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• How to remove default header from WCF REST Outgoing Response?

  - by bmsantos

  The following C# WCF based REST service gives me some undesired headers that I'm not sure if I can remove them trough the API. The interface: [ServiceContract] public interface IControlSystem { [OperationContract] [WebGet] System.IO.Stream About(); } The implementation: public class ControlSystem : IControlSystem { public System.IO.Stream About() { return new System.IO.MemoryStream(ASCIIEncoding.Default.GetBytes("Hello World")); } } Out of a raw socket connection it gives the following response: HTTP/1.1 200 OK Server: ASP.NET Development Server/9.0.0.0 Date: Tue, 15 Jun 2010 13:12:51 GMT X-AspNet-Version: 2.0.50727 Cache-Control: private Content-Type: application/octet-stream Content-Length: 39 Connection: Close Hello World Question is, is it possible to get the server to not report anything other than the actual message? Need it in some calls so due to some small embedded device clients that will try to connect to the server and I would like to minimize the amount of parsing. Thanks, B.

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• Accessing a Service from within an XNA Content Pipeline Extension

  - by David Wallace

  I need to allow my content pipeline extension to use a pattern similar to a factory. I start with a dictionary type: public delegate T Mapper<T>(MapFactory<T> mf, XElement d); public class MapFactory<T> { Dictionary<string, Mapper<T>> map = new Dictionary<string, Mapper<T>>(); public void Add(string s, Mapper<T> m) { map.Add(s, m); } public T Get(XElement xe) { if (xe == null) throw new ArgumentNullException( "Invalid document"); var key = xe.Name.ToString(); if (!map.ContainsKey(key)) throw new ArgumentException( key + " is not a valid key."); return map[key](this, xe); } public IEnumerable<T> GetAll(XElement xe) { if (xe == null) throw new ArgumentNullException( "Invalid document"); foreach (var e in xe.Elements()) { var val = e.Name.ToString(); if (map.ContainsKey(val)) yield return map[val](this, e); } } } Here is one type of object I want to store: public partial class TestContent { // Test type public string title; // Once test if true public bool once; // Parameters public Dictionary<string, object> args; public TestContent() { title = string.Empty; args = new Dictionary<string, object>(); } public TestContent(XElement xe) { title = xe.Name.ToString(); args = new Dictionary<string, object>(); xe.ParseAttribute("once", once); } } XElement.ParseAttribute is an extension method that works as one might expect. It returns a boolean that is true if successful. The issue is that I have many different types of tests, each of which populates the object in a way unique to the specific test. The element name is the key to MapFactory's dictionary. This type of test, while atypical, illustrates my problem. public class LogicTest : TestBase { string opkey; List<TestBase> items; public override bool Test(BehaviorArgs args) { if (items == null) return false; if (items.Count == 0) return false; bool result = items[0].Test(args); for (int i = 1; i < items.Count; i++) { bool other = items[i].Test(args); switch (opkey) { case "And": result &= other; if (!result) return false; break; case "Or": result |= other; if (result) return true; break; case "Xor": result ^= other; break; case "Nand": result = !(result & other); break; case "Nor": result = !(result | other); break; default: result = false; break; } } return result; } public static TestContent Build(MapFactory<TestContent> mf, XElement xe) { var result = new TestContent(xe); string key = "Or"; xe.GetAttribute("op", key); result.args.Add("key", key); var names = mf.GetAll(xe).ToList(); if (names.Count() < 2) throw new ArgumentException( "LogicTest requires at least two entries."); result.args.Add("items", names); return result; } } My actual code is more involved as the factory has two dictionaries, one that turns an XElement into a content type to write and another used by the reader to create the actual game objects. I need to build these factories in code because they map strings to delegates. I have a service that contains several of these factories. The mission is to make these factory classes available to a content processor. Neither the processor itself nor the context it uses as a parameter have any known hooks to attach an IServiceProvider or equivalent. Any ideas?

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• SO_LINGER and closing sockets(WINSOCK)

  - by Johnny Walked

  hey. im writing a multithreaded winsock application and im having some issues with closing the sockets. first of all, is there a limit for a number of simultaneously open sockets? lets say like 32 sockets all in once. i establish a connection on one of the sockets, and passing information and it all goes right. problem is when i disconnect the socket and then reconnect to the same destination, i get a RST from the server after my SYN. i dont have the code for the server app so i cant debug it. when i used SO_LINGER and it sent a RST flag at the end of each session - it worked. but i dont want to end my connections this way. when not using SO_LINGER a FIN flag was sent but it seems the connection was not really closed. any help? thanks

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• What useful GDB scripts have you used/written?

  - by nik

  People use gdb on and off for debugging, of course there are lots of other debugging tools across the varied OSes, with and without GUI and, maybe other fancy IDE features. I would like to know what useful gdb scripts you have written and liked. While, I do not mean a dump of commands in a something.gdb file that you source to pull out a bunch of data, if that made your day, go ahead and talk about it. Lets think conditional processing, control loops and functions written for more elegant and refined programming to debug and, maybe even for whitebox testing Things get interesting when you start debugging remote systems (say, over a serial/ethernet interface) And, what if the target is a multi-processor (and, multithreaded) system Let me put a simple case as an example... Say, A script that traversed serially over entries to locate a bad entry in a large hash-table that is implemented on an embedded platform. That helped me debug a broken hash-table once.

