Documentation_ioctl_cdrom.txt
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Chinese translated version of Documentation_ioctl_cdrom
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Documentation_ioctl_cdrom的中文翻译
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以下为正文
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Summary of CDROM ioctl calls.
icotl调用CDROM的概要
============================
Edward A. Falk <efalk@google.com>
November, 2004
Edward A. Falk <efalk@google.com>
2014年11月
This document attempts to describe the ioctl(2) calls supported by
the CDROM layer. These are by-and-large implemented (as of Linux 2.6)
in drivers/cdrom/cdrom.c and drivers/block/scsi_ioctl.c
这个文档试图描述ioctl(2)调用受光盘层支持。总的来说这些在
drivers/cdrom/cdrom.c和drivers/block/scsi_ioctl.c中实施。
ioctl values are listed in <linux/cdrom.h>. As of this writing, they
are as follows:
ioctl值在<linux/cdrom.h>中列出。在撰写本文时,他们如下:
CDROMPAUSE Pause Audio Operation
CDROMRESUME Resume paused Audio Operation
CDROMPLAYMSF Play Audio MSF (struct cdrom_msf)
CDROMPLAYTRKIND Play Audio Track/index (struct cdrom_ti)
CDROMREADTOCHDR Read TOC header (struct cdrom_tochdr)
CDROMREADTOCENTRY Read TOC entry (struct cdrom_tocentry)
CDROMSTOP Stop the cdrom drive
CDROMSTART Start the cdrom drive
CDROMEJECT Ejects the cdrom media
CDROMVOLCTRL Control output volume (struct cdrom_volctrl)
CDROMSUBCHNL Read subchannel data (struct cdrom_subchnl)
CDROMREADMODE2 Read CDROM mode 2 data (2336 Bytes)
(struct cdrom_read)
CDROMREADMODE1 Read CDROM mode 1 data (2048 Bytes)
(struct cdrom_read)
CDROMREADAUDIO (struct cdrom_read_audio)
CDROMEJECT_SW enable(1)/disable(0) auto-ejecting
CDROMMULTISESSION Obtain the start-of-last-session
address of multi session disks
(struct cdrom_multisession)
CDROM_GET_MCN Obtain the "Universal Product Code"
if available (struct cdrom_mcn)
CDROM_GET_UPC Deprecated, use CDROM_GET_MCN instead.
CDROMRESET hard-reset the drive
CDROMVOLREAD Get the drive's volume setting
(struct cdrom_volctrl)
CDROMREADRAW read data in raw mode (2352 Bytes)
(struct cdrom_read)
CDROMREADCOOKED read data in cooked mode
CDROMSEEK seek msf address
CDROMPLAYBLK scsi-cd only, (struct cdrom_blk)
CDROMREADALL read all 2646 bytes
CDROMGETSPINDOWN return 4-bit spindown value
CDROMSETSPINDOWN set 4-bit spindown value
CDROMCLOSETRAY pendant of CDROMEJECT
CDROM_SET_OPTIONS Set behavior options
CDROM_CLEAR_OPTIONS Clear behavior options
CDROM_SELECT_SPEED Set the CD-ROM speed
CDROM_SELECT_DISC Select disc (for juke-boxes)
CDROM_MEDIA_CHANGED Check is media changed
CDROM_DRIVE_STATUS Get tray position, etc.
CDROM_DISC_STATUS Get disc type, etc.
CDROM_CHANGER_NSLOTS Get number of slots
CDROM_LOCKDOOR lock or unlock door
CDROM_DEBUG Turn debug messages on/off
CDROM_GET_CAPABILITY get capabilities
CDROMAUDIOBUFSIZ set the audio buffer size
DVD_READ_STRUCT Read structure
DVD_WRITE_STRUCT Write structure
DVD_AUTH Authentication
CDROM_SEND_PACKET send a packet to the drive
CDROM_NEXT_WRITABLE get next writable block
CDROM_LAST_WRITTEN get last block written on disc
cdrompause暂停音频操作
cdromresume恢复暂停音频操作
cdromplaymsf播放音频MSF(struct cdrom MSF)
cdromplaytrkind播放音频轨道/指数(struct cdrom ti)
cdromreadtochdr读TOC头(struct cdrom_tochdr)
cdromreadtocentry读TOC条目(struct cdrom_tocentry)
cdromstop停止光盘驱动
cdromstart启动光盘驱动
cdromeject弹出光盘媒体
cdromvolctrl控制输出音量(struct cdrom_volctrl)
cdromsubchnl读子通道数据(struct cdrom_subchnl)
cdromreadmode2读CDROM模式2的数据(2336字节)(struct cdrom_read)
cdromreadmode1读CDROM模式1的数据(2048字节)(struct cdrom_read)
cdromreadaudio(struct cdrom_read_audio)
cdromeject_sw启用(1)/禁用(0)自动弹出
cdrommultisession获得多会话磁盘启动的最后会话地址
(struct cdrom_multisession)
CDROM_GET_MCN获得有效的“UPC代码”（struct cdrom_mcn）
CDROM_GET_UPC已过时的使用CDROM_GET_MCN代替。
cdromreset硬重置驱动器
cdromvolread获得驱动器的音量设置(struct cdrom_volctrl)
cdromreadraw在原始模式读数据(2352字节)(struct cdrom_read)
cdromreadcooked熟模式取读数据
cdromseek寻求msf地址
cdromplayblk scsi cd,(struct cdrom_blk)
cdromreadall阅读所有2646个字节
cdromgetspindown返回4比特降速过程所需值
cdromsetspindown设置4比特降速过程所需值
cdromclosetray吊起的CDROMEJECT
CDROM_SET_OPTIONS设置行为选项
CDROM_CLEAR_OPTIONS清除行为选项
CDROM_SELECT_SPEED设置光盘速度
CDROM_SELECT_DISC选择盘(为自动点唱机)
CDROM_MEDIA_CHANGED检查媒体是否改变
CDROM_DRIVE_STATUS得到托盘的位置,等等。
CDROM_DISC_STATUS获得光盘类型，等等。
CDROM_CHANGER_NSLOTS获得插槽数
CDROM_LOCKDOOR锁定或解锁门
CDROM_DEBUG 调试消息转开/关
CDROM_GET_CAPABILITY获得能力
CDROMAUDIOBUFSIZ设置音频缓冲区大小
DVD_READ_STRUCT读结构
DVD_WRITE_STRUCT写结构
DVD_AUTH认证
CDROM_SEND_PACKET发送一个数据包到驱动器
CDROM_NEXT_WRITABLE得到下一个可写的块
CDROM_LAST_WRITTEN获得写入光盘上的最后一个数据块
The information that follows was determined from reading kernel source
code. It is likely that some corrections will be made over time.
从阅读内核源代码可以确定以下信息。但很可能随着时间的推移，将作出一些修正。
General:
一般来说：
Unless otherwise specified, all ioctl calls return 0 on success
and -1 with errno set to an appropriate value on error. (Some
ioctls return non-negative data values.)
除非另有说明，所有ioctl调用成功返回0，错误时返回-1或设置为一个适当值
的误差。（一些ioctl返回非负的数据值。）
Unless otherwise specified, all ioctl calls return -1 and set
errno to EFAULT on a failed attempt to copy data to or from user
address space.
同样，所有的ioctl调用返回-1和在失败时设置EFAULT试图去拷贝数据到或
从用户地址空间。
Individual drivers may return error codes not listed here.
个别驱动器可能返回的错误代码没有在这列出。
Unless otherwise specified, all data structures and constants
are defined in <linux/cdrom.h>
除非另有说明,所有的数据结构和常量定义在<linux/cdrom.h>
CDROMPAUSE Pause Audio Operation
usage:
ioctl(fd, CDROMPAUSE, 0);
inputs: none
outputs: none
error return:
ENOSYS cd drive not audio-capable.
