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moby--moby/pkg/pidfile/pidfile_darwin.go

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// +build darwin
package pidfile // import "github.com/docker/docker/pkg/pidfile"
import (
"golang.org/x/sys/unix"
)
func processExists(pid int) bool {
// OS X does not have a proc filesystem.
// Use kill -0 pid to judge if the process exists.
err := unix.Kill(pid, 0)
return err == nil
}