References: runtime.enableSigChan

var runtime.enableSigChan

4 uses

	runtime (current package)
		signal_unix.go#L92: 	enableSigChan   chan uint32
		signal_unix.go#L192: 		enableSigChan <- sig
		signal_unix.go#L871: 	enableSigChan = make(chan uint32)
		signal_unix.go#L890: 			case sig := <-enableSigChan:

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