (http://www.nopCommerce.com/releasenotes.aspx).TweetSharp: TweetSharp v2.0.0.0 - Preview 4: Documentation for this release may be found at http://tweetsharp.codeplex.com/wikipage?title=UserGuide&referringTitle=Documentation. Note: This code is currently preview quality. Preview 4 ChangesReintroduced fluent interface support via satellite assembly Added entities support, entity segmentation, and ITweetable/ITweeter interfaces for client development Numerous fixes reported by preview users Preview 3 ChangesNumerous fixes and improvements to core engine Twitter API coverage: a...myCollections: Version 1.2: New in version 1.2: Big performance improvement. New Design (Added Outlook style View, New detail view, New Groub By...) Added Sort by Media Added Manage Movie Studio Zoom preference is now saved. Media name are now editable. Added Portuguese version You can now Hide details panel Add support for FLAC tags You can now imports books from BibTex Xml file BugFixingmytrip.mvc (CMS & e-Commerce): mytrip.mvc 1.0.49.0 beta: mytrip.mvc 1.0.49.0 beta web Web for install hosting System Requirements: NET 4.0, MSSQL 2008 or MySql (auto creation table to database) if .\SQLEXPRESS auto creation database (App_Data folder) mytrip.mvc 1.0.49.0 beta src System Requirements: Visual Studio 2010 or Web Deweloper 2010 MSSQL 2008 or MySql (auto creation table to database) if .\SQLEXPRESS auto creation database (App_Data folder) Connector/Net 6.3.4, MVC3 RC WARNING For run and debug mytrip.mvc 1.0.49.0 beta src download and ...MiniTwitter: 1.62: MiniTwitter 1.62 ???? ?? ??????????????????????????????????????? 140 ?????????????????????????? ???????????????????????????????? ?? ??????????????????????????????????Phalanger - The PHP Language Compiler for the .NET Framework: 2.0 (December 2010): The release is targetted for stable daily use. With improved performance and enhanced compatibility with several latest PHP open source applications; it makes this release perfect replacement of your old PHP runtime. Changes made within this release include following and much more: Performance improvements based on real-world applications experience. We determined biggest bottlenecks and we found and removed overheads causing performance problems in many PHP applications. Reimplemented nat...Chronos WPF: Chronos v2.0 Beta 3: Release notes: Updated introduction document. Updated Visual Studio 2010 Extension (vsix) package. Added horizontal scrolling to the main window TaskBar. Added new styles for ListView, ListViewItem, GridViewColumnHeader, ... Added a new WindowViewModel class (allowing to fetch data). Added a new Navigate method (with several overloads) to the NavigationViewModel class (protected). Reimplemented Task usage for the WorkspaceViewModel.OnDelete method. Removed the reflection effect...MDownloader: MDownloader-0.15.26.7024: Fixed updater; Fixed MegauploadDJ - jQuery WebControls for ASP.NET: DJ 1.2: What is new? Update to support jQuery 1.4.2 Update to support jQuery ui 1.8.6 Update to Visual Studio 2010 New WebControls with samples added Autocomplete WebControl Button WebControl ToggleButt WebControl The example web site is including in source code project.LateBindingApi.Excel: LateBindingApi.Excel Release 0.7g: Unterschiede zur Vorgängerversion: - Zusätzliche Interior Properties - Group / Ungroup Methoden für Range - Bugfix COM Reference Handling für Application Objekt in einigen Klassen Release+Samples V0.7g: - Enthält Laufzeit DLL und Beispielprojekte Beispielprojekte: COMAddinExample - Demonstriert ein versionslos angebundenes COMAddin Example01 - Background Colors und Borders für Cells Example02 - Font Attributes undAlignment für Cells Example03 - Numberformats Example04 - Shapes, WordArts, P...ESRI ArcGIS Silverlight Toolkit: November 2010 - v2.1: ESRI ArcGIS Silverlight Toolkit v2.1 Added Windows Phone 7 build. New controls added: InfoWindow ChildPage (Windows Phone 7 only) See what's new here full details for : http://help.arcgis.com/en/webapi/silverlight/help/#/What_s_new_in_2_1/016600000025000000/ Note: Requires Visual Studio 2010, .NET 4.0 and Silverlight 4.0.ASP .NET MVC CMS (Content Management System): Atomic CMS 2.1.1: Atomic CMS 2.1.1 release notes Atomic CMS installation guide New ProjectsCore Motives Tracking Web Part: This C# web part was created to allow users of SharePoint 2007 to place CoreMotives (http://www.coremotives.com) tracking code on any web part page. Can also be used in master pages and page layouts.CPEBook: OsefEatFrsh: Keep Track of contents of your Fridge. Eat items while they are still fresh.ENUH10Publisher: Et prosjekt for studenter ved eCademy H10EVE Community Portal: EVE Community Portal is a complete community portal for EVE alliances (and corporations), which will host everything an eve alliance needs, from a forum and blogs to every tool you could whish for and more...FER CSLA.NET Compact: .NET Compact Framework edition of CSLA.NET application framework.Finger Mouse: it's a good idea and simple program help you to use the mouse feature from webcam (without mouse) note : you should have i3 or higher processorGambaru: Gambaru é um techdemo de um game 3D desenvolvido em Delphi. Utiliza engine de física Newton e Open GL (pacote GL-Scene). Foi apresentado como trabalho de conclusão de curso no SENAC-SP por Marcelo, Daniel e Thais em 2007. Exploramos o universo Samurai. Contribua, programe, sonhe!GameBoyEmu: ????，GameBoy ???GenericList Inherits IDataReader ( ListEx<T>() : IDataReader ): This Generic List implements the IDataReader interface and displays the usage of Linq, Lamba expressions and some creative thought around working with collection types. I hope it can serve as reference to your projects.Guard: Provides the argument validation class Guard, ubiquitously used throughout all .NET projects but with no central place for updates.HolidayChecker Library: HolidayChecker Library is a usefull library that allows programmers to know if a certain date is a festivity or not. This library also allows the calculation of Easter day based on the algorithm of Tondering. It's developed in C#.JuniorTour - Junior Golf Tour Silverlight Application: JuniorTour makes it easier for golf tour operators to publish tournament results for multiple divisions and multiple seasons. You'll no longer have to manually edit player pages, tournament results, or compute rankings. It's developed in C# and Silverlight.LibGT: LibGT aims to reduce the amount of overall code a programmer has to write in C#. This library provides many shortcuts and extension methods to facilitate robust development rapidly even without the use of an IDE.Mayhem: Mayhem makes it simple for end users to control complex events with their PCs. Whether you want to Update a Twitter status when your cat is detected by your webcam or monitor your serial ports and trigger events, it's no problem with Mayhem -- wreak your own personal havoc.mmht: ???????，??????MobilePolice: my mobilepolice projectOpenCallback: This is a implementation of the callback handler pattern that allows you to invoke the callback handle methods with out type switching or if...else if chains.Project Baron: Simple, yet powerful Project Management System.PS3Lib for SDK 1.92: Création d'une librairie de ceveloppement pour le SDK 1.92Remote Controller for Trackmania: Evzrecon is a remote controller for Trackmania Forever dedicated servers, much like XASECO but written in Java.SharePointSocial: SharePointSocial is focused on taking social interaction within SharePoint to the next level, extending beyond the corporate boundaries. Corporate listening, one-click interaction through key social media outlets and data-driven management and reporting are planned features.SIGS: ssSimple Routing: Simple Routing allows you to associate arbitrary routes with static methods in an ASP.NET application through attribution.SlimCRM: Aplicación de referencia de buenas prácticas de programaciónTalkBoard: ????????，?????????！uHelpsy - Umbraco Helper Library: uHelpsy is a tiny (but growing) library which makes programatically interacting with Umbraco 4.5.2 much more pleasant. It provides helper methods for creating and updating nodes, working with the Umbraco cache, and dealing with unpublished nodes. VCSS: VCSS is a decorated version of CSS (Cascading Style Sheets) that allows you to specify variables and also nest rules. The VCSS file can be compiled into a standard CSS file to be used on any website.Vote: ?，???????????????！WP7 GPS Simulator: Use this project to simulate GPS while doing development on your Windows Phone 7.WPF_CAD: this proyect it's a college proyect form grafic computer course. Consist in the development of a cad soft implementing all grafics algoritms.Xml-Racing: Réaliser une application Web 3-tiers qui permette d'interroger une BD et de restituer les infos sous forme de graphiques et cartes.

