89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
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// ----------------------------------------------------------------------------
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//
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// MemFile.c
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//
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// Memory handling module
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//
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// Build: May-12-97
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//
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// Author: J. Eckhardt
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// This code was written for ECO Kommunikation Insight
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// Copyright (c) 1997-1999 Microsoft Corporation
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// ----------------------------------------------------------------------------
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#include <windows.h>
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#include <TCHAR.h>
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#include <WinSvc.h>
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#include "_UMTool.h"
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// -------------------------------------------------------------------
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// task independent memory
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// -------------------------------------------------------------------
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HANDLE CreateIndependentMemory(LPTSTR name, DWORD size, BOOL inherit)
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{
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LPSECURITY_ATTRIBUTES psa = NULL;
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obj_sec_attr_ts sa;
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HANDLE hFileMap;
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if (inherit)
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{
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psa = &sa.sa;
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InitSecurityAttributesEx(&sa, GENERIC_ALL, GENERIC_READ|GENERIC_WRITE);
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}
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hFileMap = CreateFileMapping(INVALID_HANDLE_VALUE, psa, PAGE_READWRITE, 0, size,name);
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DBPRINTF(TEXT("CreateIndependentMemory: CreateFileMapping(%s) returns %d\r\n"), name, GetLastError());
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if (inherit)
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ClearSecurityAttributes(&sa);
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if (hFileMap == INVALID_HANDLE_VALUE)
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{
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return NULL;
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}
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return hFileMap;
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}
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// ---------------------------
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LPVOID AccessIndependentMemory(LPTSTR name, DWORD size, DWORD dwDesiredAccess, PDWORD_PTR accessID)
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{
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HANDLE hMap;
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LPVOID n;
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*accessID = 0;
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hMap = OpenFileMapping(dwDesiredAccess, FALSE, name);
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if (!hMap)
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{
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return NULL;
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}
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n = MapViewOfFile(hMap, dwDesiredAccess, 0, 0, size);
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if (!n)
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{
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CloseHandle(hMap);
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return NULL;
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}
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*accessID = (DWORD_PTR)hMap;
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return n;
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}
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// ---------------------------
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void UnAccessIndependentMemory(LPVOID data, DWORD_PTR accessID)
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{
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if (data)
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UnmapViewOfFile(data);
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if (accessID)
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CloseHandle((HANDLE)accessID);
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}
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// ---------------------------
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void DeleteIndependentMemory(HANDLE id)
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{
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if (id)
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CloseHandle(id);
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}
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