Question

I want to know how to implement ioctl command for a character device in FreeBSD.
I already write a character device with open() close() read() write() but I don’t know what argument should I pass to ioctl_handler. Does anybody know the prototype of d_ioctl_t?

Answer 1

A quick google search found this page where d_ioctl_t is defined as:

typedef int d_ioctl_t(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td);