From 821c8b9aacac0dde42d6d9a957ca7534ae3fedfc Mon Sep 17 00:00:00 2001
From: Corinna Vinschen <corinna@vinschen.de>
Date: Mon, 9 Jul 2012 12:13:16 +0000
Subject: 	* libc/stdio/fileno.c (fileno): Check if f is a valid stream. 
 If not, 	return -1 and set errno to EBADF per POSIX.

---
 newlib/libc/stdio/fileno.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'newlib/libc')

diff --git a/newlib/libc/stdio/fileno.c b/newlib/libc/stdio/fileno.c
index 818f1a1ca..be8f3d66a 100644
--- a/newlib/libc/stdio/fileno.c
+++ b/newlib/libc/stdio/fileno.c
@@ -47,6 +47,7 @@ Supporting OS subroutines required: none.
 
 #include <_ansi.h>
 #include <stdio.h>
+#include <errno.h>
 #include "local.h"
 
 int
@@ -56,7 +57,13 @@ _DEFUN(fileno, (f),
   int result;
   CHECK_INIT (_REENT, f);
   _newlib_flockfile_start (f);
-  result = __sfileno (f);
+  if (f->_flags)
+    result = __sfileno (f);
+  else
+    {
+      result = -1;
+      _REENT->_errno = EBADF;
+    }
   _newlib_flockfile_end (f);
   return result;
 }
-- 
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