the OS doesn't send SIGHUP on shutdown. Many daemons use SIGHUP for reloading config. The OS on shutdown will send SIGTERM and then follow with SIGKILL if needed.

In reply to Re^4: Why this daemon can only receive the HUP signal no more than one time? by Anonymous Monk
in thread Why this daemon can only receive the HUP signal no more than one time? by sunshine_august

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