full - always full device
File /dev/full has major device number 1 and minor device number 7. Writes to the /dev/full device will fail with an ENOSPC error. Reads from the /dev/full device will return \0 characters. Seeks on /dev/full will always succeed.
If your system does not have /dev/full created already, it can be created with the following commands: mknod -m 666 /dev/full c 1 7 chown root.root /dev/full
mknod(1), null(4), zero(4)