CDROMPAUSE 暂停音频操作
用法：
ioctl(fd, CDROMPAUSE, 0);
输入：无
输出：无
出错返回：
ENOSYS 光盘驱动器没有音频功能。
CDROMRESUME Resume paused Audio Operation
usage:
ioctl(fd, CDROMRESUME, 0);
inputs: none
outputs: none
error return:
ENOSYS cd drive not audio-capable.
CDROMRESUME 恢复暂停音频操作
用法：
ioctl(fd, CDROMRESUME, 0);
输入：无
输出：无
出错返回：
ENOSYS 光盘驱动器没有音频功能。
CDROMPLAYMSF Play Audio MSF (struct cdrom_msf)
usage:
struct cdrom_msf msf;
ioctl(fd, CDROMPLAYMSF, &msf);
inputs:
cdrom_msf structure, describing a segment of music to play
outputs: none
error return:
ENOSYS cd drive not audio-capable.
notes:
MSF stands for minutes-seconds-frames
LBA stands for logical block address
Segment is described as start and end times, where each time
is described as minutes:seconds:frames. A frame is 1/75 of
a second.
CDROMPLAYMSF 播放音频MSF(struct cdrom_msf)
用法：
struct cdrom_msf msf;
ioctl(fd, CDROMPLAYMSF, &msf);
输入：
cdrom_msf structure, 描述一段音乐
输出：无
出错返回：
ENOSYS 光盘驱动器没有音频功能。
注释：
MSF表示分钟秒帧
LBA代表逻辑块地址
段描述为开始和结束时间，每一段用分：秒：帧来描述。一帧是
1/75秒。
CDROMPLAYTRKIND Play Audio Track/index (struct cdrom_ti)
usage:
struct cdrom_ti ti;
ioctl(fd, CDROMPLAYTRKIND, &ti);
inputs:
cdrom_ti structure, describing a segment of music to play
outputs: none
error return:
ENOSYS cd drive not audio-capable.
notes:
Segment is described as start and end times, where each time
is described as a track and an index.
CDROMPLAYTRKIND 播放音频轨道/指数 (struct cdrom_ti)
用法：
struct cdrom_ti ti;
ioctl(fd, CDROMPLAYTRKIND, &ti);
输入：
cdrom_ti structure, 描述一段音乐
输出：无
出错返回：
ENOSYS 光盘驱动器没有音频功能。
注释：
段描述为开始和结束时间，每一段用音频和轨道来描述。
CDROMREADTOCHDR Read TOC header (struct cdrom_tochdr)
usage:
cdrom_tochdr header;
ioctl(fd, CDROMREADTOCHDR, &header);
inputs:
cdrom_tochdr structure
outputs:
cdrom_tochdr structure
error return:
ENOSYS cd drive not audio-capable.
CDROMREADTOCHDR 读TOC头 (struct cdrom_tochdr)
用法：
cdrom_tochdr header;
ioctl(fd, CDROMREADTOCHDR, &header);
输入：
cdrom_tochdr structure
输出：
cdrom_tochdr structure
出错返回：
ENOSYS 光盘驱动器没有音频功能。
CDROMREADTOCENTRY Read TOC entry (struct cdrom_tocentry)
usage:
struct cdrom_tocentry entry;
ioctl(fd, CDROMREADTOCENTRY, &entry);
inputs:
cdrom_tocentry structure
outputs:
cdrom_tocentry structure
error return:
ENOSYS cd drive not audio-capable.
EINVAL entry.cdte_format not CDROM_MSF or CDROM_LBA
EINVAL requested track out of bounds
EIO I/O error reading TOC
notes:
TOC stands for Table Of Contents
MSF stands for minutes-seconds-frames
LBA stands for logical block address
CDROMREADTOCENTRY 读TOC条目 (struct cdrom_tocentry)
用法：
struct cdrom_tocentry entry;
ioctl(fd, CDROMREADTOCENTRY, &entry);
输入：
cdrom_tocentry结构
输出：
cdrom_tocentry结构
出错返回：
ENOSYS 光盘驱动器没有音频功能。
EINVAL entry.cdte_format不是CDROM_MSF或CDROM_LBA
EINVAL 请求越界
EIO I/O读取TOC出错
注释：
TOC 表示表的内容
MSF 表示分钟秒帧
LBA 代表逻辑块地址
CDROMSTOP Stop the cdrom drive
usage:
ioctl(fd, CDROMSTOP, 0);
inputs: none
outputs: none
error return:
ENOSYS cd drive not audio-capable.
notes:
Exact interpretation of this ioctl depends on the device,
but most seem to spin the drive down.
CDROMSTOP 停止的光盘驱动
用法：
ioctl(fd, CDROMSTOP, 0);
输入：无
输出：无
出错返回：
ENOSYS 光盘驱动器没有音频功能。
注释：
这个IOCTL确切的解释取决于设备，但大多数似乎自旋的降低。
CDROMSTART Start the cdrom drive
usage:
ioctl(fd, CDROMSTART, 0);
inputs: none
outputs: none
error return:
ENOSYS cd drive not audio-capable.
notes:
Exact interpretation of this ioctl depends on the device,
but most seem to spin the drive up and/or close the tray.
Other devices ignore the ioctl completely.
CDROMSTART 启动光盘驱动
用法：
ioctl(fd, CDROMSTART, 0);
输入：无
输出：无
出错返回：
ENOSYS 光盘驱动器没有音频能力。
注释：
确切的解释了ioctl取决于设备,但大多数人似乎在旋转驱动器上
和/或关闭托盘。其他设备完全忽略ioctl。
CDROMEJECT Ejects the cdrom media
usage:
ioctl(fd, CDROMEJECT, 0);
inputs: none
outputs: none
error returns:
ENOSYS cd drive not capable of ejecting
EBUSY other processes are accessing drive, or door is locked
notes:
See CDROM_LOCKDOOR, below.
CDROMEJECT 弹出光盘媒体
用法：
ioctl(fd, CDROMEJECT, 0);
输入：无
输出：无
出错返回：
ENOSYS 光盘驱动器不能排出
EBUSY 其他进程正在访问驱动器,或门是锁着的
注释：
详见下面的CDROM_LOCKDOOR。
CDROMCLOSETRAY pendant of CDROMEJECT
usage:
ioctl(fd, CDROMCLOSETRAY, 0);
inputs: none
outputs: none
error returns:
ENOSYS cd drive not capable of closing the tray
EBUSY other processes are accessing drive, or door is locked
notes:
See CDROM_LOCKDOOR, below.
CDROMCLOSETRAY 吊起的CDROMEJECT
用法：
ioctl(fd, CDROMCLOSETRAY, 0);
输入：无
输出：无
出错返回：
ENOSYS 光盘驱动器不能不能够关闭托盘
EBUSY 其他进程正在访问驱动器,或门是锁着的
注释：
详见下面的CDROM_LOCKDOOR。
CDROMVOLCTRL Control output volume (struct cdrom_volctrl)
usage:
struct cdrom_volctrl volume;
ioctl(fd, CDROMVOLCTRL, &volume);
inputs:
cdrom_volctrl structure containing volumes for up to 4
channels.
outputs: none
error return:
ENOSYS cd drive not audio-capable.
CDROMVOLCTRL 控制输出音量(struct cdrom_volctrl)
用法：
struct cdrom_volctrl volume;
ioctl(fd, CDROMVOLCTRL, &volume);
输入：
cdrom_volctrl结构的含量多达4个通道。
输出：无
出错返回：
ENOSYS 光盘驱动器没有音频能力。
CDROMVOLREAD Get the drive's volume setting
(struct cdrom_volctrl)
usage:
struct cdrom_volctrl volume;
ioctl(fd, CDROMVOLREAD, &volume);
inputs: none
outputs:
The current volume settings.
error return:
ENOSYS cd drive not audio-capable.
