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1233 lines
20 KiB
1233 lines
20 KiB
============================ |
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Summary of CDROM ioctl calls |
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============================ |
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|
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- Edward A. Falk <[email protected]> |
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|
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November, 2004 |
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|
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This document attempts to describe the ioctl(2) calls supported by |
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the CDROM layer. These are by-and-large implemented (as of Linux 2.6) |
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in drivers/cdrom/cdrom.c and drivers/block/scsi_ioctl.c |
|
|
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ioctl values are listed in <linux/cdrom.h>. As of this writing, they |
|
are as follows: |
|
|
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====================== =============================================== |
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CDROMPAUSE Pause Audio Operation |
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CDROMRESUME Resume paused Audio Operation |
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CDROMPLAYMSF Play Audio MSF (struct cdrom_msf) |
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CDROMPLAYTRKIND Play Audio Track/index (struct cdrom_ti) |
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CDROMREADTOCHDR Read TOC header (struct cdrom_tochdr) |
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CDROMREADTOCENTRY Read TOC entry (struct cdrom_tocentry) |
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CDROMSTOP Stop the cdrom drive |
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CDROMSTART Start the cdrom drive |
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CDROMEJECT Ejects the cdrom media |
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CDROMVOLCTRL Control output volume (struct cdrom_volctrl) |
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CDROMSUBCHNL Read subchannel data (struct cdrom_subchnl) |
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CDROMREADMODE2 Read CDROM mode 2 data (2336 Bytes) |
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(struct cdrom_read) |
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CDROMREADMODE1 Read CDROM mode 1 data (2048 Bytes) |
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(struct cdrom_read) |
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CDROMREADAUDIO (struct cdrom_read_audio) |
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CDROMEJECT_SW enable(1)/disable(0) auto-ejecting |
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CDROMMULTISESSION Obtain the start-of-last-session |
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address of multi session disks |
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(struct cdrom_multisession) |
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CDROM_GET_MCN Obtain the "Universal Product Code" |
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if available (struct cdrom_mcn) |
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CDROM_GET_UPC Deprecated, use CDROM_GET_MCN instead. |
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CDROMRESET hard-reset the drive |
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CDROMVOLREAD Get the drive's volume setting |
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(struct cdrom_volctrl) |
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CDROMREADRAW read data in raw mode (2352 Bytes) |
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(struct cdrom_read) |
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CDROMREADCOOKED read data in cooked mode |
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CDROMSEEK seek msf address |
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CDROMPLAYBLK scsi-cd only, (struct cdrom_blk) |
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CDROMREADALL read all 2646 bytes |
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CDROMGETSPINDOWN return 4-bit spindown value |
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CDROMSETSPINDOWN set 4-bit spindown value |
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CDROMCLOSETRAY pendant of CDROMEJECT |
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CDROM_SET_OPTIONS Set behavior options |
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CDROM_CLEAR_OPTIONS Clear behavior options |
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CDROM_SELECT_SPEED Set the CD-ROM speed |
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CDROM_SELECT_DISC Select disc (for juke-boxes) |
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CDROM_MEDIA_CHANGED Check is media changed |
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CDROM_DRIVE_STATUS Get tray position, etc. |
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CDROM_DISC_STATUS Get disc type, etc. |
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CDROM_CHANGER_NSLOTS Get number of slots |
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CDROM_LOCKDOOR lock or unlock door |
