Mine

#include <sys/types.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <linux/cdrom.h>

int main(int argc,char **argv)
{
 int cdrom;
 if ((cdrom = open("/dev/cdrom",O_RDONLY | O_NONBLOCK) )  <0)
 {
 perror("open");
 exit(1);
 }
 if (ioctl(cdrom,CDROMEJECT,0)<0)
 {
  perror("ioctl");
  exit(1);
 }

 if (ioctl(cdrom,CDROMCLOSETRAY,0)<0)
 {
 perror("ioctl");
 exit(1);
 }
}