CDROMVOLREAD 获得驱动器的音量设置(struct cdrom_volctrl)
用法：
struct cdrom_volctrl volume;
ioctl(fd, CDROMVOLREAD, &volume);
输入：无
输出：
当前的音量设置。
出错返回：
ENOSYS 光盘驱动器没有音频能力。
CDROMSUBCHNL Read subchannel data (struct cdrom_subchnl)
usage:
struct cdrom_subchnl q;
ioctl(fd, CDROMSUBCHNL, &q);
inputs:
cdrom_subchnl structure
outputs:
cdrom_subchnl structure
error return:
ENOSYS cd drive not audio-capable.
EINVAL format not CDROM_MSF or CDROM_LBA
notes:
Format is converted to CDROM_MSF on return
CDROMSUBCHNL 读子通道数据(struct cdrom_subchnl)
用法：
struct cdrom_subchnl q;
ioctl(fd, CDROMSUBCHNL, &q);
输入：
cdrom_subchnl结构
输出：
cdrom_subchnl结构
出错返回：
ENOSYS 光盘驱动器没有音频能力。
EINVAL 格式不是CDROM_MSF或CDROM_LBA
注释:
在返回时格式要转换为CDROM_MSF
CDROMREADRAW read data in raw mode (2352 Bytes)
(struct cdrom_read)
usage:
union {
struct cdrom_msf msf; /* input */
char buffer[CD_FRAMESIZE_RAW]; /* return */
} arg;
ioctl(fd, CDROMREADRAW, &arg);
inputs:
cdrom_msf structure indicating an address to read.
Only the start values are significant.
outputs:
Data written to address provided by user.
error return:
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:
lba = (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET;
CDROMREADRAW 在原始模式读数据(2352字节)(struct cdrom_read)
用法：
union {
struct cdrom_msf msf; /* input */
char buffer[CD_FRAMESIZE_RAW]; /* return */
} arg;
ioctl(fd, CDROMREADRAW, &arg);
输入：
cdrom_msf结构显示一个用来读的地址。只有初始值时有意义。
输出：
由用户提供的写入该地址的数据。
出错返回：
EINVAL 小于0的地址，或小于0:2:0 MSF
ENOMEM 内存不足
注释：
自2.6.8.1起，<linux/cdrom.h>就表明这种ioctl接受一个cdrom_read结构,
但实际的源代码从相同的地址读取cdrom_msf结构和写缓冲区的数据。
MSF值通过这个公式转换为LBA值:
lba = (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET;
CDROMREADMODE1 Read CDROM mode 1 data (2048 Bytes)
(struct cdrom_read)
notes:
Identical to CDROMREADRAW except that block size is
CD_FRAMESIZE (2048) bytes
CDROMREADMODE1 读CDROM模式1的数据(2048字节)(struct cdrom_read)
注释：
与CDROMREADRAW相同,除了块大小是2048字节
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
CDROMREADMODE2 读CDROM模式2的数据(2336字节)(struct cdrom_read)
注释：
与CDROMREADRAW相同,除了块大小是2336字节
CDROMREADAUDIO (struct cdrom_read_audio)
usage:
struct cdrom_read_audio ra;
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
CDROMREADAUDIO (struct cdrom_read_audio)
用法：
struct cdrom_read_audio ra;
ioctl(fd, CDROMREADAUDIO, &ra);
输入：
cdrom_read_audio结构包含读的开始位置和读的长度
输出：
音频数据,返回缓冲区用ra显示
出错返回：
EINVAL 格式不是CDROM_MSF或CDROM_LBA
EINVAL nframes不在[1 75]范围内
ENXIO 驱动没有队列(可能意味着无效fd)
ENOMEM 内存不足
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
CDROMEJECT_SW 启用(1)/禁用(0)自动弹出
用法：
int val;
ioctl(fd, CDROMEJECT_SW, val);
输入：
指定自动弹出标志位。
输出: 无
出错返回：
ENOSYS 驱动是不能够弹出。
EBUSY 门是锁着的
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
CDROMMULTISESSION 获得多会话磁盘启动的最后会话地址
(struct cdrom_multisession)
用法：
struct cdrom_multisession ms_info;
ioctl(fd, CDROMMULTISESSION, &ms_info);
输入：
含有所需格式cdrom_multisession结构。
输出：
充满last_session信息的cdrom_multisession结构。
出错返回：
EINVAL 格式不是CDROM_MSF或CDROM_LBA
CDROM_GET_MCN Obtain the "Universal Product Code"
if available (struct cdrom_mcn)
usage:
struct cdrom_mcn mcn;
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_MCN 获得有效的“UPC代码”（struct cdrom_mcn）
用法：
struct cdrom_mcn mcn;
ioctl(fd, CDROM_GET_MCN, &mcn);
输入： 无
输出：
UPC代码
出错返回：
ENOSYS 驱动不能阅读MCN数据。
注释：
对源代码的评论情况:
下面的函数被实现，虽然很少有音频光盘给出应该在盒子上的媒体目
录数的UPC信息。注意，这种将代码写在CD上的方法在所有盘上市不
一样的。
CDROM_GET_UPC CDROM_GET_MCN (deprecated)
Not implemented, as of 2.6.8.1
cdrom_get_upc cdrom_get_mcn（不推荐使用）
截至2.6.8.1，没有实现
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.
CDROMRESET 硬重置驱动器
用法：
ioctl(fd, CDROMRESET, 0);
输入：无
输出：无
出错返回：
EACCES 拒绝访问:需要CAP_SYS_ADMIN
ENOSYS 驱动不可复位。
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.
CDROMREADCOOKED 熟模式取读数据
用法：
u8 buffer[CD_FRAMESIZE]
ioctl(fd, CDROMREADCOOKED, buffer);
输入：无
输出：
2048字节的数据，"cooked"模式。
注释：
所有驱动器上没有实现。
CDROMREADALL read all 2646 bytes
Same as CDROMREADCOOKED, but reads 2646 bytes.
CDROMREADALL 阅读所有2646个字节
与CDROMREADCOOKED相同，但读2646个字节。
CDROMSEEK seek msf address
usage:
struct cdrom_msf msf;
ioctl(fd, CDROMSEEK, &msf);
inputs:
MSF address to seek to.
outputs: none
CDROMSEEK 寻求msf地址
用法：
struct cdrom_msf msf;
ioctl(fd, CDROMSEEK, &msf);
输入：
要寻找的MSF地址。
输出：无
CDROMPLAYBLK scsi-cd only, (struct cdrom_blk)
usage:
struct cdrom_blk blk;
ioctl(fd, CDROMPLAYBLK, &blk);
inputs:
Region to play
outputs: none
CDROMPLAYBLK 只有scsi-cd, (struct cdrom_blk)
用法：
struct cdrom_blk blk;
ioctl(fd, CDROMPLAYBLK, &blk);
输入：
活动区域
输出：无
CDROMGETSPINDOWN
usage:
char spindown;
ioctl(fd, CDROMGETSPINDOWN, &spindown);
inputs: none
outputs:
The value of the current 4-bit spindown value.
CDROMGETSPINDOWN
用法：
char spindown;
ioctl(fd, CDROMGETSPINDOWN, &spindown);
输入：无
输出：
目前的4比特降速过程所需值。
CDROMSETSPINDOWN
usage:
char spindown
ioctl(fd, CDROMSETSPINDOWN, &spindown);
inputs:
4-bit value used to control spindown (TODO: more detail here)
outputs: none
CDROMSETSPINDOWN
用法：
char spindown
ioctl(fd, CDROMSETSPINDOWN, &spindown);
输入：
4比特用于控制下旋（待办事项：这里有更多详细）
输出： 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_SET_OPTIONS 设置行为选项
用法：
int options;
ioctl(fd, CDROM_SET_OPTIONS, options);
输入：
驱动器选择的新值。用逻辑“或”：
CDO_AUTO_CLOSE 关闭第一次打开的托盘（2）
CDO_AUTO_EJECT 打开最后释放的托盘
CDO_USE_FFLAGS 使用公开的o_nonblock信息
CDO_LOCK 打开的文件时锁住托盘
CDO_CHECK_TYPE 为开放的数据检查类型
输出：
在返回结果的选项设置ioctl返回值。出错时返回-1.
