DragonflyBSDのカーネルモジュールでHello World

hello.c

#include <sys/param.h>
#include <sys/module.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/kthread.h>

static struct thread *hello_thread_data = NULL;

static void
hello_thread(void __unused *arg)
{
    static unsigned long i = 0;

    for (;;) {
        kprintf("%s:%lu\n", __FUNCTION__, i++);
        suspend_kproc(hello_thread_data, 1);
    }
}

static int
hello_create_thraed(void)
{
    int err = 0;

    err = kthread_create(&hello_thread, NULL, &hello_thread_data, "hello_thread");
    if (err) 
        kprintf("%s:Failed to create kernel thread\n", __FUNCTION__);

    return err;
}

static int
hello_event_handler(module_t mod, int what, void *arg)
{
	int ret = 0;

	switch (what) {
		case MOD_LOAD:
			kprintf("[-]hello module is loaded\n");
            hello_create_thraed();
			break;
		case MOD_UNLOAD:
			kprintf("[-]hello module is unloaded\n");
			break;
		default:
			kprintf("[-]unknown event\n");
			ret = EOPNOTSUPP;
			break;
	}

	return 0;
}

static moduledata_t hello_moduledata = { "hello", hello_event_handler, NULL };
DECLARE_MODULE(hello, hello_moduledata, SI_SUB_CONFIGURE, SI_ORDER_SECOND);
MODULE_VERSION(hello, 1);

Makefile

KMOD = hello

SRCS = hello.c

.include <bsd.kmod.mk>