Python socket programming
How can I know if a node that is being accessed using TCP socket is alive or if the connection was interrupted and other errors? Thanks! ...
sockets
ZeroMQ design decisions
In a REQ/REP socket, if the socket send a request to a dead (disconnected) node the message isn't delivered and stays in a message queue occupying memory. How can one clean these undelivered messages (let's say, messages that are in the queue for more than 1 minute)? Thanks! ...
Windows IOCP - any advantage for single-socket application?
As I understand IOCP under Windows Server 2003/2008 and C++ programming, they are more-or-less the highest performance way to service either multiple sockets, instead of select, or to tie together multiple threads to service those requests. If my program has but a single socket however, and given other constraints will generally read on...
Telnet performance in windows xp and Linux
hi, I has a Library impelmented based on Python's telnetlib. And recently, i noticed that the performance in windows xp and Linux is so different. below script, i design three operations, "get units", "just press enter", "get units with options" "get units" has long string return, "get units with options" return shorter string, and "j...
Why recv() in winsock client cannot get any data once httpRetransmition happens?
Hi guys, I am trying to record the time between 'http request' package and 'http response' package. I write an socket client using winsock. The code is below if (send(sock, request.c_str(), request.length(), 0) != request.length()) die_with_error("send() sent a different number of bytes than expected"); //...
Socket.IO / Node.JS / Rails 3 / IE
This is a bit complicated but here goes. I have a Rails app that has a small JS widget that gets updated on some backend processing stuff. The Rails app queues up a job in Redis (via Kthxbye) which gets processed and then once completed, fires off a redis publish message. This channel is being watched by a Node.JS server which is respon...
Run a program on a specific port of my machine.
I need to run a setup on my windows machine with 1 master and 2 workers on the same machine. I have setup the master to run on port 1111 and workers to run on 2222 & 2223. How can i access these ports to run my programs? I dont want to install VmWare or any virtual desktop. I want to know how can I run a program on a specific port of my...
How To Display Characters Received Via A Socket?
I have a very simple Ruby program that acts as an "echo server". When you connect to it via telnet any text you type is echoed back. That part is working. If I add a 'putc' statement to also print each received character on the console running the program only the very first character displayed is printed. After that it continues to echo...
why doesn't my client read correctly the outputStream sent by the Server?
Hi guys. It's a simple client-server where Server using a BufferedWriter object would send to the Client receiving in the object BufferedReader. When I use OutputStream and PrintWriter for the Server and InputStream and Scanner for the Client it works well. What happens is that the client in Buffered way reads -1 if I'm sending an i...
Is Spring's ThreadPoolTaskExecutor blocking something?
We are using the ThreadPoolTaskExecutor within Spring (inside of Tomcat) to launch a concurrent server which listens on a port (3001). Our code looks a bit like: .... ServerSocket listener = new ServerSocket(port); Socket server; while (true) { PollingTask pollingTask; server = ...
ENOENT while creating a UNIX socket in Ruby
I'm trying to create a socket in Ruby using require "socket" w = UNIXSocket.new("socket") and I keep running into No such file or directory - socket (Errno::ENOENT) This looks completely backwards to me, because new() is supposed to create that missing file. What am I missing? ...
how to do non blocking accept() in Python?
Hello I cannot use threads thus I want to write a server program that can be interrupted after a while: d = show_non_modal_dialog("serving clients") s = socket(...) s.bind(...) s.listen() while (!user_pressed_cancel()) { s.accept() # timed accept for like 1 second if timed_out: continue serve_client close_client_sock } hid...
Query regarding syntax used in a header file for socket programming
This is the piece of the code I copied from one of the header file for socket programming. /* Structure describing an Internet socket address. */ struct sockaddr_in { __SOCKADDR_COMMON (sin_); in_port_t sin_port; /* Port number. */ struct in_addr sin_addr; /* Internet address. */ /* Pad t...
c# Socket not timing out
I have the following c# code to query whois servers, occasionally I will hit a server and the socket will never time out the Receive (unfortunately if I hit the same server again all of a sudden the problem goes away). I have set the ReceiveTimeout value though, anyone know what is going wrong here? string whoisServer = "whois.moniker.c...
Explanation of piece of code used in header files for socket programming.
Can anybody explain me this piece of code? /* Pad to size of `struct sockaddr'. */ unsigned char sin_zero[sizeof (struct sockaddr) - __SOCKADDR_COMMON_SIZE - sizeof (in_port_t) - sizeof (struct in_addr)]; here sin_zero is a char array but what is remaining part? It ...
Simple socket program in Ruby
I want to write a simple server socket in Ruby, which, when a client connects to it, prints a message and closes the client connection. I came up with: require 'socket' server = TCPServer.open('localhost',8800) loop { client = server.accept Thread.start do s = client s.puts "Closing the connection. Bye...
TCP server client issue
First i am n00b in socket programming. So i decided to write simple data over lan tcp server My server code that handles incomming data is private void HandleClientComm(object client) { TcpClient tcpClient = (TcpClient)client; NetworkStream clientStream = tcpClient.GetStream(); clientStream.ReadTimeout = 10; int si...
What do I need to know to write a client server socket program in Java using Caesar Cipher authentication?
I have an assignment called "Write a client server socket program in Java in which server will authenticate client using authentication algorithm." How do I get started? Which are the prerequisites of knowledge of computer security and socket programming to implement this? Any links to good tutorials? EDIT: Using Caesar Cipher ...
If you send data over a socket in one call to send(), will it be received in one call to receive()?
I've seen several uses of sockets where programmers send a command or some information over a TCP/IP socket, and expect it to be received in one call on the receiving side. For eg, transmitting mySocket.Send("SomeSpecificCommand") They assume the receive side will receive all the data in one call. For eg: Dim data(255) As Byte D...
C#.net sockets upload rate
I have a class that uses sockets to send and receive data asynchronously over the network: class Client { private Socket mSocket; /* ... */ public void SendPacket(byte[] data) { mSocket.BeginSend(data, 0, data.Length, SocketFlags.None, OnSent, null); } private void OnSent(IAsyncResult ar) { ...