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CDROM_DEBUG Turn debug messages on/off |
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CDROM_GET_CAPABILITY get capabilities |
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CDROMAUDIOBUFSIZ set the audio buffer size |
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DVD_READ_STRUCT Read structure |
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DVD_WRITE_STRUCT Write structure |
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DVD_AUTH Authentication |
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CDROM_SEND_PACKET send a packet to the drive |
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CDROM_NEXT_WRITABLE get next writable block |
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CDROM_LAST_WRITTEN get last block written on disc |
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====================== =============================================== |
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|
|
|
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The information that follows was determined from reading kernel source |
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code. It is likely that some corrections will be made over time. |
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|
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------------------------------------------------------------------------------ |
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|
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General: |
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|
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Unless otherwise specified, all ioctl calls return 0 on success |
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and -1 with errno set to an appropriate value on error. (Some |
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ioctls return non-negative data values.) |
|
|
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Unless otherwise specified, all ioctl calls return -1 and set |
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errno to EFAULT on a failed attempt to copy data to or from user |
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address space. |
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|
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Individual drivers may return error codes not listed here. |
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|
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Unless otherwise specified, all data structures and constants |
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are defined in <linux/cdrom.h> |
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|
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------------------------------------------------------------------------------ |
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CDROMPAUSE |
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Pause Audio Operation |
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usage:: |
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ioctl(fd, CDROMPAUSE, 0); |
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inputs: |
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none |
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outputs: |
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none |
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error return: |
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- ENOSYS cd drive not audio-capable. |
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CDROMRESUME |
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Resume paused Audio Operation |
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|
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usage:: |
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ioctl(fd, CDROMRESUME, 0); |
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inputs: |
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none |
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|
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outputs: |
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none |
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error return: |
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- ENOSYS cd drive not audio-capable. |
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CDROMPLAYMSF |
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Play Audio MSF |
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(struct cdrom_msf) |
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usage:: |
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struct cdrom_msf msf; |
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ioctl(fd, CDROMPLAYMSF, &msf); |
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inputs: |
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cdrom_msf structure, describing a segment of music to play |
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outputs: |
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none |
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error return: |
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- ENOSYS cd drive not audio-capable. |
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|
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notes: |
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- MSF stands for minutes-seconds-frames |
