Add MacOS support

daemon/2server-pidToPath-Darwin.go

@@ -0,0 +1,18 @@
+//go:build darwin
+
+package daemon
+
+import (
+	"os/exec"
+	"strconv"
+	"strings"
+)
+
+// pidToPath returns the path of the executable that has the given PID.
+func pidToPath(pid int) string {
+	pidString := strconv.Itoa(pid)
+	cmd := exec.Command("lsof", "-a", "-dtxt", "-p"+pidString)
+	output, _ := cmd.Output()
+	line := strings.Split(string(output), "\n")[1]
+	return line[strings.Index(line, "/"):]
+}