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• SQLAuthority News – Fast Track Data Warehouse 3.0 Reference Guide

  - by pinaldave

  http://msdn.microsoft.com/en-us/library/gg605238.aspx I am very excited that Fast Track Data Warehouse 3.0 reference guide has been announced. As a consultant I have always enjoyed working with Fast Track Data Warehouse project as it truly expresses the potential of the SQL Server Engine. Here is few details of the enhancement of the Fast Track Data Warehouse 3.0 reference architecture. The SQL Server Fast Track Data Warehouse initiative provides a basic methodology and concrete examples for the deployment of balanced hardware and database configuration for a data warehousing workload. Balance is measured across the key components of a SQL Server installation; storage, server, application settings, and configuration settings for each component are evaluated. Description Note FTDW 3.0 Architecture Basic component architecture for FT 3.0 based systems. New Memory Guidelines Minimum and maximum tested memory configurations by server socket count. Additional Startup Options Notes for T-834 and setting for Lock Pages in Memory. Storage Configuration RAID1+0 now standard (RAID1 was used in FT 2.0). Evaluating Fragmentation Query provided for evaluating logical fragmentation. Loading Data Additional options for CI table loads. MCR Additional detail and explanation of FTDW MCR Rating. Read white paper on fast track data warehousing. Reference: Pinal Dave (http://blog.SQLAuthority.com)   Filed under: Business Intelligence, Data Warehousing, PostADay, SQL, SQL Authority, SQL Documentation, SQL Download, SQL Query, SQL Server, SQL Tips and Tricks, SQL White Papers, SQLAuthority News, T SQL, Technology

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• CodePlex Daily Summary for Thursday, December 09, 2010

