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217 lines (179 loc) · 6.69 KB
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using System;
using System.ComponentModel;
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 LinuxLoader();
else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
_instance = new DarwinLoader();
else
throw new PlatformNotSupportedException(
"This operating system is not supported"
);
}
return _instance;
}
}
}
class LinuxLoader : ILibraryLoader
{
private static int RTLD_NOW = 0x2;
private static int RTLD_GLOBAL = 0x100;
private static IntPtr RTLD_DEFAULT = IntPtr.Zero;
private const string NativeDll = "libdl.so";
public IntPtr Load(string dllToLoad)
{
var filename = $"lib{dllToLoad}.so";
ClearError();
var res = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
if (res == IntPtr.Zero)
{
var err = GetError();
throw new DllNotFoundException($"Could not load {filename} with flags RTLD_NOW | RTLD_GLOBAL: {err}");
}
return res;
}
public void Free(IntPtr handle)
{
dlclose(handle);
}
public IntPtr GetFunction(IntPtr dllHandle, string name)
{
// look in the exe if dllHandle is NULL
if (dllHandle == IntPtr.Zero)
{
dllHandle = RTLD_DEFAULT;
}
ClearError();
IntPtr res = dlsym(dllHandle, name);
if (res == IntPtr.Zero)
{
var err = GetError();
throw new MissingMethodException($"Failed to load symbol {name}: {err}");
}
return res;
}
void ClearError()
{
dlerror();
}
string GetError()
{
var res = dlerror();
if (res != IntPtr.Zero)
return Marshal.PtrToStringAnsi(res);
else
return null;
}
[DllImport(NativeDll, CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
public static extern IntPtr dlopen(string fileName, int flags);
[DllImport(NativeDll, CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
private static extern IntPtr dlsym(IntPtr handle, string symbol);
[DllImport(NativeDll, CallingConvention = CallingConvention.Cdecl)]
private static extern int dlclose(IntPtr handle);
[DllImport(NativeDll, CallingConvention = CallingConvention.Cdecl)]
private static extern IntPtr dlerror();
}
class DarwinLoader : ILibraryLoader
{
private static int RTLD_NOW = 0x2;
private static int RTLD_GLOBAL = 0x8;
private const string NativeDll = "/usr/lib/libSystem.dylib";
private static IntPtr RTLD_DEFAULT = new IntPtr(-2);
public IntPtr Load(string dllToLoad)
{
var filename = $"lib{dllToLoad}.dylib";
ClearError();
var res = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
if (res == IntPtr.Zero)
{
var err = GetError();
throw new DllNotFoundException($"Could not load {filename} with flags RTLD_NOW | RTLD_GLOBAL: {err}");
}
return res;
}
public void Free(IntPtr handle)
{
dlclose(handle);
}
public IntPtr GetFunction(IntPtr dllHandle, string name)
{
// look in the exe if dllHandle is NULL
if (dllHandle == IntPtr.Zero)
{
dllHandle = RTLD_DEFAULT;
}
ClearError();
IntPtr res = dlsym(dllHandle, name);
if (res == IntPtr.Zero)
{
var err = GetError();
throw new MissingMethodException($"Failed to load symbol {name}: {err}");
}
return res;
}
void ClearError()
{
dlerror();
}
string GetError()
{
var res = dlerror();
if (res != IntPtr.Zero)
return Marshal.PtrToStringAnsi(res);
else
return null;
}
[DllImport(NativeDll, CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
public static extern IntPtr dlopen(String fileName, int flags);
[DllImport(NativeDll, CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
private static extern IntPtr dlsym(IntPtr handle, String symbol);
[DllImport(NativeDll, CallingConvention = CallingConvention.Cdecl)]
private static extern int dlclose(IntPtr handle);
[DllImport(NativeDll, CallingConvention = CallingConvention.Cdecl)]
private static extern IntPtr dlerror();
}
class WindowsLoader : ILibraryLoader
{
private const string NativeDll = "kernel32.dll";
public IntPtr Load(string dllToLoad)
{
var res = WindowsLoader.LoadLibrary(dllToLoad);
if (res == IntPtr.Zero)
throw new DllNotFoundException($"Could not load {dllToLoad}", new Win32Exception());
return res;
}
public IntPtr GetFunction(IntPtr hModule, string procedureName)
{
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);
[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);
}
}