Makefile

KMOD=   badgermonkey
SRCS=   syscall.c

.include <bsd.kmod.mk>

syscall.c

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/module.h>
#include <sys/sysproto.h>
#include <sys/sysent.h>
#include <sys/kernel.h>
#include <sys/systm.h>

static int
badgers(struct thread *td, void *arg)
{

	printf("Badgers\n");
	return (0);
}

static int
monkeys(struct thread *td, void *arg)
{

	printf("Monkeys\n");
	return (0);
}

static struct sysent badgers_sysent = {
	0,			/* sy_narg */
	badgers			/* sy_call */
};

static struct sysent monkeys_sysent = {
	0,			/* sy_narg */
	monkeys			/* sy_call */
};

static int badgers_offset = NO_SYSCALL;
static int monkeys_offset = NO_SYSCALL;

static int
badgers_load(struct module *module, int cmd, void *arg)
{
	int error = 0;

	switch (cmd) {
	case MOD_LOAD :
		printf("badgers syscall loaded at %d\n", badgers_offset);
		break;
	case MOD_UNLOAD :
		printf("badgers syscall unloaded from %d\n", badgers_offset);
		break;
	default :
		error = EOPNOTSUPP;
		break;
	}
	return (error);
}

static int
monkeys_load(struct module *module, int cmd, void *arg)
{
	int error = 0;

	switch (cmd) {
	case MOD_LOAD :
		printf("monkeys syscall loaded at %d\n", monkeys_offset);
		break;
	case MOD_UNLOAD :
		printf("monkeys syscall unloaded from %d\n", monkeys_offset);
		break;
	default :
		error = EOPNOTSUPP;
		break;
	}
	return (error);
}

SYSCALL_MODULE(syscall_badgers, &badgers_offset, &badgers_sysent, badgers_load, NULL);
SYSCALL_MODULE(syscall_monkeys, &monkeys_offset, &monkeys_sysent, monkeys_load, NULL);