compiled-tools/cdstatus.c

   1 /* Begin C code. Put this in a file called cdstatus.c and do "gcc -o
   2 * cdstatus cdstatus.c" . No error checking, no looping, no
   3 * documentation, if it breaks, you get to keep both pieces. */
   4
   5 #include <stdio.h>
   6 #include <fcntl.h>
   7 #include <sys/types.h>
   8 #include <sys/stat.h>
   9 #include <sys/ioctl.h>
  10 #include <sys/wait.h>
  11 #include <sys/mtio.h>
  12 #include <linux/types.h>
  13 #include <linux/cdrom.h>
  14
  15 int main(int argc, char **argv) {
  16         char buff[256];
  17         /* ioctl() needs a 3rd arg but it doesn't really use it here. */
  18         int fd,status;
  19         int ec=1;
  20
  21         if(argc!=2) {
  22                 fprintf(stderr,"Usage: cdstatus <CD-ROM device name>\n");
  23                 return 1;
  24         }
  25
  26         fd=open(argv[1], O_RDONLY | O_NONBLOCK); /* need NONBLOCK! */
  27         if(fd < 0) {
  28                 snprintf(buff,64,"%s cannot be opened\n",argv[1]);
  29                 perror(buff);
  30                 return 1;
  31         }
  32         status=ioctl(fd,CDROM_DRIVE_STATUS,buff);
  33         close(fd);
  34
  35         switch(status) {
  36         case CDS_NO_INFO:
  37                 printf("Whoa. Huh?");
  38                 ec=2;
  39                 break;
  40         case CDS_NO_DISC:
  41                 printf("No disc is in the drive.");
  42                 ec=3;
  43                 break;
  44         case CDS_TRAY_OPEN:
  45                 printf("Tray is open, or tray is closed and no CD is present.");
  46                 ec=4;
  47                 break;
  48         case CDS_DRIVE_NOT_READY:
  49                 printf("Drive is not ready.");
  50                 ec=5;
  51                 break;
  52         case CDS_DISC_OK:
  53                 printf("A disc is in the drive.");
  54                 ec=0;
  55                 break;
  56         default:
  57                 printf("Um, we shouldn't be here!");
  58                 ec=1;
  59         }
  60         printf("\n");
  61
  62         return ec;
  63 }
  64
  65 /* end of C code */