public static void LinuxX64Callback(string format, IntPtr args)
{
// The args pointer cannot be reused between two calls. We need to make a copy of the underlying structure.
var listStructure = Marshal.PtrToStructure <VaListLinuxX64>(args);
int byteLength = 0;
UseStructurePointer(listStructure, listPointer =>
{
byteLength = LinuxInterop.vsnprintf(IntPtr.Zero, UIntPtr.Zero, format, listPointer) + 1;
});
var utf8Buffer = Marshal.AllocHGlobal(byteLength);
try
{
UseStructurePointer(listStructure, listPointer =>
{
LinuxInterop.vsprintf(utf8Buffer, format, listPointer);
Console.WriteLine(Utf8ToString(utf8Buffer));
});
}
finally
{
Marshal.FreeHGlobal(utf8Buffer);
}
}
public static void RunUnix()
{
string arch;
NativeLibrary.Callback callback;
// Detect the process architecture
switch (RuntimeInformation.ProcessArchitecture)
{
case Architecture.X86:
arch = "x86";
callback = LinuxX86Callback;
break;
case Architecture.X64:
arch = "x64";
callback = LinuxX64Callback;
break;
default:
throw new PlatformNotSupportedException("Only x86 and x64 are supported at the moment");
}
Console.WriteLine(arch);
// Load the correct library
var nativeExtension = RuntimeInformation.IsOSPlatform(OSPlatform.Linux) ? "so " : "dylib";
var handle = LinuxInterop.dlopen(Path.Combine(Environment.CurrentDirectory, "nativeLibrary", "build", $"libnativeLibrary.{arch}.{nativeExtension}"), LinuxInterop.RTLD_LAZY);
if (handle == IntPtr.Zero)
{
Console.Error.WriteLine("Failed to load native library");
throw new Exception(LinuxInterop.dlerror());
}
try
{
// Locate the "triggerCallback" function. This function just calls the callback with some parameters.
var procAddress = LinuxInterop.dlsym(handle, "triggerCallback");
if (procAddress == IntPtr.Zero)
{
Console.Error.WriteLine("Failed to locate the triggerCallback function.");
throw new Exception(LinuxInterop.dlerror());
}
var triggerCallback = Marshal.GetDelegateForFunctionPointer <NativeLibrary.TriggerCallback>(procAddress);
triggerCallback(callback);
}
finally
{
LinuxInterop.dlclose(handle);
}
}
public static void LinuxX86Callback(string format, IntPtr args)
{
// This implementation is pretty straightforward. The IntPtr can be passed to the functions and can be reused.
int byteLength = LinuxInterop.vsnprintf(IntPtr.Zero, UIntPtr.Zero, format, args) + 1;
var utf8Buffer = Marshal.AllocHGlobal(byteLength);
try
{
LinuxInterop.vsprintf(utf8Buffer, format, args);
Console.WriteLine(Utf8ToString(utf8Buffer));
}
finally
{
Marshal.FreeHGlobal(utf8Buffer);
}
}