fdopen-tests: port to Tru64

* tests/test-fdopen.c (main): Don't invoke fdopen on a file
descriptors that is not open, as POSIX doesn't specify the
resulting behavior and the test does not work on Tru64.
Problem reported by Steven M. Schweda in:
http://lists.gnu.org/archive/html/bug-gnulib/2014-01/msg00079.html

1 files changed, 15 insertions, 22 deletions

diff --git a/tests/test-fdopen.c b/tests/test-fdopen.c
index 96a887fe2a..743511ecc6 100644
--- a/tests/test-fdopen.c
+++ b/tests/test-fdopen.c
@@ -29,28 +29,21 @@ SIGNATURE_CHECK (fdopen, FILE *, (int, const char *));
 int
 main (void)
 {
-  /* Test behaviour for invalid file descriptors.  */
-  {
-    FILE *fp;
-
-    errno = 0;
-    fp = fdopen (-1, "r");
-    if (fp == NULL)
-      ASSERT (errno == EBADF);
-    else
-      fclose (fp);
-  }
-  {
-    FILE *fp;
-
-    close (99);
-    errno = 0;
-    fp = fdopen (99, "r");
-    if (fp == NULL)
-      ASSERT (errno == EBADF);
-    else
-      fclose (fp);
-  }
+  /* Test behavior on failure.  POSIX makes it hard to check for
+     failure, since the behavior is not well-defined on invalid file
+     descriptors, so try fdopen 1000 times and if that's not enough to
+     fail due to EMFILE, so be it.  */
+
+  int i;
+  for (i = 0; i < 1000; i++)
+    {
+      errno = 0;
+      if (! fdopen (STDOUT_FILENO, "w"))
+        {
+          ASSERT (errno != 0);
+          break;
+        }
+    }
 
   return 0;
 }