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From: "Intron" <mag@intron.ac>
To: des@des.no
Date: Mon, 14 Aug 2006 14:49:10 +0800
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Cc: freebsd-hackers@freebsd.org, Sean Bryant <bryants@gmail.com>
Subject: Re: Questions about devices and input.
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Dag-Erling  [iso-8859-1] Smo/rgrav wrote:

> "Sean Bryant" <bryants@gmail.com> writes:
>> I'm writing some cd buring software using burncd as a reference. I was
>> wondering if its possible to detect opening and closing of the doors.
> 
> Unfortunately, no.  The drive may not even have a door.
> 
> DES
> -- 
> Dag-Erling Smo/rgrav - des@des.no
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Mr. smo/rgrav loves playing joke very much. But most of CD/DVD drives
have a door, though generally speaking, software cannot detect the
open/close status of a door directly. However, software can command the
drive to open/close its door.

please see the source of cdcontrol(1):

     /usr/src/usr.sbin/cdcontrol/cdcontrol.c

In the function "int run (int cmd, char *arg)":

          case CMD_CLOSE:
                ...
          case CMD_EJECT:
                ...

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