为什么我在 bash 中的 kill -9 命令上没有收到信号 SIGKILL？
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Why I am not getting signal SIGKILL on kill -9 command in bash?
提问by Jayesh Bhoi
In bash script I handle different signal as follows:
在 bash 脚本中，我处理不同的信号如下：
#!/bin/bash
sighdl ()
{
echo "signal caught"
#do something
exit 0
}
trap sighdl SIGKILL SIGINT SIGTERM
Above code handle signal properly for following activity:
以上代码正确处理以下活动的信号：
- Ctrl+C
kill pidpkill scriptname
- Ctrl+C
kill pidpkill scriptname
For kill -9 pidit does not call sighdl. As per my understanding (if I am not wrong) kill -9sends the SIGKILL signal.
因为kill -9 pid它不调用sighdl。根据我的理解（如果我没记错的话）kill -9发送 SIGKILL 信号。
Any idea?
任何的想法？
回答by anubhava
You cannot do that. Yes 9 is SIGKILLand Unix system by design doesn't allow any script/program to trap SIGKILLdue to security reasons. Otherwise any script can trap & ignore SIGKILL which will make impossible to terminate that script by OS.
你不能这样做。是的 9 是SIGKILLUnix 系统的设计不允许任何脚本/程序SIGKILL由于安全原因而陷入困境。否则，任何脚本都可以捕获并忽略 SIGKILL，这将使操作系统无法终止该脚本。
