Questions tagged [sockets]

a data structure that provides access to inter-process communication. For the past 40 years, this basically means network communication.

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132
votes
6answers
77k views

Difference between a socket and a port

Could someone please explain quite clearly the difference between a port and a socket. I know that a port serves as a door into the network for an application process and that the application process ...
21
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3answers
11k views

Simple explanation of the Unix sockets

I can search and I've already looked at the wikipedia entry and in some other places, but even though I have some programming experience, I don't really grasp the concept. Can you treat me like a 10 ...
17
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2answers
6k views

Why can't sockets be used to identify individuals instead of cookies?

Another question was asked regarding the use of IP addresses to identify individual clients. I think I understand why an IP address is insufficient. But what about the socket, which has more ...
17
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3answers
24k views

Difference between networking programming and socket programming

Are there any major differences when we talk about "socket programming" compared to "network programming"? Are there some topics that cover "network programming" but not "socket programming"?
15
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1answer
4k views

How do sockets work over wireless connections?

I've only worked on client side(specifically, mobile) applications using Android, where all networking is handled at the HTTP layer using framework provided components like HttpUrlConnection. But ...
14
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4answers
9k views

How to handle Real Time Data from a database perspective?

I have an idea in mind, but it still confuses me the database area. Imagine that I want to show real time data, and using one of the latest browser technologies (web sockets - even using older ...
14
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1answer
1k views

What did network programs use to communicate before sockets was invented (around 1983?)

Sockets were invented in Berkeley around 1983, but how did networked computer programs work before this? These days, pretty much everything uses sockets, so it's hard for me to imagine how else ...
11
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3answers
7k views

Is there an alternative to HTML Web Sockets, now that Firefox 4 has disabled them?

I've been checking out some of the latest multiplayer engines in HTML all supporting multi-user games (Very nice) - I believe all these engines use Web Sockets for communication. That’s why we’ve ...
9
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2answers
10k views

What are the pros and cons of Inter process communication done via sockets vs shared memory?

I understand that two of the many more options for inter process communication can be : Shared memory Sockets Actually I saw these two options being exposed by Intellij Idea for debugging a Java ...
8
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1answer
2k views

Does it ever make sense to read from and/or write to a bound, listening socket?

I'm experimenting a little with creating a socket server, in PHP. In doing so I'm trying to abstract away the kinds of sockets I think I'll be needing, that I've tentitively named: ListenSocket — the ...
7
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5answers
29k views

Serializing Data Structures in C [closed]

I've recently read three separate books on algorithms and data structures, tcp/ip socket programming, and programming with memory. The book about memory briefly discussed the topic of serializing data ...
7
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7answers
14k views

UDP order of packets with direct connection

If i have two systems (A and B) running on LAN(INTRANET) which are directly connected. There are no routers in the middle. In this case, if system A sends a few UDP packets every few milliseconds to ...
7
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5answers
14k views

Is there a problem holding large numbers of open socket connections for lengthy periods of time?

The application we have in mind is a relay server. The aim is to accept large numbers of incoming socket connections (at least thousands) that will stay open for lengthy periods (hours or maybe days). ...
7
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2answers
4k views

How to match responses from a server with their corresponding requests?

There is a server that responds to requests on a socket. The client has functions to emit requests and functions to handle responses from the server. The problem is that the request sending function ...
7
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1answer
2k views

Solutions for implementing a full-duplex game server?

I am designing a game server which would be used for Android terminals. I've been searching for products or frameworks to use for two-way socket communication but haven't found anything worth ...
7
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5answers
2k views

How do I balance 100 clients checking the same database table in a loop?

What I have This is a prototype. I have a pool of 100 clients connected to the server via websockets reporting things and awaiting for commands. The server polls the commands database table of type ...
6
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0answers
789 views

Zeromq bidirectional asynchronous transmission?

