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using System.Diagnostics.CodeAnalysis;
using System.Reflection;
namespace System.Runtime.InteropServices
{
/// <summary>
/// Marshalling helper methods that will likely live in S.R.IS.Marshal
/// when we integrate our APIs with dotnet/runtime.
/// </summary>
public static class MarshalEx
{
/// <summary>
/// Sets the handle of <paramref name="safeHandle"/> to the specified <paramref name="handle"/>.
/// </summary>
/// <param name="safeHandle"><see cref="SafeHandle"/> instance to update</param>
/// <param name="handle">Pre-existing handle</param>
public static void InitHandle(SafeHandle safeHandle, IntPtr handle)
{
typeof(SafeHandle).GetMethod("SetHandle", BindingFlags.NonPublic | BindingFlags.Instance)!.Invoke(safeHandle, new object[] { handle });
}
/// <summary>
/// Set the last platform invoke error on the thread
/// </summary>
public static void SetLastPInvokeError(int error)
{
MethodInfo? method = typeof(Marshal).GetMethod("SetLastWin32Error", BindingFlags.NonPublic | BindingFlags.Static);
if (method == null)
{
method = typeof(Marshal).GetMethod("SetLastPInvokeError", BindingFlags.Public | BindingFlags.Static);
}
method!.Invoke(null, new object[] { error });
}
/// <summary>
/// Get the last system error on the current thread (errno on Unix, GetLastError on Windows)
/// </summary>
public static unsafe int GetLastSystemError()
{
// Would be internal call that handles getting the last error for the thread using the PAL
if (OperatingSystem.IsWindows())
{
return Kernel32.GetLastError();
}
else if (OperatingSystem.IsMacOS())
{
return *libc.__error();
}
else if (OperatingSystem.IsLinux())
{
return *libc.__errno_location();
}
throw new NotImplementedException();
}
/// <summary>
/// Set the last system error on the current thread (errno on Unix, SetLastError on Windows)
/// </summary>
public static unsafe void SetLastSystemError(int error)
{
// Would be internal call that handles setting the last error for the thread using the PAL
if (OperatingSystem.IsWindows())
{
Kernel32.SetLastError(error);
}
else if (OperatingSystem.IsMacOS())
{
*libc.__error() = error;
}
else if (OperatingSystem.IsLinux())
{
*libc.__errno_location() = error;
}
else
{
throw new NotImplementedException();
}
}
private class Kernel32
{
[DllImport(nameof(Kernel32))]
public static extern void SetLastError(int error);
[DllImport(nameof(Kernel32))]
public static extern int GetLastError();
}
private class libc
{
[DllImport(nameof(libc))]
internal static unsafe extern int* __errno_location();
[DllImport(nameof(libc))]
internal static unsafe extern int* __error();
}
}
}
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