64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/devtools/AutoMemMap.h"
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#include "mozilla/Unused.h"
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#include "nsDebug.h"
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namespace mozilla {
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namespace devtools {
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AutoMemMap::~AutoMemMap()
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{
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if (addr) {
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Unused << NS_WARN_IF(PR_MemUnmap(addr, size()) != PR_SUCCESS);
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addr = nullptr;
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}
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if (fileMap) {
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Unused << NS_WARN_IF(PR_CloseFileMap(fileMap) != PR_SUCCESS);
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fileMap = nullptr;
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}
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if (fd) {
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Unused << NS_WARN_IF(PR_Close(fd) != PR_SUCCESS);
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fd = nullptr;
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}
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}
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nsresult
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AutoMemMap::init(const char* filePath, int flags, int mode, PRFileMapProtect prot)
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{
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MOZ_ASSERT(!fd);
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MOZ_ASSERT(!fileMap);
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MOZ_ASSERT(!addr);
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if (PR_GetFileInfo64(filePath, &fileInfo) != PR_SUCCESS)
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return NS_ERROR_FILE_NOT_FOUND;
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// Check if the file is too big to memmap.
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if (fileInfo.size > int64_t(UINT32_MAX))
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return NS_ERROR_INVALID_ARG;
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auto length = uint32_t(fileInfo.size);
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fd = PR_Open(filePath, flags, flags);
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if (!fd)
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return NS_ERROR_UNEXPECTED;
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fileMap = PR_CreateFileMap(fd, fileInfo.size, prot);
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if (!fileMap)
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return NS_ERROR_UNEXPECTED;
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addr = PR_MemMap(fileMap, 0, length);
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if (!addr)
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return NS_ERROR_UNEXPECTED;
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return NS_OK;
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}
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} // namespace devtools
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} // namespace mozilla
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