whether cd or dvd is inserted?

ur_prince · 12-17-2004, 03:48 AM

hi, i have dvd-rw in my system. is there anyway to know whether cd or dvd has beed inserted before writing? any ioctl call or some other way?
-prince

slakmagik · 12-17-2004, 10:03 AM

lsof | grep ${cdmp}

where cdmp is your cd mount point. For a test, something like

if [ ! -z "`lsof | grep ${cdmp}`" ]; then
do something
fi

May have holes in it, but it should work. But it sounds like you're asking a programming question and I don't know much of anything about that.

SlackerLX · 12-17-2004, 10:10 AM

Depends also on System and Environment you use, besides, of course, command line.

In Gnome, for instance, it's configurable via

Code:

APPLICATIONS->DESKTOP PREFERENCES->REMOVABLE STORAGE

bm17 · 12-17-2004, 11:40 AM

Are you polling or do you want async notification? This is tricky and it depends on whether you are using a SCSI or an IDE interface. Some drivers have the ability to asynchronously notify you of insertions while other drivers require you to poll them. One way or another this come down to sending a TEST_UNIT_READY ioctl command. You'll have to examine the driver source for details, or else look at another programs that does the same thing. Hurrah for open source.