stress2: Added a new ptrace() test scenario

tools/test/stress2/misc/truss2.sh

@@ -0,0 +1,58 @@
+#!/bin/sh
+
+#
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
+# Copyright (c) 2021 Peter Holm
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+
+# Trace random cc, c++ or make threads from a buildkernel
+# Test scenario idea by kib@
+
+old=`sysctl -in kern.kill_on_debugger_exit`
+[ -z "$old" ] && exit 0
+trap "sysctl kern.kill_on_debugger_exit=$old" EXIT INT
+
+# Enable ptrace(2)d processes to continue
+sysctl kern.kill_on_debugger_exit=0
+./buildkernel.sh & kpid=$!
+while true; do
+	for i in `jot 8`; do
+		rpid=`ps -l | grep -vwE 'grep|RE|defunct' | \
+		    grep -E "(cc|c\+\+|make) " | \
+		    sort -R | head -1 | awk '{print $2}'`
+		[ -n "$rpid" ] && break
+		sleep 1
+	done
+	[ -z "$rpid" ] && break
+	kill -0 $rpid 2>/dev/null || continue
+	ps -lp $rpid | tail -1
+	echo "truss -f -o /dev/null -p $rpid"
+	truss -f -o /dev/null -p $rpid & tpid=$!
+	sleep `jot -r 1 5 10`
+	pkill -9 truss
+	wait $tpid
+done
+wait $kpid
+exit $?