Md wrote:
> SuSE uses some scripts to handle persistent interface names
> [...] I had no time yet to investigate the details.
I just looked at the "rename_netiface" script in that package. The
following comments in the script give an idea of how it handles the
race problem.
# look for a network interface name that is still not
# used as persistent name. At first it tries the name the
# interface currently has. If this name is already occupied,
# then increase the number and try again.
# To check if a name is occupied we have to look in
# /etc/udev/rules.d/60-net_*.rules and in /tmp/used_interface_names*.
# The latter serves as temporary registration file to avoid race
# conditions. It will be removed when the script exits.
# Simply try to rename directly, because it will work in most cases
# Generate a temporary interface name
# Rename it to the temporary name.
# Then try several times to rename it to new name
Now "trying several times", etc., may work, but it's a kludge. There are
sound ways of resolving contention for a shared resource.
--
Thomas Hood
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