зеркало из https://github.com/mozilla/gecko-dev.git
98 строки
2.2 KiB
C++
98 строки
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim: set ts=8 sts=4 et sw=4 tw=99: */
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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 "AutoMemMap.h"
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#include "ScriptPreloader-inl.h"
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#include "mozilla/Unused.h"
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#include "nsIFile.h"
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#include <private/pprio.h>
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namespace mozilla {
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namespace loader {
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using namespace mozilla::ipc;
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AutoMemMap::~AutoMemMap()
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{
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if (fileMap) {
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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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Unused << NS_WARN_IF(PR_CloseFileMap(fileMap) != PR_SUCCESS);
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fileMap = nullptr;
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}
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}
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FileDescriptor
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AutoMemMap::cloneFileDescriptor()
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{
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if (fd.get()) {
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auto handle = FileDescriptor::PlatformHandleType(PR_FileDesc2NativeHandle(fd.get()));
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return FileDescriptor(handle);
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}
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return FileDescriptor();
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}
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Result<Ok, nsresult>
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AutoMemMap::init(nsIFile* file, int flags, int mode, PRFileMapProtect prot)
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{
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MOZ_ASSERT(!fd);
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MOZ_TRY(file->OpenNSPRFileDesc(flags, mode, &fd.rwget()));
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return initInternal(prot);
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}
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Result<Ok, nsresult>
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AutoMemMap::init(const FileDescriptor& file)
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{
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MOZ_ASSERT(!fd);
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if (!file.IsValid()) {
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return Err(NS_ERROR_INVALID_ARG);
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}
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auto handle = file.ClonePlatformHandle();
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fd = PR_ImportFile(PROsfd(handle.get()));
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if (!fd) {
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return Err(NS_ERROR_FAILURE);
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}
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Unused << handle.release();
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return initInternal();
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}
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Result<Ok, nsresult>
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AutoMemMap::initInternal(PRFileMapProtect prot)
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{
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MOZ_ASSERT(!fileMap);
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MOZ_ASSERT(!addr);
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PRFileInfo64 fileInfo;
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MOZ_TRY(PR_GetOpenFileInfo64(fd.get(), &fileInfo));
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if (fileInfo.size > UINT32_MAX)
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return Err(NS_ERROR_INVALID_ARG);
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fileMap = PR_CreateFileMap(fd, 0, prot);
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if (!fileMap)
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return Err(NS_ERROR_FAILURE);
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size_ = fileInfo.size;
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addr = PR_MemMap(fileMap, 0, size_);
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if (!addr)
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return Err(NS_ERROR_FAILURE);
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return Ok();
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}
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} // namespace loader
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} // namespace mozilla
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