Index: Lib/subprocess.py
===================================================================
--- Lib/subprocess.py	(revision 58491)
+++ Lib/subprocess.py	(working copy)
@@ -965,15 +965,9 @@
 
 
         def _close_fds(self, but):
-            for i in xrange(3, MAXFD):
-                if i == but:
-                    continue
-                try:
-                    os.close(i)
-                except:
-                    pass
+            os.closerange(3, but)
+            os.closerange(but + 1, MAXFD)
 
-
         def _execute_child(self, args, executable, preexec_fn, close_fds,
                            cwd, env, universal_newlines,
                            startupinfo, creationflags, shell,
Index: Modules/posixmodule.c
===================================================================
--- Modules/posixmodule.c	(revision 58491)
+++ Modules/posixmodule.c	(working copy)
@@ -6079,6 +6079,25 @@
 }
 
 
+PyDoc_STRVAR(posix_closerange__doc__, 
+"closerange(fd_low, fd_high)\n\n\
+Closes all file descriptors in [fd_low, fd_high), ignoring errors.");
+
+static PyObject *
+posix_closerange(PyObject *self, PyObject *args)
+{
+        int fd_from, fd_to, i;
+	if (!PyArg_ParseTuple(args, "ii:closerange", &fd_from, &fd_to))
+		return NULL;
+	Py_BEGIN_ALLOW_THREADS
+	for (i=fd_from; i < fd_to; i++)
+		close(i);
+	Py_END_ALLOW_THREADS
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+
 PyDoc_STRVAR(posix_dup__doc__,
 "dup(fd) -> fd2\n\n\
 Return a duplicate of a file descriptor.");
@@ -8365,6 +8384,7 @@
 #endif /* HAVE_TCSETPGRP */
 	{"open",	posix_open, METH_VARARGS, posix_open__doc__},
 	{"close",	posix_close, METH_VARARGS, posix_close__doc__},
+	{"closerange",	posix_closerange, METH_VARARGS, posix_closerange__doc__},
 	{"dup",		posix_dup, METH_VARARGS, posix_dup__doc__},
 	{"dup2",	posix_dup2, METH_VARARGS, posix_dup2__doc__},
 	{"lseek",	posix_lseek, METH_VARARGS, posix_lseek__doc__},