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Echo server: Difference between revisions
→{{header|Tcl}}: A few notes
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=={{header|Tcl}}==
This code is single-threaded. It uses non-blocking I/O to perform the transfers, sitting on top of the event multiplexer system call (e.g., <code>select()</code> on Unix) to decide when to take new connections or service a particular socket. This makes this into a very lightweight echo server in terms of overall system resources.
<lang tcl># How to handle an incoming new connection
proc acceptEcho {chan host port} {
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