I have a system which consists of two applications. Currently, two applications communicate using multiple zeromq publish/subscribe sockets generated for each specific type of transmission. Sockets ...
5
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1answer
2k views

How much overhead is there in persistent connections?

Ok so I'm musing over a little side project I want to start. Essentially its a multi-session web based FTP client. Multi-session in that you can log into several FTP servers at the same time and ...
5
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2answers
939 views

How to handle thousands of messages to C socket?

I currently have a setup looking like this: __________________ _________ ________ ___________ | Front end server |----| Varnish |----| NodeJS |----| C-service | ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾ ...
4
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1answer
1k views

Why is it a bad design to designate one thread to send data on a socket and the other to receive data?

I posted a question on SO whether two threads can simultaneously execute a send() and a recv() on the same socket. I was told that while they could, implementing this was an example of a very poor ...
4
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1answer
7k views

Protocol for closing a socket connection

I'm rolling my own application protocol on top of TCP. I'm using Linux and C. I'm wondering whether there is an advisable sequence to closing a socket connection. The client will always initiate ...
4
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1answer
20k views

Non Blocking Sockets vs Blocking sockets - UDP - C&linux

When to use blocking sockets over non blocking sockets on UDP? Question 1:What's is recommended for the following scenario ? Multiple clients send data over multiple UDP sockets, i.e. say client1 ...
4
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1answer
360 views

Sockets intricacies in TCP and UDP

I am quite familiar with TCP and UDP. I understand the process by which TCP establishes connections and other theoretical facts about TCP but when reading up about TCP hole punching for NAT ...
3
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4answers
628 views

Does a full duplex communication object conflict with single responsibility?

I'm writing a Websocket implementation in Java, and I've set it up so that it basically just wraps an InputStream and OutputStream, and has public methods for both sending and receiving. While input ...
3
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1answer
1k views

Are there security implications to using dynamically-assigned TCP port numbers?

I'm getting pushback from operations for having a server process listen on a dynamically-assigned port number (i.e. it binds a socket to a port number of 0, triggering a dynamic assignment by the OS, ...
3
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1answer
889 views

Application protocols and state machines: designing a complicated server

I'm designing and prototyping a server that has the following characteristics: during the daemon's initialization it spawns nine "manager" servers, each of which solves one part of the overall ...
3
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2answers
2k views

Socket on a webserver

So what I know about socket is that a socket is an end point of a connection for a process, hence 1 socket on a host binds to an IP and a unique port number for each connection. But a webserver (by ...
3
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3answers
5k views

Proper way to send custom data structures by sockets

I'm wondering what is the proper way to send structures as char array by sockets. At this moment I have somethig like below but it isn't good solution because it causes undefined behavoiur. Is it ...
3
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1answer
1k views

Scaling tcp/ip socket server applications

I have been trying to understand how one would scale an application utilizing tcp/ip sockets for client server communication. For example in the simple diagram below: +------------+ | ...
3
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1answer
281 views

Is TCP still considered siginificant overhead compared to UDP? [closed]

I'm working on a distributed application for a graduate class I'm taking. There has been much discussion around implementing a way to maintain peer connection health statuses. Think Gossip. One of the ...
3
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1answer
110 views

Is web sockets the best solution for my problem?

I have created a Slackbot that integrates with Submittable.com. For example, I can trigger a response that displays all current submissions in Slack. I now need my Slackbot to post in Slack whenever ...
3
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2answers
5k views

Realtime (almost) bidrectional communication in Java

I will explain the context of the problem first. For a University project I'm going to implement an Android application. The Android application (and others) will be able to send data to a remote ...
3
votes
2answers
200 views

How to find an error in a tcp server application for which there is no source code

I have a c++/cli tcp client application sending a data in a specific format like L,20100930033425093,-5.929958,13.164021 to a main application on port 9000.The main application is actually done by the ...
3
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1answer
2k views

Is ZeroMQ a good choice to make a Python app and a C# managed assembly work together?

