seaweedfs/weed/util/grace/signal_handling.go

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//go:build !plan9
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// +build !plan9
package grace
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import (
"os"
"os/signal"
"sync"
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"syscall"
)
var signalChan chan os.Signal
var hooks = make([]func(), 0)
var hookLock sync.RWMutex
func init() {
signalChan = make(chan os.Signal, 1)
signal.Ignore(syscall.SIGHUP)
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signal.Notify(signalChan,
os.Interrupt,
os.Kill,
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syscall.SIGALRM,
// syscall.SIGHUP,
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syscall.SIGINT,
syscall.SIGTERM,
// syscall.SIGQUIT,
)
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go func() {
for range signalChan {
hookLock.RLock()
for _, hook := range hooks {
hook()
}
hookLock.RUnlock()
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os.Exit(0)
}
}()
}
func OnInterrupt(fn func()) {
// prevent reentry
hookLock.Lock()
defer hookLock.Unlock()
// deal with control+c,etc
// controlling terminal close, daemon not exit
hooks = append(hooks, fn)
}