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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <android-base/macros.h>
#include <gtest/gtest.h>
#include <stdlib.h>
#include <unistd.h>
#include <iostream>
#include "bpf/BpfMap.h"
#include "bpf/BpfUtils.h"
#include "include/libbpf_android.h"
using ::testing::Test;
constexpr const char tp_prog_path[] =
"/sys/fs/bpf/prog_bpf_load_tp_prog_tracepoint_sched_sched_switch";
constexpr const char tp_map_path[] = "/sys/fs/bpf/map_bpf_load_tp_prog_cpu_pid_map";
namespace android {
namespace bpf {
class BpfLoadTest : public testing::Test {
protected:
BpfLoadTest() {}
int mProgFd;
void SetUp() {
unlink(tp_prog_path);
unlink(tp_map_path);
bool critical = true;
EXPECT_EQ(android::bpf::loadProg("/system/etc/bpf/bpf_load_tp_prog.o", &critical), 0);
EXPECT_EQ(false, critical);
mProgFd = bpf_obj_get(tp_prog_path);
EXPECT_GT(mProgFd, 0);
int ret = bpf_attach_tracepoint(mProgFd, "sched", "sched_switch");
EXPECT_NE(ret, 0);
}
void TearDown() {
close(mProgFd);
unlink(tp_prog_path);
unlink(tp_map_path);
}
void checkMapNonZero() {
// The test program installs a tracepoint on sched:sched_switch
// and expects the kernel to populate a PID corresponding to CPU
android::bpf::BpfMap<uint32_t, uint32_t> m(tp_map_path);
// Wait for program to run a little
sleep(1);
int non_zero = 0;
const auto iterFunc = [&non_zero](const uint32_t& key, const uint32_t& val,
BpfMap<uint32_t, uint32_t>& map) {
if (val && !non_zero) {
non_zero = 1;
}
UNUSED(key);
UNUSED(map);
return base::Result<void>();
};
EXPECT_RESULT_OK(m.iterateWithValue(iterFunc));
EXPECT_EQ(non_zero, 1);
}
};
TEST_F(BpfLoadTest, bpfCheckMap) {
checkMapNonZero();
}
} // namespace bpf
} // namespace android
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