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a89b67e772
Backed out changeset a8518ea4b594 (bug 1479960) Backed out changeset 7172762c4b87 (bug 1536697) Backed out changeset 2ea5ccb8f3a1 (bug 1426526) Backed out changeset d892a888fe9c (bug 1426526) Backed out changeset 2c4d12bdfec3 (bug 1479960) Backed out changeset 8a322064cf6d (bug 1479960) Backed out changeset 47d387b6cd4a (bug 1479960) Backed out changeset 8332565a6943 (bug 1479960) Backed out changeset 9d7f1835f96f (bug 1479960) Backed out changeset 0aa8af4965c5 (bug 1479960) Backed out changeset 036809330a51 (bug 1479960) Backed out changeset 39e18373e3d3 (bug 1479960) Backed out changeset 6c2b995a9d30 (bug 1479960) Backed out changeset 3c2b31744645 (bug 1534780) Backed out changeset 26bb00a94d5d (bug 1534780)
63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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#ifndef dom_ipc_MemMapSnapshot_h
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#define dom_ipc_MemMapSnapshot_h
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#include "mozilla/AutoMemMap.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/RangedPtr.h"
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#include "mozilla/Result.h"
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#ifdef XP_WIN
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# include "mozilla/ipc/FileDescriptor.h"
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#endif
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namespace mozilla {
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namespace ipc {
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/**
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* A helper class for creating a read-only snapshot of memory-mapped data.
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*
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* The Init() method initializes a read-write memory mapped region of the given
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* size, which can be initialized with arbitrary data. The Finalize() method
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* remaps that region as read-only (and backs it with a read-only file
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* descriptor), and initializes an AutoMemMap with the new contents.
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*
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* The file descriptor for the resulting AutoMemMap can be shared among
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* processes, to safely access a shared, read-only copy of the data snapshot.
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*/
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class MOZ_RAII MemMapSnapshot {
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public:
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Result<Ok, nsresult> Init(size_t aSize);
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Result<Ok, nsresult> Finalize(loader::AutoMemMap& aMap);
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template <typename T = void>
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RangedPtr<T> Get() {
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MOZ_ASSERT(mInitialized);
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return mMem.get<T>();
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}
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private:
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Result<Ok, nsresult> Create(size_t aSize);
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Result<Ok, nsresult> Freeze(loader::AutoMemMap& aMem);
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loader::AutoMemMap mMem;
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bool mInitialized = false;
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#ifdef XP_WIN
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Maybe<FileDescriptor> mFile;
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#else
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nsCString mPath;
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#endif
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};
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} // namespace ipc
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} // namespace mozilla
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#endif // dom_ipc_MemMapSnapshot_h
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