BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Log/Log4net/Appender/LocalSyslogAppender.cs

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#region Apache License
//
// Licensed to the Apache Software Foundation (ASF) under one or more 
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership. 
// The ASF licenses this file to you under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with 
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#endregion

// .NET Compact Framework 1.0 has no support for Marshal.StringToHGlobalAnsi
// SSCLI 1.0 has no support for Marshal.StringToHGlobalAnsi
#if !NETCF && !SSCLI

using System;
using System.Runtime.InteropServices;

using log4net.Core;
using log4net.Appender;
using log4net.Util;
using log4net.Layout;

namespace log4net.Appender 
{
	/// <summary>
	/// Logs events to a local syslog service.
	/// </summary>
	/// <remarks>
	/// <note>
	/// This appender uses the POSIX libc library functions <c>openlog</c>, <c>syslog</c>, and <c>closelog</c>.
	/// If these functions are not available on the local system then this appender will not work!
	/// </note>
	/// <para>
	/// The functions <c>openlog</c>, <c>syslog</c>, and <c>closelog</c> are specified in SUSv2 and 
	/// POSIX 1003.1-2001 standards. These are used to log messages to the local syslog service.
	/// </para>
	/// <para>
	/// This appender talks to a local syslog service. If you need to log to a remote syslog
	/// daemon and you cannot configure your local syslog service to do this you may be
	/// able to use the <see cref="RemoteSyslogAppender"/> to log via UDP.
	/// </para>
	/// <para>
	/// Syslog messages must have a facility and and a severity. The severity
	/// is derived from the Level of the logging event.
	/// The facility must be chosen from the set of defined syslog 
	/// <see cref="SyslogFacility"/> values. The facilities list is predefined
	/// and cannot be extended.
	/// </para>
	/// <para>
	/// An identifier is specified with each log message. This can be specified
	/// by setting the <see cref="Identity"/> property. The identity (also know