  CodePlex Daily Summary for Thursday, December 09, 2010Popular ReleasesAutoLoL: AutoLoL v1.4.3: AutoLoL now supports importing the build pages from Mobafire.com as well! Just insert the url to the build and voila. (For example: http://www.mobafire.com/league-of-legends/build/unforgivens-guide-how-to-build-a-successful-mordekaiser-24061) Stable release of AutoChat (It is still recommended to use with caution and to read the documentation) It is now possible to associate *.lolm files with AutoLoL to quickly open them The selected spells are now displayed in the masteries tab for qu...SubtitleTools: SubtitleTools 1.2: - Added auto insertion of RLE (RIGHT-TO-LEFT EMBEDDING) Unicode character for the RTL languages. - Fixed delete rows issue.PHP Manager for IIS: PHP Manager 1.1 for IIS 7: This is a final stable release of PHP Manager 1.1 for IIS 7. This is a minor incremental release that contains all the functionality available in 53121 plus additional features listed below: Improved detection logic for existing PHP installations. Now PHP Manager detects the location to php.ini file in accordance to the PHP specifications Configuring date.timezone. PHP Manager can automatically set the date.timezone directive which is required to be set starting from PHP 5.3 Ability to ...Algorithmia: Algorithmia 1.1: Algorithmia v1.1, released on December 8th, 2010.SuperSocket, an extensible socket application framework: SuperSocket 1.0 SP1: Fixed bugs: fixed a potential bug that the running state hadn't been updated after socket server stopped fixed a synchronization issue when clearing timeout session fixed a bug in ArraySegmentList fixed a bug on getting configuration valueCslaGenFork: CslaGenFork 4.0 CTP 2: The version is 4.0.1 CTP2 and was released 2010 December 7 and includes the following files: CslaGenFork 4.0.1-2010-12-07 Setup.msi Templates-2010-10-07.zip For getting started instructions, refer to How to section. Overview of the changes Since CTP1 there were 53 work items closed (28 features, 24 issues and 1 task). During this 60 days a lot of work has been done on several areas. First the stereotypes: EditableRoot is OK EditableChild is OK EditableRootCollection is OK Editable...Windows Workflow Foundation on Codeplex: WF AppFabric Caching Activity Pack 0.1: This release includes a set of AppFabric Caching Activities that allow you to use Windows Server AppFabric Caching with WF4. Video endpoint.tv - New WF4 Caching Activities for Windows Server AppFabric ActivitiesDataCacheAdd DataCacheGet DataCachePut DataCacheGet DataCacheRemove WaitForCacheBulkNotification WaitForCacheNotification WaitForFailureNotification WaitForItemNotification WaitForRegionNotification Unit TestsUnit tests are included in the source. Be sure to star...My Web Pages Starter Kit: 1.3.1 Production Release (Security HOTFIX): Due to a critical security issue, it's strongly advised to update the My Web Pages Starter Kit to this version. Possible attackers could misuse the image upload to transmit any type of file to the website. If you already have a running version of My Web Pages Starter Kit 1.3.0, you can just replace the ftb.imagegallery.aspx file in the root directory with the one attached to this release.EnhSim: EnhSim 2.2.0 ALPHA: 2.2.0 ALPHAThis release adds in the changes for 4.03a. at level 85 To use this release, you must have the Microsoft Visual C++ 2010 Redistributable Package installed. This can be downloaded from http://www.microsoft.com/downloads/en/details.aspx?FamilyID=A7B7A05E-6DE6-4D3A-A423-37BF0912DB84 To use the GUI you must have the .NET 4.0 Framework installed. This can be downloaded from http://www.microsoft.com/downloads/en/details.aspx?FamilyID=9cfb2d51-5ff4-4491-b0e5-b386f32c0992 - Updated En...ASP.NET MVC Project Awesome (jQuery Ajax helpers): 1.4: A rich set of helpers (controls) that you can use to build highly responsive and interactive Ajax-enabled Web applications. These helpers include Autocomplete, AjaxDropdown, Lookup, Confirm Dialog, Popup Form, Popup and Pager new stuff: popup WhiteSpaceFilterAttribute tested on mozilla, safari, chrome, opera, ie 9b/8/7/6nopCommerce. ASP.NET open source shopping cart: nopCommerce 1.90: To see the full list of fixes and changes please visit the release notes page (http://www.nopCommerce.com/releasenotes.aspx).TweetSharp: TweetSharp v2.0.0.0 - Preview 4: Documentation for this release may be found at http://tweetsharp.codeplex.com/wikipage?title=UserGuide&referringTitle=Documentation. Note: This code is currently preview quality. Preview 4 ChangesReintroduced fluent interface support via satellite assembly Added entities support, entity segmentation, and ITweetable/ITweeter interfaces for client development Numerous fixes reported by preview users Preview 3 ChangesNumerous fixes and improvements to core engine Twitter API coverage: a...Aura: Aura Preview 1: Rewritten from scratch. This release supports getting color only from icon of foreground window.MBG Extensions Library: MBG.Extensions_v1.3: MBG.Extensions Collections.CollectionExtensions - AddIfNew - RemoveRange (Moved From ListExtensions to here, where it should have been) Collections.EnumerableExtensions - ToCommaSeparatedList has been replaced by: Join() and ToValueSeparatedList Join is for a single line of values. ToValueSeparatedList is generally for collection and will separate each entity in the collection by a new line character - ToQueue - ToStack Core.ByteExtensions - TripleDESDecrypt Core.DateTimeExtension...myCollections: Version 1.2: New in version 1.2: Big performance improvement. New Design (Added Outlook style View, New detail view, New Groub By...) Added Sort by Media Added Manage Movie Studio Zoom preference is now saved. Media name are now editable. Added Portuguese version You can now Hide details panel Add support for FLAC tags You can now imports books from BibTex Xml file BugFixingmytrip.mvc (CMS & e-Commerce): mytrip.mvc 1.0.49.0 beta: mytrip.mvc 1.0.49.0 beta web Web for install hosting System Requirements: NET 4.0, MSSQL 2008 or MySql (auto creation table to database) if .\SQLEXPRESS auto creation database (App_Data folder) mytrip.mvc 1.0.49.0 beta src System Requirements: Visual Studio 2010 or Web Deweloper 2010 MSSQL 2008 or MySql (auto creation table to database) if .\SQLEXPRESS auto creation database (App_Data folder) Connector/Net 6.3.4, MVC3 RC WARNING For run and debug mytrip.mvc 1.0.49.0 beta src download and ...Menu and Context Menu for Silverlight 4.0: Silverlight Menu and Context Menu v2.3 Beta: - Added keyboard navigation support with access keys - Shortcuts like Ctrl-Alt-A are now supported(where the browser permits it) - The PopupMenuSeparator is now completely based on the PopupMenuItem class - Moved item manipulation code to a partial class in PopupMenuItemsControl.cs - Moved menu management and keyboard navigation code to the new PopupMenuManager class - Simplified the layout by removing the RootGrid element(all content is now placed in OverlayCanvas and is accessed by the new ...MiniTwitter: 1.62: MiniTwitter 1.62 ???? ?? ??????????????????????????????????????? 140 ?????????????????????????? ???????????????????????????????? ?? ??????????????????????????????????Phalanger - The PHP Language Compiler for the .NET Framework: 2.0 (December 2010): The release is targetted for stable daily use. With improved performance and enhanced compatibility with several latest PHP open source applications; it makes this release perfect replacement of your old PHP runtime. Changes made within this release include following and much more: Performance improvements based on real-world applications experience. We determined biggest bottlenecks and we found and removed overheads causing performance problems in many PHP applications. Reimplemented nat...Chronos WPF: Chronos v2.0 Beta 3: Release notes: Updated introduction document. Updated Visual Studio 2010 Extension (vsix) package. Added horizontal scrolling to the main window TaskBar. Added new styles for ListView, ListViewItem, GridViewColumnHeader, ... Added a new WindowViewModel class (allowing to fetch data). Added a new Navigate method (with several overloads) to the NavigationViewModel class (protected). Reimplemented Task usage for the WorkspaceViewModel.OnDelete method. Removed the reflection effect...New Projects:WinK: WinK Project1000 bornes: This project is the adaptation of the famous French card game 1000 bornes (http://en.wikipedia.org/wiki/Mille_Bornes) There will be 3 types of clients: - Windows Application (WPF) - Internet Application (ASP.NET, Ajax) - Silverlight Application It's developed in C#.AutomaTones: BDSA Project 2010. Team Anders is developing an application that uses automatons to generate music.EIRENE: UnknownFinal: TDD driven analize of avalable tdd frameworks ect.HomeGrown Database Project tools: A set of tools that can be used to deploy Visual Studio SQL Databse and Server Projects. Developed using Visual Basic .Net 4.0mcssolution: no summaryMobile-enabled ASP.NET Web Forms / MVC application samples: Code samples for the whitepaper "Add mobile pages to your ASP.NET Web Forms / MVC application" linked from http://asp.net/mobileMSDI Projects: www.msdi.cnObject TreeView Visualizer: This is a Helper Library for easy Access to Visual a Object to an treeview. Nice feature to display data, if an error happen. One Place To Rule Them All: Desktop system to manage basics system functions in 3d environmant. Optra also provide community support and easy transfer data and setups between varius devices using xmpp protocol and OpenFire jabber server.Performance Data Suite: The Performance Data Suite will help you to monitor, analyze and optimize your server infrastructure. There will be predefined sets of data collections(e.g. MySQL, Apache, IIS) but it will also help you to create collections on your own.Secure Group Communication in AdHoc Networks: Secure Group Communication in AdHoc Networksimweb: simweb - is a research project which own by GCR and all its copyright belong to GCR. You can download the code for reference only but not able to be commercial without a fees.starLiGHT.Engine: starLiGHT.Engine is a set of libraries for indie game developers using XNA. It is in development for some years now as a closed source project. Now I will release some (most) parts as Open Source (dual licensing).UMC? ???? .NET ??? ?? ???? ???: ???(Junil, Um)? ???? .NET ???? ?? ?? ???? ??? ???.University of Ottawa tour for WP7: This is a Windows Phone 7 tour guide app for the University of Ottawa. vutpp for VS2010: C++ UnitTest Gui Addin????: ????