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• AudioQueue recording as float

  - by niklassaers

  Hi guys, I would like to have the result from my recording as a float in the range [0.0, 1.0], alternatively [-1.0, 1.0] because of a bit of math I want to do on it. When I set my recordingformat to be in float, like this: mRecordFormat.mFormatFlags = kLinearPCMFormatFlagIsFloat; I get: Error: AudioQueueNewInput failed ('fmt?') Does this mean the hardware doesn't support recording to floats? If not, how do I set it to record in floats? If so, are there any processor-friendly ways I can convert a signed integer array to a float array? Cheers Nik

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• Installing sSMTP from SSH

  - by James

  I'm on a Web Hosting Buzz reseller account. They have some very stringent mail sending rules, including blocking of authenticated SMTP socket mail sending using PEAR. It was suggested in WHB forum that this was possible with sSMTP. I've since gotten SSH access and googled how to install sSMTP from SSH: rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-3.noarch.rpm yum install ssmtp However, the first line fails with: Retrieving http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-3.noarch.rpm error: skipping http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-3.noarch.rpm - transfer failed - Unknown or unexpected error It was a very old thread in WHB forum and the thread poster could not be reached for assistance. Any help would be much appreciated!

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• Why my VPN doesn't work anymore?

  - by xx77aBs

  I have openvpn server running on debian lenny. There is only one client - and it is running Windows 7 64-bit. This has worked for few months without any problems. And now, let's say for the last 7 days, it doesn't work at all. I connect successfully from client to the server, but I can't access anything through VPN. I have set it up so that all internet traffic is routed through VPN, and now when I connect with the client, the client can't do anything on the net (open any webpage, ping google, anything ...). Can you help me to figure out what's wrong ? I don't know where to start. I've also tried to connect to another openvpn server (I've installed and configured openvpn on another server, and when I try to connect to it result is the same). So I think there's something wrong with client ... Here is my connection log: Wed Apr 04 21:35:59 2012 OpenVPN 2.3-alpha1 Win32-MSVC++ [SSL (OpenSSL)] [LZO2] [PF_INET6] [IPv6 payload 20110522-1 (2.2.0)] built on Feb 21 2012 Enter Management Password: Wed Apr 04 21:35:59 2012 MANAGEMENT: TCP Socket listening on [AF_INET]127.0.0.10:25340 Wed Apr 04 21:35:59 2012 Need hold release from management interface, waiting... Wed Apr 04 21:36:00 2012 MANAGEMENT: Client connected from [AF_INET]127.0.0.10:25340 Wed Apr 04 21:36:00 2012 MANAGEMENT: CMD 'state on' Wed Apr 04 21:36:00 2012 MANAGEMENT: CMD 'log all on' Wed Apr 04 21:36:00 2012 MANAGEMENT: CMD 'hold off' Wed Apr 04 21:36:00 2012 MANAGEMENT: CMD 'hold release' Wed Apr 04 21:36:00 2012 WARNING: No server certificate verification method has been enabled. See http://openvpn.net/howto.html#mitm for more info. Wed Apr 04 21:36:00 2012 NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables Wed Apr 04 21:36:00 2012 Socket Buffers: R=[8192->8192] S=[8192->8192] Wed Apr 04 21:36:00 2012 MANAGEMENT: >STATE:1333568160,RESOLVE,,, Wed Apr 04 21:36:00 2012 UDPv4 link local: [undef] Wed Apr 04 21:36:00 2012 UDPv4 link remote: [AF_INET]11.22.33.44:1234 Wed Apr 04 21:36:00 2012 MANAGEMENT: >STATE:1333568160,WAIT,,, Wed Apr 04 21:36:00 2012 MANAGEMENT: >STATE:1333568160,AUTH,,, Wed Apr 04 21:36:00 2012 TLS: Initial packet from [AF_INET]11.22.33.44:1234, sid=ee329574 f15e9e04 Wed Apr 04 21:36:00 2012 VERIFY OK: depth=1, C=US, ST=CA, L=SanFrancisco, O=Fort-Funston, CN=Fort-Funston CA, [email protected] Wed Apr 04 21:36:00 2012 VERIFY OK: depth=0, C=US, ST=CA, L=SanFrancisco, O=Fort-Funston, CN=server_key, [email protected] Wed Apr 04 21:36:01 2012 Data Channel Encrypt: Cipher 'BF-CBC' initialized with 128 bit key Wed Apr 04 21:36:01 2012 Data Channel Encrypt: Using 160 bit message hash 'SHA1' for HMAC authentication Wed Apr 04 21:36:01 2012 Data Channel Decrypt: Cipher 'BF-CBC' initialized with 128 bit key Wed Apr 04 21:36:01 2012 Data Channel Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication Wed Apr 04 21:36:01 2012 Control Channel: TLSv1, cipher TLSv1/SSLv3 DHE-RSA-AES256-SHA, 1024 bit RSA Wed Apr 04 21:36:01 2012 [server_key] Peer