cddevsuppl - Sets and gets the major and minor numbers of a device file on a Rock Ridge format CD-ROM
/usr/sbin/cddevsuppl -m mapfile [-c]
/usr/sbin/cddevsuppl -u unmapfile [-c]
Directs cddevsuppl to continue processing the device file mappings if an error is returned for a specific device file mapping. An error message for that specific device file will be printed to standard error. The default action is to stop processing when an error has occurred. This option is useful only when used in combination with the -m mapfile or -u unmapfile options. Maps the major and minor numbers for device files. The mappings are specified in mapfile. This text file has one entry for each device file mapping in the format:
The cddevsuppl command is used to map and unmap the major and minor numbers of a device file on a mounted Rock Ridge format CD-ROM. The -m mapfile option maps the major and minor number of device files and displays the new setting, if the mapping is successful. This option is used to add new mappings or to change existing mappings, in case the major and minor numbers of the device files are incorrect.
The -u unmapfile option removes the existing mappings for files specified in unmapfile and displays the device file and the major/minor numbers as recorded on the CD-ROM.
If no options are used, the cddevsuppl command displays the existing device file mappings. If the mapping table is empty, nothing is displayed. Note: The mapping table is cleared after a mount or umount command.
If you want to open a device file on a CD-ROM, the dev option must be specified in the mount command. See mount(8) for more information.
Only the superuser can change administrative CD-ROM features successfully. To read the current device file mappings, the user must have read permission on the device file.
Mappings should be established before affected device files are used. If the command is applied for device file mappings when device files have already been opened, the effect of this command on these files is undefined.
Only existing devices files on the CD-ROM can be mapped. These files are indicated by the mode: b (block special file) or c (character special file). Use the ls -l command to display the file modes..
If you access device files on a CD-ROM that are mapped to inappropriate major and minor numbers, undefined results can occur.
The device file mappings for a mounted CD-ROM are eliminated when the CD-ROM is unmounted.
The following example shows the output of the cddevsuppl command when no CD-ROM is mounted and no files are mapped:
# cddevsuppl #
The following example shows the output of the cddevsuppl command after a CD-ROM file system has been mounted:
# /usr/sbin/mount -t cdfs -o noversion,rrip,dev /dev/rz4c /mnt # cddevsuppl #
The following example maps the major and minor numbers of files mounted in the previous example and specified in mapfile. Note: If you want, you can issue an ls -l command before and after the cddevsuppl command to verify that the major and minor numbers have changed.
# cddevsuppl -m /tmp/mapfile /mnt/dev/ttys4: (8,2050) /mnt/dev/zero: (38,0)
The following example unmaps the major and minor numbers of the file specified in unmapfile file and shows the result of the subsequent cddevsuppl command:
# cddevsuppl -u /tmp/unmapfile /mnt/dev/zero: (1,5) # cddevsuppl /mnt/dev/ttys4: (8,2050)
The following example unmounts the /mnt file system and shows the output of the subsequent cddevsuppl command:
# umount /mnt # cddevsuppl #
The following exit values are returned: Successful completion. File not found, file is not a file or directory within a CD-ROM file hierarchy, or access denied. Not user with appropriate privileges. Too many mappings. Parameter error or bad format in a mapping file. File is not a device file. File not previously mapped.
Functions: cd_setdevmap(3), cd_getdevmap(3) delim off