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view sources/toys/unique-port.sh @ 1187:878dbfe76341

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Move $BUILD/logs creation from record-commands.sh to include.sh so it gets reliably recreated when a user blanks the logs and re-runs.
author Rob Landley <rob@landley.net>
date Sun, 01 Aug 2010 15:19:00 -0500
parents 94b0b4ef1157
children 1cdd44f2bac2
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unique_port()
{
  # Try to find an unused port number for each running instance of the program.

  START=8192
  RANGE=$[$(awk '{print $1}' /proc/sys/net/ipv4/ip_local_port_range)-$START]
  if [ $RANGE -lt 1 ]
  then
    START=$[$(awk '{print $2}' /proc/sys/net/ipv4/ip_local_port_range)]
    RANGE=$[65535-$START]
  fi
  echo $[($$%$RANGE)+$START]
}