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//
// MemoryMappedFile.cs
//
// Authors:
// Zoltan Varga (vargaz@gmail.com)
//
// Copyright (C) 2009, Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_4_0
using System;
using System.IO;
using System.Collections.Generic;
using Microsoft.Win32.SafeHandles;
using Mono.Unix.Native;
namespace System.IO.MemoryMappedFiles
{
public class MemoryMappedFile : IDisposable {
FileStream stream;
[MonoTODO]
public static MemoryMappedFile CreateFromFile (FileStream fileStream) {
if (fileStream == null)
throw new ArgumentNullException ("fileStream");
return new MemoryMappedFile () { stream = fileStream };
}
[MonoTODO]
public static MemoryMappedFile CreateFromFile (FileStream fileStream, string mapName) {
throw new NotImplementedException ();
}
[MonoTODO]
public static MemoryMappedFile CreateFromFile (FileStream fileStream, string mapName, long capacity) {
throw new NotImplementedException ();
}
[MonoTODO]
public static MemoryMappedFile CreateFromFile (FileStream fileStream, string mapName, long capacity, MemoryMappedFileAccess access) {
throw new NotImplementedException ();
}
/*
[MonoTODO]
public static MemoryMappedFile CreateFromFile (FileStream fileStream, string mapName, long capacity, MemoryMappedFileAccess access, MemoryMappedFileSecurity memoryMappedFileSecurity, HandleInheritability inheritability, bool leaveOpen) {
throw new NotImplementedException ();
}
*/
[MonoTODO]
public static MemoryMappedFile CreateNew (string mapName, long capacity) {
throw new NotImplementedException ();
}
[MonoTODO]
public static MemoryMappedFile CreateNew (string mapName, long capacity, MemoryMappedFileAccess access) {
throw new NotImplementedException ();
}
/*
[MonoTODO]
public static MemoryMappedFile CreateNew (string mapName, long capacity, MemoryMappedFileAccess access, MemoryMappedFileOptions options, MemoryMappedFileSecurity memoryMappedFileSecurity, HandleInheritability handleInheritability) {
throw new NotImplementedException ();
}
*/
[MonoTODO]
public static MemoryMappedFile CreateOrOpen (string mapName, long capacity) {
throw new NotImplementedException ();
}
[MonoTODO]
public static MemoryMappedFile CreateOrOpen (string mapName, long capacity, MemoryMappedFileAccess access) {
throw new NotImplementedException ();
}
/*
[MonoTODO]
public static MemoryMappedFile CreateOrOpen (string mapName, long capacity, MemoryMappedFileAccess access, MemoryMappedFileOptions options, MemoryMappedFileSecurity memoryMappedFileSecurity, HandleInheritability handleInheritability) {
throw new NotImplementedException ();
}
*/
public MemoryMappedViewStream CreateViewStream () {
return CreateViewStream (0, 0);
}
public MemoryMappedViewStream CreateViewStream (long offset, long size) {
return CreateViewStream (offset, size, MemoryMappedFileAccess.ReadWrite);
}
[MonoTODO]
public MemoryMappedViewStream CreateViewStream (long offset, long size, MemoryMappedFileAccess access) {
return new MemoryMappedViewStream (stream, offset, size, access);
}
public MemoryMappedViewAccessor CreateViewAccessor () {
return CreateViewAccessor (0, 0);
}
public MemoryMappedViewAccessor CreateViewAccessor (long offset, long size) {
return CreateViewAccessor (offset, size, MemoryMappedFileAccess.ReadWrite);
}
[MonoTODO]
public MemoryMappedViewAccessor CreateViewAccessor (long offset, long size, MemoryMappedFileAccess access) {
return new MemoryMappedViewAccessor (stream, offset, size, access);
}
MemoryMappedFile () {
}
[MonoTODO]
public void Dispose () {
}
[MonoTODO]
public SafeMemoryMappedFileHandle SafeMemoryMappedFileHandle {
get {
throw new NotImplementedException ();
}
}
static int pagesize;
internal static unsafe void MapPosix (FileStream file, long offset, long size, MemoryMappedFileAccess access, out IntPtr map_addr, out int offset_diff, out ulong map_size) {
if (pagesize == 0)
pagesize = Syscall.getpagesize ();
long fsize = file.Length;
if (size == 0 || size > fsize)
size = fsize;
// Align offset
long real_offset = offset & ~(pagesize - 1);
offset_diff = (int)(offset - real_offset);
// FIXME: Need to determine the unix fd for the file, Handle is only
// equal to it by accident
map_size = (ulong)size;
map_addr = Syscall.mmap (IntPtr.Zero, map_size, MmapProts.PROT_READ, MmapFlags.MAP_SHARED, (int)file.Handle, real_offset);
if (map_addr == (IntPtr)(-1))
throw new IOException ("mmap failed for " + file + "(" + offset + ", " + size + ")");
}
internal static void UnmapPosix (IntPtr map_addr, ulong map_size) {
int err = Syscall.munmap (map_addr, map_size);
if (err != 0)
/* This shouldn't happen */
throw new IOException ("munmap failed for address " + map_addr + ", size=" + map_size);
}
}
}
#endif
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