App V Socket Read Error Handle
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sent. Sorry There was an error emailing this page. Comments By David Reilly JavaWorld | Sep 1, 1999 1:00 AM PT RELATED TOPICS Core Java Comments Many programmers dread the thought of handling network timeouts. A common fear is that a simple, single-threaded network client without timeout support will balloon into a complex multithreaded nightmare, with separate threads needed to detect network timeouts, and some form of notification process at work between the blocked thread and the main application. While this is one option for developers, it is not the only one. Dealing with network timeouts need not be a difficult task, and in many cases you can completely avoid writing code for additional threads.When working with network connections, or any type of I/O device, there are two classifications of operations:Blocking operations: Read or write stalls, operation waits until I/O device is readyNonblocking operations: Read or write attempt is made, operation aborts if I/O device is not readyJava networking is, by default, a form of blocking I/O. Thus, when a Java networking application reads from a socket connection, it will generally wait indefinitely if there is no immediate response. If no data is availab
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Java Socket Connect Timeout
them; it only takes a minute: Sign up Handling POSIX socket read() errors up vote 1 down vote favorite Currently I am implementing a simple client-server program with just the basic functionalities of read/write. However I noticed that if http://www.javaworld.com/javaworld/jw-09-1999/jw-09-timeout.html for example my server calls a write() to reply my client, and if my client does not have a corresponding read() function, my server program will just hang there. Currently I am thinking of using a simple timer to define a timeout count, and then to disconnect the client after a certain count, but I am wondering if there is a more elegant/or standard way of handling such errors? c++ sockets error-handling client share|improve this question edited Jun 25 http://stackoverflow.com/questions/11188221/handling-posix-socket-read-errors '12 at 12:20 Sam Miller 18.1k34373 asked Jun 25 '12 at 11:10 user1450272 1112 What errors? The only error here is that the client isn't reading the messages being sent. That's an application protocol error, a program design error, not something you should be trying to bandaid over at runtime. –EJP Jun 26 '12 at 1:32 add a comment| 2 Answers 2 active oldest votes up vote 3 down vote There are two general approaches to prevent server blocking and to handle multiple clients by a single server instance: use POSIX threads to handle each client's connection. If one thread blocks because of erroneous client, other threads will still continue to run. If the remote client has just disappeared (crashed, network down, etc.), then sooner or later the TCP stack will signal a timeout and the blocked write operation will fail with error. use non-blocking I/O together with a polling mechanism, e.g. select(2) or poll(2). It is quite harder to program using polling calls though. Network sockets are made non-blocking using fcntl(2) and in cases where a normal write(2) or read(2) on the socket would block an EAGAIN error is returned instead. You can use select(2) or poll(2) to wait for something to happen on the socket with an adjustable timeout period. For example, waiting for the socket to become writable, means that you will be notified when there is enough socket sen
Support Search GitHub This repository Watch 278 Star 6,656 Fork 937 NodeRedis/node_redis Code Issues 31 Pull requests 12 Projects 0 Wiki Pulse Graphs https://github.com/NodeRedis/node_redis redis client for node http://redis.js.org/ 1,135 commits 31 branches 66 releases 108 contributors MIT JavaScript 100.0% JavaScript Clone or download Clone with HTTPS Use Git or checkout with SVN using https://docs.python.org/3/howto/sockets.html the web URL. Open in Desktop Download ZIP Find file Branch: master Switch branches/tags Branches Tags fix-windows-spawn generated-commands-test gh-pages greenkeeper-bluebird-3.4.3 greenkeeper-bluebird-3.4.5 greenkeeper-coveralls-2.11.13 greenkeeper-eslint-2.13.0 greenkeeper-eslint-2.13.1 