出错返回：
ENOSYS 选择选项不被驱动器支持。
CDROM_CLEAR_OPTIONS Clear behavior options
Same as CDROM_SET_OPTIONS, except that selected options are
turned off.
CDROM_CLEAR_OPTIONS 清除行为选项
与CDROM_SET_OPTIONS一样，除了选定的选项全都关闭。
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_SPEED 设置光盘速度
用法：
int speed;
ioctl(fd, CDROM_SELECT_SPEED, speed);
输入：
新的驱动速度。
输出：无
出错返回：
ENOSYS 速度选择不被驱动器支持。
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_SELECT_DISC 选择盘(为自动点唱机)
用法:
int disk;
ioctl(fd, CDROM_SELECT_DISC, disk);
输入:
磁盘加载到驱动器。
输出:无
出错返回：
EINVAL 磁盘数超出驱动的能力
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_MEDIA_CHANGED 检查媒体是否改变
用法:
int slot;
ioctl(fd, CDROM_MEDIA_CHANGED, slot);
输入:
对槽数进行测试，除点唱机总是零。也可能是特殊值CDSL_NONE或
CDSL_CURRENT
输出:
Ioctl返回值是0或1,取决于该媒体是否已经改变，或出现错误。
出错返回：
ENOSYS 驱动不能检测到媒体变化
EINVAL 槽数超出驱动的能力
ENOMEM 内存不足
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_DRIVE_STATUS 得到托盘的位置,等等。
用法:
int slot;
ioctl(fd, CDROM_DRIVE_STATUS, slot);
输入:
对槽数进行测试，除点唱机总是零。也可能是特殊值CDSL_NONE或
CDSL_CURRENT
输出:
Ioctl返回值将是在<linux/cdrom.h>中的下列值之一:
CDS_NO_INFO 信息不可用。
CDS_NO_DISC
CDS_TRAY_OPEN
CDS_DRIVE_NOT_READY
CDS_DISC_OK
-1 错误
出错返回：
ENOSYS 驱动器无法检测驱动器的状态
EINVAL 槽数超出驱动的能力
ENOMEM 内存不足
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_DISC_STATUS 获得光盘类型，等等。
用法：
ioctl(fd, CDROM_DISC_STATUS, 0);
输入： 无
输出：
ioctl返回值将是从<linux/cdrom.h>得到的下列值之一:
CDS_NO_INFO
CDS_AUDIO
CDS_MIXED
CDS_XA_2_2
CDS_XA_2_1
CDS_DATA_1
出错返回：目前没有
注释：
对源代码的评论情况：
好的，这是问题开始的地方。当前接口的CDROM_DISC_STATUS ioctl
是有缺陷的。它会产生假设CDs都是CDS_DATA_1或all CDS_AUDIO等错
误。不幸的是，虽然这是通常的情况下，CDs有一些数据轨道和
音频轨道也很常见。只是因为我喜欢这样，我宣布以下是最好的处理
方法。如果CD上有任何的数据轨道，它会作为一个CD数据返回。如果
CD上有任何的XA轨道，我会像那样返回它。现在我可以结合上述的返
回值简化这个接口，但这更清楚地表明当前的接口的问题。太糟糕了，
这不是有计划的使用位掩码... -Erik
好了，现在我们可以选择CDS_MIXED：混合型CD。用户级的程序员可能
觉得ioctl的不是很有用。
---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_CHANGER_NSLOTS 获得插槽数
用法：
ioctl(fd, CDROM_CHANGER_NSLOTS, 0);
输入：无
输出：
ioctl返回值将会是一个在CD交换机上是插槽数。典型地用1表示
非多磁盘设备。
出错返回： 无
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_LOCKDOOR 锁定或解锁门
使用：
int lock;
ioctl(fd, CDROM_LOCKDOOR, lock);
输入：
门锁标志，1=锁住，0=解锁
输出：无
出错返回：
EDRIVE_CANT_DO_THIS 门锁功能不支持。
EBUSY 当多个用户有驱动开放和无CAP_SYS_ADMIN的时尝试解锁
注释：
自2.6.8.1起，锁标志是一个全局性的锁这意味着所有的CD驱动器将
在一起锁定或解锁。这可能是一个bug.
EDRIVE_CANT_DO_THIS值在<linux/cdrom.h>中定义，目前（2.6.8.1）
与EOPNOTSUPP相同
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_DEBUG 调试消息转开/关
用法：
int debug;
ioctl(fd, CDROM_DEBUG, debug);
输入：
CDROM调试标志，0=禁用，1=启用
输出：
ioctl的返回值将是新的调试标志。
出错返回
EACCES 拒绝访问：需要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.
CDROM_GET_CAPABILITY 获得能力
用法：
ioctl(fd, CDROM_GET_CAPABILITY, 0);
输入：无
输出：
ioctl的返回值是当前设备的能力标志。见CDC_CLOSE_TRAY，
CDC_OPEN_TRAY等。
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.
CDROMAUDIOBUFSIZ 设置音频缓冲区大小
用法：
int arg;
ioctl(fd, CDROMAUDIOBUFSIZ, val);
输入：
新的音频缓冲区大小
输出：
ioctl的返回值是新的音频缓冲区大小，或-1或错误。
出错返回：
ENOSYS 此驱动程序不支持。
注释：
所有的驱动程序不支持。
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_READ_STRUCT 读结构
用法：
dvd_struct s;
ioctl(fd, DVD_READ_STRUCT, &s);
输入：
dvd_structt结构，内含：
类型 指定所需的信息，其中一个
DVD_STRUCT_PHYSICAL, DVD_STRUCT_COPYRIGHT,
DVD_STRUCT_DISCKEY, DVD_STRUCT_BCA,
DVD_STRUCT_MANUFACT
physical.layer_num 所需层，从0开始索引
copyright.layer_num 所需层，从0开始索引
disckey.agid
输出：
dvd_struct结构，内含：
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
出错返回：
EINVAL physical.layer_num超过层数
EIO 收到无效响应从驱动器
DVD_WRITE_STRUCT Write structure
Not implemented, as of 2.6.8.1
DVD_WRITE_STRUCT 写结构
截止2.6.8.1没有实现
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.
DVD_AUTH 认证
用法：
dvd_authinfo ai;
ioctl(fd, DVD_AUTH, &ai);
输入：
dvd_authinfo结构。 见<linux/cdrom.h>
输出：
dvd_authinfo结构。
出错返回：
ENOTTY ai.type不承认
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_SEND_PACKET 发送一个数据包到驱动器
用法：
struct cdrom_generic_command cgc;
ioctl(fd, CDROM_SEND_PACKET, &cgc);
输入：
包含有要发送数据包的cdrom_generic_command结构。
输出： 无
含有结果的cdrom_generic_command结构。
出错返回：
EIO 命令失败。
EPERM 操作不允许，要么是因为一在个只读方式打开的驱动
器上尝试写命令，或因为该命令需要CAP_SYS_RAWIO。
EINVAL cgc.data_direction没有设置
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_NEXT_WRITABLE 得到下一个可写的块
用法：
long next;
ioctl(fd, CDROM_NEXT_WRITABLE, &next);
输入： 无
输出：
下一个可写的块
注释：
如果设备不直接支持的ioctl，ioctl将返回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.
CDROM_LAST_WRITTEN 获得最后一个数据块写入光盘上
用法：
long last;
ioctl(fd, CDROM_LAST_WRITTEN, &last);
输入：无
输出：
写在光盘上的最后一个数据块
注释：
如果设备不直接支持的ioctl，结果是来自于光盘的表的内容。
如果表的内容不能被读取，这个IOCTL返回一个错误。
If you have any comment or update to the content, please contact the
original document maintainer directly. However, if you have a problem
communicating in English you can also ask the Chinese maintainer for
help. Contact the Chinese maintainer if this translation is outdated
or if there is a problem with the translation.
