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| TERM, INT |
Quick shutdown
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| QUIT |
Graceful shutdown 优雅的关闭进程，即等请求结束后再关闭 |
| KILL |
Halts a stubborn process |
| HUP |
Configuration reloadStart the new worker processes with a new configurationGracefully shutdown the old worker processes 改变配置文件，平滑的重读配置文件 |
| USR1 |
Reopen the log files 重读日志，在日志按日、月分割时有用 |
| USR2 |
Upgrade Executable on the fly 平滑的升级 |
| WINCH |
Gracefully shutdown the worker processes 优雅关闭旧的进程，配合user2来进行升级 |
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