You cannot do that. Yes 9 is SIGKILL
and Unix system by design doesn't allow any script/program to trap SIGKILL
due to security reasons. Otherwise any script can trap & ignore SIGKILL which will make impossible to terminate that script by OS.
Why I am not getting signal SIGKILL on kill -9 command in bash?
题
In bash script I handle different signal as follows:
#!/bin/bash
sighdl ()
{
echo "signal caught"
#do something
exit 0
}
trap sighdl SIGKILL SIGINT SIGTERM
Above code handle signal properly for following activity:
- Ctrl+C
kill pid
pkill scriptname
For kill -9 pid
it does not call sighdl
. As per my understanding (if I am not wrong) kill -9
sends the SIGKILL signal.
Any idea?
解决方案
其他提示
Actually, you can trap SIGKILL in SunOS (Solaris), but not in Linux (validated in Red Hat).
In Linux you can kill the foreign process softly with
kill -15 $PID
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