#! /bin/sh

#-------------------------------------------------------------------------------
#   Remove all shared memory segments and semaphores belonging to the 
#   current non-root user (as determined by $USER) on a Linux system.
#
#   Irv.Elshoff@Deltares.NL
#   10 oct 96
#   22 sep 10
#
#   Copyright (C)  Stichting Deltares, 2011-2012.
#-------------------------------------------------------------------------------


if [ `uname` != "Linux" ]; then
    echo "$0 runs on Linux only"
    exit 1
fi

if [ "$USER" == "root" ]; then
    echo "$0 cannot be used by root; use ipcrm instead"
    exit 1
fi


awkstr="\$3 == \"$USER\" {print \$2}"

for id in `ipcs | awk "$awkstr"`; do    
    # We don't know whether awk found a shared memory segment or a semaphore,
    # but by attempting to delete both, at least one will succeed (and both
    # if the ID is the same for both SM and sem, which does happen).

    ipcrm -m $id > /dev/null 2>&1
    if [ $? -eq 0 ]; then
        echo "Removed shared memory segment $id"
    fi

    ipcrm -s $id > /dev/null 2>&1
    if [ $? -eq 0 ]; then
        echo "Removed semaphore $id"
    fi
done