/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "libdm/loop_control.h"
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <android-base/file.h>
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#include <android-base/unique_fd.h>
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#include <gtest/gtest.h>
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#include "test_util.h"
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using namespace std;
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using namespace android::dm;
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using unique_fd = android::base::unique_fd;
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static unique_fd TempFile() {
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// A loop device needs to be at least one sector to actually work, so fill
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// up the file with a message.
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unique_fd fd(CreateTempFile("temp", 0));
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if (fd < 0) {
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return {};
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}
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char buffer[] = "Hello";
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for (size_t i = 0; i < 1000; i++) {
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if (!android::base::WriteFully(fd, buffer, sizeof(buffer))) {
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perror("write");
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return {};
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}
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}
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return fd;
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}
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TEST(libdm, LoopControl) {
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unique_fd fd = TempFile();
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ASSERT_GE(fd, 0);
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LoopDevice loop(fd);
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ASSERT_TRUE(loop.valid());
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char buffer[6];
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unique_fd loop_fd(open(loop.device().c_str(), O_RDWR));
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ASSERT_GE(loop_fd, 0);
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ASSERT_TRUE(android::base::ReadFully(loop_fd, buffer, sizeof(buffer)));
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ASSERT_EQ(memcmp(buffer, "Hello", 6), 0);
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}
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