--- /dev/null
+| kill | status | start | stop | meaning |
+|------+--------+-------+------+----------------------------------------------------|
+| 0 | 0 | 0 | 0 | no request |
+| 0 | 0 | 0 | 1 | stop only |
+| 0 | 0 | 1 | 0 | start only |
+| 0 | 0 | 1 | 1 | start + stop (error) |
+| 0 | 1 | 0 | 0 | status only |
+| 0 | 1 | 0 | 1 | status + stop |
+| 0 | 1 | 1 | 0 | status + start |
+| 0 | 1 | 1 | 1 | status + start + stop (error, show status |
+| 1 | 0 | 0 | 0 | kill only |
+| 1 | 0 | 0 | 1 | kill + stop (error, kill) |
+| 1 | 0 | 1 | 0 | kill + start (error, kill) |
+| 1 | 0 | 1 | 1 | kill + start + stop (error, kill) |
+| 1 | 1 | 0 | 0 | kill + status |
+| 1 | 1 | 0 | 1 | kill + status + stop (error, kill, status) |
+| 1 | 1 | 1 | 0 | kill + status + start (error, kill) |
+| 1 | 1 | 1 | 1 | kill + status + start + stop (error, kill, status) |
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