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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "MemMapSnapshot.h"
#include "mozilla/ResultExtensions.h"
namespace mozilla::ipc {
Result<Ok, nsresult> MemMapSnapshot::Init(size_t aSize) {
MOZ_ASSERT(!mMem);
auto aMem = MakeRefPtr<SharedMemory>();
if (NS_WARN_IF(!aMem->CreateFreezable(aSize))) {
return Err(NS_ERROR_FAILURE);
}
if (NS_WARN_IF(!aMem->Map(aSize))) {
return Err(NS_ERROR_FAILURE);
}
mMem = std::move(aMem);
return Ok();
}
Result<Ok, nsresult> MemMapSnapshot::Finalize(RefPtr<SharedMemory>& aMem) {
MOZ_ASSERT(mMem);
auto size = mMem->Size();
if (NS_WARN_IF(!mMem->Freeze())) {
return Err(NS_ERROR_FAILURE);
}
aMem = std::move(mMem);
// We need to re-map the memory as `Freeze()` unmaps it.
if (NS_WARN_IF(!aMem->Map(size))) {
return Err(NS_ERROR_FAILURE);
}
return Ok();
}
} // namespace mozilla::ipc