CODEWITHSUNDEEP
linux-kernelkernel-module
XII
XII

Reputation: 558

How to catch a signal in a kernel module

I have a kernel module that has a while(1) loop in the init routine that is supposed to run infinitely.

If I have an equivalent code in a user space program, when I press Control+C the user space program is terminated, however this is not the case for a kernel module.

Is there a way to send a kill signal to the kernel module (when it is still running its init routine) so it can terminate / exit ?

Thanks in advance

Upvotes: 3

Views: 1645

Answers (1)

Tsyvarev
Tsyvarev

Reputation: 66153

In kernel you may use signal_pending() or fatal_signal_pending() for check whether signal/fatal signal is arrived:

while(!fatal_signal_pending(current) {
    // infinite loop
}

So, you may press Control+C for insmod <your-module.ko>, and module's init function will terminate the loop.

Kernel thread (created with kthread_create() or similar) may catch signals only if it allows them with allow_signal()

Upvotes: 5

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