From f563c8bbac748e7ca9a1127c67831902bccaee02 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20v=2E=20L=C3=B6wis?= <martin@v.loewis.de>
Date: Mon, 6 Oct 2003 21:34:33 +0000
Subject: [PATCH] Patch #817329: Use SC_OPEN_MAX to determine MAXFD. Backported
 to 2.3.

---
 Lib/popen2.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Lib/popen2.py b/Lib/popen2.py
index e8fff06e0b6..ebb4ef65267 100644
--- a/Lib/popen2.py
+++ b/Lib/popen2.py
@@ -11,7 +11,10 @@ import sys
 
 __all__ = ["popen2", "popen3", "popen4"]
 
-MAXFD = 256     # Max number of file descriptors (os.getdtablesize()???)
+try:
+    MAXFD = os.sysconf('SC_OPEN_MAX')
+except (AttributeError, ValueError):
+    MAXFD = 256
 
 _active = []