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- LBA stands for logical block address |
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- Segment is described as start and end times, where each time |
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is described as minutes:seconds:frames. |
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A frame is 1/75 of a second. |
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CDROMPLAYTRKIND |
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Play Audio Track/index |
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|
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(struct cdrom_ti) |
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usage:: |
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struct cdrom_ti ti; |
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ioctl(fd, CDROMPLAYTRKIND, &ti); |
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inputs: |
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cdrom_ti structure, describing a segment of music to play |
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outputs: |
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none |
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error return: |
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- ENOSYS cd drive not audio-capable. |
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|
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notes: |
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- Segment is described as start and end times, where each time |
|
is described as a track and an index. |
|
|
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CDROMREADTOCHDR |
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Read TOC header |
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(struct cdrom_tochdr) |
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usage:: |
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|
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cdrom_tochdr header; |
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ioctl(fd, CDROMREADTOCHDR, &header); |
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inputs: |
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cdrom_tochdr structure |
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outputs: |
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cdrom_tochdr structure |
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error return: |
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- ENOSYS cd drive not audio-capable. |
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CDROMREADTOCENTRY |
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Read TOC entry |
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(struct cdrom_tocentry) |
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usage:: |
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struct cdrom_tocentry entry; |
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ioctl(fd, CDROMREADTOCENTRY, &entry); |
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inputs: |
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cdrom_tocentry structure |
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outputs: |
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cdrom_tocentry structure |
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error return: |
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- ENOSYS cd drive not audio-capable. |
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- EINVAL entry.cdte_format not CDROM_MSF or CDROM_LBA |
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- EINVAL requested track out of bounds |
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- EIO I/O error reading TOC |
|
|
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notes: |
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- TOC stands for Table Of Contents |
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- MSF stands for minutes-seconds-frames |
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- LBA stands for logical block address |
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CDROMSTOP |
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Stop the cdrom drive |
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usage:: |
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ioctl(fd, CDROMSTOP, 0); |
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inputs: |
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none |
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outputs: |
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none |
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error return: |
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- ENOSYS cd drive not audio-capable. |
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|
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notes: |
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- Exact interpretation of this ioctl depends on the device, |
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but most seem to spin the drive down. |
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CDROMSTART |
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Start the cdrom drive |
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usage:: |
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ioctl(fd, CDROMSTART, 0); |
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inputs: |