Connection Initiated with [AF_INET]11.22.33.44:1234 Wed Apr 04 21:36:02 2012 MANAGEMENT: >STATE:1333568162,GET_CONFIG,,, Wed Apr 04 21:36:03 2012 SENT CONTROL [server_key]: 'PUSH_REQUEST' (status=1) Wed Apr 04 21:36:03 2012 PUSH: Received control message: 'PUSH_REPLY,redirect-gateway def1,route 172.16.100.1,topology net30,ping 10,ping-restart 120,ifconfig 172.16.100.6 172.16.100.5' Wed Apr 04 21:36:03 2012 OPTIONS IMPORT: timers and/or timeouts modified Wed Apr 04 21:36:03 2012 OPTIONS IMPORT: --ifconfig/up options modified Wed Apr 04 21:36:03 2012 OPTIONS IMPORT: route options modified Wed Apr 04 21:36:03 2012 ROUTE_GATEWAY 192.168.1.1/255.255.255.0 I=15 HWADDR=00:1f:1f:3f:61:55 Wed Apr 04 21:36:03 2012 do_ifconfig, tt->ipv6=0, tt->did_ifconfig_ipv6_setup=0 Wed Apr 04 21:36:03 2012 MANAGEMENT: >STATE:1333568163,ASSIGN_IP,,172.16.100.6, Wed Apr 04 21:36:03 2012 open_tun, tt->ipv6=0 Wed Apr 04 21:36:03 2012 TAP-WIN32 device [VPN] opened: \\.\Global\{E28FD52B-F6C3-4094-A36A-30CB02FAC7E8}.tap Wed Apr 04 21:36:03 2012 TAP-Win32 Driver Version 9.9 Wed Apr 04 21:36:03 2012 Notified TAP-Win32 driver to set a DHCP IP/netmask of 172.16.100.6/255.255.255.252 on interface {E28FD52B-F6C3-4094-A36A-30CB02FAC7E8} [DHCP-serv: 172.16.100.5, lease-time: 31536000] Wed Apr 04 21:36:03 2012 Successful ARP Flush on interface [31] {E28FD52B-F6C3-4094-A36A-30CB02FAC7E8} Wed Apr 04 21:36:08 2012 TEST ROUTES: 2/2 succeeded len=1 ret=1 a=0 u/d=up Wed Apr 04 21:36:08 2012 C:\Windows\system32\route.exe ADD 11.22.33.44 MASK 255.255.255.255 192.168.1.1 Wed Apr 04 21:36:08 2012 ROUTE: CreateIpForwardEntry succeeded with dwForwardMetric1=25 and dwForwardType=4 Wed Apr 04 21:36:08 2012 Route addition via IPAPI succeeded [adaptive] Wed Apr 04 21:36:08 2012 C:\Windows\system32\route.exe ADD 0.0.0.0 MASK 128.0.0.0 172.16.100.5 Wed Apr 04 21:36:08 2012 ROUTE: CreateIpForwardEntry succeeded with dwForwardMetric1=30 and dwForwardType=4 Wed Apr 04 21:36:08 2012 Route addition via IPAPI succeeded [adaptive] Wed Apr 04 21:36:08 2012 C:\Windows\system32\route.exe ADD 128.0.0.0 MASK 128.0.0.0 172.16.100.5 Wed Apr 04 21:36:08 2012 ROUTE: CreateIpForwardEntry succeeded with dwForwardMetric1=30 and dwForwardType=4 Wed Apr 04 21:36:08 2012 Route addition via IPAPI succeeded [adaptive] Wed Apr 04 21:36:08 2012 MANAGEMENT: >STATE:1333568168,ADD_ROUTES,,, Wed Apr 04 21:36:08 2012 C:\Windows\system32\route.exe ADD 172.16.100.1 MASK 255.255.255.255 172.16.100.5 Wed Apr 04 21:36:08 2012 ROUTE: CreateIpForwardEntry succeeded with dwForwardMetric1=30 and dwForwardType=4 Wed Apr 04 21:36:08 2012 Route addition via IPAPI succeeded [adaptive] Wed Apr 04 21:36:08 2012 Initialization Sequence Completed Wed Apr 04 21:36:08 2012 MANAGEMENT: >STATE:1333568168,CONNECTED,SUCCESS,172.16.100.6,11.22.33.44 Client's route table after connection with OpenVPN: IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.41 281 0.0.0.0 128.0.0.0 172.16.100.1 172.16.100.6 31 94.23.53.45 255.255.255.255 192.168.1.1 192.168.1.41 25 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 128.0.0.0 128.0.0.0 172.16.100.1 172.16.100.6 31 172.16.100.4 255.255.255.252 On-link 172.16.100.6 286 172.16.100.6 255.255.255.255 On-link 172.16.100.6 286 172.16.100.7 255.255.255.255 On-link 172.16.100.6 286 192.168.1.0 255.255.255.0 On-link 192.168.1.41 281 192.168.1.41 255.255.255.255 On-link 192.168.1.41 281 192.168.1.255 255.255.255.255 On-link 192.168.1.41 281 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 192.168.1.41 281 224.0.0.0 240.0.0.0 On-link 172.16.100.6 286 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 192.168.1.41 281 255.255.255.255 255.255.255.255 On-link 172.16.100.6 286 =========================================================================== Persistent Routes: Network Address Netmask Gateway Address Metric 0.0.0.0 0.0.0.0 192.168.1.1 Default =========================================================================== IPv6 Route Table =========================================================================== Active Routes: If Metric Network Destination Gateway 13 58 ::/0 On-link 1 306 ::1/128 On-link 13 58 2001::/32 On-link 13 306 2001:0:5ef5:79fd:3cc3:6b9:ac7c:14db/128 On-link 15 281 fe80::/64 On-link 31 286 fe80::/64 On-link 13 306 fe80::/64 On-link 13 306 fe80::3cc3:6b9:ac7c:14db/128 On-link 31 286 fe80::7d72:9515:7213:35e3/128 On-link 15 281 fe80::9cec:ce3f:89de:a123/128 On-link 1 306 ff00::/8 On-link 13 306 ff00::/8 On-link 15 281 ff00::/8 On-link 31 286 ff00::/8 On-link =========================================================================== Persistent Routes: None

