#!/bin/bash
# BEGIN_ICS_COPYRIGHT8 ****************************************
# 
# Copyright (c) 2022, Intel Corporation
# 
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# modification, are permitted provided that the following conditions are met:
# 
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# [ICS VERSION STRING: @(#) ./bin/ethshmcleanup 11_3_0_0_130 [08/19/22 19:11]

# If a PSM3 job terminates abnormally, such as with a segmentation fault, there could
# be POSIX shared memory files left over in the /dev/shm directory. This script is
# intended to remove not used file

readonly BASENAME="$(basename $0)"

Usage_full()
{
	echo "Usage: $BASENAME" >&2
	echo "              or" >&2
	echo "       $BASENAME --help" >&2
	echo "   --help - produce full help text" >&2
	echo >&2
	echo "Clean up not used POSIX shared memory files in /dev/shm:"  >&2
	echo "    /dev/shm/psm3_shm.*" >&2
	echo "    /dev/shm/sem.psm3_nic_affinity*" >&2
	echo "    /dev/shm/psm3_nic_affinity*" >&2
	echo >&2
    echo "example:">&2
	echo "   ${BASENAME}" >&2	
	exit 0
}

Usage()
{
	echo "Usage: $BASENAME" >&2
	echo "              or" >&2
	echo "       $BASENAME --help" >&2
	echo "   --help - produce full help text" >&2
	echo >&2
    echo "example:">&2
	echo "   ${BASENAME}" >&2	
	exit 2
}

if [ x"$1" = "x--help" ]
then
	Usage_full
fi

if [ $# -gt 0 ]
then
	Usage
fi

files=`ls /dev/shm/psm3_shm.* \
		  /dev/shm/sem.psm3_nic_affinity* \
		  /dev/shm/psm3_nic_affinity* 2> /dev/null`;

for file in $files;
do
	# fuser util returns PIDs of processes using the file.
	# So, if output is empty, no one uses shm file and it
	# could be removed
	# If error is detected during fuser command execution,
	# no any actions are performed.
	#
	# Note, that return code of "fuser" cannot be used here,
	# because fuser returns a non-zero return code if no one uses file
	# or in case of a fatal error. So we can relay only on 0 code,
	# but this case means that file is used.

	rc=`fuser $file 2>&1`;

	if [ -z "$rc" ];
	then
		rm -f $file > /dev/null 2>&1;
	fi;
done;

exit 0