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none |
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outputs: |
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none |
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error return: |
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- ENOSYS cd drive not audio-capable. |
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|
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notes: |
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- Exact interpretation of this ioctl depends on the device, |
|
but most seem to spin the drive up and/or close the tray. |
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Other devices ignore the ioctl completely. |
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|
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CDROMEJECT |
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- Ejects the cdrom media |
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|
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usage:: |
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ioctl(fd, CDROMEJECT, 0); |
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|
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inputs: |
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none |
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outputs: |
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none |
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error returns: |
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- ENOSYS cd drive not capable of ejecting |
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- EBUSY other processes are accessing drive, or door is locked |
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notes: |
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- See CDROM_LOCKDOOR, below. |
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CDROMCLOSETRAY |
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pendant of CDROMEJECT |
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usage:: |
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ioctl(fd, CDROMCLOSETRAY, 0); |
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inputs: |
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none |
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outputs: |
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none |
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error returns: |
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- ENOSYS cd drive not capable of closing the tray |
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- EBUSY other processes are accessing drive, or door is locked |
|
|
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notes: |
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- See CDROM_LOCKDOOR, below. |
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|
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CDROMVOLCTRL |
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Control output volume (struct cdrom_volctrl) |
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|
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usage:: |
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struct cdrom_volctrl volume; |
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ioctl(fd, CDROMVOLCTRL, &volume); |
|
|
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inputs: |
|
cdrom_volctrl structure containing volumes for up to 4 |
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channels. |
|
|
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outputs: |
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none |
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|
|
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error return: |
|
- ENOSYS cd drive not audio-capable. |
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|
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CDROMVOLREAD |
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Get the drive's volume setting |
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|
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(struct cdrom_volctrl) |
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|
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usage:: |
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|
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struct cdrom_volctrl volume; |
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ioctl(fd, CDROMVOLREAD, &volume); |
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inputs: |
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none |
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|
|
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outputs: |
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The current volume settings. |
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|
|
|
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error return: |
|
- ENOSYS cd drive not audio-capable. |
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|
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CDROMSUBCHNL |
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Read subchannel data |
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|
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(struct cdrom_subchnl) |
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|
|