Chinese maintainer: <1538850747@qq.com>
---------------------------------------------------------------------
Documentation_ioctl_cdrom的中文翻译
如果想评论或更新本文的内容，请直接联系原文档的维护者。如果你使用英文
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译存在问题，请联系中文版维护者。
中文版维护者： 孙航海 <1538850747@qq.com>
中文版翻译者： 孙航海 <1538850747@qq.com>
中文版校译者： 孙航海 <1538850747@qq.com>
以下为正文
---------------------------------------------------------------------
Summary of CDROM ioctl calls.
icotl调用CDROM的概要
============================
Edward A. Falk <efalk@google.com>
November, 2004
Edward A. Falk <efalk@google.com>
2014年11月
This document attempts to describe the ioctl(2) calls supported by
the CDROM layer. These are by-and-large implemented (as of Linux 2.6)
in drivers/cdrom/cdrom.c and drivers/block/scsi_ioctl.c
这个文档试图描述ioctl(2)调用受光盘层支持。总的来说这些在
drivers/cdrom/cdrom.c和drivers/block/scsi_ioctl.c中实施。
ioctl values are listed in <linux/cdrom.h>. As of this writing, they
are as follows:
ioctl值在<linux/cdrom.h>中列出。在撰写本文时,他们如下:
CDROMPAUSE Pause Audio Operation
CDROMRESUME Resume paused Audio Operation
CDROMPLAYMSF Play Audio MSF (struct cdrom_msf)
CDROMPLAYTRKIND Play Audio Track/index (struct cdrom_ti)
CDROMREADTOCHDR Read TOC header (struct cdrom_tochdr)
CDROMREADTOCENTRY Read TOC entry (struct cdrom_tocentry)
CDROMSTOP Stop the cdrom drive
CDROMSTART Start the cdrom drive
CDROMEJECT Ejects the cdrom media
CDROMVOLCTRL Control output volume (struct cdrom_volctrl)
CDROMSUBCHNL Read subchannel data (struct cdrom_subchnl)
CDROMREADMODE2 Read CDROM mode 2 data (2336 Bytes)
(struct cdrom_read)
CDROMREADMODE1 Read CDROM mode 1 data (2048 Bytes)
(struct cdrom_read)
CDROMREADAUDIO (struct cdrom_read_audio)
CDROMEJECT_SW enable(1)/disable(0) auto-ejecting
CDROMMULTISESSION Obtain the start-of-last-session
address of multi session disks
(struct cdrom_multisession)
CDROM_GET_MCN Obtain the "Universal Product Code"
if available (struct cdrom_mcn)
CDROM_GET_UPC Deprecated, use CDROM_GET_MCN instead.
CDROMRESET hard-reset the drive
CDROMVOLREAD Get the drive's volume setting
(struct cdrom_volctrl)
CDROMREADRAW read data in raw mode (2352 Bytes)
(struct cdrom_read)
CDROMREADCOOKED read data in cooked mode
CDROMSEEK seek msf address
CDROMPLAYBLK scsi-cd only, (struct cdrom_blk)
CDROMREADALL read all 2646 bytes
CDROMGETSPINDOWN return 4-bit spindown value
CDROMSETSPINDOWN set 4-bit spindown value
CDROMCLOSETRAY pendant of CDROMEJECT
CDROM_SET_OPTIONS Set behavior options
CDROM_CLEAR_OPTIONS Clear behavior options
CDROM_SELECT_SPEED Set the CD-ROM speed
CDROM_SELECT_DISC Select disc (for juke-boxes)
CDROM_MEDIA_CHANGED Check is media changed
CDROM_DRIVE_STATUS Get tray position, etc.
CDROM_DISC_STATUS Get disc type, etc.
CDROM_CHANGER_NSLOTS Get number of slots
CDROM_LOCKDOOR lock or unlock door
CDROM_DEBUG Turn debug messages on/off
CDROM_GET_CAPABILITY get capabilities
CDROMAUDIOBUFSIZ set the audio buffer size
DVD_READ_STRUCT Read structure
DVD_WRITE_STRUCT Write structure
DVD_AUTH Authentication
CDROM_SEND_PACKET send a packet to the drive
CDROM_NEXT_WRITABLE get next writable block
CDROM_LAST_WRITTEN get last block written on disc
cdrompause暂停音频操作
cdromresume恢复暂停音频操作
cdromplaymsf播放音频MSF(struct cdrom MSF)
cdromplaytrkind播放音频轨道/指数(struct cdrom ti)
cdromreadtochdr读TOC头(struct cdrom_tochdr)
cdromreadtocentry读TOC条目(struct cdrom_tocentry)
cdromstop停止光盘驱动
cdromstart启动光盘驱动
cdromeject弹出光盘媒体
cdromvolctrl控制输出音量(struct cdrom_volctrl)
cdromsubchnl读子通道数据(struct cdrom_subchnl)
cdromreadmode2读CDROM模式2的数据(2336字节)(struct cdrom_read)
cdromreadmode1读CDROM模式1的数据(2048字节)(struct cdrom_read)
cdromreadaudio(struct cdrom_read_audio)
cdromeject_sw启用(1)/禁用(0)自动弹出
cdrommultisession获得多会话磁盘启动的最后会话地址
(struct cdrom_multisession)
CDROM_GET_MCN获得有效的“UPC代码”（struct cdrom_mcn）
CDROM_GET_UPC已过时的使用CDROM_GET_MCN代替。
cdromreset硬重置驱动器
cdromvolread获得驱动器的音量设置(struct cdrom_volctrl)
cdromreadraw在原始模式读数据(2352字节)(struct cdrom_read)
cdromreadcooked熟模式取读数据
cdromseek寻求msf地址
cdromplayblk scsi cd,(struct cdrom_blk)
cdromreadall阅读所有2646个字节
cdromgetspindown返回4比特降速过程所需值
cdromsetspindown设置4比特降速过程所需值
cdromclosetray吊起的CDROMEJECT
CDROM_SET_OPTIONS设置行为选项
CDROM_CLEAR_OPTIONS清除行为选项
CDROM_SELECT_SPEED设置光盘速度
CDROM_SELECT_DISC选择盘(为自动点唱机)
CDROM_MEDIA_CHANGED检查媒体是否改变
CDROM_DRIVE_STATUS得到托盘的位置,等等。
CDROM_DISC_STATUS获得光盘类型，等等。
CDROM_CHANGER_NSLOTS获得插槽数
CDROM_LOCKDOOR锁定或解锁门
CDROM_DEBUG 调试消息转开/关
CDROM_GET_CAPABILITY获得能力
CDROMAUDIOBUFSIZ设置音频缓冲区大小
DVD_READ_STRUCT读结构
DVD_WRITE_STRUCT写结构
DVD_AUTH认证
CDROM_SEND_PACKET发送一个数据包到驱动器
CDROM_NEXT_WRITABLE得到下一个可写的块
CDROM_LAST_WRITTEN获得写入光盘上的最后一个数据块
The information that follows was determined from reading kernel source
code. It is likely that some corrections will be made over time.
从阅读内核源代码可以确定以下信息。但很可能随着时间的推移，将作出一些修正。
General:
一般来说：
Unless otherwise specified, all ioctl calls return 0 on success
and -1 with errno set to an appropriate value on error. (Some
ioctls return non-negative data values.)
除非另有说明，所有ioctl调用成功返回0，错误时返回-1或设置为一个适当值
的误差。（一些ioctl返回非负的数据值。）
Unless otherwise specified, all ioctl calls return -1 and set
errno to EFAULT on a failed attempt to copy data to or from user
address space.
同样，所有的ioctl调用返回-1和在失败时设置EFAULT试图去拷贝数据到或
从用户地址空间。
Individual drivers may return error codes not listed here.
个别驱动器可能返回的错误代码没有在这列出。
Unless otherwise specified, all data structures and constants
are defined in <linux/cdrom.h>
除非另有说明,所有的数据结构和常量定义在<linux/cdrom.h>
CDROMPAUSE Pause Audio Operation
usage:
ioctl(fd, CDROMPAUSE, 0);
inputs: none
outputs: none
error return:
ENOSYS cd drive not audio-capable.
