From: Guido van Rossum <guido@python.org>
Date: Mon, 2 Jun 2003 19:12:01 +0000 (+0000)
Subject: When a previous call to poll() has already seen the process status,
X-Git-Tag: v2.3c1~540
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=3800ef7ae2391e3bf6573b41fc6ac513cd3dde82;p=python

When a previous call to poll() has already seen the process status,
wait() should not call waitpid() again.

Should be backported to 2.2.4.
---

diff --git a/Lib/popen2.py b/Lib/popen2.py
index d6ff002a20..8a176412f3 100644
--- a/Lib/popen2.py
+++ b/Lib/popen2.py
@@ -83,10 +83,11 @@ class Popen3:
 
     def wait(self):
         """Wait for and return the exit status of the child process."""
-        pid, sts = os.waitpid(self.pid, 0)
-        if pid == self.pid:
-            self.sts = sts
-            _active.remove(self)
+        if self.sts < 0:
+            pid, sts = os.waitpid(self.pid, 0)
+            if pid == self.pid:
+                self.sts = sts
+                _active.remove(self)
         return self.sts