pwrite tests: EBADF tests.

* tests/test-pwrite.c (main): Add tests for EBADF.

ChangeLog

@@ -1,5 +1,8 @@
 2011-09-20  Bruno Haible  <bruno@clisp.org>
 
+	pwrite tests: EBADF tests.
+	* tests/test-pwrite.c (main): Add tests for EBADF.
+
 	pread tests: EBADF tests.
 	* tests/test-pread.c (main): Add tests for EBADF.
 

tests/test-pwrite.c

@@ -76,5 +76,20 @@ main (void)
     ASSERT (close (fd) == 0);
     ASSERT (strcmp ("W1W3W5W7W9",buf) == 0);
   }
+
+  /* Test behaviour for invalid file descriptors.  */
+  {
+    char byte = 'x';
+    errno = 0;
+    ASSERT (pwrite (-1, &byte, 1, 0) == -1);
+    ASSERT (errno == EBADF);
+  }
+  {
+    char byte = 'x';
+    errno = 0;
+    ASSERT (pwrite (99, &byte, 1, 0) == -1);
+    ASSERT (errno == EBADF);
+  }
+
   return 0;
 }