Queue up as many as 5 connect requests (the normal max) before refusing outsideĬonnections. If you’re playing around, use a nice high number (4įinally, the argument to listen tells the socket library that we want it to Specifies that the socket is reachable by any address the machine happens toĪ second thing to note: low number ports are usually reserved for “well known” If we had used s.bind(('localhost', 80)) or s.bind(('127.0.0.1', 80)) we would still have a “server” socket,īut one that was only visible within the same machine. listen ( 5 )Ī couple things to notice: we used socket.gethostname() so that the socket gethostname (), 80 )) # become a server socket serversocket. SOCK_STREAM ) # bind the socket to a public host, and a well-known port serversocket. # create an INET, STREAMing socket serversocket = socket. Your browser did something like the following: Roughly speaking, when you clicked on the link that brought you to this page, With INET makes talking to arbitrary machines around the world unbelievably easy With good reason - the combination of sockets They were invented in Berkeley as part of the BSD flavor of Unix. Likely to be other forms of IPC that are faster, but forĬross-platform communication, sockets are about the only game in town. Web server it’s talking to uses both “server” sockets and “client” sockets. The clientĪpplication (your browser, for example) uses “client” sockets exclusively the “server” socket, which is more like a switchboard operator. So first, let’s make aĭistinction between a “client” socket - an endpoint of a conversation, and a Number of subtly different things, depending on context. Part of the trouble with understanding these things is that “socket” can mean a You’ll need to know how they work before dealing with
But I’ll start by talking aboutīlocking sockets. Work with blocking and non-blocking sockets. Try to clear up the mystery of what a socket is, as well as some hints on how to Know what you’re doing (in which case this HOWTO isn’t for you!), you’ll getīetter behavior and performance from a STREAM socket than anything else. IPv4) sockets, but they account for at least 99% of I hope it will give you enough background to begin using them decently.
It doesn’t cover the fine points (and there are a lot of them), but It’s not really a tutorial - you’ll still have work to do in getting things This is a 10,000 foot overview of sockets. Sockets are used nearly everywhere, but are one of the most severely
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