Add log sink C-interface

1 files changed, 26 insertions, 0 deletions

diff --git a/windows/shared/logsink.h b/windows/shared/logsink.h
new file mode 100644
index 0000000000..16a84d4def
--- /dev/null
+++ b/windows/shared/logsink.h
@@ -0,0 +1,26 @@
+#pragma once
+
+//
+// This file is shared between DLL modules to help define their public interface.
+// It should always be C-compatible.
+//
+
+enum MULLVAD_LOG_SINK_SEVERITY
+{
+	MULLVAD_LOG_SINK_SEVERITY_ERROR = 0,
+	MULLVAD_LOG_SINK_SEVERITY_WARNING,
+	MULLVAD_LOG_SINK_SEVERITY_INFO,
+	MULLVAD_LOG_SINK_SEVERITY_TRACE
+};
+
+//
+// The log sink is registered with a DLL during e.g. initialization.
+// It may later be activated as a direct or indirect result of calling into the DLL.
+//
+// The parameters are:
+//
+// `MULLVAD_LOG_SINK_SEVERITY` - Severity of the message.
+// `const char *` - The message itself.
+// `void *` - The sink context that was registered along with the sink.
+//
+typedef void (__stdcall *MullvadLogSink)(MULLVAD_LOG_SINK_SEVERITY, const char *, void *);