diff --git a/src/libthread/tspawn.c b/src/libthread/tspawn.c
new file mode 100644
index 0000000..97962c5
--- /dev/null
+++ b/src/libthread/tspawn.c
@@ -0,0 +1,41 @@
+#include <lib9.h>
+#include <thread.h>
+extern int _threaddebuglevel;
+
+void
+doexec(void *v)
+{
+	int fd[3];
+	char **argv = v;
+
+	print("exec failed: %r\n");
+	sendp(threadwaitchan(), nil);
+	threadexits(nil);
+}
+
+void
+threadmain(int argc, char **argv)
+{
+	int fd[3];
+	Channel *c;
+	Waitmsg *w;
+
+	ARGBEGIN{
+	case 'D':
+		_threaddebuglevel = ~0;
+		break;
+	}ARGEND
+
+	c = threadwaitchan();
+	fd[0] = dup(0, -1);
+	fd[1] = dup(1, -1);
+	fd[2] = dup(2, -1);
+	if(threadspawn(fd, argv[0], argv) < 0)
+		sysfatal("threadspawn: %r");
+	w = recvp(c);
+	if(w == nil)
+		print("exec/recvp failed: %r\n");
+	else
+		print("%d %lud %lud %lud %s\n", w->pid, w->time[0], w->time[1], w->time[2], w->msg);
+	threadexits(nil);
+}