my solution to lab5

lab/user/spawnfaultio.c

@@ -0,0 +1,10 @@
+#include <inc/lib.h>
+
+void
+umain(int argc, char **argv)
+{
+	int r;
+	cprintf("i am parent environment %08x\n", thisenv->env_id);
+	if ((r = spawnl("faultio", "faultio", 0)) < 0)
+		panic("spawn(faultio) failed: %e", r);
+}