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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 "libdm/loop_control.h"
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <android-base/file.h>
#include <android-base/unique_fd.h>
#include <gtest/gtest.h>
#include "test_util.h"
using namespace std;
using namespace android::dm;
using unique_fd = android::base::unique_fd;
static unique_fd TempFile() {
// A loop device needs to be at least one sector to actually work, so fill
// up the file with a message.
unique_fd fd(CreateTempFile("temp", 0));
if (fd < 0) {
return {};
}
char buffer[] = "Hello";
for (size_t i = 0; i < 1000; i++) {
if (!android::base::WriteFully(fd, buffer, sizeof(buffer))) {
perror("write");
return {};
}
}
return fd;
}
TEST(libdm, LoopControl) {
unique_fd fd = TempFile();
ASSERT_GE(fd, 0);
LoopDevice loop(fd);
ASSERT_TRUE(loop.valid());
char buffer[6];
unique_fd loop_fd(open(loop.device().c_str(), O_RDWR));
ASSERT_GE(loop_fd, 0);
ASSERT_TRUE(android::base::ReadFully(loop_fd, buffer, sizeof(buffer)));
ASSERT_EQ(memcmp(buffer, "Hello", 6), 0);
}
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