The following
ioctl(2) calls which apply to SCSI CD-ROM drives are defined in the header files
<sys/cdio.h> and
<sys/disklabel.h>.
DIOCSDINFO
(
struct disklabel) Read or write the in-core copy of the disklabel for the drive. The disklabel is initialized with information read from the SCSI inquiry commands, and should be the same as the information printed at boot. This structure is defined in
disklabel(5).
CDIOCPLAYTRACKS
(
struct ioc_play_track) Start audio playback given a track address and length. The structure is defined as follows:
struct ioc_play_track
{
u_char start_track;
u_char start_index;
u_char end_track;
u_char end_index;
};
CDIOCPLAYBLOCKS
(
struct ioc_play_blocks) Start audio playback given a block address and length. The structure is defined as follows:
struct ioc_play_blocks
{
int blk;
int len;
};
CDIOCPLAYMSF
(
struct ioc_play_msf) Start audio playback given a `minutes-seconds-frames' address and length. The structure is defined as follows:
struct ioc_play_msf
{
u_char start_m;
u_char start_s;
u_char start_f;
u_char end_m;
u_char end_s;
u_char end_f;
};
CDIOCREADSUBCHANNEL
(
struct ioc_read_subchannel) Read information from the subchannel at the location specified by this structure:
struct ioc_read_subchannel {
u_char address_format;
#define CD_LBA_FORMAT 1
#define CD_MSF_FORMAT 2
u_char data_format;
#define CD_SUBQ_DATA 0
#define CD_CURRENT_POSITION 1
#define CD_MEDIA_CATALOG 2
#define CD_TRACK_INFO 3
u_char track;
int data_len;
struct cd_sub_channel_info *data;
};
CDIOREADTOCHEADER
(
struct ioc_toc_header) Return summary information about the table of contents for the mounted CD-ROM. The information is returned into the following structure:
struct ioc_toc_header {
u_short len;
u_char starting_track;
u_char ending_track;
};
CDIOREADTOCENTRYS
(
struct ioc_read_toc_entry) Return information from the table of contents entries mentioned. (Yes, this command name is misspelled). The argument structure is defined as follows:
struct ioc_read_toc_entry {
u_char address_format;
u_char starting_track;
u_short data_len;
struct cd_toc_entry *data;
};
The requested data is written into an area of size
data_len and pointed to by
data.
CDIOCSETPATCH
(
struct ioc_patch) Attach various audio channels to various output channels. The argument structure is defined thusly:
struct ioc_patch {
u_char patch[4];
/* one for each channel */
};
CDIOCSETVOL
(
struct ioc_vol) Get (set) information about the volume settings of the output channels. The argument structure is as follows:
struct ioc_vol
{
u_char vol[4];
/* one for each channel */
};
CDIOCSETMONO
Patch all output channels to all source channels.
CDIOCSETSTEREO
Patch left source channel to the left output channel and the right source channel to the right output channel.
CDIOCSETMUTE
Mute output without changing the volume settings.
CDIOCSETRIGHT
Attach both output channels to the left (right) source channel.
CDIOCCLRDEBUG
Turn on (off) debugging for the appropriate device.
CDIOCRESUME
Pause (resume) audio play, without resetting the location of the read-head.
CDIOCRESET
Reset the drive.
CDIOCSTOP
Tell the drive to spin-up (-down) the CD-ROM.
CDIOCPREVENT
Tell the drive to allow (prevent) manual ejection of the CD-ROM disc. Not all drives support this feature.
CDIOCEJECT
Eject the CD-ROM.
CDIOCLOADUNLOAD
Cause the ATAPI changer to load or unload discs.
CDIOCCLOSE
Tell the drive to close its door and load the media. Not all drives support this feature.
In addition the general
scsi(4) ioctls may be used with the
cd driver, if used against the `whole disk' partition (i.e.
/dev/rcd0d for the bebox and i386 port,
/dev/rcd0c for all other ports).