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• Advice for a computer science sophomore in college?

  - by RDas

  Hi Everyone! I'm a sophomore in college majoring in Computer Science and Math. I have always loved programming. I started programming in C when I was nine years old and over the years I've picked up Visual Basic, C#, Java, C++, JavaScript, Objective-C, Python, Ruby, elementary Haskell and elementary Erlang, and I learned Perl back in the day which I've mostly forgotten. I have not done much network programming. I have done CGI programming, but that was about six/seven years ago. I've done some socket programming and written (school) programs to do interprocess communication, which I understood and liked. I'm taking a course on client/server programming and another one on network security next semester, which I am really looking forward to. I'm seeking advice on how to proceed with future learning. I've mostly done application (mobile and desktop) development, not much of web development. I'd like to pick up some web development this coming semester. Since I know Ruby and Python, should I start by learning Django and/or Rails? Any other suggestions on starting web development? I have a good understanding of HTML and CSS. Also, I'd also like to know how hard it is to pick up and be good (read: productive) in functional programming languages coming from a purely structured/object oriented background? I've been reading up on Erlang and Haskell, and I'd like to know your opinions on whether it's worth my time trying to learn them. What about Lisp, Scheme and other functional languages? Any help/ideas would be really appreciated.

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• Machine Check Exception

  - by Karl Entwistle

  When trying to install ubuntu-12.04-desktop-amd64.iso from USB I get one of the following errors http://en.wikipedia.org/wiki/Machine_Check_Exception states the error can occur due to -poorly fitted heatsink/computer fans (the same problem can happen with excessive dust in the CPU fan) -an overloaded internal or external power supply (fixable by upgrading) So I tried the following -Using rubbing alcohol to remove all the thermal paste from the CPU and heatsink, I then reseated the CPU after checking all the pins on the MOBO, everything seems fine. -Boot without the GPU to see if was the PSU that is being over stressed. -Removing all RAM apart from one stick and running a Memtest86 which it passed -Using Ubuntu 10.04.4 Desktop 64 bit (Different USB slots and USB sticks) -Using Ubuntu 12.04 Desktop 64 bit (Different USB slots and USB sticks) -Reset the BIOS using the Clear CMOS jumper -Removing all HD power cables and SATA cables -Updating the BIOS from F2 to F6 My PC is using the following parts. -Gigabyte GA-Z77-DS3H (F6 BIOS) -Intel Core i7 3770K 3.5GHz Socket 1155 -G-Skill 8GB (2x4GB) DDR3 1600Mhz RipjawsX Memory Kit CL9 (9-9-9-24) 1.5V -Be Quiet Shadow Rock Pro -Be Quiet Pure Power 730W Modular PSU -Sapphire HD 6870 1GB GDDR5 DVI HDMI DisplayPort PCI-E Graphics Card Any ideas?

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• guvcview recording video and audio out of synchronisation in Ubuntu 10.10

