trayopen - beandog's mostly dvds multimedia wiki

====== trayopen (archives) ======

I wrote a similar program in C that does the same thing, but with more states.  See [[dvd_drive_status]].

==== Archives ====

This code has been a lifesaver to me when it comes to checking to see if a tray is open or not.  Believe it or not, there's nothing good out there to query it!  (And I've looked, too.)

Enter **trayopen**, a small piece of C code that was posted [[http://www.linuxquestions.org/questions/slackware-14/detect-cd-tray-status-4175450610/|on the linux questions forums]] by volkerdi.  (thanks!)

Here's the complete code:

<code>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <linux/cdrom.h>

int main(int argc,char **argv) {
  int cdrom;
  int status=1;

  if(argc == 0) {
    printf("Usage: trayopen [device]\n");
    printf("Result: Open tray exit code 0, closed tray exit code 1.\n");
  }

  if ((cdrom = open(argv[1],O_RDONLY | O_NONBLOCK)) < 0) {
    printf("Unable to open device %s. Provide a device name (/dev/sr0, /dev/cdrom) as a parameter.\n",argv[1]);
    exit(1);
  }

  if (ioctl(cdrom,CDROM_DRIVE_STATUS) == CDS_TRAY_OPEN) {
    status=0;
  }

  close(cdrom);
  exit(status);
}
</code>

Just download the code, and compile it with gcc:

<code>
gcc trayopen.c -o trayopen
</code>

Then, running it, it will return a 0 if it's open, or a 1 if it's closed.

Here's a sample bash script to call it:

<code>
#!/bin/bash
trayopen /dev/dvd
if [[ $? -eq 0 ]]; then
  echo "Open for business!"
elif [[ $? -eq 1 ]]; then
  echo "Sorry, already occupied."
fi
</code>
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