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signal_nowindows.go
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/
signal_nowindows.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-present Datadog, Inc.
//go:build !windows
package util
import (
"os"
"os/signal"
"syscall"
"github.com/DataDog/datadog-agent/pkg/util/log"
)
// HandleSignals tells us whether we should exit.
func HandleSignals(exit chan struct{}) {
sigIn := make(chan os.Signal, 100)
signal.Notify(sigIn, syscall.SIGINT, syscall.SIGTERM, syscall.SIGPIPE)
// unix only in all likelihood; but we don't care.
for sig := range sigIn {
switch sig {
case syscall.SIGINT, syscall.SIGTERM:
log.Infof("Caught signal '%s'; terminating.", sig)
close(exit)
return
case syscall.SIGPIPE:
// By default systemd redirects the stdout to journald. When journald is stopped or crashes we receive a SIGPIPE signal.
// Go ignores SIGPIPE signals unless it is when stderr or stdout is closed, in this case the agent is stopped.
// We never want the agent to stop upon receiving SIGPIPE, so we intercept the SIGPIPE signals and just discard them.
// See https://golang.org/pkg/os/signal/#hdr-SIGPIPE
continue
}
}
}