tst.execfail.ksh   [plain text]

#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
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# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
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#
# Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#
#pragma ident	"@(#)tst.execfail.ksh	1.1	06/08/28 SMI"

#
# This script tests that -- if a exec(2) fails -- the proc:::exec probe fires,
# followed by the proc:::exec-success probe (in a successful exec(2)).  To
# circumvent any potential shell cleverness, this script generates exec
# failure by generating a file with a bogus interpreter.  (It seems unlikely
# that a shell -- regardless of how clever it claims to be -- would bother to
# validate the interpreter before exec'ing.)
#
# If this fails, the script will run indefinitely; it relies on the harness
# to time it out.
#
script()
{
	$dtrace -s /dev/stdin <<EOF
	proc:::exec
	/curpsinfo->pr_ppid == $child && args[0] == "$badexec"/
	{
		self->exec = 1;
	}

	proc:::exec-failure
	/self->exec/
	{
		exit(0);
	}
EOF
}

sleeper()
{
	while true; do
		if [ -f /usr/lib/dtrace/darwin.d ]; then
			/bin/sleep 1
		else
			/usr/bin/sleep 1
		fi
		$badexec
	done
}

badexec=/tmp/execfail.ksh.$$
dtrace=/usr/sbin/dtrace

cat > $badexec <<EOF
#!/this_is_a_bogus_interpreter
EOF

chmod +x $badexec

sleeper &
child=$!
script
status=$?

kill $child
rm $badexec

exit $status