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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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/devtools/AutoMemMap.h"
#include "mozilla/Unused.h"
#include "nsDebug.h"
namespace mozilla {
namespace devtools {
AutoMemMap::~AutoMemMap() {
if (addr) {
Unused << NS_WARN_IF(PR_MemUnmap(addr, size()) != PR_SUCCESS);
addr = nullptr;
}
if (fileMap) {
Unused << NS_WARN_IF(PR_CloseFileMap(fileMap) != PR_SUCCESS);
fileMap = nullptr;
}
if (fd) {
Unused << NS_WARN_IF(PR_Close(fd) != PR_SUCCESS);
fd = nullptr;
}
}
nsresult AutoMemMap::init(nsIFile* file, int flags, int mode,
PRFileMapProtect prot) {
MOZ_ASSERT(!fd);
MOZ_ASSERT(!fileMap);
MOZ_ASSERT(!addr);
nsresult rv;
int64_t inputFileSize;
rv = file->GetFileSize(&inputFileSize);
if (NS_FAILED(rv)) {
return rv;
}
// Check if the file is too big to memmap.
if (inputFileSize > int64_t(UINT32_MAX)) {
return NS_ERROR_INVALID_ARG;
}
fileSize = uint32_t(inputFileSize);
rv = file->OpenNSPRFileDesc(flags, mode, &fd);
if (NS_FAILED(rv)) {
return rv;
}
if (!fd) return NS_ERROR_UNEXPECTED;
fileMap = PR_CreateFileMap(fd, inputFileSize, prot);
if (!fileMap) return NS_ERROR_UNEXPECTED;
addr = PR_MemMap(fileMap, 0, fileSize);
if (!addr) return NS_ERROR_UNEXPECTED;
return NS_OK;
}
} // namespace devtools
} // namespace mozilla
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