  - by SIJAR

  I finally got Guvcview, a great software for Logitech webcam and it does all the stuff that one wants out of it. But I'm not satisfy with the video recording, video and audio out of synchronisation also video seems to be in slow motion. Please help so that I can tweak in and get a good video recording with the webcam. Below is the log of Guvcview ------------------------------------------------------------------------------- guvcview 1.4.1 video_device: /dev/video0 vid_sleep: 0 cap_meth: 1 resolution: 640 x 480 windowsize: 1024 x 715 vert pane: 578 spin behavior: 0 mode: mjpg fps: 1/25 Display Fps: 0 bpp: 0 hwaccel: 1 avi_format: 4 sound: 1 sound Device: 4 sound samp rate: 0 sound Channels: 0 Sound delay: 0 nanosec Sound Format: 85 Pan Step: 2 degrees Tilt Step: 2 degrees Video Filter Flags: 0 image inc: 0 profile(default):/home/sijar/default.gpfl starting portaudio... bt_audio_service_open: connect() failed: Connection refused (111) bt_audio_service_open: connect() failed: Connection refused (111) bt_audio_service_open: connect() failed: Connection refused (111) bt_audio_service_open: connect() failed: Connection refused (111) Cannot connect to server socket err = No such file or directory Cannot connect to server socket jack server is not running or cannot be started language catalog= dir:/usr/share/locale type:UTF-8 lang:en_US.utf8 cat:guvcview.mo mjpg: setting format to 1196444237 capture method = 1 video device: /dev/video0 libv4lconvert: warning more framesizes then I can handle! libv4lconvert: warning more framesizes then I can handle! /dev/video0 - device 1 libv4lconvert: warning more framesizes then I can handle! libv4lconvert: warning more framesizes then I can handle! Init. UVC Camera (046d:0825) (location: usb-0000:00:1d.7-5) { pixelformat = 'YUYV', description = 'YUV 4:2:2 (YUYV)' } { discrete: width = 640, height = 480 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 160, height = 120 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 176, height = 144 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 320, height = 176 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 320, height = 240 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 352, height = 288 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 432, height = 240 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 544, height = 288 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 640, height = 360 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, ... repeats a couple of times ... vid:046d pid:0825 driver:uvcvideo Adding control for Pan (relative) UVCIOC_CTRL_ADD - Error: Operation not permitted checking format: 1196444237 VIDIOC_G_COMP:: Invalid argument compression control not supported fps is set to 1/25 drawing controls control[0]: 0x980900 Brightness, 0:255:1, default 128 control[0]: 0x980901 Contrast, 0:255:1, default 32 control[0]: 0x980902 Saturation, 0:255:1, default 32 control[0]: 0x98090c White Balance Temperature, Auto, 0:1:1, default 1 control[0]: 0x980913 Gain, 0:255:1, default 0 control[0]: 0x980918 Power Line Frequency, 0:2:1, default 2 control[0]: 0x98091a White Balance Temperature, 0:10000:10, default 4000 control[0]: 0x98091b Sharpness, 0:255:1, default 24 control[0]: 0x98091c Backlight Compensation, 0:1:1, default 1 control[0]: 0x9a0901 Exposure, Auto, 0:3:1, default 3 control[0]: 0x9a0902 Exposure (Absolute), 1:10000:1, default 166 control[0]: 0x9a0903 Exposure, Auto Priority, 0:1:1, default 0 resolutions of format(2) = 19 frame rates of 1º resolution=6 Def. Res: 0 numb. fps:6 --------------------------------------- device #0 Name = Intel 82801DB-ICH4: Intel 82801DB-ICH4 (hw:0,0) Host API = ALSA Max inputs = 2, Max outputs = 2 Def. low input latency = 0.012 Def. low output latency = 0.012 Def. high input latency = 0.046 Def. high output latency = 0.046 Def. sample rate = 44100.00 --------------------------------------- device #1 Name = Intel 82801DB-ICH4: Intel 82801DB-ICH4 - MIC ADC (hw:0,1) Host API = ALSA Max inputs = 2, Max outputs = 0 Def. low input latency = 0.011 Def. low output latency = -1.000 Def. high input latency = 0.043 Def. high output latency = -1.000 Def. sample rate = 48000.00 --------------------------------------- device #2 Name = Intel 82801DB-ICH4: Intel 82801DB-ICH4 - MIC2 ADC (hw:0,2) Host API = ALSA Max inputs = 2, Max outputs = 0 Def. low input latency = 0.011 Def. low output latency = -1.000 Def. high input latency = 0.043 Def. high output latency = -1.000 Def. sample rate = 48000.00 --------------------------------------- device #3 Name = Intel 82801DB-ICH4: Intel 82801DB-ICH4 - ADC2 (hw:0,3) Host API = ALSA Max inputs = 2, Max outputs = 0 Def. low input latency = 0.011 Def. low output latency = -1.000 Def. high input latency = 0.043 Def. high output latency = -1.000 Def. sample rate = 48000.00 --------------------------------------- device #4 Name = Intel 82801DB-ICH4: Intel 82801DB-ICH4 - IEC958 (hw:0,4) Host API = ALSA Max inputs = 0, Max outputs = 2 Def. low input latency = -1.000 Def. low output latency = 0.011 Def. high input latency = -1.000 Def. high output latency = 0.043 Def. sample rate = 48000.00 --------------------------------------- device #5 Name = USB Device 0x46d:0x825: USB Audio (hw:1,0) Host API = ALSA Max inputs = 1, Max outputs = 0 Def. low input latency = 0.011 Def. low output latency = -1.000 Def. high input latency = 0.043 Def. high output latency = -1.000 Def. sample rate = 48000.00 --------------------------------------- device #6 Name = front Host API = ALSA Max inputs = 0, Max outputs = 2 Def. low input latency = -1.000 Def. low output latency = 0.012 Def. high input latency = -1.000 Def. high output latency = 0.046 Def. sample rate = 44100.00 --------------------------------------- device #7 Name = iec958 Host API = ALSA Max inputs = 0, Max outputs = 2 Def. low input latency = -1.000 Def. low output latency = 0.011 Def. high input latency = -1.000 Def. high output latency = 0.043 Def. sample rate = 48000.00 --------------------------------------- device #8 Name = spdif Host API = ALSA Max inputs = 0, Max outputs = 2 Def. low input latency = -1.000 Def. low output latency = 0.011 Def. high input latency = -1.000 Def. high output latency = 0.043 Def. sample rate = 48000.00 --------------------------------------- device #9 Name = pulse Host API = ALSA Max inputs = 32, Max outputs = 32 Def. low input latency = 0.012 Def. low output latency = 0.012 Def. high input latency = 0.046 Def. high output latency = 0.046 Def. sample rate = 44100.00 --------------------------------------- device #10 Name = dmix