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chapter16/proc_wait.ksh

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+#!/usr/bin/ksh
+#
+# SCRIPT: proc_wait.ksh
+#
+# AUTHOR: Randy Michael
+#
+# DATE: 02/14/2007
+#
+# REV: 1.1.A
+#
+# PURPOSE: This script is used to wait for a process to start.
+#       The process, specified by ARG 1 as passed to this script, should not
+#	currently be running when this is started.  This script waits for the
+#	process to start and exits.
+#
+# set -x # Uncomment to debug this script
+# set -n # Uncomment to debug without any command execution
+
+################ FUNCTIONS #############################
+########################################################
+function usage
+{
+	echo "\n\n"
+	echo "USAGE: `basename $0` {Process_to_monitor}"
+	echo "\nEXAMPLE: `basename $0` bffcreate\n"
+	echo "Try again...EXITING...\n"
+}
+########################################################
+function exit_trap
+{
+	echo "\n...EXITING on trapped signal...\n"
+}
+########################################################
+
+
+################ START OF MAIN##########################
+
+if [ $# -ne 1 ]
+then
+	usage
+	exit 1
+else
+	ARG1="$1"
+fi
+
+# Set a trap...
+trap 'exit_trap; exit 2' 1 2 3 15
+
+# Check to execute or just exit...
+ps -ef | grep $ARG1 | grep -v "grep $ARG1" | grep -v `basename $0` \
+ >/dev/null
+
+if [ $? -eq 0 ]
+then
+	echo "\n\n$ARG1 is an active process...EXITING...\n"
+	exit 1
+fi
+
+##### O.K. The process is NOT running, start monitoring for startup...
+
+SLEEP_TIME="1" # Seconds between monitoring
+RC="1"		 # RC is the Return Code
+echo "\n\n"	 # Give a couple of blank lines
+
+echo "WAITING for $ARG1 to start...`date`\n"
+
+until [ $RC -eq 0 ] # Loop until the return code is zero
+do
+	ps -ef | grep $ARG1 | egrep -v "grep $ARG1" | grep -v `basename $0` \
+	 >/dev/null 2>&1
+	RC="$?"
+	if [ $RC -eq 0 ]
+	then
+		echo "$ARG1 is RUNNING...`date`\n"
+		exit 0
+	fi
+	sleep $SLEEP_TIME
+done