[isg@interrupt:workspace/C]$ cc -Wall checkcdstatus.c -o checkcdstatus
[isg@interrupt:workspace/C]$ ./checkcdstatus                                                                                                   
Status: Tray is open
[isg@interrupt:workspace/C]$ ./checkcdstatus                                                                                                   
Status: Disc OK!

[isg@interrupt:workspace/C]$ cat -n checkcdstatus.c    
1   #include <linux/cdrom.h>
2   #include <stdio.h>
3   #include <sys/types.h>
4   #include <sys/stat.h>
5   #include <sys/ioctl.h>
6   #include <fcntl.h>
7   #include <errno.h>
8   
9   // from <linux/cdrom.h>
10  //#define CDS_NO_INFO           0   
11  //#define CDS_NO_DISC               1
12  //#define CDS_TRAY_OPEN             2
13  //#define CDS_DRIVE_NOT_READY       3
14  //#define CDS_DISC_OK               4
15  
16  //return drive status
17  char*
18  status(int r)
19  {
20      switch(r)
21      {
22          case 0:
23              return "Not implemented";
24          case 1:
25              return "No disc loaded";
26          case 2:
27              return "Tray is open";
28          case 3:
29              return "Drive not ready";
30          case 4:
31              return "Disc OK!";
32          default:
33              return "Houston we have a problem here";
34      }
35      
36  }
37  
38  
39  int
40  main()
41  {
42      int fd = open("/dev/scd0", O_RDWR|O_EXCL|O_NONBLOCK);
43      int res = ioctl(fd, CDROM_DRIVE_STATUS,0);
44      printf("Status: %s\n", status(res));
45      if (errno)
46          perror("Error occured");
47  
48  return 0;
49  
50  }

Enjoy!

A friend asked me as he is interested in Mono and he wants to work on some project at university.