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• fast algorithm to sort very small set

  - by aaa

  hello. This is the problem I ran into long time ago. I thought I may ask your for your ideas. assume I have very small set of numbers (integers), 4 or 8 elements, that need to be sorted, fast. what would be the best approach/algorithm? my approach was to use the max/min functions only. At this point it becomes somewhat hardware dependent , so let us assume Intel 64-bit processor with SSE3 . Thanks

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• Is Updating double operation atomic

  - by Yan Cheng CHEOK

  In Java, updating double and long variable may not be atomic, as double/long are being treated as two separate 32 bits variables. http://java.sun.com/docs/books/jls/second_edition/html/memory.doc.html#28733 In C++, if I am using 32 bit Intel Processor + Microsoft Visual C++ compiler, is updating double (8 byte) operation atomic? I cannot find much specification mention on this behavior. When I say "atomic variable", here is what I mean : Thread A trying to write 1 to variable x. Thread B trying to write 2 to variable x. We shall get value 1 or 2 out from variable x, but not an undefined value.

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• CPU consumption of my process

  - by Abruzzo Forte e Gentile

  Hi all I would like to use Performance Monitor to check the CPU consumption of my process. Right now I am working on a MultiCore machine. If I have a look at my process in TASK MANAGER I see that my process consumes 20% of CPU. If I start performance monitor, I select Process--% Processor Time I see values peaking up and over 100%. Do you know why and how to get the real measure? I also looked at the CPU consumption for all of my 4 cores, but I don't know exactly how to attribute consumption to my process. If you can suggest a link or url about how to read CPU usage I would really appreciate! Thanks a lot! AFG

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• Boost::Thread or fork() : Multithreaded HTTP Proxy

  - by osmano807

  I'm testing boost::thread on a system. It happens that I needed to act as a fork(), because one thread modifies the other variables, even member variables of class I do the project using fork() or is there some alternative still using boost::thread? Basically I run this program in Linux and maybe FreeBSD. It is an http proxy,accept() in main thread, and a function that accepts a class (where there is the file descriptor socket) in a secondary thread that makes the service. Is there a better way to implement a proxy?

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• Cast to generic type in C#

  - by Andrej

  I have a Dictionary to map a certain type to a certain generic object for that type. For example: typeof(LoginMessage) maps to MessageProcessor<LoginMessage> Now the problem is to retrieve this generic object at runtime from the Dictionary. Or to be more specific: To cast the retrieved object to the specific generic type. I need it to work something like this: Type key = message.GetType(); MessageProcessor<key> processor = messageProcessors[key] as MessageProcessor<key>; Hope there is a easy solution to this. Edit: I do not want to use Ifs and switches. Due to performance issues I cannot use reflection of some sort either.

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• Windows Network Programming

  - by bdhar

  I am planning to get some good book for Windows Socket Programming in VC++. I have 2+ years of experience in working with VC++/ATL/COM/MFC; but not in the networking domain. I have been doing some search in Google for "Windows network programming" books. There are few but they have both good and bad comments scattered all over; and I am not able to decide anything. Please recommend some good book with Pros and Cons. The books I found are below. Windows Sockets Network programming Network Programming for Microsoft Windows Thanks.

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• Jmeter Exception response code :000 ,response message:Read timed out,for Java Web service?

  - by vipin k.

  I am testing a java web service(jax-ws),but whenever i am running the test i am getting response code as response message:Read timed out . And at tomcat serevr side i am getting exception : SEVERE: caught throwable ClientAbortException: java.net.SocketException: Connection reset by peer: socket write error at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:358) at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:354) at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:381) at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:370) at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:89) I found out that Read timed out exception may occur because of big size of SOAP response. But i am clue less because same web service i can access form an application.

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• Programatically detect number of physical processors/cores or if hyper-threading is active on Window

  - by HTASSCPP

  I have a multithreaded c++ application that runs on Windows, Mac and a few Linux flavours. To make a long story short: Inorder for it to run at maximum efficiency I have to be able to instantiate a single thread per physical processor/core. Creating more threads than there are physical processors/cores degrades the performance of my program considerably. I can already correctly detect the number of logical processors/cores correctly on all three of these platforms. To be able to detect the number of physical processors/cores correctly I'll have to detect if hyper-treading is supported AND active. My question therefore is if there is a way to detect whether hyperthreading is supported AND ENABLED? If so, how exactly.

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• Which language/framework to use for this desktop internet application?

