1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
7 #include "MemMapSnapshot.h"
9 #include "mozilla/AutoMemMap.h"
10 #include "mozilla/ResultExtensions.h"
11 #include "mozilla/Try.h"
12 #include "mozilla/ipc/FileDescriptor.h"
14 namespace mozilla::ipc
{
16 Result
<Ok
, nsresult
> MemMapSnapshot::Init(size_t aSize
) {
17 MOZ_ASSERT(!mInitialized
);
19 if (NS_WARN_IF(!mMem
.CreateFreezeable(aSize
))) {
20 return Err(NS_ERROR_FAILURE
);
22 if (NS_WARN_IF(!mMem
.Map(aSize
))) {
23 return Err(NS_ERROR_FAILURE
);
30 Result
<Ok
, nsresult
> MemMapSnapshot::Finalize(loader::AutoMemMap
& aMem
) {
31 MOZ_ASSERT(mInitialized
);
33 if (NS_WARN_IF(!mMem
.Freeze())) {
34 return Err(NS_ERROR_FAILURE
);
36 // TakeHandle resets mMem, so call max_size first.
37 size_t size
= mMem
.max_size();
38 FileDescriptor
memHandle(mMem
.TakeHandle());
39 MOZ_TRY(aMem
.initWithHandle(memHandle
, size
));
45 } // namespace mozilla::ipc