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usage:: |
|
|
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struct cdrom_subchnl q; |
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|
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ioctl(fd, CDROMSUBCHNL, &q); |
|
|
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inputs: |
|
cdrom_subchnl structure |
|
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outputs: |
|
cdrom_subchnl structure |
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|
|
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error return: |
|
- ENOSYS cd drive not audio-capable. |
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- EINVAL format not CDROM_MSF or CDROM_LBA |
|
|
|
notes: |
|
- Format is converted to CDROM_MSF or CDROM_LBA |
|
as per user request on return |
|
|
|
|
|
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CDROMREADRAW |
|
read data in raw mode (2352 Bytes) |
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|
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(struct cdrom_read) |
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|
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usage:: |
|
|
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union { |
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|
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struct cdrom_msf msf; /* input */ |
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char buffer[CD_FRAMESIZE_RAW]; /* return */ |
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} arg; |
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ioctl(fd, CDROMREADRAW, &arg); |
|
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inputs: |
|
cdrom_msf structure indicating an address to read. |
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|
|
Only the start values are significant. |
|
|
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outputs: |
|
Data written to address provided by user. |
|
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|
|
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error return: |
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- EINVAL address less than 0, or msf less than 0:2:0 |
|
- ENOMEM out of memory |
|
|
|
notes: |
|
- As of 2.6.8.1, comments in <linux/cdrom.h> indicate that this |
|
ioctl accepts a cdrom_read structure, but actual source code |
|
reads a cdrom_msf structure and writes a buffer of data to |
|
the same address. |
|
|
|
- MSF values are converted to LBA values via this formula:: |
|
|
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lba = (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET; |
|
|
|
|
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CDROMREADMODE1 |
|
Read CDROM mode 1 data (2048 Bytes) |
|
|
|
(struct cdrom_read) |
|
|
|
notes: |
|
Identical to CDROMREADRAW except that block size is |
|
CD_FRAMESIZE (2048) bytes |
|
|
|
|
|
|
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CDROMREADMODE2 |
|
Read CDROM mode 2 data (2336 Bytes) |
|
|
|
(struct cdrom_read) |
|
|
|
notes: |
|
Identical to CDROMREADRAW except that block size is |
|
CD_FRAMESIZE_RAW0 (2336) bytes |
|
|
|
|
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|
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CDROMREADAUDIO |
|
(struct cdrom_read_audio) |
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|
|
usage:: |
|
|
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struct cdrom_read_audio ra; |
|
|
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ioctl(fd, CDROMREADAUDIO, &ra); |
|
|
|
inputs: |
|
cdrom_read_audio structure containing read start |
|
point and length |
|
|
|
outputs: |
|
audio data, returned to buffer indicated by ra |
|
|
|
|
|
error return: |
|
- EINVAL format not CDROM_MSF or CDROM_LBA |
|
- EINVAL nframes not in range [1 75] |
|
- ENXIO drive has no queue (probably means invalid fd) |
|
- ENOMEM out of memory |
|
|
|
|
|
CDROMEJECT_SW |
|
enable(1)/disable(0) auto-ejecting |
|
|
|
|
|
usage:: |
|
|
|
int val; |
|
|
|
ioctl(fd, CDROMEJECT_SW, val); |
|
|
|
inputs: |
|
Flag specifying auto-eject flag. |
|
|
|
|
|
outputs: |
|
none |
|
|
|
|
|
error return: |
|
- ENOSYS Drive is not capable of ejecting. |
|
- EBUSY Door is locked |
|
|
|
|
|
|
|
|
|
CDROMMULTISESSION |
|
Obtain the start-of-last-session address of multi session disks |
|
|
|
(struct cdrom_multisession) |
|
|
|
usage:: |
|
|
|
struct cdrom_multisession ms_info; |
|
|
|
ioctl(fd, CDROMMULTISESSION, &ms_info); |
|
|
|
inputs: |
|
cdrom_multisession structure containing desired |
|
|
|
format. |
|
|
|
outputs: |
|
cdrom_multisession structure is filled with last_session |
|
information. |
|
|
|
error return: |
|
- EINVAL format not CDROM_MSF or CDROM_LBA |
|
|
|
|
|
CDROM_GET_MCN |
|
Obtain the "Universal Product Code" |
|
if available |
|
|
|
(struct cdrom_mcn) |
|
|
|
|
|
usage:: |
|
|
|
struct cdrom_mcn mcn; |
|
|
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ioctl(fd, CDROM_GET_MCN, &mcn); |
|
|
|
inputs: |
|
none |
|
|
|
|
|
outputs: |
|
Universal Product Code |
|
|
|
|
|
error return: |
|
- ENOSYS Drive is not capable of reading MCN data. |
|
|
|
notes: |
|
- Source code comments state:: |
|
|
|
The following function is implemented, although very few |
|
audio discs give Universal Product Code information, which |
|
should just be the Medium Catalog Number on the box. Note, |
|
that the way the code is written on the CD is /not/ uniform |
|
across all discs! |
|
|
