--- /dev/null
+#!/bin/bash
+
+PGREP="$1"
+
+if [ x$LTTNG_TOOLS_TESTS_DISABLE_WARN_LTTNG_PROCESSES == x1 ]; then
+ exit
+fi
+
+color_warn='\E[1;33m'
+color_reset='\E[0m'
+color_bold='\E[1m'
+
+lttng_processes="$("$PGREP" -l 'lttng|gen-ust-.+')"
+
+if [ $? -eq 0 ]; then
+ pids="$(cut -d ' ' -f 1 <<< "$lttng_processes" | tr '\n' ' ')"
+
+ echo -e "${color_warn}Warning: the following LTTng processes were detected running on the system:$color_reset"
+ echo
+ echo "$lttng_processes"
+ echo
+ echo -e "Here's how to kill them: ${color_bold}kill -9 $pids$color_reset"
+ echo -e "${color_warn}If you leave them alive, some tests could fail.$color_reset"
+ echo
+fi