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

// +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
}