Patch #817329: Use SC_OPEN_MAX to determine MAXFD. Backported to 2.3.

diff --git a/Lib/popen2.py b/Lib/popen2.py
index e8fff06e0b603e59e65cb21219068ab284041941..ebb4ef652670a885e17c454a93a3d632b610d07f 100644 (file)
--- 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 = []