/* root-side probe: try to open /dev/psm0 while an unprivileged user
 * holds it. expect: EBUSY (device unavailable to moused/X/syscons). */
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
int main(void) {
	int fd = open("/dev/psm0", O_RDONLY | O_NONBLOCK);
	if (fd < 0) {
		printf("root open(/dev/psm0): %s  <-- moused(8)/X would fail "
		    "to start\n", strerror(errno));
		return (0);
	}
	printf("root open(/dev/psm0): OK (not held)\n");
	close(fd);
	return (0);
}