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91efa87e62
We're not using named shared memory, and supporting only anonymous shared memory allows using other backends that are more compatible with preventing a process from accessing any shared memory it wasn't explicitly granted (i.e., sandboxing). Specifically: SharedMemory::Open is removed; SharedMemory::Create no longer takes a name, no longer has the open_existing option which doesn't apply to anonymous memory, and no longer supports read-only memory (anonymous memory which can never have been written isn't very useful). This patch also fixes some comments in what remains of SharedMemory::Create. MozReview-Commit-ID: 4kBrURtxq20 --HG-- extra : rebase_source : f6b1fb2fc79b6e9cdd251b3d9041036c0be503f9
79 lines
1.3 KiB
C++
79 lines
1.3 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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#include "SharedDIB.h"
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namespace mozilla {
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namespace gfx {
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SharedDIB::SharedDIB() :
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mShMem(nullptr)
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{
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}
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SharedDIB::~SharedDIB()
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{
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Close();
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}
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nsresult
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SharedDIB::Create(uint32_t aSize)
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{
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Close();
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mShMem = new base::SharedMemory();
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if (!mShMem || !mShMem->Create(aSize))
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return NS_ERROR_OUT_OF_MEMORY;
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return NS_OK;
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}
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bool
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SharedDIB::IsValid()
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{
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if (!mShMem)
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return false;
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return base::SharedMemory::IsHandleValid(mShMem->handle());
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}
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nsresult
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SharedDIB::Close()
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{
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delete mShMem;
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mShMem = nullptr;
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return NS_OK;
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}
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nsresult
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SharedDIB::Attach(Handle aHandle, uint32_t aSize)
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{
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Close();
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mShMem = new base::SharedMemory(aHandle, false);
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if(!mShMem)
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return NS_ERROR_OUT_OF_MEMORY;
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return NS_OK;
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}
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nsresult
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SharedDIB::ShareToProcess(base::ProcessId aTargetPid, Handle *aNewHandle)
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{
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if (!mShMem)
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return NS_ERROR_UNEXPECTED;
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if (!mShMem->ShareToProcess(aTargetPid, aNewHandle))
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return NS_ERROR_UNEXPECTED;
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return NS_OK;
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}
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} // namespace gfx
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} // namespace mozilla
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