CDROMPAUSE 暂停音频操作
用法：
ioctl(fd, CDROMPAUSE, 0);
输入：无
输出：无
出错返回：
ENOSYS 光盘驱动器没有音频功能。
CDROMRESUME Resume paused Audio Operation
usage:
ioctl(fd, CDROMRESUME, 0);
inputs: none
outputs: none
error return:
ENOSYS cd drive not audio-capable.
CDROMRESUME 恢复暂停音频操作
用法：
ioctl(fd, CDROMRESUME, 0);
输入：无
输出：无
出错返回：
ENOSYS 光盘驱动器没有音频功能。
CDROMPLAYMSF Play Audio MSF (struct cdrom_msf)
usage:
struct cdrom_msf msf;
ioctl(fd, CDROMPLAYMSF, &msf);
inputs:
cdrom_msf structure, describing a segment of music to play
outputs: none
error return:
ENOSYS cd drive not audio-capable.
notes:
MSF stands for minutes-seconds-frames
LBA stands for logical block address
Segment is described as start and end times, where each time
is described as minutes:seconds:frames. A frame is 1/75 of
a second.
CDROMPLAYMSF 播放音频MSF(struct cdrom_msf)
用法：
struct cdrom_msf msf;
ioctl(fd, CDROMPLAYMSF, &msf);
输入：
cdrom_msf structure, 描述一段音乐
输出：无
出错返回：
ENOSYS 光盘驱动器没有音频功能。
注释：
MSF表示分钟秒帧
LBA代表逻辑块地址
段描述为开始和结束时间，每一段用分：秒：帧来描述。一帧是
1/75秒。
CDROMPLAYTRKIND Play Audio Track/index (struct cdrom_ti)
usage:
struct cdrom_ti ti;
ioctl(fd, CDROMPLAYTRKIND, &ti);
inputs:
cdrom_ti structure, describing a segment of music to play
outputs: none
error return:
ENOSYS cd drive not audio-capable.
notes:
Segment is described as start and end times, where each time
is described as a track and an index.
CDROMPLAYTRKIND 播放音频轨道/指数 (struct cdrom_ti)
用法：
struct cdrom_ti ti;
ioctl(fd, CDROMPLAYTRKIND, &ti);
输入：
cdrom_ti structure, 描述一段音乐
输出：无
出错返回：
ENOSYS 光盘驱动器没有音频功能。
注释：
段描述为开始和结束时间，每一段用音频和轨道来描述。
CDROMREADTOCHDR Read TOC header (struct cdrom_tochdr)
usage:
cdrom_tochdr header;
ioctl(fd, CDROMREADTOCHDR, &header);
inputs:
cdrom_tochdr structure
outputs:
cdrom_tochdr structure
error return:
ENOSYS cd drive not audio-capable.
CDROMREADTOCHDR 读TOC头 (struct cdrom_tochdr)
用法：
cdrom_tochdr header;
ioctl(fd, CDROMREADTOCHDR, &header);
输入：
cdrom_tochdr structure
输出：
cdrom_tochdr structure
出错返回：
ENOSYS 光盘驱动器没有音频功能。
CDROMREADTOCENTRY Read TOC entry (struct cdrom_tocentry)
usage:
struct cdrom_tocentry entry;
ioctl(fd, CDROMREADTOCENTRY, &entry);
inputs:
cdrom_tocentry structure
outputs:
cdrom_tocentry structure
error return:
ENOSYS cd drive not audio-capable.
EINVAL entry.cdte_format not CDROM_MSF or CDROM_LBA
EINVAL requested track out of bounds
EIO I/O error reading TOC
notes:
TOC stands for Table Of Contents
MSF stands for minutes-seconds-frames
LBA stands for logical block address
CDROMREADTOCENTRY 读TOC条目 (struct cdrom_tocentry)
用法：
struct cdrom_tocentry entry;
ioctl(fd, CDROMREADTOCENTRY, &entry);
输入：
cdrom_tocentry结构
输出：
cdrom_tocentry结构
出错返回：
ENOSYS 光盘驱动器没有音频功能。
EINVAL entry.cdte_format不是CDROM_MSF或CDROM_LBA
EINVAL 请求越界
EIO I/O读取TOC出错
注释：
TOC 表示表的内容
MSF 表示分钟秒帧
LBA 代表逻辑块地址
CDROMSTOP Stop the cdrom drive
usage:
ioctl(fd, CDROMSTOP, 0);
inputs: none
outputs: none
error return:
ENOSYS cd drive not audio-capable.
notes:
Exact interpretation of this ioctl depends on the device,
but most seem to spin the drive down.
CDROMSTOP 停止的光盘驱动
用法：
ioctl(fd, CDROMSTOP, 0);
输入：无
输出：无
出错返回：
ENOSYS 光盘驱动器没有音频功能。
注释：
这个IOCTL确切的解释取决于设备，但大多数似乎自旋的降低。
CDROMSTART Start the cdrom drive
usage:
ioctl(fd, CDROMSTART, 0);
inputs: none
outputs: none
error return:
ENOSYS cd drive not audio-capable.
notes:
Exact interpretation of this ioctl depends on the device,
but most seem to spin the drive up and/or close the tray.
Other devices ignore the ioctl completely.
CDROMSTART 启动光盘驱动
用法：
ioctl(fd, CDROMSTART, 0);
输入：无
输出：无
出错返回：
ENOSYS 光盘驱动器没有音频能力。
注释：
确切的解释了ioctl取决于设备,但大多数人似乎在旋转驱动器上
和/或关闭托盘。其他设备完全忽略ioctl。
CDROMEJECT Ejects the cdrom media
usage:
ioctl(fd, CDROMEJECT, 0);
inputs: none
outputs: none
error returns:
ENOSYS cd drive not capable of ejecting
EBUSY other processes are accessing drive, or door is locked
notes:
See CDROM_LOCKDOOR, below.
CDROMEJECT 弹出光盘媒体
用法：
ioctl(fd, CDROMEJECT, 0);
输入：无
输出：无
出错返回：
ENOSYS 光盘驱动器不能排出
EBUSY 其他进程正在访问驱动器,或门是锁着的
注释：
详见下面的CDROM_LOCKDOOR。
CDROMCLOSETRAY pendant of CDROMEJECT
usage:
ioctl(fd, CDROMCLOSETRAY, 0);
inputs: none
outputs: none
error returns:
ENOSYS cd drive not capable of closing the tray
EBUSY other processes are accessing drive, or door is locked
notes:
See CDROM_LOCKDOOR, below.
CDROMCLOSETRAY 吊起的CDROMEJECT
用法：
ioctl(fd, CDROMCLOSETRAY, 0);
输入：无
输出：无
出错返回：
ENOSYS 光盘驱动器不能不能够关闭托盘
EBUSY 其他进程正在访问驱动器,或门是锁着的
注释：
详见下面的CDROM_LOCKDOOR。
CDROMVOLCTRL Control output volume (struct cdrom_volctrl)
usage:
struct cdrom_volctrl volume;
ioctl(fd, CDROMVOLCTRL, &volume);
inputs:
cdrom_volctrl structure containing volumes for up to 4
channels.
outputs: none
error return:
ENOSYS cd drive not audio-capable.
CDROMVOLCTRL 控制输出音量(struct cdrom_volctrl)
用法：
struct cdrom_volctrl volume;
ioctl(fd, CDROMVOLCTRL, &volume);
输入：
cdrom_volctrl结构的含量多达4个通道。
输出：无
出错返回：
ENOSYS 光盘驱动器没有音频能力。
CDROMVOLREAD Get the drive's volume setting
(struct cdrom_volctrl)
usage:
struct cdrom_volctrl volume;
ioctl(fd, CDROMVOLREAD, &volume);
inputs: none
outputs:
The current volume settings.
error return:
ENOSYS cd drive not audio-capable.
