pythonnet/src/runtime/Native/LibraryLoader.cs at v3.0.1 · pythonnet/pythonnet · GitHub

History

168 lines (141 loc) · 5.16 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

using System;

using System.ComponentModel;

using System.Diagnostics;

using System.Linq;

using System.Runtime.InteropServices;

namespace Python.Runtime.Platform

{

interface ILibraryLoader

{

IntPtr Load(string? dllToLoad);

IntPtr GetFunction(IntPtr hModule, string procedureName);

void Free(IntPtr hModule);

}

static class LibraryLoader

{

static ILibraryLoader? _instance = null;

public static ILibraryLoader Instance

{

get

{

if (_instance == null)

{

if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))

_instance = new WindowsLoader();

else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))

_instance = new PosixLoader(LinuxLibDL.GetInstance());

else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))

_instance = new PosixLoader(new MacLibDL());

else

throw new PlatformNotSupportedException(

"This operating system is not supported"

);

}

return _instance;

}

class PosixLoader : ILibraryLoader

{

private readonly ILibDL libDL;

public PosixLoader(ILibDL libDL)

{

this.libDL = libDL ?? throw new ArgumentNullException(nameof(libDL));

}

public IntPtr Load(string? dllToLoad)

{

ClearError();

var res = libDL.dlopen(dllToLoad, libDL.RTLD_NOW | libDL.RTLD_GLOBAL);

if (res == IntPtr.Zero)

{

var err = GetError();

throw new DllNotFoundException($"Could not load {dllToLoad} with flags RTLD_NOW | RTLD_GLOBAL: {err}");

}

return res;

}

public void Free(IntPtr handle)

{

libDL.dlclose(handle);

}

public IntPtr GetFunction(IntPtr dllHandle, string name)

{

// look in the exe if dllHandle is NULL

if (dllHandle == IntPtr.Zero)

{

dllHandle = libDL.RTLD_DEFAULT;

}

ClearError();

IntPtr res = libDL.dlsym(dllHandle, name);

if (res == IntPtr.Zero)

{

var err = GetError();

throw new MissingMethodException($"Failed to load symbol {name}: {err}");

}

return res;

}

void ClearError()

{

libDL.dlerror();

}

string? GetError()

{

var res = libDL.dlerror();

if (res != IntPtr.Zero)

return Marshal.PtrToStringAnsi(res);

else

return null;

}

class WindowsLoader : ILibraryLoader

{

private const string NativeDll = "kernel32.dll";

public IntPtr Load(string? dllToLoad)

{

if (dllToLoad is null) return IntPtr.Zero;

var res = WindowsLoader.LoadLibrary(dllToLoad);

if (res == IntPtr.Zero)

throw new DllNotFoundException($"Could not load {dllToLoad}.", new Win32Exception());

return res;

}

public IntPtr GetFunction(IntPtr hModule, string procedureName)

{

if (hModule == IntPtr.Zero)

{

foreach(var module in GetAllModules())

{

var func = GetProcAddress(module, procedureName);

if (func != IntPtr.Zero) return func;

}

var res = WindowsLoader.GetProcAddress(hModule, procedureName);

if (res == IntPtr.Zero)

throw new MissingMethodException($"Failed to load symbol {procedureName}.", new Win32Exception());

return res;

}

public void Free(IntPtr hModule) => WindowsLoader.FreeLibrary(hModule);

static IntPtr[] GetAllModules()

{

using var self = Process.GetCurrentProcess();

uint bytes = 0;

var result = new IntPtr[0];

if (!EnumProcessModules(self.Handle, result, bytes, out var needsBytes))

throw new Win32Exception();

while (bytes < needsBytes)

{

bytes = needsBytes;

result = new IntPtr[bytes / IntPtr.Size];

if (!EnumProcessModules(self.Handle, result, bytes, out needsBytes))

throw new Win32Exception();

}

return result.Take((int)(needsBytes / IntPtr.Size)).ToArray();

}

[DllImport(NativeDll, SetLastError = true)]

static extern IntPtr LoadLibrary(string dllToLoad);

[DllImport(NativeDll, SetLastError = true)]

static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);

[DllImport(NativeDll)]

static extern bool FreeLibrary(IntPtr hModule);

[DllImport("Psapi.dll", SetLastError = true)]

static extern bool EnumProcessModules(IntPtr hProcess, [In, Out] IntPtr[] lphModule, uint lphModuleByteCount, out uint byteCountNeeded);

}

pythonnet/src/runtime/Native/LibraryLoader.cs at v3.0.1 · pythonnet/pythonnet · GitHub

Uh oh!

Expand file tree

Breadcrumbs

LibraryLoader.cs

Latest commit

History

Breadcrumbs

LibraryLoader.cs

File metadata and controls