CODEWITHSUNDEEP
clinuxprocess
user3822453
user3822453

Reputation: 55

Handling the signal generated by system reboot

Whenever I give reboot command, my process is receiving SIGTERM signal and is handling it. I don't want to handle it if the SIGTERM is due to reboot.

Please suggest me any idea.

Is there any way to send kill -9 signal to my process when I do system("reboot")?

I am using Cent OS (Linux).

Upvotes: 3

Views: 5365

Answers (3)

user3822453
user3822453

Reputation: 55

I found a solution for my question above and just wanted to update here. In /etc/init.d there is a file "halt". This halt is executed only on runlevel 0 and 6. i added a line "pkill -9 processname" before it it sends SIGTERM to all the processes.

Upvotes: 0

rslemos
rslemos

Reputation: 2730

whenever i give reboot command,my process is receiving SIGTERM signal and is handling it. I dont want to handle it if the SIGTERM is due to reboot.

You may try to run /sbin/runlevel in your signal handler (well, maybe process spawning is not even possible in a signal handler though) to get the current runlevel. Runlevel 6 is reboot.

Is there any way to send kill -9 signal to my process when i do system(reboot).

If your process is started by init scripts you can change the script so that stop is performed with kill -KILL instead of something else.

I am using Cent OS(linux).

I don't know if the following applies for CentOS.

In Debian, all remaining processes (the ones alive after all kill scripts have been ran) are signaled by /etc/init.d/sendsigs. If you have administrator access you can try to customize it so a specially named process (yours) get KILLed without TERMing before.

Still, all pids related in /run/sendsigs.omit and all pids related in files in /run/sendsigs.omit.d/ don't receive any signal.

Upvotes: 1

user149341
user149341

Reputation:

If your process is issuing the command to reboot the system, clearly it knows that the reboot is coming. Have it set up appropriate signal handlers beforehand, e.g.

signal(SIGTERM, SIG_IGN); // or SIG_DFL to restore default action (terminate process)
system("reboot");

Your process will still eventually get killed (via SIGKILL) right before the system halts, but that won't happen until a little later in the reboot process.

Upvotes: 0

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