diff -r 98475e024344 Lib/subprocess.py
--- a/Lib/subprocess.py	Fri May 30 16:28:00 2014 -0400
+++ b/Lib/subprocess.py	Fri May 30 22:06:25 2014 -0700
@@ -1334,16 +1334,42 @@
                     c2pread, c2pwrite,
                     errread, errwrite)
 
+        _fds_dir = None
+
+        if sys.platform.startswith("aix"):
+            pass
+        elif sys.platform.startswith("atheos"):
+            pass
+        elif sys.platform.startswith("beos"):
+            pass
+        elif sys.platform.startswith("darwin"):
+            pass
+        elif sys.platform.startswith("freebsd"):
+            _fds_dir = "/dev/fd"
+        elif sys.platform.startswith("irix"):
+            pass
+        elif sys.platform.startswith("linux"):
+            _fds_dir = "/proc/self/fd"
+        elif sys.platform.startswith("mac"):
+            pass
+        elif sys.platform.startswith("netbsd"):
+            _fds_dir = "/dev/fd"
+        elif sys.platform.startswith("next"):
+            pass
+        elif sys.platform.startswith("os2emx"):
+            pass
+        elif sys.platform.startswith("riscos"):
+            pass
+        elif sys.platform.startswith("sunos"):
+            pass
+        elif sys.platform.startswith("unixware"):
+            pass
 
         def _close_fds(self, fds_to_keep):
-            start_fd = 3
-            for fd in sorted(fds_to_keep):
-                if fd >= start_fd:
-                    os.closerange(start_fd, fd)
-                    start_fd = fd + 1
-            if start_fd <= MAXFD:
-                os.closerange(start_fd, MAXFD)
-
+            for fdstr in os.listdir(_fds_dir):
+                fd = int(fdstr)
+                if fd >= 3 and not(fd in fds_to_keep):
+                    os.close(fd)
 
         def _execute_child(self, args, executable, preexec_fn, close_fds,
                            pass_fds, cwd, env,