67 lines
2.3 KiB
Go
67 lines
2.3 KiB
Go
/*
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* Copyright (c) 2013, 2014 Conformal Systems LLC <info@conformal.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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package main
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import (
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"os"
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"os/signal"
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)
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// interruptChannel is used to receive SIGINT (Ctrl+C) signals.
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var interruptChannel chan os.Signal
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// addHandlerChannel is used to add an interrupt handler to the list of handlers
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// to be invoked on SIGINT (Ctrl+C) signals.
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var addHandlerChannel = make(chan func())
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// mainInterruptHandler listens for SIGINT (Ctrl+C) signals on the
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// interruptChannel and invokes the registered interruptCallbacks accordingly.
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// It also listens for callback registration. It must be run as a goroutine.
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func mainInterruptHandler() {
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// interruptCallbacks is a list of callbacks to invoke when a
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// SIGINT (Ctrl+C) is received.
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var interruptCallbacks []func()
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for {
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select {
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case <-interruptChannel:
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log.Info("Received SIGINT (Ctrl+C). Shutting down...")
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// run handlers in LIFO order.
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for i := range interruptCallbacks {
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idx := len(interruptCallbacks) - 1 - i
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interruptCallbacks[idx]()
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}
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case handler := <-addHandlerChannel:
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interruptCallbacks = append(interruptCallbacks, handler)
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}
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}
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}
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// addInterruptHandler adds a handler to call when a SIGINT (Ctrl+C) is
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// received.
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func addInterruptHandler(handler func()) {
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// Create the channel and start the main interrupt handler which invokes
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// all other callbacks and exits if not already done.
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if interruptChannel == nil {
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interruptChannel = make(chan os.Signal, 1)
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signal.Notify(interruptChannel, os.Interrupt)
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go mainInterruptHandler()
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}
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addHandlerChannel <- handler
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}
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