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The Linux 2.4 SCSI subsystem HOWTO
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E.3. sr driver

E.3.1. sr compile options

None.

E.3.2. sr ioctls and user interface

See the following files: 

/usr/src/linux/include/linux/cdrom.h
/usr/src/linux/drivers/cdrom/cdrom.c [revision history section]
/usr/src/linux/Documentation/cdrom/cdrom-standard.tex

Some of the following ioctls are described in cdrom-standard.tex : 

CDROMCLOSETRAY
CDROM_SET_OPTIONS
CDROM_CLEAR_OPTIONS
CDROM_SELECT_SPEED
CDROM_SELECT_DISC
CDROM_MEDIA_CHANGED
CDROM_DRIVE_STATUS
CDROM_CHANGER_NSLOTS
CDROM_LOCKDOOR
CDROM_DEBUG
CDROM_GET_CAPABILITY
DVD_READ_STRUCT
DVD_WRITE_STRUCT
DVD_AUTH
CDROM_SEND_PACKET
CDROM_NEXT_WRITABLE
CDROM_LAST_WRITTEN

The O_NONBLOCK flag on the open() of scd devices is important. Without it the open() will wait until there is media in the device before returning. 

open()          O_NONBLOCK
close()
read()
write()
ioctl()

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