  - by Karsten

  I'd like to experiment with a new language/framework to work on some desktop tools for myself, which will do tasks related to internet services. I.e. i'd like to to monitor some of my servers for http or icmp response, also parse xml responses. I have experience with php, lua, mysql, and basic knowledge of java and c++. I'm also interested in exploring multithreading for this, background tasks and a responsive gui do need that as i have read. Being a private project, i certainly want to learn something new, but i don't have that much free time. The question for you would be which language and what framework to choose that could help me with this tasks: lightweight + fast gui (windows only would be ok, platform-independent even better) network/socket support, html module would be appreciated htmlview support xml "parsing" support (xpath or something like the phpish DOMDocument class) threading support Free software would be nice, but paying some bucks won't hurt me if it really helps the case.

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• Best CPUs for speeding up compiling times of C++ w/ DistGCC

  - by Jay

  I'm putting together a distributed build farm with DistGCC to speed up our teams compile times and just looking for thoughts on which processors to use in the hosts. Are we going to get a noticeable decrease in time using 8 cores vs. 4-hyperthreaded cores? Big difference in time between i7 and Xeon? etc, etc. Just need advice from people who've put together kick-a build clusters. We've got a majority of the normal things to speed up builds in place (pre-compiled headers, ccache, local gigabit connections between them, tons of ram, etc) so please just give advice on the best processor to use. And money is a factor, but anythings doable if the performance increase is noticeable. Thanks. Jay

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• C++ project type: unicode vs multi-byte; pros and cons

  - by Stefan Valianu

  I'm wondering what the Stack Overflow community thinks when it comes to creating a project (thinking primarily c++ here) with a unicode or a multi-byte character set. Are there pros to going Unicode straight from the start, implying all your strings will be in wide format? Are there performance issues / larger memory requirements because of a standard use of a larger character? Is there an advantage to this method? Do some processor architectures handle wide characters better? Are there any reasons to make your project Unicode if you don't plan on supporting additional languages? What reasons would one have for creating a project with a multi-byte character set? How do all of the factors above collide in a high performance environment (such as a modern video game) ?

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• ASP.NET Web App to compare performance on different hardware?

  - by Guy

  I'm looking for an open source C# ASP.NET Web App that can be loaded onto 2 or more dedicated servers and provide me with metrics on how that server is performing. E.g. Click on a page and the app does a number of in-memory iterations and/or calculations to test processor throughput. Another page would do a bunch of disk access and report on that. I could put one together myself but there might already be something out there with a whole ton of tools in it to do this. I would imagine that I'm not the first one that would want to compare two machines for use as a web server.

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• Microsecond (or one ms) time resolution on an embedded device (Linux Kernel)

  - by ChrisDiRulli

  Hey guys, I have a kernel module I've built that requires at least 1 ms time resolution. I currently use do_gettimeofday() but I'm concerned that this won't work once I move my module to an embedded device. The device has a 180 Mz processor (MIPS) and the default HZ value in the kernel is 100. Thus using jiffies will only give me at best 10 ms resolution. That won't cut it. What I'd like to know is if do_gettimeofday() is based on the timer interrupt (HZ). Can it be guaranteed to provide at least 1 ms of resolution? Thanks!

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• How to pass a string containing both single and double quotes as a parameter to XSLT in PHP?

  - by Boaz

  Hi, I have a simple PHP-based XSLT trasform code that looks like that: $xsl = new XSLTProcessor(); $xsl->registerPHPFunctions(); $xsl->setParameter("","searchterms", $searchterms); $xsl->importStylesheet($xslDoc); echo $xsl->transformToXML($doc); The code passes the variable $searchterms, which contains a string, as a parameter to the XSLT style sheet which in turns uses it as a text: <title>search feed for <xsl:value-of select="$searchterms"/></title> This works fine until you try to pass a string with mixes in it, say: $searchterms = '"some"'." text's quotes are mixed." In that point the XSLT processor screams: Cannot create XPath expression (string contains both quote and double-quotes) What is the correct way to safely pass arbitrary strings as input to XSLT? Note that these strings will be used as a text value in the resulting XML and not as an XPATH paramater. Thanks, Boaz

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• Java TCP keep-alive for a master server

  - by asmo

  Context: Master server (Java, TCP) monitoring a list of hosted games (a different machine for the master server and for each hosted game server). Any user can host a game on his PC. Hosted games can last weeks or months. Need: Knowing when hosted game servers are closed or no longer reachable. Restriction 1: Can't rely on hosted servers' "gone offline update message", since those messages may never arrive (power down, Internet link cut, etc.) Restriction 2: I'm not sure about TCP's built-in keep-alive, since it would mean a 24/7 open socket with each hosted server (correct me if I'm wrong) Any thoughts?

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• Why GPRS modem provides embedded TCP/IP stack

  - by Christian Madsen

  My colleague and I are mining the GPRS MODEM market for a module suitable for use with embedded Linux. During the market scan, we see that several vendors highlight that their MODEMs include an embedded TCP/IP stack. This makes me wonder: when we are using embedded Linux which already contains a TCP/IP stack and connects using PPP, will it make use of the stack included in the GPRS MODEM at all? My current assumption is that the stack is included for use with tiny microcontroller OS that do not supply their own stack. Also some of the MODEMs allow for running small applications IN the MODEM baseband processor which could explain the embedded stack... So: is the TCP/IP stack supplied by the GPRS MODEM superfluous when using it with an HL OS or did I overlook something?

