2 // MemoryMappedViewStream.cs
5 // Zoltan Varga (vargaz@gmail.com)
7 // Copyright (C) 2009, Novell, Inc (http://www.novell.com)
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
33 using Mono.Unix.Native;
35 namespace System.IO.MemoryMappedFiles
37 public sealed class MemoryMappedViewStream : UnmanagedMemoryStream {
43 internal MemoryMappedViewStream (int fd, long offset, long size, MemoryMappedFileAccess access) {
45 monitor = new Object ();
47 CreateStreamPosix (fd, offset, size, access);
49 throw new NotImplementedException ("Not implemented on windows.");
52 unsafe void CreateStreamPosix (int fd, long offset, long size, MemoryMappedFileAccess access)
55 mmap_size = (ulong) size;
56 MemoryMappedFile.MapPosix (fd, offset, size, access, out mmap_addr, out offset_diff);
61 case MemoryMappedFileAccess.ReadWrite:
62 faccess = FileAccess.ReadWrite;
64 case MemoryMappedFileAccess.Read:
65 faccess = FileAccess.Read;
67 case MemoryMappedFileAccess.Write:
68 faccess = FileAccess.Write;
71 throw new NotImplementedException ("access mode " + access + " not supported.");
73 Initialize ((byte*)mmap_addr + offset_diff, size, size, faccess);
76 protected override void Dispose (bool disposing)
78 base.Dispose (disposing);
80 if (mmap_addr != (IntPtr)(-1)) {
81 MemoryMappedFile.UnmapPosix (mmap_addr, mmap_size);
82 mmap_addr = (IntPtr)(-1);
87 public override void Flush ()
92 throw new NotImplementedException ("Not implemented on Windows");