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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 <fcntl.h>
#include <linux/memfd.h>
#include <stdio.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>
#include "test_util.h"
namespace android {
namespace dm {
using unique_fd = android::base::unique_fd;
// Create a temporary in-memory file. If size is non-zero, the file will be
// created with a fixed size.
unique_fd CreateTempFile(const std::string& name, size_t size) {
unique_fd fd(syscall(__NR_memfd_create, name.c_str(), MFD_ALLOW_SEALING));
if (fd < 0) {
return {};
}
if (size) {
if (ftruncate(fd, size) < 0) {
perror("ftruncate");
return {};
}
if (fcntl(fd, F_ADD_SEALS, F_SEAL_GROW | F_SEAL_SHRINK) < 0) {
perror("fcntl");
return {};
}
}
return fd;
}
} // namespace dm
} // namespace android
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