Host API = ALSA Max inputs = 0, Max outputs = 2 Def. low input latency = -1.000 Def. low output latency = 0.043 Def. high input latency = -1.000 Def. high output latency = 0.043 Def. sample rate = 48000.00 --------------------------------------- device #11 [ Default Input, Default Output ] Name = default Host API = ALSA Max inputs = 32, Max outputs = 32 Def. low input latency = 0.012 Def. low output latency = 0.012 Def. high input latency = 0.046 Def. high output latency = 0.046 Def. sample rate = 44100.00 ---------------------------------------------- SampleRate:0 Channels:0 Video driver: x11 A window manager is available VIDIOC_S_EXT_CTRLS for multiple controls failed (error -1) using VIDIOC_S_CTRL for user class controls control(0x0098091a) "White Balance Temperature" failed to set (error -1) VIDIOC_S_EXT_CTRLS for multiple controls failed (error -1) using VIDIOC_S_EXT_CTRLS on single controls for class: 0x009a0000 control(0x009a0902) "Exposure (Absolute)" failed to set (error -1) VIDIOC_S_EXT_CTRLS for multiple controls failed (error -1) using VIDIOC_S_CTRL for user class controls control(0x0098091a) "White Balance Temperature" failed to set (error -1) VIDIOC_S_EXT_CTRLS for multiple controls failed (error -1) using VIDIOC_S_EXT_CTRLS on single controls for class: 0x009a0000 control(0x009a0902) "Exposure (Absolute)" failed to set (error -1) Cap Video toggled: 1 (/home/sijar/Videos/Webcam) 25371756K bytes free on a total of 39908968K (used: 36 %) treshold=51200K using audio codec: 0x0055 Audio frame size is 1152 samples for selected codec IO thread started...OK [libx264 @ 0x8cbd8b0]using cpu capabilities: MMX2 SSE2 Cache64 [libx264 @ 0x8cbd8b0]profile Baseline, level 3.0 [libx264 @ 0x8cbd8b0]non-strictly-monotonic PTS shift sound by -9 ms shift sound by -9 ms shift sound by -9 ms AUDIO: droping audio data AUDIO: droping audio data AUDIO: droping audio data AUDIO: droping audio data AUDIO: droping audio data ... repeats a couple of times ... AUDIO: droping audio data (/home/sijar/Videos/Webcam) 25371748K bytes free on a total of 39908968K (used: 36 %) treshold=51200K AUDIO: droping audio data AUDIO: droping audio data ... repeats a couple of times ... Cap Video toggled: 0 Shuting Down IO Thread AUDIO: droping audio data stop= 4426644744000 start=4416533023000 VIDEO: 146 frames in 10111.000000 ms = 14.439719 fps Stoping audio stream Closing audio stream... close avi Last message repeated 145 times [libx264 @ 0x8cbd8b0]frame I:2 Avg QP:14.10 size: 24492 [libx264 @ 0x8cbd8b0]frame P:103 Avg QP:16.06 size: 20715 [libx264 @ 0x8cbd8b0]mb I I16..4: 48.4% 0.0% 51.6% [libx264 @ 0x8cbd8b0]mb P I16..4: 57.5% 0.0% 0.0% P16..4: 40.2% 0.0% 0.0% 0.0% 0.0% skip: 2.3% [libx264 @ 0x8cbd8b0]final ratefactor: 62.05 [libx264 @ 0x8cbd8b0]coded y,uvDC,uvAC intra: 79.7% 92.2% 68.4% inter: 62.4% 87.5% 48.0% [libx264 @ 0x8cbd8b0]i16 v,h,dc,p: 23% 17% 41% 19% [libx264 @ 0x8cbd8b0]i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 24% 26% 2% 5% 3% 3% 3% 4% [libx264 @ 0x8cbd8b0]i8c dc,h,v,p: 53% 20% 23% 4% [libx264 @ 0x8cbd8b0]ref P L0: 63.0% 37.0% [libx264 @ 0x8cbd8b0]kb/s:-0.00 total frames encoded: 0 total audio frames encoded: 0 IO thread finished...OK IO Thread finished enabling controls Cap Video toggled: 1 (/home/sijar/Videos/Webcam) 25379744K bytes free on a total of 39908968K (used: 36 %) treshold=51200K using audio codec: 0x0055 Audio frame size is 1152 samples for selected codec IO thread started...OK [libx264 @ 0x8cfba20]using cpu capabilities: MMX2 SSE2 Cache64 [libx264 @ 0x8cfba20]profile Baseline, level 3.0 [libx264 @ 0x8cfba20]non-strictly-monotonic PTS shift sound by -236 ms shift sound by -236 ms shift sound by -236 ms (/home/sijar/Videos/Webcam) 25377044K bytes free on a total of 39908968K (used: 36 %) treshold=51200K (/home/sijar/Videos/Webcam) 25373408K bytes free on a total of 39908968K (used: 36 %) treshold=51200K AUDIO: droping audio data AUDIO: droping audio data AUDIO: droping audio data AUDIO: droping audio data AUDIO: droping audio data AUDIO: droping audio data ... repeats a couple of times ... (/home/sijar/Videos/Webcam) 25370696K bytes free on a total of 39908968K (used: 36 %) treshold=51200K AUDIO: droping audio data AUDIO: droping audio data AUDIO: droping audio data ... repeats a couple of times ... (/home/sijar/Videos/Webcam) 25367680K bytes free on a total of 39908968K (used: 36 %) treshold=51200K (/home/sijar/Videos/Webcam) 25364052K bytes free on a total of 39908968K (used: 36 %) treshold=51200K (/home/sijar/Videos/Webcam) 25360312K bytes free on a total of 39908968K (used: 36 %) treshold=51200K (/home/sijar/Videos/Webcam) 25356628K bytes free on a total of 39908968K (used: 36 %) treshold=51200K (/home/sijar/Videos/Webcam) 25352908K bytes free on a total of 39908968K (used: 36 %) treshold=51200K (/home/sijar/Videos/Webcam) 25349316K bytes free on a total of 39908968K (used: 36 %) treshold=51200K (/home/sijar/Videos/Webcam) 25345552K bytes free on a total of 39908968K (used: 36 %) treshold=51200K (/home/sijar/Videos/Webcam) 25341828K bytes free on a total of 39908968K (used: 36 %) treshold=51200K (/home/sijar/Videos/Webcam) 25338092K bytes free on a total of 39908968K (used: 36 %) treshold=51200K (/home/sijar/Videos/Webcam) 25334412K bytes free on a total of 39908968K (used: 36 %) treshold=51200K Cap Video toggled: 0 Shuting Down IO Thread stop= 4708817235000 start=4578624714000 VIDEO: 1604 frames in 130192.000000 ms = 12.320265 fps Stoping audio stream Closing audio stream... close avi Last message repeated 1603 times [libx264 @ 0x8cfba20]frame I:16 Avg QP:14.78 size: 42627 [libx264 @ 0x8cfba20]frame P:1547 Avg QP:16.44 size: 28599 [libx264 @ 0x8cfba20]mb I I16..4: 21.6% 0.0% 78.4% [libx264 @ 0x8cfba20]mb P I16..4: 28.1% 0.0% 0.0% P16..4: 70.5% 0.0% 0.0% 0.0% 0.0% skip: 1.4% [libx264 @ 0x8cfba20]final ratefactor: 88.17 [libx264 @ 0x8cfba20]coded y,uvDC,uvAC intra: 74.4% 95.8% 83.2% inter: 75.2% 94.6% 69.2% [libx264 @ 0x8cfba20]i16 v,h,dc,p: 27% 17% 40% 16% [libx264 @ 0x8cfba20]i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 25% 21% 3% 6% 4% 5% 4% 7% [libx264 @ 0x8cfba20]i8c dc,h,v,p: 61% 18% 18% 4% [libx264 @ 0x8cfba20]ref P L0: 64.0% 36.0% [libx264 @ 0x8cfba20]kb/s:-0.00 total frames encoded: 0 total audio frames encoded: 0 IO thread finished...OK IO Thread finished enabling controls Shuting Down Thread Thread terminated... cleaning Thread allocations: 100% SDL Quit Video Thread finished write /home/sijar/.guvcviewrc OK free audio mutex closed v4l2 strutures free controls free controls - vidState cleaned allocations - 100% Closing portaudio ...OK Closing GTK... OK

