This file is indexed.

/usr/share/gocode/src/github.com/docker/libnetwork/cmd/dnet/dnet_linux.go is in golang-github-docker-libnetwork-dev 0.8.0-dev.2+git20170202.599.45b4086-3.

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package main

import (
	"os"
	"os/signal"
	"syscall"

	psignal "github.com/docker/docker/pkg/signal"
)

func setupDumpStackTrap() {
	c := make(chan os.Signal, 1)
	signal.Notify(c, syscall.SIGUSR1)
	go func() {
		for range c {
			psignal.DumpStacks("")
		}
	}()
}