Diagnose EBADF before EFAULT

tests/syscalls/syscalls.cc

 /*
  * Copyright 2008 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can
  * be found in the LICENSE file.
  */
 
 /*
  * NaCl tests for simple syscalls
  */
 
@@ skipping 219 matching lines @@
     return failed(testname, "read(fd, out_char, -1)");
   // bad address
   if (EFAULT != errno)
     return failed(testname, "EFAULT != errno");
 
   errno = 0;
   // fd not OK, buffer OK, count not OK
   ret_val = read(-1, out_char, -1);
   if (ret_val != -1)
     return failed(testname, "read(-1, out_char, -1)");
-  // bad address
-  if (EFAULT != errno)
-    return failed(testname, "EFAULT != errno");
+  // bad descriptor
+  if (EBADF != errno)
+    return failed(testname, "EBADF != errno");
 
   // fd OK, buffer OK, count 0
   ret_val = read(fd, out_char, 0);
   if (ret_val != 0)
     return failed(testname, "read(fd, out_char, 0)");
 
   // read 10, but only 3 are left
   ret_val = read(fd, out_char, 10);
   if (ret_val != 4)
     return failed(testname, "read(fd, out_char, 10)");
@@ skipping 171 matching lines @@
   passed = testSuite(argv[1]);
 
   if (passed) {
     printf("All tests PASSED\n");
     exit(0);
   } else {
     printf("One or more tests FAILED\n");
     exit(-1);
   }
 }