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• Unable to start Apache on Ubuntu 12.10: no listening sockets available

  - by michalstanko

  I'm unable to start apache2 installed using apt-get. I'm getting the very same error on 2 separate Ubuntu 12.10 installations, one on my desktop PC, the other one running in VirtualBox: michal@michaltest:~$ sudo service apache2 start * Starting web server apache2 apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName no listening sockets available, shutting down Unable to open logs Action 'start' failed. The Apache error log may have more information. [fail] lsof says: michal@michaltest:/var/log/apache2$ sudo lsof -i :80 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME ubuntu-ge 2074 michal 11u IPv4 23978 0t0 TCP michaltest.local:47578->mulberry.canonical.com:http (CLOSE_WAIT) firefox 25194 michal 71u IPv4 42477 0t0 TCP michaltest.local:59793->69.59.197.29:http (ESTABLISHED) firefox 25194 michal 76u IPv4 41834 0t0 TCP michaltest.local:59698->69.59.197.29:http (ESTABLISHED) gvfsd-htt 25320 michal 12u IPv4 42568 0t0 TCP michaltest.local:56203->lb260.amst.cotendo.net:http (CLOSE_WAIT) netstat says: michal@michaltest:/var/log/apache2$ sudo netstat -lnp | grep '80' unix 2 [ ACC ] STREAM LISTENING 8030 876/acpid /var/run/acpid.socket /var/log/apache2/error.log: [Thu Nov 08 11:13:30 2012] [notice] Apache/2.2.22 (Ubuntu) configured -- resuming normal operations [Thu Nov 08 11:17:32 2012] [notice] caught SIGTERM, shutting down /etc/apache2/ports.conf: NameVirtualHost *:80 Listen 80 <IfModule mod_ssl.c> Listen 443 </IfModule> <IfModule mod_gnutls.c> Listen 443 </IfModule> Thanks for your help. EDIT #1: michal@michaltest:~$ sudo netstat -ano | grep '443' tcp 54 0 10.0.2.15:58504 91.189.92.70:443 CLOSE_WAIT off (0.00/0/0)

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• Problem running Qreator on Xubuntu-14.04

  - by Seyed Mohammad

  I installed Qreator using apt-get on Xubuntu-14.04: $ sudo apt-get install qreator But the application fails to start! When I try to run it via Terminal, the following error messages are printed and the program aborts: $ qreator ** (qreator:3859): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-Gh2FPHrMr2: Connection refused No handlers could be found for logger "qreator_lib" Traceback (most recent call last): File "/usr/bin/qreator", line 47, in <module> qreator.main() File "/usr/lib/python2.7/dist-packages/qreator/__init__.py", line 63, in main window = QreatorWindow.QreatorWindow() File "/usr/lib/python2.7/dist-packages/qreator_lib/Window.py", line 48, in __new__ new_object.finish_initializing(builder) File "/usr/lib/python2.7/dist-packages/qreator/QreatorWindow.py", line 79, in finish_initializing self.init_qr_types() File "/usr/lib/python2.7/dist-packages/qreator/QreatorWindow.py", line 135, in init_qr_types self.qr_types = [d(self.update_qr_code) for d in QRCodeType.dataformats] File "/usr/lib/python2.7/dist-packages/qreator/qrcodes/QRCodeType.py", line 71, in __init__ self.create_widget() # pylint: disable=E1101 File "/usr/lib/python2.7/dist-packages/qreator/qrcodes/QRCodeLocation.py", line 29, in create_widget self.widget = QRCodeLocationGtk(self.qr_code_update_func) File "/usr/lib/python2.7/dist-packages/qreator/qrcodes/QRCodeLocationGtk.py", line 49, in __init__ latitude, longitude = get_current_location() File "/usr/lib/python2.7/dist-packages/qreator/qrcodes/QRCodeLocationGtk.py", line 109, in get_current_location '/org/freedesktop/Geoclue/Providers/Hostip') File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object follow_name_owner_changes=follow_name_owner_changes) File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in __init__ self._named_service = conn.activate_name_owner(bus_name) File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in activate_name_owner self.start_service_by_name(bus_name) File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in start_service_by_name 'su', (bus_name, flags))) File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking message, timeout) dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Geoclue.Providers.Hostip was not provided by any .service files How can I fix this ?

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• Ubuntu.sh on Android Phone

  - by pjtatlow

  So today I noticed something weird on my phone. I used a terminal emulator to see what I could do with it, and noticed that there is a file called ubuntu.sh. I tried to run it and got all sorts of permission denied errors, and then I decided to root my phone. But now I'm nervous to run it, does anyone know what it does or why it is there? edit I forgot to mention that I have an AT&T Morotola Atrix 4G running Android 2.3.6. Also when I use the app SSHDroid to go into my phone from my Ubuntu machine, I'm greeted with this: "The programs included with the Ubuntu system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. To access official Ubuntu documentation, please visit: http://help.ubuntu.com/" Also, here are the contents of ubuntu.sh #!/bin/sh export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin export LD_LIBRARY_PATH=/usr/lib:/usr/local/lib # make sure no left-over pidfiles, etc. ####################################### rm -fr /var/run/* rm -fr /var/lock/* chmod 666 /system/usr/keychars/* rm -f /tmp/tab* mkdir -p /home/adas/Desktop chmod 755 /home/adas/Desktop chown -R adas.adas /home/adas/Desktop [ -x /usr/bin/firefox-install-profile ] && /usr/bin/firefox-install-profile [ -x /usr/local/bin/check-citrix-certs.sh ] && /usr/local/bin/check-citrix-certs.sh [ -x /usr/bin/migrate-webapps ] && /usr/bin/migrate-webapps # boot scripts ############## /etc/init.d/rc S # lock down /var for CTS ######################## chown root.adas /var/tmp chown root.adas /var/lock chmod 775 /var/tmp chmod 775 /var/lock chmod 666 /dev/socket/dbus chmod 666 /dev/null # runlevel 2 scripts #################### /etc/init.d/rc 2 cp /sdcard/*.lic /data/ chmod 666 /data/*.lic This is really strange, any ideas?

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• Node.js MMO - process and/or map division

  - by Gipsy King

  I am in the phase of designing a mmo browser based game (certainly not massive, but all connected players are in the same universe), and I am struggling with finding a good solution to the problem of distributing players across processes. I'm using node.js with socket.io. I have read this helpful article, but I would like some advice since I am also concerned with different processes. Solution 1: Tie a process to a map location (like a map-cell), connect players to the process corresponding to their location. When a player performs an action, transmit it to all other players in this process. When a player moves away, he will eventually have to connect to another process (automatically). Pros: Easier to implement Cons: Must divide map into zones Player reconnection when moving into a different zone is probably annoying If one zone/process is always busy (has players in it), it doesn't really load-balance, unless I split the zone which may not be always viable There shouldn't be any visible borders Solution 1b: Same as 1, but connect processes of bordering cells, so that players on the other side of the border are visible and such. Maybe even let them interact. Solution 2: Spawn processes on demand, unrelated to a location. Have one special process to keep track of all connected player handles, their location, and the process they're connected to. Then when a player performs an action, the process finds all other nearby players (from the special player-process-location tracking node), and instructs their matching processes to relay the action. Pros: Easy load balancing: spawn more processes Avoids player reconnecting / borders between zones Cons: Harder to implement and test Additional steps of finding players, and relaying event/action to another process If the player-location-process tracking process fails, all other fail too I would like to hear if I'm missing something, or completely off track.

