I'm trying to work out how to set up a custom udev rule to override
permissions on serial ports (/dev/ttyS* and /dev/ttyUSB*) on CentOS 5.3
The default rule, in /etc/udev/rules.d/50-udev.rules has the line:
KERNEL=="tty[A-Z]*", NAME="%k", GROUP="uucp", MODE="0660"
and I would like the mode to be 0666
Various docs on web say that you shouldn't change 50-udev.rules, but
instead create a new rule file that appears lexically before that rule -
so I've created a file that contains the line:
KERNEL=="tty[A-Z]*", NAME="%k", GROUP="uucp", MODE="0666"
called 10-local.rules
However, this doesn't work ... the /dev/ttyS* device files get the
'default' owner/group/perms (mode = '0600', uid = '0', gid = '0')
If I rename the 10-local.rules to say 99-local.rules, then the device
files get the owner/group/perms from 50-udev.rules (mode = '0660', uid =
'0', gid = '14')
I can get the mode set to 0666 by editing 50-udev.rules, however this
seems wrong as you should be able to override the defaults without doing
this.
Anyone know if this is possible?
Thanks
James Pearson
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