114 lines
4 KiB
C#
114 lines
4 KiB
C#
#region License
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//
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// NS.cs
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//
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// Author:
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// Stefanos A. <stapostol@gmail.com>
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//
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// Copyright (c) 2006-2013 Stefanos Apostolopoulos
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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#endregion
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using System;
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using System.Runtime.InteropServices;
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namespace OpenTK.Platform.MacOS
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{
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internal class NS
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{
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const string Library = "libdl.dylib";
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[DllImport(Library, EntryPoint = "NSIsSymbolNameDefined")]
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static extern bool NSIsSymbolNameDefined(string s);
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[DllImport(Library, EntryPoint = "NSIsSymbolNameDefined")]
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static extern bool NSIsSymbolNameDefined(IntPtr s);
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[DllImport(Library, EntryPoint = "NSLookupAndBindSymbol")]
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static extern IntPtr NSLookupAndBindSymbol(string s);
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[DllImport(Library, EntryPoint = "NSLookupAndBindSymbol")]
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static extern IntPtr NSLookupAndBindSymbol(IntPtr s);
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[DllImport(Library, EntryPoint = "NSAddressOfSymbol")]
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static extern IntPtr NSAddressOfSymbol(IntPtr symbol);
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[DllImport(Library)]
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private static extern IntPtr dlopen(String fileName, int flags);
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[DllImport(Library)]
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private static extern int dlclose(IntPtr handle);
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[DllImport (Library)]
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private static extern IntPtr dlsym (IntPtr handle, string symbol);
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public static IntPtr GetAddress(string function)
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{
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// Instead of allocating and combining strings in managed memory
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// we do that directly in unmanaged memory. This way, we avoid
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// 2 string allocations every time this function is called.
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// must add a '_' prefix and null-terminate the function name,
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// hence we allocate +2 bytes
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IntPtr ptr = Marshal.AllocHGlobal(function.Length + 2);
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try
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{
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Marshal.WriteByte(ptr, (byte)'_');
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for (int i = 0; i < function.Length; i++)
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{
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Marshal.WriteByte(ptr, i + 1, (byte)function[i]);
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}
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Marshal.WriteByte(ptr, function.Length + 1, 0); // null-terminate
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IntPtr symbol = GetAddress(ptr);
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return symbol;
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}
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finally
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{
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Marshal.FreeHGlobal(ptr);
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}
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}
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public static IntPtr GetAddress(IntPtr function)
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{
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IntPtr symbol = IntPtr.Zero;
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if (NSIsSymbolNameDefined(function))
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{
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symbol = NSLookupAndBindSymbol(function);
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if (symbol != IntPtr.Zero)
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symbol = NSAddressOfSymbol(symbol);
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}
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return symbol;
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}
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public static IntPtr GetSymbol(IntPtr handle, string symbol)
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{
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return dlsym(handle, symbol);
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}
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public static IntPtr LoadLibrary(string fileName)
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{
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const int RTLD_NOW = 2;
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return dlopen(fileName, RTLD_NOW);
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}
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public static void FreeLibrary(IntPtr handle)
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{
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dlclose(handle);
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}
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}
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}
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