How to load Linux kernel modules from C code?

Question

I have an application that has both two external kernel modules and a userspace daemon. I want to load the modules from the daemon code, written in C, at startup, and unload

Answer 1

I'd recommend against the use of system() in any daemon code that runs with root permissions as it's relatively easy to exploit from a security standpoint. modprobe and rmmod are, indeed, the right tools for the job. However, it'd be a bit cleaner and much more secure to use an explicit fork() + exec() to invoke them.