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Diffstat (limited to 'package/makedevs')
| -rw-r--r-- | package/makedevs/README | 35 | 
1 files changed, 35 insertions, 0 deletions
diff --git a/package/makedevs/README b/package/makedevs/README new file mode 100644 index 000000000..6c54052ee --- /dev/null +++ b/package/makedevs/README @@ -0,0 +1,35 @@ +When building a target filesystem, it is desirable to not have to +become root and then run 'mknod' a thousand times.  Using a device +table you can create device nodes and directories "on the fly". + +You can do all sorts of interesting things with a device table file. +For example, if you want to adjust the permissions on a particular +file you can just add an entry like: + +  /sbin/foobar        f       2755    0       0       -       -       -       -       - + +and (assuming the file /sbin/foobar exists) it will be made setuid +root (regardless of what its permissions are on the host filesystem. + +Furthermore, you can use a single table entry to create a many device +minors.  For example, if I wanted to create /dev/hda and +/dev/hda[0-15] I could just use the following two table entries: + +  /dev/hda    b       640     0       0       3       0       0       0       - +  /dev/hda    b       640     0       0       3       1       1       1       15 + +Device table entries take the form of: + +<name>    <type>      <mode>  <uid>   <gid>   <major> <minor> <start> <inc>   <count> + +where name is the file name,  type can be one of: + +      f       A regular file +      d       Directory +      c       Character special device file +      b       Block special device file +      p       Fifo (named pipe) + +uid is the user id for the target file, gid is the group id for the +target file.  The rest of the entries (major, minor, etc) apply only +to device special files.  | 