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• Lighttpd not cleanly restarting (address already in use)

  - by NilObject

  When doing a dist-upgrade recently, my lighttpd-1.4.19 install on Ubuntu 8.0.4 has begun failing to restart or reload properly with the /etc/init.d/lighttpd restart command. ~$ sudo /etc/init.d/lighttpd restart * Stopping web server lighttpd ...done. * Starting web server lighttpd 2009-06-13 04:06:36: (network.c.300) can't bind to port: 80 Address already in use ...fail! The same error occurs when I do a reload. The way I get around it is to kill lighttpd and then issue the start command, but it seems like I shouldn't have to do that :) I've looked at my config files, and can't spot any immediate errors. Does anyone have any ideas what can be causing this error? This seems to be the latest version as of writing this question that is available via the apt-get route. My config file is: # Debian lighttpd configuration file # ############ Options you really have to take care of #################### ## modules to load # mod_access, mod_accesslog and mod_alias are loaded by default # all other module should only be loaded if neccesary # - saves some time # - saves memory server.modules = ( "mod_access", "mod_alias", "mod_accesslog", "mod_compress", "mod_fastcgi", "mod_rewrite", "mod_redirect", ) ## a static document-root, for virtual-hosting take look at the ## server.virtual-* options server.document-root = "/var/www/" ## where to send error-messages to server.errorlog = "/var/log/lighttpd/error.log" fastcgi.server = (".php" => (( "bin-path" => "/usr/bin/php5-cgi", "socket" => "/tmp/php.socket" ))) ## files to check for if .../ is requested index-file.names = ( "index.php", "index.html", "index.htm", "default.htm", "index.lighttpd.html" ) ## Use the "Content-Type" extended attribute to obtain mime type if possible # mimetype.use-xattr = "enable" #### accesslog module accesslog.filename = "/var/log/lighttpd/access.log" ## deny access the file-extensions # # ~ is for backupfiles from vi, emacs, joe, ... # .inc is often used for code includes which should in general not be part # of the document-root url.access-deny = ( "~", ".inc" ) ## # which extensions should not be handle via static-file transfer # # .php, .pl, .fcgi are most often handled by mod_fastcgi or mod_cgi static-file.exclude-extensions = ( ".php", ".pl", ".fcgi" ) mimetype.assign = ( ".pdf" => "application/pdf", ".sig" => "application/pgp-signature", ".spl" => "application/futuresplash", ".class" => "application/octet-stream", ".ps" => "application/postscript", ".torrent" => "application/x-bittorrent", ".dvi" => "application/x-dvi", ".gz" => "application/x-gzip", ".pac" => "application/x-ns-proxy-autoconfig", ".swf" => "application/x-shockwave-flash", ".tar.gz" => "application/x-tgz", ".tgz" => "application/x-tgz", ".tar" => "application/x-tar", ".zip" => "application/zip", ".mp3" => "audio/mpeg", ".m3u" => "audio/x-mpegurl", ".wma" => "audio/x-ms-wma", ".wax" => "audio/x-ms-wax", ".ogg" => "audio/x-wav", ".wav" => "audio/x-wav", ".gif" => "image/gif", ".jpg" => "image/jpeg", ".jpeg" => "image/jpeg", ".png" => "image/png", ".xbm" => "image/x-xbitmap", ".xpm" => "image/x-xpixmap", ".xwd" => "image/x-xwindowdump", ".css" => "text/css", ".html" => "text/html", ".htm" => "text/html", ".js" => "text/javascript", ".asc" => "text/plain", ".c" => "text/plain", ".conf" => "text/plain", ".text" => "text/plain", ".txt" => "text/plain", ".dtd" => "text/xml", ".xml" => "text/xml", ".rss" => "application/rss+xml", ".mpeg" => "video/mpeg", ".mpg" => "video/mpeg", ".mov" => "video/quicktime", ".qt" => "video/quicktime", ".avi" => "video/x-msvideo", ".asf" => "video/x-ms-asf", ".asx" => "video/x-ms-asf", ".wmv" => "video/x-ms-wmv", ".bz2" => "application/x-bzip", ".tbz" => "application/x-bzip-compressed-tar", ".tar.bz2" => "application/x-bzip-compressed-tar" ) include_shell "/usr/share/lighttpd/include-conf-enabled.pl" My /etc/init.d/lighttpd script is (untouched from installation): #!/bin/sh ### BEGIN INIT INFO # Provides: lighttpd # Required-Start: networking # Required-Stop: networking # Default-Start: 2 3 4 5 # Default-Stop: 0 1 6 # Short-Description: Start the lighttpd web server. ### END INIT INFO PATH=/sbin:/bin:/usr/sbin:/usr/bin DAEMON=/usr/sbin/lighttpd NAME=lighttpd DESC="web server" PIDFILE=/var/run/$NAME.pid SCRIPTNAME=/etc/init.d/$NAME ENV="env -i LANG=C PATH=/usr/local/bin:/usr/bin:/bin" SSD="/sbin/start-stop-daemon" DAEMON_OPTS="-f /etc/lighttpd/lighttpd.conf" test -x $DAEMON || exit 0 set -e # be sure there is a /var/run/lighttpd, even with tmpfs mkdir -p /var/run/lighttpd > /dev/null 2> /dev/null chown www-data:www-data /var/run/lighttpd chmod 0750 /var/run/lighttpd . /lib/lsb/init-functions case "$1" in start) log_daemon_msg "Starting $DESC" $NAME if ! $ENV $SSD --start --quiet\ --pidfile $PIDFILE --exec $DAEMON -- $DAEMON_OPTS ; then log_end_msg 1 else log_end_msg 0 fi ;; stop) log_daemon_msg "Stopping $DESC" $NAME if $SSD --quiet --stop --oknodo --retry 30\ --pidfile $PIDFILE --exec $DAEMON; then rm -f $PIDFILE log_end_msg 0 else log_end_msg 1 fi ;; reload) log_daemon_msg "Reloading $DESC configuration" $NAME if $SSD --stop --signal 2 --oknodo --retry 30\ --quiet --pidfile $PIDFILE --exec $DAEMON; then if $ENV $SSD --start --quiet \ --pidfile $PIDFILE --exec $DAEMON -- $DAEMON_OPTS ; then log_end_msg 0 else log_end_msg 1 fi else log_end_msg 1 fi ;; restart|force-reload) $0 stop [ -r $PIDFILE ] && while pidof lighttpd |\ grep -q `cat $PIDFILE 2>/dev/null` 2>/dev/null ; do sleep 1; done $0 start ;; *) echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2 exit 1 ;; esac exit 0

