prometheus/vendor/github.com/nightlyone/lockfile/lockfile_unix.go

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// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
package lockfile
import (
"os"
"syscall"
)
func isRunning(pid int) (bool, error) {
proc, err := os.FindProcess(pid)
if err != nil {
return false, err
}
if err := proc.Signal(syscall.Signal(0)); err != nil {
return false, nil
}
return true, nil
}