From 862d56d5f910b4b103f66ea70c44baff3c375cbe Mon Sep 17 00:00:00 2001
From: usa <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 5 Dec 2008 09:14:12 +0000
Subject: [PATCH] 	* win32/win32.c (rb_w32_read, rb_w32_write,
 rb_w32_isatty): check 	  whether fd is valid.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@20540 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog     | 4 ++++
 win32/win32.c | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 8a59bf9cca..72234c4cc4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Dec  5 18:13:39 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* win32/win32.c (rb_w32_isatty): check whether fd is valid.
+
 Fri Dec  5 12:49:24 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* win32/win32.c (waitpid): fix bug of checking child slot.
diff --git a/win32/win32.c b/win32/win32.c
index 9d46bf0d6d..de90cfb144 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -4091,6 +4091,10 @@ rb_w32_unlink(const char *path)
 int
 rb_w32_isatty(int fd)
 {
+    // validate fd by using _get_osfhandle() because we cannot access _nhandle
+    if (_get_osfhandle(fd) == -1) {
+	return 0;
+    }
     if (!(_osfile(fd) & FOPEN)) {
 	errno = EBADF;
 	return 0;