org.handhelds.familiar/packages/initscripts/initscripts-1.0/urandom

   1 #! /bin/sh
   2 #
   3 # urandom       This script saves the random seed between reboots.
   4 #               It is called from the boot, halt and reboot scripts.
   5 #
   6 # Version:      @(#)urandom  1.33  22-Jun-1998  miquels@cistron.nl
   7 #
   8
   9 test -c /dev/urandom || exit 0
  10 . /etc/default/rcS
  11
  12 case "$1" in
  13         start|"")
  14                 test "$VERBOSE" != no && echo "Initializing random number generator..."
  15                 # Load and then save 512 bytes,
  16                 # which is the size of the entropy pool
  17                 if test -f /var/lib/urandom/random-seed
  18                 then
  19                         cat /var/lib/urandom/random-seed >/dev/urandom
  20                 fi
  21                 rm -f /var/lib/urandom/random-seed
  22                 umask 077
  23                 dd if=/dev/urandom of=/var/lib/urandom/random-seed count=1 \
  24                         >/dev/null 2>&1 || echo "urandom start: failed."
  25                 umask 022
  26                 ;;
  27         stop)
  28                 # Carry a random seed from shut-down to start-up;
  29                 # see documentation in linux/drivers/char/random.c
  30                 test "$VERBOSE" != no && echo "Saving random seed..."
  31                 umask 077
  32                 dd if=/dev/urandom of=/var/lib/urandom/random-seed count=1 \
  33                         >/dev/null 2>&1 || echo "urandom stop: failed."
  34                 ;;
  35         *)
  36                 echo "Usage: urandom {start|stop}" >&2
  37                 exit 1
  38                 ;;
  39 esac
  40
  41 exit 0