Add MacOS support

daemon/2server-pidToPath-Readlink.go

@@ -0,0 +1,14 @@
+//go:build linux || freebsd
+
+package daemon
+
+import (
+	"fmt"
+	"os"
+)
+
+// pidToPath returns the path of the executable that has the given PID.
+func pidToPath(pid int) string {
+	path, _ := os.Readlink(fmt.Sprintf("/proc/%d/"+pidPathFile, pid))
+	return path
+}