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#!/bin/sh
#
# Copyright 2020 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# This checks whether stream_open symbol is available from the target kernel.
#
# Output meanings:
# -1 : stream_open is not available
# 0 : unknown whether or not stream_open is available
# 1 : stream_open is available
symbols="$(< "/lib/modules/$(uname -r)/build/Module.symvers" \
awk '{print $2}' | grep -E '^(nonseekable_open|stream_open)$')"
if echo "${symbols}" | grep -q '^stream_open$'; then
echo 1
elif echo "${symbols}" | grep -q '^nonseekable_open$'; then
echo -1
else
echo 0
fi
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