new test program

src/libthread/test/tdaemon.c

diff --git a/src/libthread/test/tdaemon.c b/src/libthread/test/tdaemon.c
new file mode 100644
index 0000000..5ac9768
--- /dev/null
+++ b/src/libthread/test/tdaemon.c
@@ -0,0 +1,11 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+
+void
+threadmain(int argc, char **argv)
+{
+	threaddaemonize();
+	sleep(5*1000);
+	print("still running\n");
+}