A call of ioctl(.., CDIOCCAPABILITY, ...) on a cdrom or cd writer device 
(atapi or scsi) alwas returns errno == 25 (Inappropriate ioctl for device).

Fix: 

If I understand it correctly, cdioctl() in src/sys/cam/scsi/scsi_cd.c should 
handle this ioctl call, but I can not find the CDIOCCAPABILITY case. It 
should either be fixed or the corresponding entry in cd(4) should be removed.
How-To-Repeat: #include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <sys/cdio.h>
#include <sys/cdrio.h>
#include <sys/ioctl.h>

int main(int argc, char *argv [])
{
	int fd = open ("/dev/acd0c", O_RDONLY | O_NONBLOCK);
	struct ioc_capability cap; 
	int ret;
	cap.play_function = 0; cap.routing_function = 0; cap.special_function = 0;
	ret=ioctl(fd, CDIOCCAPABILITY, &cap);
	printf("fd: %d, ret: %d, errno: %d: %s\n", fd, ret, errno, strerror(errno));
	close(fd);
	return 0;
}