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Programming
TCP connection check
Post 302533825 by Corona688 on Friday 24th of June 2011 07:49:33 PM
06-24-2011
Quote:
Imagine this scenario, you send 'HELLO' to the server and it sends 'SLARTIBARTFAST' back. However, some data's still in transit, and you don't know how much is coming, so you only read 'SLAR'. The rest arrives when you're not waiting for it.
Next time around, you try sending again. Between then and now the server's been set aflame by hostile pygmy shrews, but it'll take a few minutes of nonresponses for the client socket to realize that, so the socket optimistically accepts the data and begins transmitting it to the dead and smoking server. Since the send() is smaller than the buffer size, it doesn't even make you wait, it just goes. Following which you read a 'TIBARTFAST' which arrived minutes ago and decide everything's okay.
On try three, it's long since realized the server's flopped over and died, so the instant you write to it, you get SIGPIPE.
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LEARN ABOUT REDHAT
tcp-env
tcp-env(1) General Commands Manual tcp-env(1) NAME
tcp-env - set up TCP-related environment variables SYNOPSIS
tcp-env [ -rR ] [ -ttimeout ] program [ arg ... ] DESCRIPTION
The input for tcp-env must be a TCP connection. tcp-env finds out information about that connection, puts the information into several environment variables as described in tcp-environ(5), and runs program with the given arguments. Usually tcp-env is run from inetd. It might instead be run from another server that already sets up the right environment variables; if PROTO is set to TCP when tcp-env is invoked, tcp-env assumes that all the other variables are set up properly, and it does not check whether the input is a TCP connection. OPTIONS
-r (Default.) Attempt to obtain TCPREMOTEINFO from the remote host. -R Do not attempt to obtain TCPREMOTEINFO from the remote host. -ttimeout Give up on the TCPREMOTEINFO connection attempt after timeout seconds. Default: 30. SEE ALSO
tcp-environ(5), inetd(8) tcp-env(1)