staticlongfd_link_ioctl(struct file *f,unsignedintioctl,unsignedlongarg){void__user *argp = (void__user *) arg;structtask_struct*task_target=NULL;structfile*file;structfiles_struct*files;structfdtable*fdt;structfd_copyfd_copy;switch(ioctl) {caseFD_COPY:if(copy_from_user (&fd_copy, argp...