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• IRQ problem with 2.6.32/2.6.39 kernel on Debian Squeeze x86_64

  - by MasterM

  I recently assembled a new computer so that all hardware is pretty new. Since then I've been experiencing some problem with IRQs when running Debian 6.0. On random occasions, usually after an hour or so of running I hear a beep and this shows up in dmesg: [ 3537.762795] irq 16: nobody cared (try booting with the "irqpoll" option) [ 3537.762797] Pid: 0, comm: swapper Tainted: P W O 2.6.39-2-amd64 #1 [ 3537.762798] Call Trace: [ 3537.762799] <IRQ> [<ffffffff810924d4>] ? __report_bad_irq+0x3a/0xa2 [ 3537.762803] [<ffffffff810926a4>] ? note_interrupt+0x168/0x1da [ 3537.762805] [<ffffffff81090dd4>] ? handle_irq_event_percpu+0x171/0x18f [ 3537.762807] [<ffffffff8100e0e2>] ? read_tsc+0x5/0x16 [ 3537.762809] [<ffffffff8106b8a2>] ? update_ts_time_stats+0x32/0x6b [ 3537.762810] [<ffffffff81090e26>] ? handle_irq_event+0x34/0x52 [ 3537.762812] [<ffffffff81063fb7>] ? sched_clock_idle_wakeup_event+0x12/0x1c [ 3537.762813] [<ffffffff81092df2>] ? handle_fasteoi_irq+0x82/0xa4 [ 3537.762815] [<ffffffff8100aadb>] ? handle_irq+0x1a/0x23 [ 3537.762816] [<ffffffff8100a384>] ? do_IRQ+0x45/0xaa [ 3537.762818] [<ffffffff81332c93>] ? common_interrupt+0x13/0x13 [ 3537.762818] <EOI> [<ffffffff81332c8e>] ? common_interrupt+0xe/0x13 [ 3537.762821] [<ffffffff81026800>] ? native_safe_halt+0x2/0x3 [ 3537.762829] [<ffffffffa016ed58>] ? acpi_idle_do_entry+0x39/0x62 [processor] [ 3537.762831] [<ffffffffa016edde>] ? acpi_idle_enter_c1+0x5d/0xad [processor] [ 3537.762834] [<ffffffff81261033>] ? cpuidle_idle_call+0x11f/0x1cc [ 3537.762835] [<ffffffff81008dd2>] ? cpu_idle+0xab/0xe1 [ 3537.762837] [<ffffffff8169fc60>] ? start_kernel+0x3e0/0x3eb [ 3537.762838] [<ffffffff8169f3c8>] ? x86_64_start_kernel+0x102/0x10f [ 3537.762839] handlers: [ 3537.762840] [<ffffffffa0358d5a>] (rtl8169_interrupt+0x0/0x2d7 [r8169]) [ 3537.762842] [<ffffffffa08ff2ca>] (nv_kern_isr+0x0/0x54 [nvidia]) [ 3537.762902] Disabling IRQ #16 After that Xorg either hogs on CPU or is unstable (up to hanging the system completely). When I restart Xorg everything is fine again and the problem doesn't occur until next reboot. I tried to upgrade the kernel from stock 2.6.32 to 2.6.39 from unstable repository but that didn't help. Booting with irqpoll option only seems to prolong the initial time period after which the problem occurs. I'm using latest NVIDIA drivers and Realtek firmware from firmware-realtek package. I have two GTX 560Ti that run in SLI. Disabling SLI or taking out one card completely doesn't solve the problem either. Output of uname -a is: Linux whitestar 2.6.39-2-amd64 #1 SMP Wed Jun 8 11:01:04 UTC 2011 x86_64 GNU/Linux Output of lspci is: 00:00.0 Host bridge: Intel Corporation Sandy Bridge DRAM Controller (rev 09) 00:01.0 PCI bridge: Intel Corporation Sandy Bridge PCI Express Root Port (rev 09) 00:01.1 PCI bridge: Intel Corporation Sandy Bridge PCI Express Root Port (rev 09) 00:16.0 Communication controller: Intel Corporation Cougar Point HECI Controller #1 (rev 04) 00:19.0 Ethernet controller: Intel Corporation 82579V Gigabit Network Connection (rev 05) 00:1a.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #2 (rev 05) 00:1b.0 Audio device: Intel Corporation Cougar Point High Definition Audio Controller (rev 05) 00:1c.0 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 1 (rev b5) 00:1c.1 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 2 (rev b5) 00:1c.2 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 3 (rev b5) 00:1c.4 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 5 (rev b5) 00:1c.6 PCI bridge: Intel Corporation 82801 PCI Bridge (rev b5) 00:1d.