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#!/sbin/runscript
# Copyright 1999-2007 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
URANDOM_SEED=${URANDOM_SEED:-/var/run/random-seed}
depend() {
need localmount
}
save_seed() {
local poolsize=1
if [ -e /proc/sys/kernel/random/poolsize ] ; then
poolsize=$(($(cat /proc/sys/kernel/random/poolsize) / 4096))
fi
( # sub shell to prevent umask pollution
umask 077
dd if=/dev/urandom of="${URANDOM_SEED}" count=${poolsize} 2>/dev/null
)
}
start() {
[ -c /dev/urandom ] || return
if [ -f "${URANDOM_SEED}" ] ; then
cat "${URANDOM_SEED}" > /dev/urandom
fi
if ! rm -f "${URANDOM_SEED}" ; then
ewarn "Skipping ${URANDOM_SEED} initialization (ro root?)"
return 0
fi
ebegin "Initializing random number generator"
save_seed
eend $? "Error initializing random number generator"
}
stop() {
ebegin "Saving random seed"
# Carry a random seed from shut-down to start-up;
# see documentation in linux/drivers/char/random.c
save_seed
eend $? "Failed to save random seed"
}
# vim: set ts=4 :
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