Suspend your machine

apm_ctldev.c

/* Does not work if apmd(8) is running. */
/* Requires read-write access to /dev/apmctl. */

#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <machine/apmvar.h>

#include <fcntl.h>
#include <stdio.h>
#include <err.h>

#define _PATH_APM_CTLDEV	"/dev/apmctl"

int
main(int argc, char *argv[])
{
	int	fd, ret;

        if ((fd = open(_PATH_APM_CTLDEV, O_RDWR)) == -1)
		err(1, "open");

        if ((ret = ioctl(fd, APM_IOC_SUSPEND, NULL)) == -1)
		err(1, "ioctl");

	printf("ioctl: %i\n", ret);

	return 0;
}