/etc/minor_perm File

drvconfig reads the /etc/minor_perm file to obtain permission information and applies the permissions only to nodes that it has just created. It does not change permissions on already existing nodes. The format of the /etc/minor_perm file is as follows:

name:minor_name permissions owner group

minor_name may be the actual name of the minor node, or contain shell metacharacters to represent several minor nodes (see sh(1)).

For example:

sd:* 0640 root sys
zs:[a-z],cu 0600 uucp uucp
mm:kmem 0640 root bin

The first line sets all devices exported by the sd node to 0640 permissions, owned by root, with group sys. In the second line, devices such as a,cu and z,cu exported by the zs driver are set to 0600 permission, owned by uucp, with group uucp. In the third line the kmem device exported by the mm driver is set to 0640 permission, owned by root, with group bin.

$  ll /dev/tty2*
crw--w--w-   1 bin        bin         79 0x020000 Jan 22 16:05 /dev/tty2a1
crw--w--w-   1 bin        bin         79 0x020100 Aug  6  2002 /dev/tty2a2
crw--w--w-   1 bin        bin         79 0x020200 Aug  6  2002 /dev/tty2a3
crw--w--w-   1 bin        bin         79 0x020300 Aug  6  2002 /dev/tty2a4
...