provided code

src/tests/userprog/write-bad-fd.c

@@ -0,0 +1,20 @@
+/* Tries to write to an invalid fd,
+   which must either fail silently or terminate the process with
+   exit code -1. */
+
+#include <limits.h>
+#include <syscall.h>
+#include "tests/main.h"
+
+void
+test_main (void) 
+{
+  char buf = 123;
+  write (0x01012342, &buf, 1);
+  write (7, &buf, 1);
+  write (2546, &buf, 1);
+  write (-5, &buf, 1);
+  write (-8192, &buf, 1);
+  write (INT_MIN + 1, &buf, 1);
+  write (INT_MAX - 1, &buf, 1);
+}