diff --git a/source/eventcore/driver.d b/source/eventcore/driver.d
index 9a2d65f..99a38ef 100644
--- a/source/eventcore/driver.d
+++ b/source/eventcore/driver.d
@@ -119,7 +119,7 @@ interface EventDriverDNS {
 interface EventDriverFiles {
 @safe: /*@nogc:*/ nothrow:
 	FileFD open(string path, FileOpenMode mode);
-	FileFD createTemp();
+	FileFD adopt(int system_file_handle);
 	void close(FileFD file);
 
 	ulong getSize(FileFD file);
diff --git a/source/eventcore/drivers/threadedfile.d b/source/eventcore/drivers/threadedfile.d
index b0bf2bf..ab70e42 100644
--- a/source/eventcore/drivers/threadedfile.d
+++ b/source/eventcore/drivers/threadedfile.d
@@ -142,12 +142,17 @@ final class ThreadedFileEventDriver(Events : EventDriverEvents) : EventDriverFil
 		}
 		auto fd = () @trusted { return .open(path.toStringz(), flags, amode); } ();
 		if (fd < 0) return FileFD.init;
-		return FileFD(fd);
+		return adopt(fd);
 	}
 
-	final override FileFD createTemp()
+	final override FileFD adopt(int system_file_handle)
 	{
-		assert(false, "TODO!");
+		auto flags = () @trusted { return fcntl(system_file_handle, F_GETFD); } ();
+		if (flags == -1) return FileFD.invalid;
+		if (m_files[system_file_handle].refCount > 0) return FileFD.invalid;
+		m_files[system_file_handle] = FileInfo.init;
+		m_files[system_file_handle].refCount = 1;
+		return FileFD(system_file_handle);
 	}
 
 	void close(FileFD file)