CODEWITHSUNDEEP
driverkernel-moduleimplicit-declaration
user2884074
user2884074

Reputation: 93

implicit declaration of function when compiling kernel module

I am new to working in kernel space, so I hope someone can help me with the issue I am having.

I have seen a lot of questions related to implicit declaration of function for userspace c/c++ programs, but I think the issue I am having may be approached differently in kernel space.

The code I am working on is to test out signaling a user application from the driver, which I have working, but the issue was I could not use the function send_sig_info declared in linux/signal.h until I had declared it in the header of my own driver source. I figured if I had included to correct header to access the function call declared there, it should work.

So without the declaration of send_sig_info in my own header:

error: implicit declaration of function ‘send_sig_info’

And then adding to my header file:

static int send_sig_info(int sig, struct siginfo *info, struct task_struct *p);

would allow my code to compile just fine.

Does anyone have an idea why this is?

Thanks.

Upvotes: 3

Views: 3686

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