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #1 (rev 05) 00:1f.0 ISA bridge: Intel Corporation Cougar Point LPC Controller (rev 05) 00:1f.2 SATA controller: Intel Corporation Cougar Point 6 port SATA AHCI Controller (rev 05) 00:1f.3 SMBus: Intel Corporation Cougar Point SMBus Controller (rev 05) 01:00.0 VGA compatible controller: nVidia Corporation Device 1200 (rev a1) 01:00.1 Audio device: nVidia Corporation Device 0e0c (rev a1) 02:00.0 VGA compatible controller: nVidia Corporation Device 1200 (rev a1) 02:00.1 Audio device: nVidia Corporation Device 0e0c (rev a1) 04:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04) 06:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04) 07:00.0 PCI bridge: Device 1b21:1080 (rev 01) 08:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8110SC/8169SC Gigabit Ethernet (rev 10) 08:03.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6306/7/8 [Fire II(M)] IEEE 1394 OHCI Controller (rev c0) Contents of /proc/interrupts: CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 0: 77 0 0 0 0 0 0 0 IO-APIC-edge timer 1: 2 0 0 0 0 0 0 0 IO-APIC-edge i8042 8: 1 0 0 0 0 0 0 0 IO-APIC-edge rtc0 9: 0 0 0 0 0 0 0 0 IO-APIC-fasteoi acpi 12: 4 0 0 0 0 0 0 0 IO-APIC-edge i8042 16: 699083 0 0 0 0 0 0 0 IO-APIC-fasteoi nvidia, eth0 17: 87810 0 0 0 0 0 0 0 IO-APIC-fasteoi firewire_ohci, hda_intel, nvidia 18: 242 0 0 0 0 0 0 0 IO-APIC-fasteoi hda_intel 23: 85925 0 0 0 0 0 0 0 IO-APIC-fasteoi ehci_hcd:usb5, ehci_hcd:usb6 40: 0 0 0 0 0 0 0 0 PCI-MSI-edge PCIe PME 41: 0 0 0 0 0 0 0 0 PCI-MSI-edge PCIe PME 42: 0 0 0 0 0 0 0 0 PCI-MSI-edge PCIe PME 43: 0 0 0 0 0 0 0 0 PCI-MSI-edge PCIe PME 44: 0 0 0 0 0 0 0 0 PCI-MSI-edge PCIe PME 45: 0 0 0 0 0 0 0 0 PCI-MSI-edge PCIe PME 46: 79853 0 0 0 0 0 0 0 PCI-MSI-edge ahci 48: 1 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 49: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 50: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 51: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 52: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 53: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 54: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 55: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 56: 1 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 57: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 58: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 59: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 60: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 61: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 62: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 63: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 64: 173506 0 0 0 0 0 0 0 PCI-MSI-edge hda_intel NMI: 482 89 25 13 277 24 11 10 Non-maskable interrupts LOC: 783857 194752 114133 70577 372438 179065 117179 162016 Local timer interrupts SPU: 0 0 0 0 0 0 0 0 Spurious interrupts PMI: 482 89 25 13 277 24 11 10 Performance monitoring interrupts IWI: 0 0 0 0 0 0 0 0 IRQ work interrupts RES: 131917 46750 7432 3291 150003 9576 3435 3067 Rescheduling interrupts CAL: 2759 6563 7150 6997 5387 7140 7269 6678 Function call interrupts TLB: 4396 2038 1336 492 5434 1896 1121 606 TLB shootdowns TRM: 0 0 0 0 0 0 0 0 Thermal event interrupts THR: 0 0 0 0 0 0 0 0 Threshold APIC interrupts MCE: 0 0 0 0 0 0 0 0 Machine check exceptions MCP: 37 37 37 37 37 37 37 37 Machine check polls ERR: 0 MIS: 0 Last but not least, right after boot-up those lines are usually present in dmesg: [ 18.367094] hda-intel: IRQ timing workaround is activated for card #1. Suggest a bigger bdl_pos_adj. [ 18.458859] hda-intel: IRQ timing workaround is activated for card #2. Suggest a bigger bdl_pos_adj. I'm not sure if it's related or a symptom of a bigger problem so I'm posting it just in case. I don't really know what other information might be of relevance here. Don't hesitate to ask for more in the comments.

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