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• mysql service do not launch

  - by ted

  Sorry for my English; I was trying to create db with rake in RoR application that has been configured for MySQL(gem installed, settings changed). After that attempt mysql-server broke: d@calister:~$ mysql ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) mysqld is not running at all: d@calister:~$ ps aux | grep mysql d 3769 0.0 0.0 4368 832 pts/0 S+ 18:03 0:00 grep --color=auto mysql And also it doesn't seem it would like to run: d@calister:~$ sudo service mysql start start: Job failed to start Any suggestions? Thanks EDIT: d@calister:~$ sudo -u mysql mysqld 120520 18:45:11 [Note] Plugin 'FEDERATED' is disabled. mysqld: Table 'mysql.plugin' doesn't exist 120520 18:45:11 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it. 120520 18:45:11 InnoDB: The InnoDB memory heap is disabled 120520 18:45:11 InnoDB: Mutexes and rw_locks use GCC atomic builtins 120520 18:45:11 InnoDB: Compressed tables use zlib 1.2.3.4 120520 18:45:11 InnoDB: Initializing buffer pool, size = 128.0M 120520 18:45:11 InnoDB: Completed initialization of buffer pool 120520 18:45:11 InnoDB: highest supported file format is Barracuda. 120520 18:45:12 InnoDB: Waiting for the background threads to start 120520 18:45:13 InnoDB: 1.1.8 started; log sequence number 1589459 120520 18:45:13 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

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• Continuous Integration using Docker

  - by Leon Mergen

  One of the main advantages of Docker is the isolated environment it brings, and I want to leverage that advantage in my continuous integration workflow. A "normal" CI workflow goes something like this: Poll repository for changes Pull from repository Install dependencies Run tests In a Dockerized workflow, it would be something like this: Poll repository for changes Pull from repository Build docker image Run docker image as container Run tests Kill docker container My problem is with the "run tests" step: since Docker is an isolated environment, intuitively I would like to treat it as one; this means the preferred method of communication are sockets. However, this only works well in certain situations (a webapp, for example). When testing different kind of services (for example, a background service that only communicated with a database), a different approach would be required. What is the best way to approach this problem? Is it a problem with my application's design, and should I design it in a more TDD, service-oriented way that always listens on some socket? Or should I just give up on isolation, and do something like this: Poll repository for changes Pull from repository Build docker image Run docker image as container Open SSH session into container Run tests Kill docker container SSH'ing into the container seems like an ugly solution to me, since it requires deep knowledge of the contents of the container, and thus break the isolation. I would love to hear SO's different approaches to this problem.

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• Tips for debugging Samba performance?

  - by j-g-faustus

  Samba gives me 24 MB/s read and 44 MB/s write, while ftp gives 97 and 112 MB/s under the same circumstances. The documentation says that Generally, you should find that Samba performs similarly to ftp at raw transfer speed. In my case it clearly doesn't. Where can I find tips on how to debug Samba performance? Or alternatively tips for replacing Samba with something else? (I can't use ftp, unfortunately, as I need something that can be used with rsync/rsnapshot.) More details: Both computers are running Ubuntu 10.10 (using Samba because I have a Mac as well) The Samba share is on a local home network, mounted as $ mount ... //server.local/share/ on /mnt/share type cifs (rw,mand) Samba performance was tested by copying (cp) a single file of ~4GB to and from the share, using time for timing and calculating transfer speed by hand. ftp performance are the numbers from the ftp client for get/put of the same file. iperf gives network speed ~900 Mbits/s bonnie++ gives disk speeds 200 MB/s on both sides for block reads as well as block writes Tried changing the parameters suggested in the performance tuning HOWTO (read/write raw, read size, socket options), most of them made little to no difference. (The one that made a difference caused write speed to drop 50%.)

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• Remote Data connection in iphone app

  - by Tariq- iPHONE Programmer

  Hello, i am working with Social Networking iphone app which require remote data connection. So i hired a php developer in order to provide me RESTful services. But when i start working with him, he arguing me that he will not make stored procedures and web services. Instead of he suggested me to pass query as a parameter. Suppose If I have to call Search service, he told me to send POST request with 3 parameters: Query="select * from users", username=abd and password = 123 And i thing there is no such architecture in order to use remote data. Then he is saying it is possible through socket programming. And I am 100% sure this is not an appropriate way to access remote data. This is simply illogical. Thousands of iphone application using REST/SOAP services to make remote data connection He just declined me to provide RESTful services. Please its my heartily advice to all developers that post your own views over here. So that I can show to that developers that these are the views from all developers worldwide.

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• How to make game sessions like "with friends" games?

  - by Miguel lugo

  I want to make a game like "words with friends" or "chess with friends" or "Draw Something" or any of the other online multiplayer type games that are based around friends having game sessions with each other. I have made one app before that had no online features so I know the basics of objective-C and xCode. I looked up facebook connect so I know how to make friends find other friends to play with through Facebook. Just not how to make the gaming session. I only need my game to send a small array (or XML if it's better) of strings and integers from one iPhone to the other as each iPhone takes a turn. I'm NOT sending some complex video or anything like in "Draw Something." I was hoping someone could point me in the right direction (whether link to website or book or just a general idea) for how to do gaming sessions between two iPhones. I read this tutorial http://www.raywenderlich.com/3932/how-to-create-a-socket-based-iphone-app-and-server but it seems to be more about having two iPhones communicate over a server on a laptop or through the same wifi, not how to have iPhones game together over any Internet connection like in "with friends" games. I've tried to research this in other places but I'm never quite sure if what the articles I find are talking about is related to what I want or not. Someone please just point me in the right direction or give me a general outline of what to do. I will look up the specifics on my own once I know what to look for. Thank you.

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• Android device unable to obtain ip address connecting to AP created with Hostapd

  - by user114392

  I have a wired internet connection that works behind an authenticated proxy server. I followed the steps mentioned here and managed to create a hotspot which my google nexus 7 detects. However, it seems stuck at "obtaining an ip address" and is not able to connect to the internet. I initially received the following error message when running the script in the terminal: dnsmasq: failed to create listening socket for 127.0.0.1: Address already in use [fail] I figured it is because of a conflict with the network manager, I commented out the "dns=dnsmasq" line in the nm configuration file. After a network-manager restart, the first error doesn't show up but I get the following: Configuration file: /etc/hostapd.conf Failed to create interface mon.wlan0: -23 (Too many open files in system) Try to remove and re-create mon.wlan0 In both cases, however, the hotspot is created and is detected by my android device. only that it cannot "obtain an ip address" and connect to it. Is it because my eth0 connects via a proxy server? Or could there be something wrong with the dnsmasq config? Any help would be appreciated.

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