|
|
|
|
|
|
|
CDROM_GET_UPC |
|
CDROM_GET_MCN (deprecated) |
|
|
|
|
|
Not implemented, as of 2.6.8.1 |
|
|
|
|
|
|
|
CDROMRESET |
|
hard-reset the drive |
|
|
|
|
|
usage:: |
|
|
|
ioctl(fd, CDROMRESET, 0); |
|
|
|
|
|
inputs: |
|
none |
|
|
|
|
|
outputs: |
|
none |
|
|
|
|
|
error return: |
|
- EACCES Access denied: requires CAP_SYS_ADMIN |
|
- ENOSYS Drive is not capable of resetting. |
|
|
|
|
|
|
|
|
|
CDROMREADCOOKED |
|
read data in cooked mode |
|
|
|
|
|
usage:: |
|
|
|
u8 buffer[CD_FRAMESIZE] |
|
|
|
ioctl(fd, CDROMREADCOOKED, buffer); |
|
|
|
inputs: |
|
none |
|
|
|
|
|
outputs: |
|
2048 bytes of data, "cooked" mode. |
|
|
|
|
|
notes: |
|
Not implemented on all drives. |
|
|
|
|
|
|
|
|
|
|
|
CDROMREADALL |
|
read all 2646 bytes |
|
|
|
|
|
Same as CDROMREADCOOKED, but reads 2646 bytes. |
|
|
|
|
|
|
|
CDROMSEEK |
|
seek msf address |
|
|
|
|
|
usage:: |
|
|
|
struct cdrom_msf msf; |
|
|
|
ioctl(fd, CDROMSEEK, &msf); |
|
|
|
inputs: |
|
MSF address to seek to. |
|
|
|
|
|
outputs: |
|
none |
|
|
|
|
|
|
|
|
|
CDROMPLAYBLK |
|
scsi-cd only |
|
|
|
(struct cdrom_blk) |
|
|
|
|
|
usage:: |
|
|
|
struct cdrom_blk blk; |
|
|
|
ioctl(fd, CDROMPLAYBLK, &blk); |
|
|
|
inputs: |
|
Region to play |
|
|
|
|
|
outputs: |
|
none |
|
|
|
|
|
|
|
|
|
CDROMGETSPINDOWN |
|
usage:: |
|
|
|
char spindown; |
|
|
|
ioctl(fd, CDROMGETSPINDOWN, &spindown); |
|
|
|
inputs: |
|
none |
|
|
|
|
|
outputs: |
|
The value of the current 4-bit spindown value. |
|
|
|
|
|
|
|
|
|
|
|
CDROMSETSPINDOWN |
|
usage:: |
|
|
|
char spindown |
|
|
|
ioctl(fd, CDROMSETSPINDOWN, &spindown); |
|
|
|
inputs: |
|
4-bit value used to control spindown (TODO: more detail here) |
|
|
|
|
|
outputs: |
|
none |
|
|
|
|
|
|
|
|
|
|
|
|
|
CDROM_SET_OPTIONS |
|
Set behavior options |
|
|
|
|
|
usage:: |
|
|
|
int options; |
|
|
|
ioctl(fd, CDROM_SET_OPTIONS, options); |
|
|
|
inputs: |
|
New values for drive options. The logical 'or' of: |
|
|
|
============== ================================== |
|
CDO_AUTO_CLOSE close tray on first open(2) |
|
CDO_AUTO_EJECT open tray on last release |
|
CDO_USE_FFLAGS use O_NONBLOCK information on open |
|
CDO_LOCK lock tray on open files |
|
CDO_CHECK_TYPE check type on open for data |
|
============== ================================== |
|
|
|
outputs: |
|
Returns the resulting options settings in the |
|
ioctl return value. Returns -1 on error. |
|
|
|
error return: |
|
- ENOSYS selected option(s) not supported by drive. |
|
|
|
|
|
|
|
|
|
CDROM_CLEAR_OPTIONS |
|
Clear behavior options |
|
|
|
|
|
Same as CDROM_SET_OPTIONS, except that selected options are |
|
turned off. |
|
|
|
|
|
|
|
CDROM_SELECT_SPEED |
|
Set the CD-ROM speed |
|
|
|
|
|
usage:: |
|
|
|
int speed; |
|
|
|
ioctl(fd, CDROM_SELECT_SPEED, speed); |
|
|
|
inputs: |
|
New drive speed. |
|
|
|
|
|
outputs: |
|
none |
|
|
|
|
|
error return: |
|
- ENOSYS speed selection not supported by drive. |
|
|
|
|
|
|
|
CDROM_SELECT_DISC |
|
Select disc (for juke-boxes) |
|
|
|
|
|
usage:: |
|
|
|
int disk; |
|
|
|
ioctl(fd, CDROM_SELECT_DISC, disk); |
|
|
|
inputs: |
|
Disk to load into drive. |
|
|
|
|
|
outputs: |
|
none |
|
|
|
|
|
error return: |
|
- EINVAL Disk number beyond capacity of drive |
|
|
|
|
|
|
|
CDROM_MEDIA_CHANGED |
|
Check is media changed |
|
|
|
|
|
usage:: |
|
|
|
int slot; |
|
|
|
ioctl(fd, CDROM_MEDIA_CHANGED, slot); |
|
|
|
inputs: |
|
Slot number to be tested, always zero except for jukeboxes. |
|
|
|
May also be special values CDSL_NONE or CDSL_CURRENT |
|
|
|
outputs: |
|
Ioctl return value is 0 or 1 depending on whether the media |
|
|
|
has been changed, or -1 on error. |
|
|
|
error returns: |
|
- ENOSYS Drive can't detect media change |
|
- EINVAL Slot number beyond capacity of drive |
|
- ENOMEM Out of memory |
|
|
|
|
|
|
|
CDROM_DRIVE_STATUS |
|
Get tray position, etc. |
|
|
|
|
|
usage:: |
|
|
|
int slot; |
|
|
|
ioctl(fd, CDROM_DRIVE_STATUS, slot); |
|
|
|
inputs: |
|
Slot number to be tested, always zero except for jukeboxes. |
|
|
|
May also be special values CDSL_NONE or CDSL_CURRENT |
|
|
|
outputs: |
|
Ioctl return value will be one of the following values |
|
|
|
from <linux/cdrom.h>: |
|
|
|
=================== ========================== |
|
CDS_NO_INFO Information not available. |
|
CDS_NO_DISC |
|
CDS_TRAY_OPEN |
|
CDS_DRIVE_NOT_READY |
|
CDS_DISC_OK |
|
-1 error |
|
=================== ========================== |
|
|
|
error returns: |
|
- ENOSYS Drive can't detect drive status |
|
- EINVAL Slot number beyond capacity of drive |
|
- ENOMEM Out of memory |
|
|
|
|
|
|
|
|
|
CDROM_DISC_STATUS |
|
Get disc type, etc. |
|
|
|
|
|
usage:: |
|
|
|
ioctl(fd, CDROM_DISC_STATUS, 0); |
|
|
|
|
|
inputs: |
|
none |
|
|
|
|
|
outputs: |
|
Ioctl return value will be one of the following values |
|
|
|
from <linux/cdrom.h>: |
|
|
|
- CDS_NO_INFO |
|
- CDS_AUDIO |
|
- CDS_MIXED |
|
- CDS_XA_2_2 |
|
- CDS_XA_2_1 |
|
- CDS_DATA_1 |
|
|
|
error returns: |
|
none at present |
|
|
|
notes: |
|
- Source code comments state:: |
|
|
|
|
|
Ok, this is where problems start. The current interface for |
|
the CDROM_DISC_STATUS ioctl is flawed. It makes the false |
|
assumption that CDs are all CDS_DATA_1 or all CDS_AUDIO, etc. |
|
Unfortunately, while this is often the case, it is also |
|
very common for CDs to have some tracks with data, and some |
|
tracks with audio. Just because I feel like it, I declare |
|
the following to be the best way to cope. If the CD has |
|
ANY data tracks on it, it will be returned as a data CD. |
