From a39483efc0967d2b4bf6fb883a2639db3fcdb9d1 Mon Sep 17 00:00:00 2001
From: Matt Wala <wala1@illinois.edu>
Date: Wed, 15 Feb 2017 20:16:54 -0600
Subject: [PATCH] maxima.shutdown(): Fix OS X interop by turning off echo
 before sending quit command (closes #3).

---
 pymbolic/interop/maxima.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pymbolic/interop/maxima.py b/pymbolic/interop/maxima.py
index 77f1aab..6021486 100644
--- a/pymbolic/interop/maxima.py
+++ b/pymbolic/interop/maxima.py
@@ -326,6 +326,8 @@ class MaximaKernel:
         self._initialize()
 
     def shutdown(self):
+        # tty echo appears to cause waitpid() to block on OS X; turn it off.
+        self.child.setecho(False)
         self._sendline("quit();")
         self.child.wait()
 
-- 
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