CDROMVOLREAD 获得驱动器的音量设置(struct cdrom_volctrl)
用法：
struct cdrom_volctrl volume;
ioctl(fd, CDROMVOLREAD, &volume);
输入：无
输出：
当前的音量设置。
出错返回：
ENOSYS 光盘驱动器没有音频能力。
CDROMSUBCHNL Read subchannel data (struct cdrom_subchnl)
usage:
struct cdrom_subchnl q;
ioctl(fd, CDROMSUBCHNL, &q);
inputs:
cdrom_subchnl structure
outputs:
cdrom_subchnl structure
error return:
ENOSYS cd drive not audio-capable.
EINVAL format not CDROM_MSF or CDROM_LBA
notes:
Format is converted to CDROM_MSF on return
CDROMSUBCHNL 读子通道数据(struct cdrom_subchnl)
用法：
struct cdrom_subchnl q;
ioctl(fd, CDROMSUBCHNL, &q);
输入：
cdrom_subchnl结构
输出：
cdrom_subchnl结构
出错返回：
ENOSYS 光盘驱动器没有音频能力。
EINVAL 格式不是CDROM_MSF或CDROM_LBA
注释:
在返回时格式要转换为CDROM_MSF
CDROMREADRAW read data in raw mode (2352 Bytes)
(struct cdrom_read)
usage:
union {
struct cdrom_msf msf; /* input */
char buffer[CD_FRAMESIZE_RAW]; /* return */
} arg;
ioctl(fd, CDROMREADRAW, &arg);
inputs:
cdrom_msf structure indicating an address to read.
Only the start values are significant.
outputs:
Data written to address provided by user.
error return:
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:
lba = (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET;
CDROMREADRAW 在原始模式读数据(2352字节)(struct cdrom_read)
用法：
union {
struct cdrom_msf msf; /* input */
char buffer[CD_FRAMESIZE_RAW]; /* return */
} arg;
ioctl(fd, CDROMREADRAW, &arg);
输入：
cdrom_msf结构显示一个用来读的地址。只有初始值时有意义。
输出：
由用户提供的写入该地址的数据。
出错返回：
EINVAL 小于0的地址，或小于0:2:0 MSF
ENOMEM 内存不足
注释：
自2.6.8.1起，<linux/cdrom.h>就表明这种ioctl接受一个cdrom_read结构,
但实际的源代码从相同的地址读取cdrom_msf结构和写缓冲区的数据。
MSF值通过这个公式转换为LBA值:
lba = (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET;
CDROMREADMODE1 Read CDROM mode 1 data (2048 Bytes)
(struct cdrom_read)
notes:
Identical to CDROMREADRAW except that block size is
CD_FRAMESIZE (2048) bytes
CDROMREADMODE1 读CDROM模式1的数据(2048字节)(struct cdrom_read)
注释：
与CDROMREADRAW相同,除了块大小是2048字节
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
CDROMREADMODE2 读CDROM模式2的数据(2336字节)(struct cdrom_read)
注释：
与CDROMREADRAW相同,除了块大小是2336字节
CDROMREADAUDIO (struct cdrom_read_audio)
usage:
struct cdrom_read_audio ra;
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
CDROMREADAUDIO (struct cdrom_read_audio)
用法：
struct cdrom_read_audio ra;
ioctl(fd, CDROMREADAUDIO, &ra);
输入：
cdrom_read_audio结构包含读的开始位置和读的长度
输出：
音频数据,返回缓冲区用ra显示
出错返回：
EINVAL 格式不是CDROM_MSF或CDROM_LBA
EINVAL nframes不在[1 75]范围内
ENXIO 驱动没有队列(可能意味着无效fd)
ENOMEM 内存不足
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
CDROMEJECT_SW 启用(1)/禁用(0)自动弹出
用法：
int val;
ioctl(fd, CDROMEJECT_SW, val);
输入：
指定自动弹出标志位。
输出: 无
出错返回：
ENOSYS 驱动是不能够弹出。
EBUSY 门是锁着的
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
CDROMMULTISESSION 获得多会话磁盘启动的最后会话地址
(struct cdrom_multisession)
用法：
struct cdrom_multisession ms_info;
ioctl(fd, CDROMMULTISESSION, &ms_info);
输入：
含有所需格式cdrom_multisession结构。
输出：
充满last_session信息的cdrom_multisession结构。
出错返回：
EINVAL 格式不是CDROM_MSF或CDROM_LBA
CDROM_GET_MCN Obtain the "Universal Product Code"
if available (struct cdrom_mcn)
usage:
struct cdrom_mcn mcn;
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_MCN 获得有效的“UPC代码”（struct cdrom_mcn）
用法：
struct cdrom_mcn mcn;
ioctl(fd, CDROM_GET_MCN, &mcn);
输入： 无
输出：
UPC代码
出错返回：
ENOSYS 驱动不能阅读MCN数据。
注释：
对源代码的评论情况:
下面的函数被实现，虽然很少有音频光盘给出应该在盒子上的媒体目
录数的UPC信息。注意，这种将代码写在CD上的方法在所有盘上市不
一样的。
CDROM_GET_UPC CDROM_GET_MCN (deprecated)
Not implemented, as of 2.6.8.1
cdrom_get_upc cdrom_get_mcn（不推荐使用）
截至2.6.8.1，没有实现
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.
CDROMRESET 硬重置驱动器
用法：
ioctl(fd, CDROMRESET, 0);
输入：无
输出：无
出错返回：
EACCES 拒绝访问:需要CAP_SYS_ADMIN
ENOSYS 驱动不可复位。
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.
CDROMREADCOOKED 熟模式取读数据
用法：
u8 buffer[CD_FRAMESIZE]
ioctl(fd, CDROMREADCOOKED, buffer);
输入：无
输出：
2048字节的数据，"cooked"模式。
注释：
所有驱动器上没有实现。
CDROMREADALL read all 2646 bytes
Same as CDROMREADCOOKED, but reads 2646 bytes.
CDROMREADALL 阅读所有2646个字节
与CDROMREADCOOKED相同，但读2646个字节。
CDROMSEEK seek msf address
usage:
struct cdrom_msf msf;
ioctl(fd, CDROMSEEK, &msf);
inputs:
MSF address to seek to.
outputs: none
CDROMSEEK 寻求msf地址
用法：
struct cdrom_msf msf;
ioctl(fd, CDROMSEEK, &msf);
输入：
要寻找的MSF地址。
输出：无
CDROMPLAYBLK scsi-cd only, (struct cdrom_blk)
usage:
struct cdrom_blk blk;
ioctl(fd, CDROMPLAYBLK, &blk);
inputs:
Region to play
outputs: none
CDROMPLAYBLK 只有scsi-cd, (struct cdrom_blk)
用法：
struct cdrom_blk blk;
ioctl(fd, CDROMPLAYBLK, &blk);
输入：
活动区域
输出：无
CDROMGETSPINDOWN
usage:
char spindown;
ioctl(fd, CDROMGETSPINDOWN, &spindown);
inputs: none
outputs:
The value of the current 4-bit spindown value.
CDROMGETSPINDOWN
用法：
char spindown;
ioctl(fd, CDROMGETSPINDOWN, &spindown);
输入：无
输出：
目前的4比特降速过程所需值。
CDROMSETSPINDOWN
usage:
char spindown
ioctl(fd, CDROMSETSPINDOWN, &spindown);
inputs:
4-bit value used to control spindown (TODO: more detail here)
outputs: none
CDROMSETSPINDOWN
用法：
char spindown
ioctl(fd, CDROMSETSPINDOWN, &spindown);
输入：
4比特用于控制下旋（待办事项：这里有更多详细）
输出： 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_SET_OPTIONS 设置行为选项
用法：
int options;
ioctl(fd, CDROM_SET_OPTIONS, options);
输入：
驱动器选择的新值。用逻辑“或”：
CDO_AUTO_CLOSE 关闭第一次打开的托盘（2）
CDO_AUTO_EJECT 打开最后释放的托盘
CDO_USE_FFLAGS 使用公开的o_nonblock信息
CDO_LOCK 打开的文件时锁住托盘
CDO_CHECK_TYPE 为开放的数据检查类型
输出：
在返回结果的选项设置ioctl返回值。出错时返回-1.
