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//
// System.Runtime.Remoting.Channels.Ipc.Win32.NamedPipeListener.cs
//
// Author: Robert Jordan (robertj@gmx.net)
//
// Copyright (C) 2005 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.
//
using System.Runtime.InteropServices;
using System.Threading;
namespace System.Runtime.Remoting.Channels.Ipc.Win32
{
/// <summary>
/// Listens for connections from local local Named Pipe clients.
/// </summary>
internal class NamedPipeListener
{
const uint DefaultBufferSize = 4096;
readonly string pipeName;
public string Name
{
get { return pipeName; }
}
/// <summary>
/// Creates a new listener with the local local Named Pipe name obtained form the specified UID.
/// </summary>
/// <param name="uid">The UID.</param>
public NamedPipeListener(Guid uid)
: this(uid.ToString("N"))
{
}
/// <summary>
/// Creates a new listener with the specified name.
/// </summary>
/// <param name="pipeName">The pipe name omiting the leading <c>\\.\pipe\</c></param>
public NamedPipeListener(string pipeName)
{
this.pipeName = NamedPipeHelper.FormatPipeName(pipeName);
}
/// <summary>
/// Accepts a pending connection request
/// </summary>
/// <remarks>
/// Accept is a blocking method that returns a NamedPipeSocket you can use to send and receive data.
/// </remarks>
/// <returns>The NamedPipeSocket.</returns>
public NamedPipeSocket Accept()
{
IntPtr hPipe = NamedPipeHelper.CreateNamedPipe(
pipeName,
NamedPipeHelper.PIPE_ACCESS_DUPLEX | NamedPipeHelper.FILE_FLAG_OVERLAPPED,
NamedPipeHelper.PIPE_TYPE_MESSAGE
| NamedPipeHelper.PIPE_READMODE_MESSAGE
| NamedPipeHelper.PIPE_WAIT,
NamedPipeHelper.PIPE_UNLIMITED_INSTANCES,
DefaultBufferSize,
DefaultBufferSize,
NamedPipeHelper.NMPWAIT_USE_DEFAULT_WAIT,
IntPtr.Zero
);
if (hPipe.ToInt32 () == NamedPipeHelper.INVALID_HANDLE_VALUE) {
throw new NamedPipeException (Marshal.GetLastWin32Error ());
}
// Connect the named pipe with overlapped structure
// in order to make it altertable. This way we will
// wake up when someone aborts a thread waiting
// for this pipe.
NativeOverlapped overlapped = new NativeOverlapped ();
bool canConnect = NamedPipeHelper.ConnectNamedPipe (hPipe, ref overlapped);
int lastError = Marshal.GetLastWin32Error ();
if (!canConnect) {
if (lastError == NamedPipeHelper.ERROR_IO_PENDING) {
uint bytesTransferred = 0;
if (!GetOverlappedResultEx (hPipe, ref overlapped, out bytesTransferred, Timeout.Infinite, true)) {
lastError = Marshal.GetLastWin32Error ();
NamedPipeHelper.CloseHandle (hPipe);
throw new NamedPipeException (lastError);
}
canConnect = true;
} else if (lastError == NamedPipeHelper.ERROR_PIPE_CONNECTED)
canConnect = true;
}
if (!canConnect) {
NamedPipeHelper.CloseHandle (hPipe);
throw new NamedPipeException (lastError);
}
return new NamedPipeSocket (hPipe);
}
[DllImport("kernel32.dll", SetLastError = true)]
static extern bool GetOverlappedResultEx (IntPtr hFile, [In] ref System.Threading.NativeOverlapped lpOverlapped,
out uint lpNumberOfBytesTransferred, int dwMilliseconds, bool bAltertable);
}
}
|
