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