|
If it has any XA tracks, I will return it as that. Now I |
|
could simplify this interface by combining these returns with |
|
the above, but this more clearly demonstrates the problem |
|
with the current interface. Too bad this wasn't designed |
|
to use bitmasks... -Erik |
|
|
|
Well, now we have the option CDS_MIXED: a mixed-type CD. |
|
User level programmers might feel the ioctl is not very |
|
useful. |
|
---david |
|
|
|
|
|
|
|
|
|
CDROM_CHANGER_NSLOTS |
|
Get number of slots |
|
|
|
|
|
usage:: |
|
|
|
ioctl(fd, CDROM_CHANGER_NSLOTS, 0); |
|
|
|
|
|
inputs: |
|
none |
|
|
|
|
|
outputs: |
|
The ioctl return value will be the number of slots in a |
|
CD changer. Typically 1 for non-multi-disk devices. |
|
|
|
error returns: |
|
none |
|
|
|
|
|
|
|
CDROM_LOCKDOOR |
|
lock or unlock door |
|
|
|
|
|
usage:: |
|
|
|
int lock; |
|
|
|
ioctl(fd, CDROM_LOCKDOOR, lock); |
|
|
|
inputs: |
|
Door lock flag, 1=lock, 0=unlock |
|
|
|
|
|
outputs: |
|
none |
|
|
|
|
|
error returns: |
|
- EDRIVE_CANT_DO_THIS |
|
|
|
Door lock function not supported. |
|
- EBUSY |
|
|
|
Attempt to unlock when multiple users |
|
have the drive open and not CAP_SYS_ADMIN |
|
|
|
notes: |
|
As of 2.6.8.1, the lock flag is a global lock, meaning that |
|
all CD drives will be locked or unlocked together. This is |
|
probably a bug. |
|
|
|
The EDRIVE_CANT_DO_THIS value is defined in <linux/cdrom.h> |
|
and is currently (2.6.8.1) the same as EOPNOTSUPP |
|
|
|
|
|
|
|
CDROM_DEBUG |
|
Turn debug messages on/off |
|
|
|
|
|
usage:: |
|
|
|
int debug; |
|
|
|
ioctl(fd, CDROM_DEBUG, debug); |
|
|
|
inputs: |
|
Cdrom debug flag, 0=disable, 1=enable |
|
|
|
|
|
outputs: |
|
The ioctl return value will be the new debug flag. |
|
|
|
|
|
error return: |
|
- EACCES Access denied: requires CAP_SYS_ADMIN |
|
|
|
|
|
|
|
CDROM_GET_CAPABILITY |
|
get capabilities |
|
|
|
|
|
usage:: |
|
|
|
ioctl(fd, CDROM_GET_CAPABILITY, 0); |
|
|
|
|
|
inputs: |
|
none |
|
|
|
|
|
outputs: |
|
The ioctl return value is the current device capability |
|
flags. See CDC_CLOSE_TRAY, CDC_OPEN_TRAY, etc. |
|
|
|
|
|
|
|
CDROMAUDIOBUFSIZ |
|
set the audio buffer size |
|
|
|
|
|
usage:: |
|
|
|
int arg; |
|
|
|
ioctl(fd, CDROMAUDIOBUFSIZ, val); |
|
|
|
inputs: |
|
New audio buffer size |
|
|
|
|
|
outputs: |
|
The ioctl return value is the new audio buffer size, or -1 |
|
on error. |
|
|
|
error return: |
|
- ENOSYS Not supported by this driver. |
|
|
|
notes: |
|
Not supported by all drivers. |
|
|
|
|
|
|
|
|
|
DVD_READ_STRUCT Read structure |
|
|
|
usage:: |
|
|
|
dvd_struct s; |
|
|
|
ioctl(fd, DVD_READ_STRUCT, &s); |
|
|
|
inputs: |
|
dvd_struct structure, containing: |
|
|
|
=================== ========================================== |
|
type specifies the information desired, one of |
|
DVD_STRUCT_PHYSICAL, DVD_STRUCT_COPYRIGHT, |
|
DVD_STRUCT_DISCKEY, DVD_STRUCT_BCA, |
|
DVD_STRUCT_MANUFACT |
|
physical.layer_num desired layer, indexed from 0 |
|
copyright.layer_num desired layer, indexed from 0 |
|
disckey.agid |
|
=================== ========================================== |
|
|
|
outputs: |
|
dvd_struct structure, containing: |
|
|
|
=================== ================================ |
|
physical for type == DVD_STRUCT_PHYSICAL |
|
copyright for type == DVD_STRUCT_COPYRIGHT |
|
disckey.value for type == DVD_STRUCT_DISCKEY |
|
bca.{len,value} for type == DVD_STRUCT_BCA |
|
manufact.{len,valu} for type == DVD_STRUCT_MANUFACT |
|
=================== ================================ |
|
|
|
error returns: |
|
- EINVAL physical.layer_num exceeds number of layers |
|
- EIO Received invalid response from drive |
|
|
|
|
|
|
|
DVD_WRITE_STRUCT Write structure |
|
|
|
Not implemented, as of 2.6.8.1 |
|
|
|
|
|
|
|
DVD_AUTH Authentication |
|
|
|
usage:: |
|
|
|
dvd_authinfo ai; |
|
|
|
ioctl(fd, DVD_AUTH, &ai); |
|
|
|
inputs: |
|
dvd_authinfo structure. See <linux/cdrom.h> |
|
|
|
|
|
outputs: |
|
dvd_authinfo structure. |
|
|
|
|
|
error return: |
|
- ENOTTY ai.type not recognized. |
|
|
|
|
|
|
|
CDROM_SEND_PACKET |
|
send a packet to the drive |
|
|
|
|
|
usage:: |
|
|
|
struct cdrom_generic_command cgc; |
|
|
|
ioctl(fd, CDROM_SEND_PACKET, &cgc); |
|
|
|
inputs: |
|
cdrom_generic_command structure containing the packet to send. |
|
|
|
|
|
outputs: |
|
none |
|
|
|
cdrom_generic_command structure containing results. |
|
|
|
error return: |
|
- EIO |
|
|
|
command failed. |
|
- EPERM |
|
|
|
Operation not permitted, either because a |
|
write command was attempted on a drive which |
|
is opened read-only, or because the command |
|
requires CAP_SYS_RAWIO |
|
- EINVAL |
|
|
|
cgc.data_direction not set |
|
|
|
|
|
|
|
CDROM_NEXT_WRITABLE |
|
get next writable block |
|
|
|
|
|
usage:: |
|
|
|
long next; |
|
|
|
ioctl(fd, CDROM_NEXT_WRITABLE, &next); |
|
|
|
inputs: |
|
none |
|
|
|
|
|
outputs: |
|
The next writable block. |
|
|
|
|
|
notes: |
|
If the device does not support this ioctl directly, the |
|
|
|
ioctl will return CDROM_LAST_WRITTEN + 7. |
|
|
|
|
|
|
|
CDROM_LAST_WRITTEN |
|
get last block written on disc |
|
|
|
|
|
usage:: |
|
|
|
long last; |
|
|
|
ioctl(fd, CDROM_LAST_WRITTEN, &last); |
|
|
|
inputs: |
|
none |
|
|
|
|
|
outputs: |
|
The last block written on disc |
|
|
|
|
|
notes: |
|
If the device does not support this ioctl directly, the |
|
result is derived from the disc's table of contents. If the |
|
table of contents can't be read, this ioctl returns an |
|
error.
|
|
|