greenkeeper-eslint-3.0.0 greenkeeper-eslint-3.0.1 greenkeeper-eslint-3.1.0 greenkeeper-eslint-3.1.1 greenkeeper-eslint-3.2.0 greenkeeper-eslint-3.2.1 greenkeeper-eslint-3.2.2 socket read greenkeeper-eslint-3.3.0 greenkeeper-eslint-3.3.1 greenkeeper-eslint-3.4.0 greenkeeper-eslint-3.5.0 greenkeeper-eslint-3.6.0 greenkeeper-eslint-3.6.1 greenkeeper-eslint-3.7.0 greenkeeper-mocha-3.0.0 greenkeeper-mocha-3.0.1 greenkeeper-mocha-3.0.2 greenkeeper-mocha-3.1.0 greenkeeper-update-all internal master skip uncork Nothing to show v.2.6.2 v.2.6.1 v.2.6.0 v.2.6.0-2 v.2.6.0-1 v.2.6.0-0 v.2.5.3 v.2.5.2 v.2.5.1 v.2.5.0 v.2.4.2 v.2.4.1 v.2.4.0 v.2.3.1 v.2.3.0 v.2.2.5 v.2.2.4 v.2.2.3 v.2.2.2 v.2.2.0 v.2.1.0 v.2.0.1 v.2.0.0 v1.0.0 v0.12.1 v0.12.0 v0.11.0 v0.10.3 v0.10.2 v0.10.1 v0.10.0 v0.9.2 v0.9.1 v0.9.0 v0.8.6 v0.8.5 v0.8.4 v0.8.3 v0.8.1 v0.8.0 v0.7.2 v0.7.1 socket read error v0.7.0 v0.6.7 v0.6.5 v0.6.2 v0.6.1 v0.6.0 v0.5.11 v0.5.10 v0.5.9 v0.5.8 v0.5.6 v0.5.5 v0.5.4 v0.5.3 v0.5.2 v0.5.1 v0.5.0 v0.4.1 v0.4.0 v0.3.9 v0.3.7 v0.3.6 v0.3.5 2.5.0-1 Nothing to show New pull request Latest commit d3fedc6 Sep 16, 2016 greenkeeperio-bot committed with bcoe chore(package): update nyc to version 8.3.0 (#1143) … https://greenkeeper.io/ Permalink Failed to load latest commit information. .github Explicitly ask for the platform in the issue template Apr 22, 2016 benchmarks Update redis-parser to v.2.0.0 May 28, 2016 examples Replace jshint with eslint and add lots of rules Mar 26, 2016 lib Fire the individual original callbacks when using transactions Jun 16, 2016 test Make test idempotent Jun 16, 2016 .eslintignore Replace jshint with eslint and add lots of rules Mar 26, 2016 .eslintrc Replace jshint with eslint and add lots of rules Mar 26, 2016 .gitignore Explicitly remove a undefined callback from any multi command Dec 30, 2015 .npmignore Update npm ignore file Mar 7, 2016 .travis.yml Support Node.js 6 May 28, 2016 LICENSE Update license year Mar 7, 2016 README.md Noting in docs that retry_max_delay and connect_timeout are
misunderstood technologies around. This is a 10,000 foot overview of sockets. It's not really a tutorial - you'll still have work to do in getting things operational. It doesn't cover the fine points (and there are a lot of them), but I hope it will give you enough background to begin using them decently. Sockets¶ I'm only going to talk about INET (i.e. IPv4) sockets, but they account for at least 99% of the sockets in use. And I'll only talk about STREAM (i.e. TCP) sockets - unless you really know what you're doing (in which case this HOWTO isn't for you!), you'll get better behavior and performance from a STREAM socket than anything else. I will try to clear up the mystery of what a socket is, as well as some hints on how to work with blocking and non-blocking sockets. But I'll start by talking about blocking sockets. You'll need to know how they work before dealing with non-blocking sockets. Part of the trouble with understanding these things is that "socket" can mean a number of subtly different things, depending on context. So first, let's make a distinction between a "client" socket - an endpoint of a conversation, and a "server" socket, which is more like a switchboard operator. The client application (your browser, for example) uses "client" sockets exclusively; the web server it's talking to uses both "server" sockets and "client" sockets. History¶ Of the various forms of IPC, sockets are by far the most popular. On any given platform, there are likely to be other forms of IPC that are faster, but for cross-platform communication, sockets are about the only game in town. They were invented in Berkeley as part of the BSD flavor of Unix. They spread like wildfire with the Internet. With good reason -- the combination of sockets with INET makes talking to arbitrary machines around the world unbelievably easy (at least compared to other schemes). Creating a Socket¶ Roughly speaking, when you clicked on the link that brought you to this page, your browser did something like the following: # create an INET, STREAMing socket s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) # now connect to the web server on port 80 - the normal http port s.connect(("www.python.org", 80)) When the connect completes, the socket s can be used to send in a request for t