I have a task that involves talking to a .NET-based API (namely AutoCAD) to retrieve data, send commands, and react to events. I want to separate the API operations and the proper program logic (...
3
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1answer
181 views

(C++) Ideal design pattern for associating requests/responses on socket?

I'm working on my first big C++ project and while I understand the language I'm trying to learn elegant design patterns using it. I have some low-level networking over a UDP sockets API where each ...
3
votes
1answer
129 views

How to handle a client app that connects to a TCP server and sends/receives text data bidirectionally?

I've got a conceptual question (which is probably better posted here than on StackOverflow?). I want to develop a client application that maintains a persistent connection to a server, and exchanges ...
3
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1answer
2k views

Design pattern for socket.io and Express

I have a Node.js Express RESTful HTTP server I will call server A and an Express socket.io server I will call server B. Server A responds to all HTTP requests by clients and server B listens to the ...
3
votes
1answer
324 views

Design approach to outsourcing a socket in an own thread

I want to extend an existing server written in C++ to be able to communicate with an other server over websockets (e.g. logging or user authorisation purposes). All examples (including the very well ...
3
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0answers
460 views

Design a Windows Service with self-hosted ASP.NET Core Web Services and UPD port listeners

I'm designing a software platform in automation that is responsible of many different tasks like: Core functions Driver interface for machines UDP listener for machine messages from PLC UDP listener ...
3
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2answers
576 views

Is briefly closing a listen socket then re-opening it a horrible idea?

I'm writing an application on x86_64 CentOS 7 that functions as a server, managing potentially thousands of devices. Because my application doesn't do so well when running through the connection ...
2
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3answers
130 views

How do you resolve a byte[] into a class instance in a way that doesn't couple the serialization/deserialization contexts together

Consider that you've got a POJO that you intend to serialize and send through a socket. You can use whatever serialization strategy you wish (JSON, XML, protobuf, ..., etc) to serialize the actual ...
2
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2answers
135 views

How do network loops actually “catch” connections reliably?

Take for example, a simple web server in C's loop: while(1) { /*accept connection that comes into server_socket and assign its handle to client_socket*/ client_socket = accept(...
2
votes
2answers
530 views

Chat part of application - using UDP or TCP?

I'm trying to build a section of my app where two users can message each other. I've read about TCP and UDP and it seems like TCP is more suited due to ordered packet delivery. However, TCP requires a ...
2
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2answers
1k views

Should I lock a list of objects while a socket is receiving messages?

I have a scenario where I will be receiving messages through a socket connection. I also need to keep a list of 100 messages (such as List) and periodically toss out old messages from the list when a ...
2
votes
1answer
605 views

What to choose API based server or Socket based server for data driven application

I am working on a project which has a Desktop Application for MAC/COCOA, a native application for iPhone another native application in iPad. All the application do almost same thing. The applications ...
2
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1answer
6k views

bind() call in socket programming

I am reading about socket programming and got to know that ip is assigned to socket with bind() call before connection to server.Is my thinking of binding address means to bind any ip address correct.
2
votes
1answer
934 views

Is there a cross-platform way to open a TCP connection, send a HTTP post request and keep the connection open?

I'm searching for a way to open a TCP connection, send a HTTP post request and keep the connection open. It would be great if I can achieve this without administrator/root rights, from a command-line ...
2
votes
1answer
825 views

Designing a program that runs scripts on multiple computers (Java)

I've been trying to design a program in Java (because I might need to create an app that does the controlling part) with GUI that can run scripts on a few local computers. It should do the following: ...
2
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1answer
1k views

Handling large amounts of sockets

I am working on a project in which we have a desktop application that should be able to receive commands from a web application. To solve this issue, using sockets seems like a good approach (instead ...
2
votes
2answers
2k views

How to plan a client/server app networking architecture to cope with multiple unrelated exchanges of data?

I'm coding a server/client application pair in Java, as I learn about it. I have basic functionality of sending a message to the server and parsing it but in thinking about the big picture of their ...