出错返回：
ENOSYS 选择选项不被驱动器支持。
CDROM_CLEAR_OPTIONS Clear behavior options
Same as CDROM_SET_OPTIONS, except that selected options are
turned off.
CDROM_CLEAR_OPTIONS 清除行为选项
与CDROM_SET_OPTIONS一样，除了选定的选项全都关闭。
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_SPEED 设置光盘速度
用法：
int speed;
ioctl(fd, CDROM_SELECT_SPEED, speed);
输入：
新的驱动速度。
输出：无
出错返回：
ENOSYS 速度选择不被驱动器支持。
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_SELECT_DISC 选择盘(为自动点唱机)
用法:
int disk;
ioctl(fd, CDROM_SELECT_DISC, disk);
输入:
磁盘加载到驱动器。
输出:无
出错返回：
EINVAL 磁盘数超出驱动的能力
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_MEDIA_CHANGED 检查媒体是否改变
用法:
int slot;
ioctl(fd, CDROM_MEDIA_CHANGED, slot);
输入:
对槽数进行测试，除点唱机总是零。也可能是特殊值CDSL_NONE或
CDSL_CURRENT
输出:
Ioctl返回值是0或1,取决于该媒体是否已经改变，或出现错误。
出错返回：
ENOSYS 驱动不能检测到媒体变化
EINVAL 槽数超出驱动的能力
ENOMEM 内存不足
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_DRIVE_STATUS 得到托盘的位置,等等。
用法:
int slot;
ioctl(fd, CDROM_DRIVE_STATUS, slot);
输入:
对槽数进行测试，除点唱机总是零。也可能是特殊值CDSL_NONE或
CDSL_CURRENT
输出:
Ioctl返回值将是在<linux/cdrom.h>中的下列值之一:
CDS_NO_INFO 信息不可用。
CDS_NO_DISC
CDS_TRAY_OPEN
CDS_DRIVE_NOT_READY
CDS_DISC_OK
-1 错误
出错返回：
ENOSYS 驱动器无法检测驱动器的状态
EINVAL 槽数超出驱动的能力
ENOMEM 内存不足
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_DISC_STATUS 获得光盘类型，等等。
用法：
ioctl(fd, CDROM_DISC_STATUS, 0);
输入： 无
输出：
ioctl返回值将是从<linux/cdrom.h>得到的下列值之一:
CDS_NO_INFO
CDS_AUDIO
CDS_MIXED
CDS_XA_2_2
CDS_XA_2_1
CDS_DATA_1
出错返回：目前没有
注释：
对源代码的评论情况：
好的，这是问题开始的地方。当前接口的CDROM_DISC_STATUS ioctl
是有缺陷的。它会产生假设CDs都是CDS_DATA_1或all CDS_AUDIO等错
误。不幸的是，虽然这是通常的情况下，CDs有一些数据轨道和
音频轨道也很常见。只是因为我喜欢这样，我宣布以下是最好的处理
方法。如果CD上有任何的数据轨道，它会作为一个CD数据返回。如果
CD上有任何的XA轨道，我会像那样返回它。现在我可以结合上述的返
回值简化这个接口，但这更清楚地表明当前的接口的问题。太糟糕了，
这不是有计划的使用位掩码... -Erik
好了，现在我们可以选择CDS_MIXED：混合型CD。用户级的程序员可能
觉得ioctl的不是很有用。
---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_CHANGER_NSLOTS 获得插槽数
用法：
ioctl(fd, CDROM_CHANGER_NSLOTS, 0);
输入：无
输出：
ioctl返回值将会是一个在CD交换机上是插槽数。典型地用1表示
非多磁盘设备。
出错返回： 无
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_LOCKDOOR 锁定或解锁门
使用：
int lock;
ioctl(fd, CDROM_LOCKDOOR, lock);
输入：
门锁标志，1=锁住，0=解锁
输出：无
出错返回：
EDRIVE_CANT_DO_THIS 门锁功能不支持。
EBUSY 当多个用户有驱动开放和无CAP_SYS_ADMIN的时尝试解锁
注释：
自2.6.8.1起，锁标志是一个全局性的锁这意味着所有的CD驱动器将
在一起锁定或解锁。这可能是一个bug.
EDRIVE_CANT_DO_THIS值在<linux/cdrom.h>中定义，目前（2.6.8.1）
与EOPNOTSUPP相同
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_DEBUG 调试消息转开/关
用法：
int debug;
ioctl(fd, CDROM_DEBUG, debug);
输入：
CDROM调试标志，0=禁用，1=启用
输出：
ioctl的返回值将是新的调试标志。
出错返回
EACCES 拒绝访问：需要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.
CDROM_GET_CAPABILITY 获得能力
用法：
ioctl(fd, CDROM_GET_CAPABILITY, 0);
输入：无
输出：
ioctl的返回值是当前设备的能力标志。见CDC_CLOSE_TRAY，
CDC_OPEN_TRAY等。
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.
CDROMAUDIOBUFSIZ 设置音频缓冲区大小
用法：
int arg;
ioctl(fd, CDROMAUDIOBUFSIZ, val);
输入：
新的音频缓冲区大小
输出：
ioctl的返回值是新的音频缓冲区大小，或-1或错误。
出错返回：
ENOSYS 此驱动程序不支持。
注释：
所有的驱动程序不支持。
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_READ_STRUCT 读结构
用法：
dvd_struct s;
ioctl(fd, DVD_READ_STRUCT, &s);
输入：
dvd_structt结构，内含：
类型 指定所需的信息，其中一个
DVD_STRUCT_PHYSICAL, DVD_STRUCT_COPYRIGHT,
DVD_STRUCT_DISCKEY, DVD_STRUCT_BCA,
DVD_STRUCT_MANUFACT
physical.layer_num 所需层，从0开始索引
copyright.layer_num 所需层，从0开始索引
disckey.agid
输出：
dvd_struct结构，内含：
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
出错返回：
EINVAL physical.layer_num超过层数
EIO 收到无效响应从驱动器
DVD_WRITE_STRUCT Write structure
Not implemented, as of 2.6.8.1
DVD_WRITE_STRUCT 写结构
截止2.6.8.1没有实现
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.
DVD_AUTH 认证
用法：
dvd_authinfo ai;
ioctl(fd, DVD_AUTH, &ai);
输入：
dvd_authinfo结构。 见<linux/cdrom.h>
输出：
dvd_authinfo结构。
出错返回：
ENOTTY ai.type不承认
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_SEND_PACKET 发送一个数据包到驱动器
用法：
struct cdrom_generic_command cgc;
ioctl(fd, CDROM_SEND_PACKET, &cgc);
输入：
包含有要发送数据包的cdrom_generic_command结构。
输出： 无
含有结果的cdrom_generic_command结构。
出错返回：
EIO 命令失败。
EPERM 操作不允许，要么是因为一在个只读方式打开的驱动
器上尝试写命令，或因为该命令需要CAP_SYS_RAWIO。
EINVAL cgc.data_direction没有设置
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_NEXT_WRITABLE 得到下一个可写的块
用法：
long next;
ioctl(fd, CDROM_NEXT_WRITABLE, &next);
输入： 无
输出：
下一个可写的块
注释：
如果设备不直接支持的ioctl，ioctl将返回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.
CDROM_LAST_WRITTEN 获得最后一个数据块写入光盘上
用法：
long last;
ioctl(fd, CDROM_LAST_WRITTEN, &last);
输入：无
输出：
写在光盘上的最后一个数据块
注释：
如果设备不直接支持的ioctl，结果是来自于光盘的表的内容。
如果表的内容不能被读取，这个IOCTL返回一个错误。
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