topic Re: CDROM locked in Operating System - Linux

CDROM locked

Juan M Leon — Thu, 11 Aug 2005 18:07:24 GMT

Hello I would like some orientation to write a c program to send unlock signal to cdrom. I have a problem wehre the cdrom was mounted using pfs and the terminal window was closed by accident. I killed the process and reboot the server however everytime that I attempt to mount the cd after the reboot it sayd that the device is busy. I dont think the device is damaged because I was able to mount the cdrom.
any help writing a c code using sctl_io to unlock the cd will be appreciated.

thanks in advance

Re: CDROM locked

Mel Burslan — Thu, 11 Aug 2005 19:03:54 GMT

when you run the command

pfs_mount

without any arguments, do you see your cdrom being mounted even though it refuses to mount it when you request it ??

Also did you try to mount the cdrom with the regular mount command instead of using pfs_mount ? And what response did you get for it ?

Re: CDROM locked

Stephen Keane — Fri, 12 Aug 2005 03:57:24 GMT

I can post some code snippets if you like?

Re: CDROM locked

Stephen Keane — Fri, 12 Aug 2005 04:26:03 GMT

Something like this maybe?

Re: CDROM locked

Juan M Leon — Fri, 12 Aug 2005 07:52:10 GMT

Jeff,

Thanks for the code, I tried to compile and I got the following error.
I am not much of C programmer I do scripting but not C.
(Bundled) cc: "unlockcd.c", line 7: warning 5: "const" will become a keyword.
(Bundled) cc: "unlockcd.c", line 7: error 1000: Unexpected symbol: "unsigned".
(Bundled) cc: "unlockcd.c", line 8: warning 5: "const" will become a keyword.
(Bundled) cc: "unlockcd.c", line 8: error 1000: Unexpected symbol: "unsigned".
(Bundled) cc: "unlockcd.c", line 9: warning 5: "const" will become a keyword.
(Bundled) cc: "unlockcd.c", line 9: error 1000: Unexpected symbol: "unsigned".
(Bundled) cc: "unlockcd.c", line 11: error 1705: Function prototypes are an ANSI feature.

and I conpiled using the following
cc unlockcd.c -o unlockcd

thanks for your help

Re: CDROM locked

Stephen Keane — Tue, 16 Aug 2005 09:31:39 GMT

Sorry, didn't realise you were using the built in 'cc' compiler, try this ...

Re: CDROM locked

Juan M Leon — Mon, 22 Aug 2005 07:26:48 GMT

Stephen,

Thanks for the updated code. seems to compile witgh no problems and seems to be doing something. the following lines shows what I did, however I am still unable to unlock the CD.

Usage : ./unlockcd cd_device
unix # ./unlockcd /dev/dsk/c1t1d0
Failed to open /dev/dsk/c1t1d0 because Device busy
unix # ./unlockcd /dev/dsk/c1t1d0
Failed to open /dev/dsk/c1t1d0 because Device busy
unix # ./unlockcd /dev/rdsk/c1t1d0
Drive /dev/rdsk/c1t1d0 unlocked
unix # mount /dev/dsk/c1t1d0 /cdrom
/dev/dsk/c5t2d0: Device busy
unix # ./unlockcd /dev/rdsk/c1t1d0
Drive /dev/rdsk/c1t1d0 unlocked
unix # ./unlockcd /dev/dsk/c1t1d0
Failed to open /dev/dsk/c1t1d0 because Device busy

I tried use the rdsk and seems to open unlock the device but if I try dsk it reports unable to open the device and cannot do anything. any suggestions.

Re: CDROM locked

Juan M Leon — Mon, 22 Aug 2005 07:56:25 GMT

Stephen, I think it took a little bit time before responding. now I am able to open the case and mount the cdrom.

Thanks for you help.